Geometry and Measures
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2 Geometry and Measures
3 Midpoint of a line segment What are the coordinates of the midpoint of this line? Add the coordinates Halve them (6, 7) (2, 3) (8, 10) (4,5) + ½ (2,3) (6,7)
4 Area of 2D shapes Triangle Rectangle Parallelogram Trapezium a l h h h b w A = length x width b A = base x height b h a b b A = ½ bh h A = h (a + b) 2
5 Area of compound shapes Split the shape in to two (or more) smaller shapes Find any missing lengths Find the area of each shape Add them up Remember the units
6 Area of a trapezium Add the parallel sides Multiply by the height Halve height height
7 Real-life area problems The diagram shows the plan of a swimming pool. Harry wants to tile the bottom of the swimming pool. Each pack of tiles cover an area of 7m². Each pack of tiles costs 6.99 How much will it cost Harry to tile the bottom of the pool? 2m Area of A = 2m x 5m = 10m 2 Area of B = 8m x 6m = 48m 2 11m A B 8m 5m 6m Total area of the floor = 10m m 2 1 pack covers 7m 2 2 packs cover 14m 2 4 packs cover 28m 2 8 packs cover 56m 2 9 packs cover 63m 2 9 packs are needed = 58m 2 Cost of tiles = 9 x 6.99 = 62.91
8 Surface area of a prism Count how many faces there are List them Find the area of each face Add up all of the areas Remember the units
9 Surface area of a prism Find the surface area of the cuboid 6 faces Front Back Top Bottom Side Side 8 x 5 = 40cm 2 8 x 5 = 40cm 2 8 x 3 = 24cm 2 8 x 3 = 24cm 2 5 x 3 = 15cm 2 5 x 3 = 15cm 2 Total surface area = 158cm 2
10 Surface area of a prism Find the surface area of the triangular prism 5 faces 5 Front Back Bottom 3 x 5 = 15cm 2 4 x 3 = 12cm 2 3 x 3 = 9cm 2 Total surface area = 48cm 2 Side = 6cm2 Side = 6cm2
11 Surface area of a prism Find the surface area of the prism 8 faces Front 64cm 2 Total surface area = 48cm 2 Back 64cm 2 Bottom 12 x 10 = 120cm 2 Top 1 8 x 10 = 80cm 2 Top 2 4 x 10 = 40cm 2 8 cm 4 cm Area = 48cm 2 Area = 16cm 2 4 cm Side 1 Side 2 Side 3 6 x 10 = 60cm 2 2 x 10 = 20cm 2 4 x 10 = 40cm 2
12 Parts of a circle
13 Area and circumference of circles Work out the area of a circle with a radius of 7m. Give your answer in terms of π. Work out the area of a circle with a radius of 12cm. Give your answer in terms of π. A = πr 2 = π x 7 2 = π x 49 = 49π m 2 r = 12cm C = πd = π x 24 = 24π cm d = 24cm
14 Area of a sector Find the area of the sector in terms of π Area of sector = x 360 A = π 62 π radius2 = 1 9 π 36 = 36π 9 = 4π cm 2
15 Length of an arc Find the perimeter of the sector in terms of π Length of arc = x 360 L = π r 2 π 18 = π 18 = 36π 9 = 4π cm Perimeter of sector = 4π = 4π + 36
16 Area of a sector Find the shaded area correct to 2 decimal places. Area of large sector = x π x 92 = cm 2 Find the area of the large sector Find the area of the small sector Subtract to get the shaded area Area of small sector = x π x 52 = cm 2 Shaded area = cm cm 2 = cm 2 = 17.10cm 2 (2dp)
17 Area of non-right angled triangles Use Area = 0.5ab sin C Area = 0.5 x length 1 x length 2 x sine of the included angle HIGHER ONLY
18 Area of non-right angled triangles A = 0.5 x 5 x 5 x sin 60 5cm cm = cm 60 0 = 23.8 cm 2 (1dp) HIGHER ONLY
19 Area of non-right angled triangles Area of triangle 1 = 0.5 x 80 x 80 x sin 71 = m Area of triangle 2 = 0.5 x 70 x 50 x sin 80 = m 2 Area of quadrilateral = = 4749 m 2 (nearest m 2 ) HIGHER ONLY
20 Area of segments Find the area of the segment. Give your answer to 3 significant figures. Area of segment = Area of sector Area of triangle Area of sector = π 62 = Area of triangle = sin 25 0 = Area of segment = = = cm 2 (3 sf) HIGHER ONLY
21 Volume of prism Volume of prism = area of cross section x length
22 Volume of prism Find the volume of the triangular prism below. Volume prism = Area of cross-section x Length Area of cross-section = V = 12 x 12 = 144cm 3 = 12cm2
23 Volume of prism Find the volume of the prism below. Volume of prism = Area of cross-section x Length Area of cross section: = 16 4 x 16 = = 32cm 2 V = 32 x 5 = 160cm 3
24 Volume of prism Find the volume of the prism Volume of prism = Area of cross section x Length = 64cm 2 x 10cm = 640cm 2 8 cm A 4 cm B 4 cm Area of A = 48 cm 2 Area of B = 16cm 2 Area of cross section = 64cm 2
25 Volume of a cylinder Calculate the volume of the cylinder. Leave your answer in terms of p 6 cm 8 cm V = pr 2 h V = p x 6 2 x 8 = 288pcm 3
26 Volume of a sphere Find the volume of the hemisphere in terms of π 3 cm Volume of sphere = 4 π r3 3 Volume of hemisphere = 2 π r3 3 V = 2 3 π 33 = 2 3 π 27 = 18πcm 3
27 Surface area of a cone Find the total surface area of the cone. Give your answer to 1 decimal place. Curved surface area = πrl l 2 = = = 25 l = 5 cm
28 Surface area of a cone 5 cm Total surface area = curved surface area + area of base = πrl + πr 2 = (π x 3 x 5) + (π x 3 2 ) = = 75.4 cm 2 (1 dp) HIGHER ONLY
29 Volume problems The shape below is composed of a solid metal cylinder capped with a solid metal hemi-sphere as shown. Find the volume of the shape. (to 3 sig fig) Volume of hemi-sphere = 4 3 πr3 2 = 2 3 pr3 = 2 3 x p x 33 6 m 4m = m 3 Volume of cylinder = pr 2 h = p x 3 2 x 4 = m 3 Total volume = m 3 = 170 m 3
30 Volume problems 12 cm A fuel pod consists of cylinder with a hemi-spherical base and a conical top as shown in the diagram. Calculate the surface area of the pod. (answer to 2 sig fig) Curved surface area of cone = prl = p x 5 x 12 = cm 2 40 cm Curved surface area of cylinder = 2prh = 2 x p x 5 x 40 = cm 2 10 cm Surface area of hemi-sphere = 2pr 2 = 2 x p x 5 2 = cm 2 Total surface area = cm 2 = 1600 cm 2
31 Volume of a pyramid Volume of pyramid = 1 / 3 x area of base x h Area of base = 8 x 8 = 64 cm 2 Volume of pyramid = 1 / 3 x 64 x 9 = 192 cm 3
32 Volume of a frustum Volume of frustum = Volume of big cone Volume of small cone HIGHER ONLY
33 Volume of a frustum A cone of height 6cm and base radius of 8cm is cut to form a smaller cone and a frustum. Find the volume of the frustum. Give your answer to 3 significant figures. Volume of frustum = Volume of big cone Volume of small cone Volume of big cone = 1 x π x 82 x 6 3 = cm 3 Volume of small cone = 1 x π x 3 42 x 3 = cm 3 Volume of frustum = = cm 3 = 352 cm 3 (3sf) HIGHER ONLY
34 Density, mass and volume MOVE DOWN VERA
35 Density, mass and volume A cuboid has dimensions of 2 m x 90 cm x 140 cm. It has a density of 0.8kg/m 3. Find the mass of the cuboid. Mass = Density x Volume Volume of cuboid = 2.52 m 3 Mass = 0.8 x 2.52 Mass = kg 90cm 2m 140cm
36 Plans and elevations Front The plan of a 3D shape is the two dimensional view that you see from above i.e. the bird s eye view. The front elevation is the two dimensional view of the 3D shape from the front. The side elevation is the two dimensional view of the 3D shape from the side.
37 Alternate angles Z shape Alternate angles are equal
38 Corresponding angles F shape Same place but further up or down (or left or right) Corresponding angles are equal
39 Angles on parallel lines Angle FBC = 70 0 Alternate angles are equal. Angle BFC = 70 0 Base angles in an isosceles triangle are equal. x = 40 0 Angles in a triangle add up to
40 Angles of regular polygons Exterior angle = no of sides Interior angle + exterior angle = Interior angle = exterior angle No. of sides = exterior angle Sum of interior angle of any polygon = (number of sides 2) x 180 0
41 Angles of polygons Sum of interior angles = (5 2) x = = x = = 149 0
42 Angles of regular polygons The diagram shows a regular polygon with 8 sides. Work out the value of x. Interior angle of octagon: Exterior angle = = 45 0 Interior angle = = The triangle is isosceles = 45 0 x = =
43 Interior angle of decagon: Exterior angle = = 36 0 Interior angle = = The triangle is isosceles = = 18 0 x = = 108 0
44 Angles of regular polygons Angle DCF Interior angle of a regular pentagon Exterior angle of regular pentagon = = 72 0 Interior angle of regular pentagon = = DCF = =
45 Bearings A bearing is used to represent the direction of one point relative to another point. Bearings are a way of giving directions more accurately. 1. Bearings are always measured from North, which is (or ). 2. They are always measured clockwise. 3. They must have three figures. So East is 090 0, South is and West is
46 Bearings x C Bearings must be written as 3 figures 066
47 Bearings Find the bearing of B from A 360 o = 330 0
48 Bearings
49 Constructing a perpendicular bisector 1. Draw a line connecting the points if their isn t one there. 2. Place compass at A, set over halfway and draw 2 arcs. 3. Place compass at B, with same distance set and draw 2 arcs to intersect first two. 4. Draw the perpendicular bisector through the points of intersection. A B
50 Constructing an angle bisector 1. Place compass at A, and draw an arc crossing AB and AC. 2. Place compass at intersections and (with the same distance set) draw 2 arcs that intersect. B 3. Draw the angle bisector from A through the point of intersection. A C Angle
51 Construct a triangle of sides 8 cm, 7cm and 6 cm. 1. Draw a line 8cm long and use it as the base of triangle. 2. Set compass to 7 cm, place at A and draw an arc. 3. Set compass to 6 cm, place at B and draw an arc to intersect the first one. 4. Draw straight lines from A and B to point of intersection. Tri 3 sides 7 cm 6 cm A 8 cm B
52 Constructing an equilateral triangle 1. Draw base line AB of any length. 2. Place compass at A, set to distance AB and draw arc. 3. Place compass at B, with same distance set, draw an arc to intersect first one. 4. Join intersection point to A and B to form an equilateral triangle. Eq Tri A B
53 Loci Two lines = angle bisector
54 Reflection Draw the line x = 1 Reflect the shape Remember to label it
55 Rotation Rotate the triangle, 90 0 clockwise, about the centre of rotation. centre of rotation
56 Rotate the triangle, 90 0 clockwise, about the centre of rotation.
57 Rotate the triangle, 90 0 clockwise, about the centre of rotation.
58 Rotate the triangle, 90 0 clockwise, about the centre of rotation.
59 Rotate the triangle, 90 0 clockwise, about the centre of rotation.
60 Rotate the triangle, 90 0 clockwise, about the centre of rotation.
61 Rotate the triangle, 90 0 clockwise, about the centre of rotation.
62 Rotate the triangle, 90 0 clockwise, about the centre of rotation.
63 Rotate the triangle, 90 0 clockwise, about the centre of rotation.
64 Rotate the triangle, 90 0 clockwise, about the centre of rotation.
65 Rotate the flag about the centre of rotation
66 Enlargement from a centre Enlarge the green shape by scale factor 2 using the dot as the centre of enlargement When enlarging from a centre the image must be twice as big AND twice as far away from the centre
67 Enlargement from a centre Enlarge shape P by a scale factor of 2 from the origin. Origin = (0, 0) The new shape needs to be twice as big and twice as far away from the centre.
68 Translation y Translate Hexagon A by the vector left 4 down 4 down B A 3 left æ çç è ö ø Label the image B x
69 Describing a single transformation
70 Translation
71 Enlargement To find the centre of enlargement draw lines through corresponding points on the image and object and find where they cross
72 Rotation
73 Reflection
74 Similar shapes The two rectangles below are similar. Find x. Scale factor = enlarged length original length = 30 6 x = 5 x = 16 x 5 = 80 cm
75 Similar shapes Find DE C C 8cm 10cm D E B 12cm A STEP 1 Draw out the two triangles separately. STEP 2 STEP 3 Find the scale factor. Find the missing side. Scale factor = 10 8 = 1.25 DE = = 9.6cm
76 The relationship between the lengths, areas and volumes of similar shapes If the scale factor of the lengths is k, then: the scale factors of the areas will be k 2 (i.e. the areas will be k 2 times as big) the scale factor of the volumes will be k 3 (i.e. the volumes will be k 3 times as big) HIGHER ONLY
77 Similar shapes - area Scale factor of lengths = 18 6 = 3 Scale factor of areas = 3 2 = 9 Area of triangle A = 36 9 = 4cm 2 HIGHER ONLY
78 Similar shapes - volumes Scale factor of volumes = = Scale factor of lengths = N = 1.5 Length of cylinder B = 6 x 1.5 = 9cm HIGHER ONLY
79 Congruent shapes If two or more shapes are described as 'congruent', it means that they are identical in shape and size. Shapes can be congruent even if one of the shapes has been reflected or rotated. Reflect
80 Congruent triangles Consequently, when two or more triangles are described as congruent, it means that they have exactly the same three sides and exactly the same three angles. These triangles can be congruent even if one of them has been reflected or rotated. For example, the triangles below are congruent because they have exactly the same sides and angles: HIGHER ONLY
81 Congruent triangles However, it is important to note that triangles can have exactly the same angles but not be congruent. Triangles can only be congruent if all of their sides are exactly the same length. Their angles may be the same also but it is not necessary. For example, the triangles displayed below have exactly the same angles but are not congruent because their sides are different lengths: HIGHER ONLY
82 Proving that triangles are congruent There are four ways of proving that two triangles are congruent: SSS (Side-Side-Side) SAS (Side-Angle-Side) AAS (Angle-Angle-Side) RHS (Right Angle-Hypotenuse-Side) HIGHER ONLY
83 Proving that triangles are congruent SSS (Side Side Side) Often referred to as the SSS rule, the Side-Side-Side rule can be used to prove two triangles are congruent. If the three sides of the first triangle are equal to the three sides of the second triangle, then the triangles are congruent to one another. You can mark these SSS triangles in the following manner: HIGHER ONLY
84 Proving that triangles are congruent SAS (Side Angle Side) Often referred to as the SAS rule, the Side-Angle-Side rule can be used to prove two triangles are congruent. If two sides of the first triangle are equal to two sides of the second triangle, and the included angle is equal, then the two triangles are congruent. You can mark these SAS triangles in the following manner: HIGHER ONLY
85 Proving that triangles are congruent AAS (Angle Angle Side) Often referred to as the AAS rule, the Angle-Angle-Side rule can be used to prove two triangles are congruent. If two angles of the first triangle are equal to two angles of the second triangle, and one similarly located side is equal, then the two triangles are congruent. You can mark these AAS triangles in the following manner: HIGHER ONLY
86 Proving that triangles are congruent RHS (Right Angle Hypotenuse - Side) Often referred to as the RHS rule, the Right Angle-Hypotenuse-Side rule can be used to prove two triangles are congruent. If the hypotenuse and one other side of the first right-angled triangle are equal to the hypotenuse and corresponding side of the second right-angled triangle, then the two triangles are congruent. You can mark these RHS triangles in the following manner: HIGHER ONLY
87 Angle AEB = Angle DEC (Vertically opposite angles are equal) Angle BAE = Angle DCE (Alternate angles are equal) Triangle ABE is congruent to EDC (ASA) HIGHER ONLY
88 AX = AX AB = AC (Common side) (Given Hypotenuse) Angle AXB = Angle AXC = 90 0 The triangles are congruent (RHS) HIGHER ONLY
89 AB = AD BC = CD AC = AC (Given - SIDE) (Given SIDE) (Common side SIDE) The triangles are congruent (SSS) HIGHER ONLY
90 Pythagoras theorem Finding the hypotenuse: square, add, square root Finding a shorter side: square, subtract, square root
91 Pythagoras theorem Find the length of the line joining (2, 5) and (9, 14) Make a sketch. Draw in a right angled triangle. Find the length of the base and height of the triangle Use Pythagoras theorem x 2 = y 2 x x = = 130 x = 130 = = 11.4 cm (1dp)
92 Pythagoras theorem Is this a right angled triangle? If it is a right angled triangle, then 8 2 = = = = = 61 As 61 is not equal to 64, this is NOT a right angled triangle.
93 Pythagoras theorem 3D Look at the cuboid below. Calculate the length of the diagonal AG which runs through the space inside the cuboid. E H F G 16cm (1) Start by considering the triangle ABC. D 28cm A B AC = cm or Ö 928 C 12cm A (2) Calculate the length of AC. 28 C 12
94 Pythagoras theorem 3D Now look at the cuboid again. H E F G 16cm (3) Now consider triangle ACG. (4) Calculate the length of AG. G 16 D C A Ö 928 AG 2 = (Ö 928) Ö cm AG 2 = 1184 A 28cm B AG = AG = 34.4cm (1dp)
95 Trigonometry SOH CAH TOA sin x! = cos x! = tan x! = opposite hypotenuse adjacent hypotenuse opposite adjacent
96 Trigonometry finding a side SOH CAH TOA HYP OPP H = A C ADJ x = 4 cos 78 = = 19.2 cm (1dp)
97 Trigonometry finding an angle HYP to one decimal place X ADJ OPP SOH CAH TOA sin x = opp hyp sin x = x = sin -1 (10 11) x = x = (1 dp)
98 Trigonometry ABC is an isosceles triangle. Work out the area of the triangle. Give your answer correct to 1 decimal place. SOH CAH TOA Opp Height Hyp O = T A Height = tan 54 0 x 6 = cm Area of triangle = ½ bh cm Adj A = 2 = = 49.5cm 2
99 Trigonometry A 6 metre ladder is used to clean windows. It must stand 1.5 metres from the base of a wall on horizontal ground. In order for the window cleaner to be able to safely use the ladder, the angle between the ground and the ladder cannot exceed 75 o. Is the ladder safe to use? Wall Ground 1.5m Ladder 6m x 0 X Opp 1.5m Adj Hyp 6m x 0 Use CAH cos x = adj hyp cos x = x = cos -1 (1.5 6) x = x = (1 dp) The ladder is not safe to use as the angle exceeds 75 0.
100 Exact trig ratios
101 Trigonometry using exact ratios Find x. SOH CAH TOA OPP HYP ADJ X O = S x H x = sin = ½ x 11 = 5.5 cm
102 Sine and cosine rules Missing sides and angles of non right angled triangles Finding a side Finding an angle Sine rule Cosine rule Sine rule Cosine rule a sin A = Need to know two angles and a side b sin B = c sin C Need to know two sides and an included angle a 2 = b 2 + c 2 2bcCosA Need to know two sides and a non included angle sina a = sinb b = sinc c Need to know all three sides CosA = b2 + c 2 a 2 2bc HIGHER ONLY
103 Sine and cosine rules HIGHER ONLY A fishing boat leaves a harbour (H) and travels due East for 40 miles to a marker buoy (B). At B the boat sails on a bearing of 035 o to a lighthouse (L) 24 miles away. It then returns to harbour. Find the total distance travelled by the boat to the nearest mile. HL 2 = (2 x 40 x 24 x Cos ) L HL 2 = HL 2 = H 40 miles 125 o 24 miles B HL = Ö( ) = miles a 2 = b 2 + c 2 2bcCosA = 57 miles (to the nearest mile) Total distance = = 121 miles
104 Sine and cosine rules Find p to 3 significant figures B c a 15 o p 145 o C A 45 m b a b c = = SinA SinB SinC ü X = ] YZ[ \ YZ[ ^ ü ü a = 45 sin 145 sin 15 p = bc YZ[ dc x sin 145 p = p = 99.7 m (3sf) HIGHER ONLY
105 Sine and cosine rules Find y to 1 decimal place. B a 12.7cm 11.4cm c C YZ[ \ 63 o X b y A sin A 12.7 sin A = = YZ[ e f = sin SinA SinB SinC = = a b c ü YZ[ gh dd.b x 12.7 ü ü Sin A = A = sin -1 ( ) = = (to 1dp) HIGHER ONLY
106 Sine and cosine rules ABC is a triangle in which a = 8.2 cm, b = 10.5 cm and c = 14.6 cm. Calculate the largest angle in the triangle. Give your answer to one decimal place. A c a b C The largest angle is opposite the largest side Cos A = b2 ic 2 ja 2 2bc Cos A = i8.2 2 j Cos A = j A = cos j1 j A = = (1dp) HIGHER ONLY
107 Circle theorems a = 55 0 The angle at the centre is twice the angle at the circumference b = 98 0 Opposite angles in a cyclic quadrilateral add up to d = 35 0 Angles in the same segment are equal HIGHER ONLY
108 Circle theorems B O 3 cm x o 3 cm A 5 cm PB = 5cm P e = 90 0 The angle in a semicircle is a right angle x = 90 0 A tangent and a radius always meet at right angles Tangents from the same point are equal in length HIGHER ONLY
109 Circle theorems HIGHER ONLY
110 Circle theorems Angle ABO = x Base angles in an isosceles triangle are equal 180 2x Angle AOB = 180 2x Angles in a triangle add up to x (180-2x) = x = 2x 180 (90 + 2x) = x = 90-2x Angle OBC = 90 0 A tangent and a radius always meet at right angles Angle BOC = 2x Angles on a straight line add up to Angle ACB = 90 2x Angles in a triangle add up to HIGHER ONLY
111 Circle theorems 90 - x ODB = x Base angles in an isosceles triangle are equal. BOD = 180 2x Angles in a triangle add up to BAD = ½ (180 2x) = 90 - x The angle at the centre is twice the angle at the circumference. BCD = 180 (90 x) = x = 90 + x Opposite angles in a cyclic quadrilateral add up to x 180 2x HIGHER ONLY
112 Vectors a + b - c
113 Vectors a = 3 2 b = 5 6 a + b = = a 3b = = = = 21 22
114 Vectors Write AB as a column vector. AB = 6 5 B A
115 Vectors Write AB as a column vector. AB = 5 1 B A
116 Vectors Write AB as a column vector. AB = 4 2 A B
117 Vectors Write AB as a column vector. AB = 6 0 A B
118 Vectors PQ = PS + SQ = -2a + b = b 2a
119 Vectors CM = ½CB CB = CA + AB = -s + r CM = ½(-s + r) = -½s + ½r HIGHER ONLY
120 Vectors AD = AB + BD = a + ½ BC BC = BA + AC = -a + b AD = a + ½ (-a + b) = a ½ a + ½ b = ½ a + ½ b HIGHER ONLY
121 Vectors 2a 2b 6a HIGHER ONLY
122 Vectors MN = MP + PO + ON = -a 2b+ 3a = 2a 2b
123 Vectors OP = OA + AP = 6a AC AC = AO + OC = -6a + 6c OP = 6a + 2 (-6a + 6c) 3 = 6a 4a + 4c = 2a + 4c HIGHER ONLY
124 Vectors 1 2 AB a 3 4 BC 3b 1 4 BC 1 2 AB HIGHER ONLY
125 Vectors XY = XB + BY = a + 3b YD = YC + CD = b 2a DX = DA + AX = -4b + a HIGHER ONLY
126 Distance-time graphs
127 Speed, distance & time 1 S = D T S = 240 miles 2. 5hrs S = 96 mph
128 Speed, distance & time 2 S = D T 310 miles S = hrs S = mph S = D T 310 miles S = 255 mins S = miles/min S = mph
129 Speed, distance & time 3 The distance time graph shows a cyclist's journey. How much faster was the cyclist's speed between 20 and 30 minutes compared to 0 to 10 minutes? 0 to 10 minutes Distance = 1.5km Time = 10 mins 10 mins = 1. 5 km x 6 x 6 60 mins = 9 km Speed = 9 km/h 20 to 30 minutes Distance = 2.5km Time = 10 mins 10 mins = 2. 5 km x 6 x 6 60 mins = 15 km The cyclists speed was faster by 6 km/h. Speed = 15 km/h
130 Velocity-time graphs For a velocity-time graph: The gradient is the acceleration The area under the graph is the distance travelled a) What was the acceleration in the first 4 seconds? b) How far was travelled in the first 10 seconds? HIGHER ONLY
131 Velocity-time graphs a) What was the acceleration in the first 4 seconds? To find the acceleration find the gradient of the line. Gradient = change in y change in x = 8 4 = 2m/s2 HIGHER ONLY
132 HIGHER ONLY Velocity-time graphs b) How far was travelled in the first 10 seconds? We need to find the area of the graph between 0 and 10 seconds. Area of triangle = 4 8 = 16 2 Area of rectangle = 6 x 8 = 48 Total area = 64 Distance = 64m
133 Gradient of curves The gradient of a curve is constantly changing. Gradient is negative and approaching zero Gradient is positive and increasing HIGHER ONLY
134 Gradient of curves To find the gradient of a curve at a given point, you need to draw a tangent this is a line that only touches the curve at this point. You should then calculate the gradient of the tangent. Example: For the curve opposite, find the gradient when x = Gradient = 4 2 = 2 HIGHER ONLY
135 Gradient of curves Find the gradient of the curve at x = 1-4 Gradient = j4 1 = -4 1 HIGHER ONLY
136 Gradient of curves Find the gradient of the curve at x = Gradient = = 4 3 HIGHER ONLY
137 The graph below shows the first 10 seconds of a cyclists journey. Calculate an estimate for the distance travelled by the cyclist in these 10 seconds. Use 5 strips of equal widths. Areas: Triangle = = 5 Trapezium 1: = x 2 = = 12 Trapezium 2: = x 2 = = 15 Trapezium 3: = x 2 = = 16.5 Trapezium 4: = x 2 = = 17.5 Total area = = 66 units 2 Distance = 66m HIGHER ONLY
138 The graph opposite shows the first 8 seconds of a ball s movement. a) Calculate the acceleration of the ball at time t = 6 b) Calculate the distance travelled by the ball. Use 4 strips of equal widths. a) Gradient = = 2.1 Acceleration = 2.1m/s b) Area = d r d r = = 20.4 units 2 Distance = 20.4m HIGHER ONLY
139
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