Preview. Two-Dimensional Motion and Vectors Section 1. Section 1 Introduction to Vectors. Section 2 Vector Operations. Section 3 Projectile Motion
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1 Two-Dimensional Motion and Vectors Section 1 Preview Section 1 Introduction to Vectors Section 2 Vector Operations Section 3 Projectile Motion Section 4 Relative Motion
2 Two-Dimensional Motion and Vectors Section 1 TEKS The student is expected to: 3F express and interpret relationships symbolically in accordance with accepted theories to make predictions and solve problems mathematically, including problems requiring proportional reasoning and graphical vector addition
3 Two-Dimensional Motion and Vectors Section 1 What do you think? How are measurements such as mass and volume different from measurements such as velocity and acceleration? How can you add two velocities that are in different directions?
4 Two-Dimensional Motion and Vectors Section 1 Introduction to Vectors Scalar - a quantity that has magnitude but no direction Examples: volume, mass, temperature, speed Vector - a quantity that has both magnitude and direction Examples: acceleration, velocity, displacement, force
5 Two-Dimensional Motion and Vectors Section 1 Vector Properties Vectors are generally drawn as arrows. Length represents the magnitude Arrow shows the direction Resultant - the sum of two or more vectors
6 Two-Dimensional Motion and Vectors Section 1 Finding the Resultant Graphically Method Draw each vector in the proper direction. Establish a scale (i.e. 1 cm = 2 m) and draw the vector the appropriate length. Draw the resultant from the tip of the first vector to the tail of the last vector. Measure the resultant. The resultant for the addition of a + b is shown to the left as c.
7 Two-Dimensional Motion and Vectors Section 1 Vector Addition Vectors can be moved parallel to themselves without changing the resultant. the red arrow represents the resultant of the two vectors
8 Two-Dimensional Motion and Vectors Section 1 Vector Addition Vectors can be added in any order. The resultant (d) is the same in each case Subtraction is simply the addition of the opposite vector.
9 Two-Dimensional Motion and Vectors Section 1 Properties of Vectors Click below to watch the Visual Concept. Visual Concept
10 Two-Dimensional Motion and Vectors Section 1 Sample Resultant Calculation A toy car moves with a velocity of.80 m/s across a moving walkway that travels at 1.5 m/s. Find the resultant speed of the car.
11 Two-Dimensional Motion and Vectors Section 1 Now what do you think? How are measurements such as mass and volume different from measurements such as velocity and acceleration? How can you add two velocities that are in different directions?
12 Two-Dimensional Motion and Vectors Section 2 TEKS The student is expected to: 3F express and interpret relationships symbolically in accordance with accepted theories to make predictions and solve problems mathematically, including problems requiring proportional reasoning and graphical vector addition
13 Two-Dimensional Motion and Vectors Section 2 What do you think? What is one disadvantage of adding vectors by the graphical method? Is there an easier way to add vectors?
14 Two-Dimensional Motion and Vectors Section 2 Vector Operations Use a traditional x-y coordinate system as shown below on the right. The Pythagorean theorem and tangent function can be used to add vectors. More accurate and less time-consuming than the graphical method
15 Two-Dimensional Motion and Vectors Section 2 Pythagorean Theorem and Tangent Function
16 Two-Dimensional Motion and Vectors Section 2 Vector Addition - Sample Problems 12 km east + 9 km east =? Resultant: 21 km east 12 km east + 9 km west =? Resultant: 3 km east 12 km east + 9 km south =? Resultant: 15 km at 37 south of east 12 km east + 8 km north =? Resultant: 14 km at 34 north of east
17 Two-Dimensional Motion and Vectors Section 2 Resolving Vectors Into Components
18 Two-Dimensional Motion and Vectors Section 2 Resolving Vectors into Components Opposite of vector addition Vectors are resolved into x and y components For the vector shown at right, find the vector components v x (velocity in the x direction) and v y (velocity in the y direction). Assume that that the angle is Answers: v x = 89 km/h v y = 32 km/h
19 Two-Dimensional Motion and Vectors Section 2 Adding Non-Perpendicular Vectors Four steps Resolve each vector into x and y components Add the x components (x total = x 1 + x 2 ) Add the y components (y total = y 1 + y 2 ) Combine the x and y totals as perpendicular vectors
20 Two-Dimensional Motion and Vectors Section 2 Adding Vectors Algebraically Click below to watch the Visual Concept. Visual Concept
21 Two-Dimensional Motion and Vectors Section 2 Classroom Practice A camper walks 4.5 km at 45 north of east and then walks 4.5 km due south. Find the camper s total displacement. Answer 3.4 km at 22 S of E
22 Two-Dimensional Motion and Vectors Section 2 Now what do you think? Compare the two methods of adding vectors. What is one advantage of adding vectors with trigonometry? Are there some situations in which the graphical method is advantageous?
23 Two-Dimensional Motion and Vectors Section 3 TEKS The student is expected to: 4C analyze and describe accelerated motion in two dimensions using equations, including projectile and circular examples
24 Two-Dimensional Motion and Vectors Section 3 What do you think? Suppose two coins fall off of a table simultaneously. One coin falls straight downward. The other coin slides off the table horizontally and lands several meters from the base of the table. Which coin will strike the floor first? Explain your reasoning. Would your answer change if the second coin was moving so fast that it landed 50 m from the base of the table? Why or why not?
25 Two-Dimensional Motion and Vectors Section 3 Projectile Motion Projectiles: objects that are launched into the air tennis balls, arrows, baseballs, wrestlers Gravity affects the motion Path is parabolic if air resistance is ignored Path is shortened under the effects of air resistance
26 Two-Dimensional Motion and Vectors Section 3 Components of Projectile Motion As the runner launches herself (v i ), she is moving in the x and y directions. vx, i = vi cosθ vy, i = vi sinθ
27 Two-Dimensional Motion and Vectors Section 3 Analysis of Projectile Motion Horizontal motion No horizontal acceleration Horizontal velocity (v x ) is constant. How would the horizontal distance traveled change during successive time intervals of 0.1 s each? Horizontal motion of a projectile launched at an angle:
28 Two-Dimensional Motion and Vectors Section 3 Analysis of Projectile Motion Vertical motion is simple free fall. Acceleration (a g ) is a constant m/s 2. Vertical velocity changes. How would the vertical distance traveled change during successive time intervals of 0.1 seconds each? Vertical motion of a projectile launched at an angle:
29 Two-Dimensional Motion and Vectors Section 3 Projectile Motion Click below to watch the Visual Concept. Visual Concept
30 Two-Dimensional Motion and Vectors Section 3 Projectile Motion - Special Case Initial velocity is horizontal only (v i,y = 0).
31 Two-Dimensional Motion and Vectors Section 3 Projectile Motion Summary Projectile motion is free fall with an initial horizontal speed. Vertical and horizontal motion are independent of each other. Horizontally the velocity is constant. Vertically the acceleration is constant (-9.81 m/s 2 ). Components are used to solve for vertical and horizontal quantities. Time is the same for both vertical and horizontal motion. Velocity at the peak is purely horizontal (v y = 0).
32 Two-Dimensional Motion and Vectors Section 3 Classroom Practice Problem (Horizontal Launch) People in movies often jump from buildings into pools. If a person jumps horizontally by running straight off a rooftop from a height of 30.0 m to a pool that is 5.0 m from the building, with what initial speed must the person jump? Answer: 2.0 m/s
33 Two-Dimensional Motion and Vectors Section 3 Classroom Practice Problem (Projectile Launched at an Angle) A golfer practices driving balls off a cliff and into the water below. The edge of the cliff is 15 m above the water. If the golf ball is launched at 51 m/s at an angle of 15, how far does the ball travel horizontally before hitting the water? Answer: 1.7 x 10 2 m (170 m)
34 Two-Dimensional Motion and Vectors Section 3 Now what do you think? Suppose two coins fall off of a table simultaneously. One coin falls straight downward. The other coin slides off the table horizontally and lands several meters from the base of the table. Which coin will strike the floor first? Explain your reasoning. Would your answer change if the second coin was moving so fast that it landed 50 m from the base of the table? Why or why not?
35 Two-Dimensional Motion and Vectors Section 4 TEKS The student is expected to: 4F identify and describe motion relative to different frames of reference
36 Two-Dimensional Motion and Vectors Section 4 What do you think? One person says a car is traveling at 10 km/h while another states it is traveling at 90 km/h. Both of them are correct. How can this occur? Consider the frame of reference. Suppose you are traveling at a constant 80 km/h when a car passes you. This car is traveling at a constant 90 km/h. How fast is it going, relative to your frame of reference? How fast is it moving, relative to Earth as a frame of reference?
37 Two-Dimensional Motion and Vectors Section 4 Relative Motion Velocity differs in different frames of reference. Observe as your instructor walks across the front of the room at a steady speed and drops a tennis ball during the walk. Describe the motion of the ball from the teacher s frame of reference. Describe the motion of the ball from a student s frame of reference. Which is the correct description of the motion?
38 Two-Dimensional Motion and Vectors Section 4 Relative Motion Click below to watch the Visual Concept. Visual Concept
39 Two-Dimensional Motion and Vectors Section 4 Frames of Reference A falling object is shown from two different frames of reference: the pilot (top row) an observer on the ground (bottom row)
40 Two-Dimensional Motion and Vectors Section 4 Relative Velocity v ac = v ab + v bc v ac means the velocity of object a with respect to frame of reference c Note: v ac = -v ca When solving relative velocity problems, follow this technique for writing subscripts.
41 Two-Dimensional Motion and Vectors Section 4 Sample Problem A boat is traveling downstream. The speed of the boat with respect to Earth (v be ) is 20 km/h. The speed of the river with respect to Earth (v re ) is 5 km/h. What is the speed of the boat with respect to the river? Solution: v br = v be + v er = v be + (-v re ) = 20 km/h + (-5 km/h) v br = 15 km/h
42 Two-Dimensional Motion and Vectors Section 4 Classroom Practice Problem A plane flies northeast at an airspeed of 563 km/h. (Airspeed is the speed of the aircraft relative to the air.) A 48.0 km/h wind is blowing to the southeast. What is the plane s velocity relative to the ground? Answer: km/h at 40.1 north of east How would this pilot need to adjust the direction in order to to maintain a heading of northeast?
43 Two-Dimensional Motion and Vectors Section 4 Now what do you think? Suppose you are traveling at a constant 80 km/h when a car passes you. This car is traveling at a constant 90 km/h. How fast is it going, relative to your frame of reference? How fast is it moving, relative to Earth as a frame of reference? Does velocity always depend on the frame of reference? Does acceleration depend on the frame of reference?
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