1.3 Questions 1. Describe three characteristics that an accelerating 6. (a) Describe the motion of the object in all three segments object may exhibit. Give a real-world example of each of the graph shown in Figure 8. characteristic. k/u c (b) Calculate the average acceleration of the object in all 2. Describe, in your own words, how you would determine the three segments of the graph in Figure 8. acceleration of an object from a velocity-time graph. kru c (c) Calculate the total displacement of the object from 0 s to 3. Describe, in your own words, how you would determine 4.0 s, from 4.0 s to 7.0 s, and from 7.0 s to 10.0 s. Tal c the displacement of an object from a velocity-time graph. K/u c Velocity v. Time for Complex Motion 7.0 4. Determine the average acceleration described by each of 6.0 the following graphs. TA 5.0 (a) Velocity v. Time for Accelerated Motion 30.0 4.0 i(m/s [W]) 25.0 3.0 20.0 2.0 v (m/s [E]) 15.0 1.0 10.0 0 5.0 0 1.0 2.0 3.0 4.0 5.0 6.0 7.0 8.0 9.0 10.0 Figure 8 t(s) 0 1.0 2.0 3.0 4.0 5.0 6.0 7.0 t(s) 7. What is the average acceleration of a sports car that (b) Velocity v. Time for Accelerated Motion increases its velocity from 2.0 m/s [W] to 4.5 m/s [W] 30.0 in 1.9 s? T/ 25.0 8. If a child on a bicycle can accelerate at an average rate of 20.0 0.53 m/s', how long would it take to increase the bicycle's 15.0 velocity from 0.68 m/s [N] to 0.89 m/s [N]? TA 10.0 9. (a) While approaching a red light, a student driver begins to 5.0 apply the brakes. If the car's brakes can cause an average acceleration of 2.90 m/s' [S] and it takes 5.72 s for the 0 0 1.0 2.0 3.0 4.0 5.0 6.0 7.0 car to come to rest, what was the car's initial velocity? t (s) (b) What is the significance of the direction of the initial velocity and that of the acceleration? TA (c) Velocity v. Time for Accelerated Motion 3.0 7 10. What is the average acceleration of a tennis ball that has an 2.5 initial velocity of 6.0 m/s [E] and a final velocity of 7.3 m/s [W], if it is in contact with a tennis racket for 0.094 s? T/ 11. (a) Determine the instantaneous velocity at t = 6.0 s in 1.5 Figure 9. 1.0 (b) Determine the average velocity of the motion depicted 0.5 in Figure 9. T/ 0 1.0 3.0 4.0 5.0 6.0 7.0 Position v. Time for Accelerated Motion t (s) 250 200 5. One of your classmates makes the following statement: "If an object has an initial velocity of 10 m/s [N] and a final 150 velocity of 10 m/s [S], this object has clearly not accelerated, d (m [W]) 100 as it is travelling at a constant speed." Write an email to this 50 student explaining why this statement is incorrect. k/u c 0 -50 1.0 2.0 3.0 4.0 5.0 6.0 7.0 8.0 9.0 10.0 t(s) Figure 9 Chapter 1 . Motion in a Straight Line
