Motion Equations

1) If an object has a greater speed than a second object, does the first object necessarily have a greater acceleration? Explain.

2) Compare the acceleration of a motorcycle that accelerates from 80km/hr to 90km/hr with the acceleration of a bicycle that accelerates from rest to 10km/hr in the same amount of time.

3) Can an object have a northward velocity and a southward acceleration? Explain.

4) Can the velocity of an object be negative when its acceleration is positive? Explain.

5) A pitcher and catcher are separated by 10m and are playing catch with a baseball. The catcher begins walking toward the pitcher the instant he threw the ball. The ball bounced off the catcher’s glove back to the pitcher, then bounced off the pitcher back to the catcher’s mitt, and so on until the catcher reached the pitcher and the ball was trapped between the two. If the catcher walked toward the pitcher at a rate of 1 m/sec and the ball traveled at a speed of 14 m/sec, what was the total distance the ball traveled back and forth before being trapped?

6) A sports car accelerates from rest to 95 km/hr in 6.2 sec. What is its acceleration?

7) A sprinter accelerates from rest to 10.0 m/s in 1.35 sec. a) What is her acceleration? B) How far did she travel?

8) A car slows from 25 m/s to 12 m/s in 6.0 sec. a) What is its acceleration? B) how far did it travel?

9) A light plane must reach a speed of 30 m/s for takeoff. How long a runway is needed if the acceleration of the plane is 3.0 m/s2? 10) A car slows from a speed of 25.0 m/s to rest in 5.00 sec. How far did it travel during this time?

11) Determine the stopping distance for an auto with an initial speed of 90 km/hr and a deceleration of 4.00 m/s2. Assume the human reaction time is 1.0 sec.

12) A speeding motorist traveling at 120 km/hr passes a stationary police officer. The officer immediately begins pursuit at an acceleration of 2.8 m/s2. How much time will it take the officer to reach the speeder (assume the speeder’s speed does not change)? How fast will the officer be traveling at that time?