CT1. Sue runs towards Jim starting from rest. The dots in the motion diagram below represent Sue’s position at 0.2-second time intervals. Which diagram could represent Sue's initial motion?

1. a)
2. b)
3. c)

Answer

CT2. Two balls are the same size, but one weighs twice as much as the other. The balls are dropped from the top of a two-story building at the same instant of time. The time it takes for the balls to reach the ground is

1. about half as long for the heavier ball.
2. about half as long for the lighter ball.
3. about the same for both balls.
4. considerably less for the heavier ball, but not necessarily half.
5. considerably less for the lighter ball, but not necessarily half.

Answer

CT3. Which of the following statements constitutes a scientific hypothesis:

1. Atoms are the smallest particles of matter that exist
2. Space is permeated with a substance that is undetectable
3. Albert Einstein is the greatest physicist of the twentieth century

Answer

CT4. You hold a ball in your hand at a fixed height and release it. Its initial acceleration is

1. up
2. zero
3. down

Answer

CT5. A bullet is fired straight up from height H while a second is fired straight down. Neglect air resistance. After the bullets have left the guns,

1. The one fired up has the greater acceleration.
2. The one fired down has the greater acceleration.
3. The accelerations are the same.      
4. Neither bullet accelerates after it has been fired.

Answer

CT6. A car is traveling on Interstate 40 (which goes from Las Vegas, NV to Winston-Salem, NC). Suppose we choose the positive x direction to be east. In which of the following situations is the average acceleration of the car negative?

1. The car is initially going 10 m/s east and then, at a later time, goes 30 m/s east.
2. The car is initially going 10 m/s west and then, at a later time, goes 30 m/s west.
3. The car is initially going 30 m/s east and then, at a later time, goes 10 m/s east.
4. The car is initially going 30 m/s west and then, at a later time, goes 10m/s west.
5. The car is initially going 10 m/s east and then, at a later time, goes 30 m/s west.
6. Two of the above
7. Three of the above

Answer

CT7. You are standing by a window and see a ball (thrown from below) moving up past the window. The ball is visible for time t_u. On its way down, the ball is visible for time t_d. Neglecting the effects of air resistance, how do t_u and t_d compare?

1. t_u < t_d
2. t_u = t_d
3. t_u > t_d
4. Not enough information given

Answer

CT8. If a ball is thrown upwards, which of the choices below is true at the top of the ball’s flight?

1. v = 0; a does not equal 0
2. v = 0; a = 0
3. v does not equal 0; a does not equal 0
4. v does not equal 0; a = 0
5. depends on coordinate system chosen

Answer

CT9. Can an object have v = 0 and a not equal to 0 simultaneously?

1. yes
2. no

Answer

CT10. Can an object have a = 0 and v not equal to 0 simultaneously?

1. yes
2. no

Answer