1. Car A travels from milepost 93 to milepost 99 in 5 minutes. Car B travels from milepost 493 to milepost 499 in 5 minutes. Which car has the greatest average speed?
a. Car A
b. Car B
c. Their average speeds are the same
d. There is not enough information to be able to say.
2. An object is accelerating
a. Only if its speed changes
b. Only when its direction changes
c. When its speed and direction changes
d. If its velocity is large
3. When we say that light objects and heavy objects fall at the same rate, what assumption are we making?
a. They have the same shape
b. They are falling in vacuum
c. They are made of the same material
d. They have the same size
4. The moon is a nice place to study free-fall because is has no atmosphere. If an astronaut on the moon simultaneously drops a hammer and a feather from the same height, which one hits the ground first?
a. The hammer
b. The feather
c. They hit at the same time
d. They don’t fall
5. If the net force on a hot-air balloon is directed straight upward, which way does the acceleration point?
a. Downward
b. Upward
c. Upward only if the balloon is rising
d. Upward and downward
6. When the same net force is applied to two blocks, the yellow one has a larger acceleration than the blue one. Which of the following is correct?
a. The yellow block has a larger mass
b. The blue block has a larger mass
c. They have the same mass
d. The yellow block has a larger weight.
7. When a snowflake falls, it quickly reaches a terminal velocity. This happens because
a. The mass of the snowflake is too small for gravity to have any effect
b. There is not net force on it
c. The snowflake has no weight
d. The mass of the snowflake is smaller than its weight
8. What centripetal acceleration is required to follow a circular path with a radius of 100 m at a speed of 20 m/s?
a. 1 m/s/s
b. 2 m/s/s
c. 3 m/s/s
d. 4 m/s/s
9. A yellow car takes ten minutes to go from milepost 101 to milepost 109. A red car takes ten minutes to go from milepost 11 to milepost 21.
Which car has the higher average speed?
a. The yellow one
b. The red one
c. The average speeds are the same
d. Not enough information is given to be able to say.
10. The average acceleration of an object is defined to be the
a. Distance it travels divided by the time it takes
b. Change in its velocity divided by the time this change takes
c. Change in its speed divided by the time this change takes
d. Average of the accelerations during the two halves of the trip.
11. A ping-pong ball and a golf ball have approximately the same size but very different masses. Which hits the ground first if you drop them simultaneously while standing on the moon?
a. The ping-pong ball
b. The golf ball
c. They hit simultaneously
d. They don’t fall
12. If an object moves with a constant velocity, we can conclude that
e. It is moving toward its natural place
f. There is no forces acting on it
g. There is no unbalanced (net) force acting on it
h. It has a very large inertia.
13. The same net force is applied to two blocks. If the yellow one has a larger mass than the blue one, which one have the larger acceleration?
- The yellow block
- The blue block
- They have the same acceleration
- We cannot say
14. A bug rides a phonograph record. In which direction does the acceleration of the bug point?
- Tangent to the circular path
- Toward the center of the record
- Away from the center of the record
- Up
15. Describe the force(s) that allow you to walk across the room. Explain your reasoning.
16. Two ropes are being used to pull a car out of a ditch. Each rope exerts a force of 700 N on the car. Is it possible for the sum of these two forces to have a magnitude of 1000N? Explain your reasoning.
17. If you were traveling toward a distant star and you ran out of fuel, would your spaceship slow down and stop? Explain.
17.