1. Friction is defined as a
Friction is defined as a. force that opposes motion between two touching surfaces b. the rate at which velocity changes c. resistance of an object to changes in its velocity d. speed of an object in a particular direction

2. Which of the following units is used to measure acceleration in free fall a. m/s b. m*s c. m/s2 d. m2/s2

3. Which of the following best illustrates balanced forces. a
Which of the following best illustrates balanced forces? a. a rock falling to the ground b. a stretched rubber band being held between two hands c. a person lifting a heavy box off of the ground d. a crash between a large truck and a train

4. What is the speed of an object at rest. a. 15 km/h b. 0 km/h c. 9
What is the speed of an object at rest? a. 15 km/h b. 0 km/h c. 9.8 m/s2 d. none of the above

5. The combination of all of the forces acting on an object is called a
The combination of all of the forces acting on an object is called a. total force b. union of forces c. super force d. net force

6. The difference between speed and velocity is that velocity includes a
The difference between speed and velocity is that velocity includes a. direction b. distance c. time d. weight

7. If you divide momentum by velocity, the result is the object’s a
If you divide momentum by velocity, the result is the object’s a. mass b. direction c. energy d. speed

8. Earth pulls on the moon and holds the moon in its orbit
Earth pulls on the moon and holds the moon in its orbit. The moon pulls on Earth with an equal and opposite force. This is an example of a. Newton’s 1st law b. Newton’s 2nd law c. Newton’s 3rd law d. None of the above

9. Which object does not have momentum a. a fish swimming in a pond b
Which object does not have momentum a. a fish swimming in a pond b. a feather falling to the ground c. a rock by the side of the road d. a boulder rolling down a hill

10. A force is continuously applied to an object, causing it to accelerate
A force is continuously applied to an object, causing it to accelerate. After a period of time, however, the object stops accelerating. What conclusion can be drawn? a. The mass of object has increased b. Gravity on object has increased c. Object is experiencing some kind of friction d. momentum has reached a maximum

11. In order to determine speed, you must know a. time b. distance c
In order to determine speed, you must know a. time b. distance c. both a and b d. none of the above

12. What happens immediately after a skydiver opens her parachute. a
What happens immediately after a skydiver opens her parachute? a. Air resistance greatly increases b. the skydiver is in free fall c. the skydiver’s speed greatly increases d. the force of gravity greatly increases

13. What is the unbalanced force that slows down a ball rolling across the floor? a. friction b. gravity c. inertia d. momentum

14. Which straight-line acceleration indicates an increase in speed. a
Which straight-line acceleration indicates an increase in speed? a. 0 m/s2 b. –15 m/s2 c. 4 m/s2 d. All of the above

15. A car is parked on a hill. In order to keep the car from rolling downhill, how great must the static friction on the car be? a. equal to the force pulling the car dowhill b. greater than the force pulling the car downhill c. greater than the force pulling the car uphill d. smaller than the force pulling the car uphill

16. An object is in motion when a. you observe the object move. b
An object is in motion when a. you observe the object move. b. the object’s speed increases c. the object’s displacement is greater than the distance traveled d. the object changes position relative to a stationary reference point

17. Which of the following is true. a
Which of the following is true? a. weight and mass are proportional but not equal b. weight is the gravitational force an object experiences due to mass c. the weight of an object on Earth is greater than the weight of the same object on the surface of the moon, but the object’s mass stays the same d. All of the above

18. Which is an example of kinetic friction. a
Which is an example of kinetic friction? a. friction between a car’s windshield and the air as you drive into the wind b. friction between your shoes and the ground when you stand still c. friction between a sticky note and the page of a book d. friction between your skin and a pencil as it rests in your palm

19. The law that states that every object maintains constant velocity unless acted on by an unbalanced force is a. Newton’s 1st law b. Newton’s 2nd law c. Newton’s 3rd law d. law of conservation of momentum

20. What is the reaction force when you place a cup on a table. a
What is the reaction force when you place a cup on a table? a. the force of cup on table b. the force of table on cup c. the force of gravity on table d. the force of gravity on cup

21. If the net force acting on a stationary object is zero, then the object will a. accelerate in the direction of strongest force b. remain at rest c. begin moving backwards d. decelerate at a steady rate

22. When air resistance balances the weight of an object that is falling, the velocity a. slowly decreases b. remains constant c. rapidly increases d. None of the above

23. Which of the following is not a factor in calculating momentum. a
Which of the following is not a factor in calculating momentum? a. mass b. direction c. acceleration d. speed

24. On a velocity-time graph, a line with a negative slope indicates that the object is a. speeding up b. slowing down c. not moving d. traveling at constant speed

25. Which of the following statements is true. a
Which of the following statements is true? a. Frictional forces are greatest when both surfaces are rough b. When a truck is parked on a hill, friction pulls the truck down the hill. c. Air resistance always opposes friction d. All of the above

26. Answers
1. A
10. C
19. A
2. C
11. C
20. B
3. B
12. A
21. B
4. B
13. A
22. B
5. D
14. C
23. C
6. A
15. A
24. B
7. A
16. D
25. A
8. C
17. D
9. C
18. A