Name______Date______Class______
Forces and Motion Review
Directions: Match the definition to the correct term by writing the letter of the correct answer in the blank.
_____1. forceA. a device that makes work easier by changing the amount or direction of a force.
_____2. net forceB. a force that opposes motion between two surfaces that are touching.
_____3. balanced forceC. a flat, slanted surface that reduces the force needed to lift an object to a height.
_____4. unbalanced forceD. a grooved wheel with a rope or a chain wrapped around it.
_____5. Newton (N)E. the rate at which velocity changes; changing speed or changing direction.
_____6. gravityF. the distance an object travels in one unit of time.
_____7. inertiaG. the state in which one object’s distance from another is changing.
_____8. meterH.basic SI unit for length.
_____9. motionI.speed in a given direction.
____10. speedJ. the force that pulls objects toward each other.
____11. velocityK. a nonzero net force that changes an object’s motion.
____12. accelerationL. the overall force on an object when all the individual forces acting on an object are
____13. simple machine added together.
____14. pulleyM. the tendency of all objects to resist any change in motion.
____15. inclined planeN. the SI unit for force.
____16. frictionO. a push or a pull exerted on an object.
P. equal forces acting on an object in opposite directions.
Multiple Choice: Select the best choice that answers the question or completes the statement.
17. Speed equals distance divided by
A. time
B. velocity
C. size
D. motion.
18. If the speed of an object does not change, the object is traveling at a(n)
A. average speed
B. increasing speed
C. constant speed
D. decreasing speed
19. If a bicyclist travels 30 kilometers in two hours, her average speed is ______. Show your work and use correct units.
A. 30 km/h
B. 60 km/h
C. 15 km/h
D. 2 km/h
20.Which of these is not an example of acceleration?
A. a bird taking off for flight
B. a roller coaster going down the first hill
C. a car sitting in a parking lot
D. an airplane turning to change its course
21. If you know a car traveled 300 kilometers in 3 hours, you can find its
A. reference point
B. direction
C. speed
D. velocity
22. You can show the motion of an object on a line graph in which you plot distance against
A. velocity
B. time
C. speed
D. direction
23. In graphing motion, the steepness of the slope depends on
A. how quickly or slowly the object is moving
B. how far the object has moved
C. when the object began moving
D. the direction the object is moving
24. On a graph showing distance versus time, a horizontal line represents an object that is
A. increasing speed
B. decreasing speed
C. not moving at all
D. moving at a constant speed
25. When a force changes an objects motion, the force is
A. balanced
B. moving
C. net
D. unbalanced
26. Changing direction and changing speed is a type of
A. acceleration
B. speed
C. velocity
D. constant rate
27. If an object starts to accelerate
A. a balanced force is acting on it
B. gravity is acting on it
C. velocity is acting on it
D. an unbalanced force is acting on it
28. A person in a head on collision who is not wearing a seat belt continues to move forward at the original speed because of
A. friction
B. inertia
C. gravity
D. weight
29. Which of the following objects has the greatest inertia?
A. baseball
B. bowling ball
C. pencil
D. toothpick
30. What is the net force of the object shown above?
A. 30 N to the right
B. 50 N to the right
C. 30 N to the left
D. 50 N to the left
31. When forces are balanced, the net force
A. is greater than the sum of the forces
B. is zero
C. is negative
D. is equal to the largest force
32. When an object is a t rest, what is its speed?
A. 1 m/s
B. 2 m/s
C. 0 m/s
D. 3 m/s
Use the picture above to answer questions 33-34.
33. If the ball is moving to the left, which set of forces acting on the ball must be balanced?
AA and B
B A and C
C B and D
D C and D
34. If the ball is moving to the left, which set of forces acting on the ball must be unbalanced?
AA and B
B A and C
C B and D
D C and D
Use the motion graph above to answer questions 35-37.
35. How would you describe Kathy’s motion ?
A. Kathy is not moving
B. Kathy is accelerating
C. Kathy is traveling at a constant speed
D. Kathy is decelerating
36. What is Kathy’s average speed? Show your work and use correct units.
A. 140 m/min
B. 150 m/min
C. 160 m/min
D. 1500 m/min
37. Describe Rachel’s motion at 9 minutes.
A. Rachel is not moving
B. Rachel is accelerating
C. Rachel is moving at a constant speed
D. Rachel is decelerating