Name Class Date
Forces and Motion
Matching
Match the correct definition with the correct term. Write the letter in the space provided. Some terms will not be used.
1. a push or a pull that always acts on an object
2. a change in a moving object’s speed or direction
3. a force that always acts to oppose motion between two objects
4. the amount of matter an object has
5. the measure of gravitational force exerted on an object
6. speed of an object in a particular direction
7. the force of attraction between objects
Multiple Choice
Write the letter of the correct answer in the space provided.
8. What is an object that appears to stay in place and that helps you detect motion in another object?
a. a newton
b. a lubricant
c. a black hole
d. a reference point
9. Inertia is
a. the attraction between two objects.
b. the tendency of an object to resist motion or a change in motion.
c. the speed of an object at one moment in time.
d. the statement that force equals mass times acceleration.
10. To calculate an object’s average acceleration, you need to know
a. starting velocity, distance traveled, and speed.
b. starting point, endpoint, and the object’s mass.
c. starting velocity, final velocity, and time it takes to change velocity.
d. average speed, distance, and the time it takes to change velocity.
11. The gravitational pull is greater between two objects that
a. have greater masses.
b. have rougher surfaces.
c. are farther apart.
d. are moving at greater speed.
12. What is the net force on an object when you combine a force of 10 N north with a force of 5 N south?
a. 5 N south
b. 15 N north
c. 50 N north
d. 5 N north
13. Forces are typically measured in
a. grams
b. Joules
c. Einstiens
d. Newtons
14. Dividing the total distance traveled by the total time is how to calculate
a. average speed.
b. average velocity.
c. average acceleration.
d. average motion.
15. The difference between speed and velocity is that
a. velocity involves time, while speed does not.
b. speed involves time, while velocity does not.
c. velocity has direction, while speed does not.
d. speed has direction, while velocity does not.
16. To produce change in motion, the net force must be a(n)
a. balanced force.
b. unbalanced force.
c. frictional force.
d. gravitational force.
17. The law of universal gravitation says that gravitational force is
a. related to mass and distance.
b. related to weight and distance.
c. related to mass and friction.
d. related to weight and friction.
18. Friction occurs because of
a. the roughness of any object’s surface.
b. only the weights of any two objects.
c. only the masses of any two objects.
d. unbalanced forces.
19. A hiker’s velocity begins at 1.8 m/s uphill and changes to 1.5 m/s uphill. How do you know that the hiker has a negative acceleration?
a. The direction changed.
b. The direction was unchanged.
c. The speed increased.
d. The speed decreased.
20. In which of the following is a skater NOT accelerating?
a. going straight while speeding up
b. going straight at constant speed
c. making circles at constant speed
d. going straight while slowing down
21. If a student has a weight of 420 N on Earth, what is the student’s weight on the moon? (Moon’s gravity = 1/6 of Earth’s gravity)
a. 70 N
b. 2520 N
c. 70 kg
d. 2520 kg
22. Which of the following is the formula for finding kinetic energy?
a. KE = m/v c. KE = mv2/2
b. KE = mv/2 d. KE = v/2
23. An unbalanced force can cause an object’s motion to change by
a. changing direction or speed; starting but not stopping motion.
b. changing direction or speed, starting or stopping motion.
c. changing direction or speed; stopping but not starting motion.
d. changing direction or speed only.
_____ 24. An acorn on a tree is an example of
a. a force.
b. kinetic energy.
c. potential energy.
d. thermal energy.
25. After an energy conversion, you end up with the same total amount of energy as the original amount of potential energy. Which of the following laws explains this rule?
a. law of energy changes
b. law of conservation of energy
c. law of power and energy
d. law of potential energy
26. When a bat hits a baseball, which of the following is transferred from the bat to the ball?
a. work c. force
b. energy d. electrical energy
27. As a baseball flies through the air after being hit, which of the following types of energy does it have?
a. potential energy c. mechanical energy
b. kinetic energy d. chemical energy
INTERPRETING GRAPHICS
The following graph shows the distance Kyle traveled on his bicycle trip and the amount of time it took him to travel that distance. Use the graph to answer questions 28 through 30.
_____ 28. During which five minute interval did Kyle achieve the highest
average speed?
a. Between 5 and 10 minutes
b. Between 10 and 15 minutes
c. Between 15 and 20 minutes
d. Between 20 and 25 minutes
_____ 29. Which of the following may have occurred in the period between
10 and 15 minutes?
a. Kyle took a lunch break
b. Kyle decided to follow a deer on his bicycle
c. Kyle tried to catch-up with the bicyclers in front of him
d. Kyle got injured and stopped his bicycle trip
_____ 30. What was Kyle’s average speed for the entire bicycle trip?
a. 5 km/min
b. .2 km/min
c. 1 km/min
d. 5 min/km
Original content Copyright © by Holt, Rinehart and Winston. Additions and changes to the original content are the responsibility of the instructor.
Holt Science and technology 64 Matter in Motion