Physical Science Chapter 12 Exam Questions and
Correct
1. Force correct answer: a push or pull that causes on object to start moving, stop moving, or slow
down
2. What two things do all forces have? correct answer: magnitude (amount) and
direction
3. Net-Force correct answer: total force (acting on an object after all the forces are combined)
4. Balanced Forces correct answer: do not cause a change in motion
5. Unbalanced Forces correct answer: Objects accelerate in the direction of the greater force
6. How do you find the Net-Force if two forces are exerted in the
same direc- tion? correct answer: you add to get the Net-Force.
7. How do you find the Net-Force if two forces are exerted in the
opposite direction? correct answer: you subtract to get the Net-Force.
8. Can you have a negative force? correct answer: no, you answer in always positive.
9. Friction correct answer: a force that opposes (goes against/tries to stop) motion between two
forces that are in contact
10. Is friction good or bad? correct answer: both correct answer: A) helps a car
start moving
B) helps a car stop moving (tires on the road)
11. What are the four types of friction? correct answer: static, sliding, rolling,
fluid
12. Describe Static Friction correct answer: the force that acts on objects that are not
moving (this force tries to resist an object from being moved)
13. Describe Sliding Friction correct answer: a force that acts on an object when it
slides a suface
14. Describe Rolling Friction correct answer: a force that acts on an object when it rolls
across a suface
15. Describe Fluid Friction correct answer: a force that opposes the motion of an object as
it moves through a flid
16. What are fluids? correct answer: liquids or gases- Air resistance
17. Is Rolling Friction more or less than Sliding Friction? correct
answer: Less.
1/
5
, 18. The amount of friction depends on correct answer: 1
correct answer: 1. the surface the object is on; rough surface=
MORE friction
smooth surface= LESS friction
19. The amount of friction depends on correct answer: 2 correct
answer: the weight surface
20. Gravity correct answer: a force that acts between two masses
21. Law of Universal Gravitation correct answer: every object in the universe attracts
every other objects
22. the grater the mass of the objects. correct answer: the grater the
gravitational pull
23. the greater the distance the distance between the objects,
correct answer: the weaker the pull becomes
24. What is the amount of gravity on Earth? correct answer: 9.8
m/s*2
25. What is the amount of gravity on the Moon? correct answer: 1.6
m/s*2
2/
5
Correct
1. Force correct answer: a push or pull that causes on object to start moving, stop moving, or slow
down
2. What two things do all forces have? correct answer: magnitude (amount) and
direction
3. Net-Force correct answer: total force (acting on an object after all the forces are combined)
4. Balanced Forces correct answer: do not cause a change in motion
5. Unbalanced Forces correct answer: Objects accelerate in the direction of the greater force
6. How do you find the Net-Force if two forces are exerted in the
same direc- tion? correct answer: you add to get the Net-Force.
7. How do you find the Net-Force if two forces are exerted in the
opposite direction? correct answer: you subtract to get the Net-Force.
8. Can you have a negative force? correct answer: no, you answer in always positive.
9. Friction correct answer: a force that opposes (goes against/tries to stop) motion between two
forces that are in contact
10. Is friction good or bad? correct answer: both correct answer: A) helps a car
start moving
B) helps a car stop moving (tires on the road)
11. What are the four types of friction? correct answer: static, sliding, rolling,
fluid
12. Describe Static Friction correct answer: the force that acts on objects that are not
moving (this force tries to resist an object from being moved)
13. Describe Sliding Friction correct answer: a force that acts on an object when it
slides a suface
14. Describe Rolling Friction correct answer: a force that acts on an object when it rolls
across a suface
15. Describe Fluid Friction correct answer: a force that opposes the motion of an object as
it moves through a flid
16. What are fluids? correct answer: liquids or gases- Air resistance
17. Is Rolling Friction more or less than Sliding Friction? correct
answer: Less.
1/
5
, 18. The amount of friction depends on correct answer: 1
correct answer: 1. the surface the object is on; rough surface=
MORE friction
smooth surface= LESS friction
19. The amount of friction depends on correct answer: 2 correct
answer: the weight surface
20. Gravity correct answer: a force that acts between two masses
21. Law of Universal Gravitation correct answer: every object in the universe attracts
every other objects
22. the grater the mass of the objects. correct answer: the grater the
gravitational pull
23. the greater the distance the distance between the objects,
correct answer: the weaker the pull becomes
24. What is the amount of gravity on Earth? correct answer: 9.8
m/s*2
25. What is the amount of gravity on the Moon? correct answer: 1.6
m/s*2
2/
5
