1. Forces Review

2. Which of the following is the cause of an acceleration or a change in an object’s motion?
speed
inertia
force
velocity

3. Which of the following forces is an example of a field force?
gravitational force
frictional force
normal force
tension

4. A cart is pushed with an acceleration of 2 m/s2. If µ = 0
A cart is pushed with an acceleration of 2 m/s2. If µ = 0.5, what does the net force equal? FA
FFr
FA – FN
FA – FFr

5. An army ranger is lifted by a cable to a helicopter at a constant velocity?Fg
FT – Fg
Fg – FT

6. A bike is coasting to a stop. What is the net force equal to?
Gravitational Force
Zero
Frictional Force
Normal Force

7. Which of the following is the tendency of an object to maintain its state of motion?
acceleration
inertia
force
velocity

8. An object with a mass of 100kg has what weight in Newtons?
9.8
980
500

9. With a constant applied force, mass is directly proportional to acceleration. This statement describes which of Newton’s Laws?
1st
2nd
3rd
None of the above

10. If a nonzero net force is acting on an object, then the object is definitely
at rest.
moving with a constant velocity.
being accelerated.
losing mass.

11. Which are simultaneously equal but opposite forces resulting from the interaction of two objects?
net external forces
field forces
gravitational forces
action-reaction pairs

12. What is not true regarding action reaction forces?
They are an application of Newton’s 3rd Law.
They act on the same object.
They act on different objects.
All are true.

13. The magnitude of the force of gravity acting on an object is
frictional force.
weight.
inertia.
mass.

14. In the terminology “a 500-N block”, the 500-N refers most specifically to the block's:
mass.
force.
weight.
None of the above.

15. It is generally easier to overcome friction when an object is moving than at rest because …
µk is greater than µs
µs is greater than µk
Fg increases when an object moves
Fg decreases when an object moves

16. As a car coasts on a level road yet slows down, the net force acting on the tires is:
greater than the normal force times the coefficient of static friction.
equal to the normal force times the coefficient of static friction.
the normal force times the coefficient of kinetic friction.
zero.

17. If an object changes its direction of motion:
the mass of the object had to change.
the inertia of the object had to change.
the speed of the object stays the same.
a force must have been applied to the object.

18. If no forces are acting on an object, its motion will:
continue in the same direction with the same speed.
slow down and eventually stop.
continue at the same speed but could change direction.
continue in the same direction but could change speed.

19. If the net force is negative and the speed is positive:
the speed will decrease over time.
the speed will increase over time.
the speed will stay the same.
the speed will immediately drop to zero.

20. Which of the following will not change as you increase the slope of a ramp?
Normal Force
Fgx
coefficient of friction
Fgy

21. Which of the following about an object on a ramp will increase if you decrease the slope of a ramp?
Frictional Force
Gravitational Force
Fgx
Coefficient of Friction

22. What happens to the normal force as the angle of a ramp increases?
Normal force increases
Normal force decreases
Normal force remains constant

23. What happens to the coefficient of friction as the angle of a ramp increases?
µ decreases
µ remains constant

24. The gravitational force on an object is 98N
The gravitational force on an object is 98N. What is the object’s mass in kg? 98
9.8
980 10

25. A 1000kg car is at rest on a slope of angle 10o
A 1000kg car is at rest on a slope of angle 10o. What equals the normal force? Fg
Fg sin10
Fg cos10
Fg tan10
FFr

26. A 1000kg car is at rest on a slope of angle 10o
A 1000kg car is at rest on a slope of angle 10o. What equals the frictional force? Fg
Fg sin10
Fg cos10
Fg tan10
FFr