Force Review Sheet
Physics, K. Merricks
Fill in the Blank:
First Law
1. According to Newton’s __________________________ law, an object with no net force acting on it
remains at rest or in motion with a constant velocity.
2. Losing speed as you ride your bike uphill demonstrates Newton’s __________
second law.
equal
3. If you push against a wall, the wall pushes back against you with ________________ force.
the force is also zero
4. An object is in equilibrium if (describe the force) ________________________________.
weight
5. The gravitational force exerted by a large body, such as Earth, is known as __________________.
acceleration of gravity
6. Mass and weight are related by ___________________________________.
7. If the weight of a balloon is 3000-N and the lift force provided by the atmosphere is 3300-N, in which
upward
direction is the net force acting? ___________________________________
8. When the drag force on an object equals the force of gravity, the object attains
terminal velocity
________________________.
True/False:
9. True/False: Newton’s second law can be written as the equation a= Fnet/m
10. True/False: The acceleration of an object and the net force acting on it are proportional.
11. True/False: Force and acceleration are scalar quantities.
Use the following choices to answer questions 12-19
a. g b. Newton c. weight d. 9.8-m/s2 e. weightlessness
f. mg g. Fg h. mass i. displacement j. FA
c 12. name of gravitational force acting on object
_____
d
_____ 13. magnitude of acceleration caused by gravity
a
_____ 14. symbol for the acceleration caused by gravity
g 15. symbol for the weight force
_____
f
_____ 16. expression for the weight of an object
b
_____ 17. unit of weight
h 18. property of an object that does not vary from location to location
_____
e
_____ 19. having an apparent weight of zero
Rewrite the italicized part to make the statement true.
20. The force of friction opposes the motion of an object sliding on a surface.
21. The force of friction acts in a direction that is perpendicular to the surface on which the object slides.
parallel
22. The force of friction acts in the same direction as the direction of the sliding object.
opposite
23. Static friction opposes the start of an object’s motion.
24. The static friction force does depend on the area of the surfaces in contact.
does not
25. The kinetic friction force does depend on the speed of the relative motion of the surfaces.
does not
Use the above diagram to answer the following questions:
26. Which part of the diagram 1 represents the weight force of the bowl sitting on a shelf?
a. A b. B c. C d. D
27. FN is a symbol that represents the _____________ force.
a. friction b. tension c. normal d. weight
28. Which part of diagram 2 best represents the bowl in equilibrium?
a. A b. B c. C d. D
29. The magnitude of the net force on the bowl in equilibrium is __________.
a. FN b. Fg c. 0 d. 2Fg
30. The agent of FN is _____________.
a. the bowl b. Earth c. friction d. the shelf
31. The agent of Fg is ____________________.
a. the bowl b. Earth c. friction d. the shelf
Complete the chart using the following diagram:
Force Magnitude Direction
Fbook 1 on book 2 40 N down
Fbook 2 on book 1 40 N up
Fbook 2 on desktop 50 N down
Fdesktop on book 2 50 N up
Fbooks 1 and 2 on desktop 90 N down
Fdesktop on books 1 and 2 90 N up
Complete the following problems:
32. What force is required to accelerate a 6.0-kg bowling ball at +2.0-m/s2?
33. What is the mass of a cat that weighs 30.0-N?
34. What is the tension in a rope that is supporting a 4.2-kg bucket?
35. A net force of +125-N acts on an object. Find the single force that will produce equilibrium.
36. The coefficient of sliding friction between a 78-kg box and a warehouse floor is .21. How much force is
needed to keep the box moving at a constant velocity across the floor?
37. A 65-kg roller-skater moves at a constant speed with a force of 75-N. What is the coefficient of friction
between the skater and the floor of the roller rink?
