Download Chapter 4 Review Sheet

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Chapter 4 Review
1. What is a force?
2. Is force a scalar or a vector quantity? Explain your answer
3. What is the unit of force?
4. What is the difference between a balanced and an unbalanced (net) force? Which type of force
causes a change in motion?
5. Describe the possible motions of an object experiencing a balanced force.
6. Name and describe the two major categories of forces. Then give a real world example of each
type of force.
7. Name the nine major categories of forces and classify them as one of the two types you listed
above.
8. What is Newton’s First Law? Give an example.
9. What is inertia?
10. How are mass and inertia related?
11. What is Newton’s Second Law?
12. How are mass and acceleration related?
13. How are force and acceleration related?
14. Determine the accelerations that result when a 50-N net force is applied to a 300-kg object.
15. Determine the force needed to stop a 56 kg object with an initial velocity of 10 m/s in 5 seconds.
16. What is Newton’s Third Law?
17. Give a real world example of Newton’s Third Law (an action-reaction force pair)
18. What can be said about the size and direction of the forces in a force pair?
19. Complete the following sentence: “Forces don’t cause _____________________________ they
cause _______________________________.”
20. Determine the net force on the following free body diagrams
21. Draw free body diagrams for the following situations:
a. A car being pushed to the right
b. An elevator that is being pulled up an elevator shaft by a cable.
22. What are the names of the four fundamental forces? What is the strongest force? What is the
weakest force?
23. What is terminal velocity?
24. What is the weight of a 250 kg object?
25. The object in problem 24 is put onto a 39° incline. Calculate the normal force and the net force
on the object.
26. Calculate the acceleration of this object.
27. How would the net force and acceleration of this object be different if the object were on a
frictional surface with a μk= 0.61
28. What is the difference between kinetic friction and static friction?
29. A 65 kg object initially at rest on a horizontal surface requires a 52 N horizontal force to set it in
motion. Find the coefficient of static friction between the object and the floor.
30. A pulls a 10 kg wagon with a force of 15 N at an angle of 20° above the horizontal. If the μ k of the
wagon is 0.12, what is the acceleration of the wagon?