Physics Chapter 4 Assessment



APP1 Chapter 4 Test Review: FORCE CLASS SET!!!!!!

Match the short definition/concept with the appropriate term:

1. Change the acceleration of a mass by a push or a pull. a. acceleration

2. An object at rest, remains at rest…. b. Newton

3. affected by a change in gravity. c. force

4. not affected by a change in gravity. d. Kinetic friction

5. resistance to movement. e. weight

6. overcoming resistance of a moving object. f. coefficient of friction

7. “Father of Physics”

g. mass

h. Mr. Garcia

i. Static friction

j. Inertia

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8. What is the 1st Law of Motion?

9. What is the 2nd Law of Motion?

10. What is the 3rd Law of Motion?

11. What is a Newton?

12. A force of 25 N is applied to an object whose mass is 50.0 kg. What is the acceleration of the mass?

13. What is the weight of an object whose mass is 22.2 kg?

14. An object sits on a flat surface. What would be the static friction of the object if its weight is 15 N and whose coefficient of friction is 0.030?

15. You are given the distance, time, mass, initial velocity of 0 m/s. What is the force?

16. Show via a diagram how the normal force is equal to the weight.

17. You give to a 64.3 kg rock on the ground a force of exertion of 85.5 N? What is acceleration you place on the rock? (coefficient of static friction is 0.20.)

18. A mother pushes her baby buggy with a force of 65 N at an angle of 25º to the horizontal.

a. What is the horizontal component of the force she exerts?

b. What is the vertical component of the force she exerts?

19. A disposal truck has a mass of 3566 kg. If the truck can exert a constant force of 2055 N, how long would it take to increase the speed of the truck from rest to 10 m/s? (Disregard friction.).

20. Two forces act perpendicular to one another on an object at the same time. One force acts upward by a magnitude of 35 N. The other force acts to the right by a magnitude of 65 N. What is the magnitude of the resultant?

21. A force of 15.5 N acts on a 35 kg mass for a period of 3.5 seconds. If the mass starts from rest, how far will it travel as a result of the force?

22. What is the coefficient of kinetic friction if a force of 76 N is applied to keep a 66.9 kg body in motion, on a flat surface, when the force is applied at an angle of 15º?

23. An object with a mass of 123 kg has its initial velocity of 2.5 m/s changed to 28.8 m/s over a period of 2.4 minutes. How much force is applied to accomplish this change?

24. If you press a book flat against a vertical wall with your hand, in what direction is the friction force exerted by the wall on the book?

25. What is the difference between a field force and a contact force? Give an example of each. What are the four fundamental forces?

APP1 Chapter 4 Test Review: FORCE (ANSWERS)

1. C

2. J

3. E

4. G

5. I

6. D

7. B

8. Inertia: an object in motion stays in motion and an object at rest stays at rest

9. F=ma: changing an objects acceleration requires a non-zero net force

10. Action-Reaction: for every action there is an equal, but opposite, reaction

11. 1 N = 1 kgm/s2

12. 0.50 m/s2

13. 218 N

14. 0.45 N

15. [pic]

16. [pic]

17. a=0 because this force is not enough to overcome the force of static friction

18. x= 59N; y=27N

19. 17 s (use v=vo+at)

20. 74 N

21. 2.7 m (use ∆x=vot + .5at2)

22. 0.11 (f=µFN; use sum of the forces on x and y so f=76cos15; FN=mg-76sin15)

23. 22 N (use: v = vo + at)

24. Upward because it would be resisting force of gravity

25. Field force is when there is force acting between objects that are not touching (gravity, electromagnetic) whereas contact forces occur when objects do touch (friction); the four fundamental forces are Gravitational, Electromagnetic, Strong Nuclear Force, and Weak Nuclear Force (the latter two we do not study in this class.)

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