  Name:    9th Grade Physics- Force Practice Test 2

Multiple Choice
Identify the choice that best completes the statement or answers the question.

1.

Which of the following is NOT an example of a force?
 a. A push on the pedals of a bike causing it to move forward. c. A fisherman pulling up an anchor from the bottom of the sea. b. An arrow that keeps moving once it is set in motion. d. A push that causes a skateboard to move.

2.

Inertia
 a. two surfaces with opposing motion c. push or pull b. the tendency of an object to resist being moved or change in speed d. the product of the mass and velocity

3. Find the force applied to the object above.
 a. 4 N c. 16 N b. 1/4 N d. 2 N

4. Find the force applied to the object above.
 a. 20 N c. 4 N b. 1/4 N d. 100 N

5. An acorn falls from an oak tree branch and hits the ground.  As it falls to the ground, identify at which point(s) the force of gravity acts on the acorn.
 a. A c. C b. B d. A, B, and C

6.

A player runs to first base, if the student does 1000 joules of work in 4 seconds it took him to reach first from home plate, how much power did the player use?
 a. 1004 watts c. 250 watts b. 0.004 watts d. 4000 watts

7.

An ice skater is able to skate on ice due to the pressure placed on the ice by the thin blade melting the ice creating a thin layer of water on the sheet of ice.  This creates less ____________ allowing the skater to glide across the ice very easily.
 a. torque c. inertia b. momentum d. friction

8. Four different students, student A, B,C, and D, pull from four different directions.  Which student will end up pulling the blue square in their direction?
 a. Student A c. Student C b. Student B d. Student D

9.

A student balances his bike at a stoplight, completely stopped.  The student will roll forward when
 a. an unbalanced force with a net force on the pedals in a forward direction. c. the balanced force acts on the pedals. b. two opposing forces act on the pedals, so that the net force is zero. d. the inertia pushes the bike forward

10. Find the mass of the object above.
 a. 25 m/s/s c. 5 m/s/s b. 1/5 m/s/s d. 125 m/s/s

11.

A girl is riding her bike on a flat road when her boy friend on another bike comes up behind her and pushes, or adds an unbalanced force in the same direction as the girl riding the bike.  The girl’s speed will
 a. decrease c. stay the same b. increase

12.

A student pushes her little brother in a wagon with a force of 20 Newton’s for about 200 meters, Calculate the amount of work.
 a. 400 joules c. 1/10 joule b. 10 joules d. 4000 joules

13.

A student pushes a box across the floor with a force of 20 Newton’s, and in doing so does 1000 joules of work.  How far did the student push the box?
 a. 20,000 meters c. 1020 meters b. 0.02 meters d. 50 meters

14.

 Car Mass (kg) Force (N) A 2 20 B 4 20 C 6 20 D 8 20
Analyze the table above to determine the car with the LEAST amount of acceleration.
 a. A c. C b. B d. D

15. Determine the resulting force from the diagram above.
 a. 50 N net force to the right c. 5 N net force to the right b. 2 N net force to the right d. 15 N net force to the right

16.

Force
 a. product of mass and velocity c. tendency to resist motion b. push or pull d. two surfaces with opposing motion

17. Find the mass of the object above.
 a. 2 kg c. 1/2 kg b. 72 kg d. 12 kg

18.

 Car Mass (kg) Force (N) A 10 10 B 10 20 C 10 30 D 10 40
Analyze the table above to determine the car with the MOST amount of acceleration.
 a. A c. C b. B d. D

19. Find the mass of the object above.
 a. 1/2 m/s/s c. 242 m/s/s b. 2 m/s/s d. 22 m/s/s

20.

Momentum
 a. the product of the mass and velocity c. two surfaces with opposing motion b. the tendency of an object to resist motion d. push or pull

21.

Work done in a given amount of time is called
 a. Force c. Mass b. Power d. Volume

22. Find the mass of the object above.
 a. 5 kg c. 20 kg b. 1/5 kg d. 10 kg

23. Find the force applied to the object above.
 a. 20 N c. 2 N b. 10 N d. 5 N

24. Find the mass of the object above.
 a. 98 m/s/s c. 2 m/s/s b. 14 m/s/s d. 1/2 m/s/s  