Name:    9th Grade Physics- Force Practice Test 3

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

1.

One force pulls from the left at 10 N, and one force pulls in the opposite direction at 5 N.  What is the net force and in which direction?
 a. Left, 15 N c. Left, 5 N b. Right, 15 N d. Right, 5 N

2.

Find the mass of the object above.
 a. 1/6 m/s/s c. 12 m/s/s b. 6 m/s/s d. 24 m/s/s

3.

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

4.

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

5.

Find the mass of the object above.
 a. 1/4 kg c. 16 kg b. 8 kg d. 4 kg

6.

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. 4000 joules c. 10 joules b. 400 joules d. 1/10 joule

7.

 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 MOST amount of acceleration.
 a. A c. C b. B d. D

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.

Find the force applied to the object above.
 a. 24 N c. 4 N b. 1.5 N d. 2/3 N

10.

The product of the mass and velocity
 a. inertia c. force b. momentum d. friction

11.

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

12.

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. 4000 watts c. 0.004 watts b. 250 watts d. 1004 watts

13.

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

14.

Find the mass of the object above.
 a. 2 kg c. 1/2 kg b. 50 kg d. 10 kg

15.

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

16.

A force that opposes motion between two surfaces that are in contact
 a. force c. momentum b. friction d. inertia

17.

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

18.

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. inertia c. friction b. momentum d. torque

19.

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

20.

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

21.

Friction maybe defined as the
 a. the tendency of a force to rotate an object about an axis. c. influence that causes an object to  change in speed, change in direction, or change in shape. b. the resistance of any object to a change in its state of motion or rest. d. resisting the motion of solid surfaces, fluid layers, and/or objects sliding against each other.

22.

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

23.

Find the force applied to the object above.
 a. 20 N c. 40 N b. 1/10 N d. 10 N

24.

A 10kg, 20 kg, and a 30 kg ball fall in a vacuum tube from the same height, with no air resistance.  Which object(s) will fall the fastest?
 a. 10 kg c. The 10 kg, 20 kg, and 30 kg will fall at the same rate b. 20 kg d. 30 kg

25.

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

26.

 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

27.

When two forces act in the same direction the net force is
 a. divided by the two forces c. the difference of the two forces b. the sum of the forces d. multiplied by the two forces

28.

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. increase b. stay the same

29.

An object exerts 25 Newton’s onto the surface of a table, how much Force is exerted upward by the table?
 a. Not enough information c. 20 N b. 25 N d. 0 N

30.

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. 0.02 meters b. 1020 meters d. 50 meters

31.

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

32.

A push or pull exerted on an object
 a. momentum c. force b. friction d. inertia

33.

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. An arrow that keeps moving once it is set in motion. b. A push that causes a skateboard to move. d. A fisherman pulling up an anchor from the bottom of the sea.

34.

Each year scouts compete in soap box derby races.  The races consist of a wooden car with four wheels.  The car rolls down hill with out the aide of anything but gravity.  The winners always have well lubricated axles and or bearings.  The lubrication helps prevent __________ which speeds the car up.
 a. torque c. inertia b. momentum d. friction

35.

Find the mass of the object above.
 a. 1/6 m/s/s c. 6 m/s/s b. 24 m/s/s d. 96 m/s/s

36.

A student pushes a cart down a road with a force of 10 Newton’s, and in doing so does 500 joules of work.  How far did the student push the box?
 a. 510 meters c. 5,000 meters b. 50 meters d. 0.02 meters

37.

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

38.

 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 LEAST amount of acceleration.
 a. A c. C b. B d. D

39.

Find the force applied to the object above.
 a. 2/5 N c. 2.5 N b. 2 N d. 10 N

40.

Determine the resulting force and direction for the diagram above.
 a. The object will move right with 10 N of force c. The object will stay in the same place with 10 N net force b. The object will move left with 10 N of force d. The object stays in the same place, 0 N net force

41.

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

42.

A student pushes her friend on a skateboard with a force of 40 Newton’s for about 50 meters, Calculate the amount of work.
 a. 1.25 joules c. 2000 joules b. 10 joules d. 0.8 joules

43.

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

44.

 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

45.

A student helps his mother bring groceries into the house from the car, if the student does 500 joules of work in 4 seconds, how much power did the student use?
 a. 2000 watts c. 504 watts b. 125 watts d. 0.008 watts

46.

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

47.

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

48.

The tendency of an object to resist being moved or change in speed
 a. inertia c. friction b. force d. momentum