AnswersPhysicsIntroduction to Forces

Introduction to Forces — Quiz Answers

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1
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Which describes a positive or negative net force acting on an object? Choose four correct answers.

A
It can cause an object to change directions.
B
It can cause an object at rest to remain at rest.
C
It can cause an object to start moving.
D
It can cause an object to accelerate.
E
It can cause an object to stop moving.
3
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A moving object is in equilibrium. Which best describes the motion of the object if no forces change?

A
It will maintain its state of motion.
B
It will change directions.
C
It will slow down and stop.
D
It will speed up and then slow down.
4

A ball is falling at terminal velocity. Terminal velocity occurs when the ball is in equilibrium and the forces are balanced. Which free body diagram shows the ball falling at terminal velocity?

A
Image with description A free body diagram with one force pointing downward labeled F Subscript g Baseline 20 N.
B
Image with description A free body diagram with 2 forces. The first pointing downward labeled F Subscript g Baseline 20 N and the second pointing upward labeled F Subscript air Baseline 5 N.
C
Image with description A free body diagram with 2 forces: the first pointing downward labeled F Subscript g Baseline 20 N and the second pointing upward labeled F Subscript air Baseline 30 N.
D
Image with description A free body diagram with 2 forces: the first pointing downward labeled F Subscript g Baseline 20 N and the second pointing upward labeled F Subscript air Baseline 20 N.
5

A box at rest is in a state of equilibrium half way up on a ramp. The ramp has an incline of 42 degrees What is the force of static friction acting on the box if box has a gravitational force of 112 point 1 cap n ?

A
75 cap n
B
70 cap n
C
80 cap n
D
85 cap n
6

A box experiencing a gravitational force of 600 cap n is being pulled to the right with force of 250 cap n A 25 cap n frictional force acts on the box as it moves to the right. What is the net force in the y -direction?

A
250 cap n
B
225 cap n
C
25 cap n
D
0 cap n
7

A book is sitting on a desk. What best describes the normal force acting on the book?

A
the upward force the desk pushes on the book
B
the downward force the book pushes on the desk
C
the downward force the Earth pulls on the book
D
the upward force the book pulls on the Earth
8

What is the purpose of a free body diagram?

A
to show the velocity of an object
B
to show the forces acting on an object
C
to show the direction of motion vectors of an object
D
to show the acceleration of an object
9

Two teams are playing tug of war. Team A pulls to the right with a force of 450 N. Team B pulls to the left with a force of 415 N. What is the net force on the rope, and what is its direction?

A
35 N to the left
B
865 N to the right
C
865 N to the left
D
35 N to the right
10

A ball is dropped from the top of a building. It initially moves at 4 point 0 m/s After 0 point 5 seconds, it moves at 3 point 8 m/s What force is responsible for the slowing of the ball?

A
gravity
B
air resistance
C
normal
D
tension

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Introduction to Forces — Quiz Answers — Physics