AnswersTX-Physics AUnit Test

Universal Law of Gravitation Answers

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Physics students study a piano being pulled across a room on a rug. They know that when it is at rest, it experiences a gravitational force of 2200 N. When it is being pulled with 1200 N it is sliding across the room in equilibrium, but the students feel like they had to pull harder than 1200 N at first to begin motion.

A
The static and kinetic frictional forces are equal, so the static frictional force is equal to 1200 N.
B
The kinetic frictional force is greater than the static frictional force, so the kinetic frictional force is greater than 1200 N.
C
The static frictional force is greater than the kinetic frictional force, so the static frictional force is greater than 1200 N.
D
The static and kinetic friction are both equal to the gravitational force of 2200 N.
2
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A box is at rest on a ramp at an incline of 22°. The normal force on the box is 538 N.

A
202 N
B
217 N
C
499 N
D
580 N
3

A box is being pulled to the right. The free body diagram is shown.

Question illustration
A
25 N
B
125 N
C
375 N
D
500 N
4

Which describes a positive or negative net force acting on an object? Check all that apply.It can cause an object to accelerate.It can cause an object to stop moving.It can cause an object to start moving.It can cause an object to change directions.It can cause an object at rest to remain at rest.

A
It can cause an object to accelerate.
B
It can cause an object to stop moving.
C
It can cause an object to start moving.
D
It can cause an object to change directions.
E
It can cause an object at rest to remain at rest.
5

A box at rest is in a state of equilibrium half way up on a ramp. The ramp has an incline of 42° . What is the force of static friction acting on the box if box has a gravitational force of 112.1 N ?

A
70 N
B
80 N
C
75 N
D
85 N
6

20455075

A
20
B
45
C
50
D
75
7

JouleNewtonWatt

A
Joule
B
Newton
C
Watt
8

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.

A
35 N to the right
B
35 N to the left
C
865 N to the right
D
865 N to the left
9

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 upward force the book pulls on the Earth
C
the downward force the book pushes on the desk
D
the downward force the Earth pulls on the book
10

A moving object is in equilibrium. Which best describes the motion of the object if no forces change?

A
It will change directions.
B
It will slow down and stop.
C
It will maintain its state of motion.
D
It will speed up and then slow down.
11

A box is pulled to the right with a force of 65 N at an angle of 58 degrees to the horizontal. The surface is frictionless. The free body diagram is shown.

Question illustration
A
30 N
B
34 N
C
55 N
D
65 N
12

A framed picture hangs from two cords attached to the ceiling.Which shows the correct free body diagram of the hanging picture?

Question illustration
A
Option
B
Option
C
Option
D
Option
13

A bucket of water experiencing a gravitational force of 525 N is pulled up from a water well. The net force in the y-direction is 45 N; therefore, the magnitude of the force of tension is N.

Answer not available
14

A box is pushed down at an angle of 32 degrees on a rough surface. The box moves to the right.

Question illustration
A
F subscript net, y = F subscript N minus F subscript g.
Option A
B
F subscript net, y = F subscript p minus F subscript f.
Option B
C
F subscript net, y = F subscript N minus F subscript g minus F subscript p cos(32).
Option C
D
F subscript net, y = F subscript N minus F subscript g minus F subscript p sin(32).
Option D
15

What is the purpose of a free body diagram?

A
to show the velocity of an object
B
to show the acceleration of an object
C
to show the forces acting on an object
D
to show the direction of motion vectors of an object
16

A ball is dropped from rest from the top of a building. What force is responsible for the downward motion of the ball?

A
the force of gravity
B
the force of tension
C
the normal force
D
the pushing force
17

A box is being pulled to the right. What is the direction of the gravitational force?

A
up
B
down
C
right
D
left

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