Answers2025-26 DSST SR 73690 - Physics S1Unit Test

Unit Test — Unit test Answers

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The free-body diagrams of four objects are shown.

Question illustration
A
W
B
X
C
Y
D
Z
2
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According to Newton’s first law of motion, what will an object in motion do when no external force acts on it?

A
come to a stop
B
move at the same velocity
C
speed up
D
change direction
3

Newton’s third law of motion says that for every action there is a(n) and opposite reaction.

Answer not available
4

A sports car and a minivan run out of gas and are pushed to the side of the road. Which is easier to push, and why?

A
the minivan, because it has more mass and therefore more inertia
B
the minivan, because it has less mass and therefore less inertia
C
the sports car, because it has more mass and therefore more inertia
D
the sports car, because it has less mass and therefore less inertia
5

Which situation is contrary to Newton’s first law of motion?

A
An object at rest begins to move when an external force is applied.
B
A moving object has a constant velocity under the influence of balanced forces.
C
An object at rest stays at rest as long as unbalanced forces act on it.
D
A moving object slows down when an external force is applied.
6

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
Option
B
Option
C
Option
D
Option
7

Keisha writes that if an object has any external forces acting on it, then the object can be in dynamic equilibrium but not static equilibrium.Which statement best describes Keisha’s error?

A
An object that is not moving is always in static equilibrium.
B
An object that is moving must be in dynamic equilibrium.
C
An object in either state of equilibrium must have no forces acting on it.
D
An object in either state of equilibrium must have no net force acting on it.
8

A ball is dropped from the top of a building. It initially moves at 4.0 m/s. After 0.5 seconds, it moves at 3.8 m/s.

A
air resistance
B
gravity
C
normal
D
tension
9

A box experiencing a gravitational force of 600 N is being pulled to the right with force of 250 N. A 25 N frictional force acts on the box as it moves to the right.

A
0 N
B
25 N
C
225 N
D
250 N
10

Which statements describe an object in motion that has no external force acting on it? Check all that apply.It accelerates and speeds up.It moves at a constant speed.It decelerates and slows down.It changes direction.It moves in the same direction.

A
It accelerates and speeds up.
B
It moves at a constant speed.
C
It decelerates and slows down.
D
It changes direction.
E
It moves in the same direction.
11

Tracy stands on a skateboard and tosses her backpack to her friend who is standing in front of her. Which best describes the acceleration Tracy experiences?

A
It is less than the acceleration of the backpack because she has a greater mass.
B
It is greater than the acceleration of the backpack because she has a greater mass.
C
It is less than the acceleration of the backpack because she uses a smaller force.
D
It is greater than the acceleration of the backpack because she uses a larger force.
12

A cart is pulled by a force of 250 N at an angle of 35° above the horizontal. The cart accelerates at 1.4 m/s2. The free-body diagram shows the forces acting on the cart. The mass of the cart, to the nearest whole number, is kg.

Answer not available
13

Which quantity may be calculated directly using Newton’s second law of motion?

A
weight
B
velocity
C
position
D
direction
14

What is the mass of an object if a net force of 8.0 N causes it to accelerate at 1.1 m/s2?

A
6.9 kg
B
7.3 kg
C
8.8 kg
D
9.1 kg
15

The gravitational acceleration on Earth is 9.8 m/s2. What is the weight of a car on Earth (to the nearest whole number) if it has a mass of 1360 kg?

A
14 N
B
139 N
C
1333 N
D
13,328 N
16

How much force is needed to accelerate an object of mass 90 kg at a rate of 1.2 m/s2?

A
0.013 N
B
75 N
C
108 N
D
1080 N
17

John pushes Hector on a plastic toboggan.The free-body diagram is shown.

Question illustration
A
245 N
B
735 N
C
490 N
D
980 N
18

The weight of a bucket is 186 N. The bucket is being raised by two ropes. The free-body diagram shows the forces acting on the bucket. The acceleration of the bucket, to the nearest tenth, is m/s2.

Answer not available
19

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
20

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

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