AnswersPhysics Sem 1 2025-2026Unit Test

Unit Test — Unit test Answers

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1
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Newton’s third law of motion says that for every action there is a(n) and opposite reaction.

Answer not available
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

The free-body diagrams of four objects are shown.

Question illustration
A
W
B
X
C
Y
D
Z
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

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
6

Julie sits on a swing. Her free-body diagram is shown.The net force on Julie is N.

Answer not available
7

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.
8

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
9

A box that has a mass of 80 kg slides down a ramp with a 30 degree angle. The free-body diagram shows the forces acting on the box.

Question illustration
A
0.5 m/s2
B
4.9 m/s2
C
8.5 m/s2
D
9.8 m/s2
10

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.
11

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
12

Devon has several toy car bodies and motors. The motors have the same mass, but they provide different amounts of force, as shown in this table.The bodies have the masses shown in this table.

Question illustration
A
motor 1, with body 1
B
motor 1, with body 2
C
motor 2, with body 1
D
motor 2, with body 2
13

A box is sitting on the floor. The box was then pulled with a force, Ft. The box did not move. The free-body diagram of the box is shown.

Question illustration
A
It is moving up with a net force of 20 N.
B
It is moving to the right with a net force of 10 N.
C
It is in dynamic equilibrium with a net force of 0 N.
D
It is in static equilibrium with a net force of 0 N.
14

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
15

Chang sees the following formula on a website about Newton’s second law. a =

Question illustration
A
He needs to find the net force acting on the object in a direction.
B
He needs to use only forces acting in the direction of motion.
C
He needs to combine the horizontal and vertical forces.
D
He needs to multiply the horizontal and vertical forces.
16

Which formula is used to calculate the mass of an object if the force and acceleration are known?

A
m = Fa
B
m =
Option B
C
m =
Option C
D
m = F – a
17

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
18

Juan draws a free-body diagram of an object that is in dynamic equilibrium moving to the left.

Question illustration
A
X: 45 NY: –45 N
B
X: –45 NY: 30 N
C
X: 30 NY: –45 N
D
X: 30 NY: –30 N
19

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
20

Newton’s second law of motion states that the acceleration of an object is proportional to the net force acting on it.

Answer not available

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