Newton's Laws of Motion — Unit test Answers

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Which change will cause the gravitational force between a baseball and a soccer ball to increase?

A
removing the outer layer of the baseball
B
moving the balls farther apart
C
wrapping the soccer ball in layers of duct tape
D
using a baseball with a thinner leather
2
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Which refers to the force that one massive object exerts to attract another object?

A
velocity
B
gravity
C
acceleration
D
newton
3

Which refers to the sum of all the forces that act upon an object?

A
absolute force
B
net force
C
positive force
D
balanced force
4

The chart lists the masses and velocities of four objects.

Question illustration
A
W
B
X
C
Y
D
Z
5

Which example best represents balanced forces?

A
an elevator stopped on the third floor
B
a basketball shot into a hoop
C
a sled sliding down a snowy hill
D
a tow truck pulling a car out of a ditch
6

Anya knows the velocity of an object. What else does she need to know in order to find the object’s momentum?

A
its mass
B
its height
C
its density
D
its speed
7

Newton’s first law of motion was a giant leap forward in scientific thought during Newton’s time. Even today, the idea is sometimes difficult at first for people to understand.

A
A rolling ball eventually slows down and comes to a stop.
B
A wagon must be pushed before it begins to move.
C
The heavier the load in a cart, the harder the cart is to turn.
D
A box does not move when pushed equally from opposite sides.
8

An object has a mass of 5 kg. What force is needed to accelerate it at 6 m/s2? (Formula: F=ma)

A
0.83 N
B
1.2 N
C
11 N
D
30 N
9

A bicycle has a momentum of 36 kg • m/s and a velocity of 4 m/s. What is the mass of the bicycle?

A
9 kg
B
32 kg
C
40 kg
D
144 kg
10

Which statement correctly describes gravity?

A
an attractive force that acts between all objects through contact
B
an attractive force that acts between all objects without contact
C
a repulsive force that acts between all objects through contact
D
a repulsive force that acts between all objects without contact
11

A skydiver falls toward the ground at a constant velocity. Which statement best applies Newton’s laws of motion to explain the skydiver’s motion?

A
An upward force balances the downward force of gravity on the skydiver.
B
The skydiver’s inertia is zero, which no longer allows for acceleration.
C
An unbalanced force pulls the skydiver toward the ground.
D
The mass of the skydiver is so great that there is no acceleration.
12

Which would be represented by FN on a force diagram?

A
Northern Force
B
Newton Force
C
Normal Force
D
Negative Force
13

An object in projectile motion will follow which path?

A
curved up from the ground
B
curved down toward the ground
C
straight down toward the ground
D
straight up from the ground
14

Jerome solves a problem using the law of conservation of momentum. What should Jerome always keep constant for each object after the objects collide and bounce apart?

A
velocity
B
mass
C
momentum
D
direction
15

When discussing Newton’s laws of motion, which terms do people most likely use when talking about Newton’s third law of motion?

A
“force” and “acceleration”
B
“inertia” and “force”
C
“action” and “reaction”
D
“mass” and “inertia”
16

The resulting net force of an object is represented below. →10 NWhich most likely represent the forces acting on the object?

A
↑ 63 N and ↓ 73 N
B
↑ 97 N and ↓ 87 N
C
← 63 N and → 73 N
D
← 97 N and → 87 N
17

Which best describes two counteracting forces on an object?

A
using a dolly to push a box to another location
B
two children pulling apart a wishbone
C
a group of dogs pulling a dogsled across ice
D
two people pushing a broken-down car up the road
18

Luis and Aisha conducted an experiment. They exerted different forces on four objects. Their results are shown in the table.Based on the data, which object has the greatest acceleration?

Question illustration
A
Object 1
B
Object 2
C
Object 3
D
Object 4
19

When someone throws a ball, the action force is the person pushing on the ball. What is the reaction force?

A
the ball pushing on the person
B
the ball pushing against air
C
the ball being pulled toward the ground
D
the ball being pulled away from the person
20

Polly is pushing a box to the right across the floor with a force of 30 N. The force of gravity is 8 N, and the normal force is 8 N. Which value could describe the force of friction if Polly could not move the box?

A
Option
Option A
B
Option
Option B
C
Option
Option C
D
Option
Option D

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