AnswersSY2025-26 - 2002040 MJ Comprehensive Science 1 Sem 1 CRUnit Test

Introduction to Motion Answers

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1
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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 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
3

Tisa makes a diagram to organize her notes about charging objects.

Question illustration
A
Electrons move between objects.
B
The objects do not touch.
C
The objects develop opposite charges.
D
The objects have the same charge.
4

How does increasing the distance between charged objects affect the electric force between them?

A
The electric force increases because the distance has an indirect relationship to the force.
B
The electric force increases because the distance has a direct relationship to the force.
C
The electric force decreases because the distance has an indirect relationship to the force.
D
The electric force decreases because the distance has a direct relationship to the force.
5

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
6

Which factors can affect the amount of friction acting on an object on a solid surface?

A
the weight of the object and the force of a push
B
the type of surface and the weight of the object
C
the force of a push and the motion of the object
D
the motion of the object and the type of surface
7

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
8

While drilling metal, Ben poured oil over the area. Which best explains why he did this?

A
Ben was trying to reduce fluid friction.
B
Ben was trying to reduce kinetic friction.
C
Ben was trying to increase fluid friction.
D
Ben was trying to increase kinetic friction.
9

How are the magnetic field lines near the south pole of a magnet affected when a second south pole is brought near it?

A
The field lines combine with the lines around the second south pole.
B
The field lines overlap with the lines from the second south pole.
C
The field lines bend toward the second south pole.
D
The field lines bend away from the second south pole.
10

A bar magnet is cut in half, as shown. Which shows the pieces after the magnet is cut?

Question illustration
A
2 pieces of broken magnet with a jagged edge on the inside side of each piece. On the left a piece labeled N S from left and on the right a piece labeled N S from left.
Option A
B
2 pieces of broken magnet with a jagged edge on the inside side of each piece. On the left a piece labeled N S from left and on the right a piece labeled S N from left.
Option B
C
2 pieces of broken magnet with a jagged edge on the inside side of each piece. On the left a piece labeled N and on the right a piece labeled S.
Option C
D
2 pieces of broken magnet with a jagged edge on the inside side of each piece. On the left a piece labeled S and on the right a piece labeled N.
Option D
11

Which refers to the force that one massive object exerts to attract another object?

A
velocity
B
gravity
C
acceleration
D
newton
12

The image shows the electric field lines around two charged particles.

Question illustration
A
1
B
2
C
3
D
4
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

Which would be represented by FN on a force diagram?

A
Northern Force
B
Newton Force
C
Normal Force
D
Negative Force
15

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
16

Which will a positively charged object attract?

A
an object that has a negative charge
B
an object that has a smaller positive charge
C
an object that has no charge
D
an object that has a larger positive charge
17

Which is an example of sliding friction?

A
a car’s wheels rolling down the road
B
a bird flying through the air
C
a child applying the brakes on his bike
D
a bowling ball rolling down a lane
18

Which may result from an increase in friction?

A
decreased traction
B
increased speed
C
reduced wear and tear
D
generation of heat
19

Which statement correctly describes Earth’s magnetic field?

A
A compass can lead a hiker to the geographic North Pole.
B
The magnetic pole near the South Pole is a north pole.
C
Compasses point toward a magnetic pole that is a north pole.
D
Field lines circle Earth from east to west.
20

An object that is made of which material is likely to be attracted to a magnet?

A
nitrogen
B
nickel
C
paper
D
plastic

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