Answers SY2025-26 - 2002040 MJ Comprehensive Science 1 Sem 1 CRUnit Test

Introduction to Motion Answers

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

removing the outer layer of the baseball

moving the balls farther apart

wrapping the soccer ball in layers of duct tape

using a baseball with a thinner leather

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Which statement correctly describes gravity?

an attractive force that acts between all objects through contact

an attractive force that acts between all objects without contact

a repulsive force that acts between all objects through contact

a repulsive force that acts between all objects without contact

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

Electrons move between objects.

The objects do not touch.

The objects develop opposite charges.

The objects have the same charge.

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

The electric force increases because the distance has an indirect relationship to the force.

The electric force increases because the distance has a direct relationship to the force.

The electric force decreases because the distance has an indirect relationship to the force.

The electric force decreases because the distance has a direct relationship to the force.

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

absolute force

net force

positive force

balanced force

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

the weight of the object and the force of a push

the type of surface and the weight of the object

the force of a push and the motion of the object

the motion of the object and the type of surface

Which example best represents balanced forces?

an elevator stopped on the third floor

a basketball shot into a hoop

a sled sliding down a snowy hill

a tow truck pulling a car out of a ditch

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

Ben was trying to reduce fluid friction.

Ben was trying to reduce kinetic friction.

Ben was trying to increase fluid friction.

Ben was trying to increase kinetic friction.

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

The field lines combine with the lines around the second south pole.

The field lines overlap with the lines from the second south pole.

The field lines bend toward the second south pole.

The field lines bend away from the second south pole.

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

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.

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.

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.

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.

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

velocity

gravity

acceleration

newton

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

An object in projectile motion will follow which path?

curved up from the ground

curved down toward the ground

straight down toward the ground

straight up from the ground

Which would be represented by FN on a force diagram?

Northern Force

Newton Force

Normal Force

Negative Force

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

↑ 63 N and ↓ 73 N

↑ 97 N and ↓ 87 N

← 63 N and → 73 N

← 97 N and → 87 N

Which will a positively charged object attract?

an object that has a negative charge

an object that has a smaller positive charge

an object that has no charge

an object that has a larger positive charge

Which is an example of sliding friction?

a car’s wheels rolling down the road

a bird flying through the air

a child applying the brakes on his bike

a bowling ball rolling down a lane

Which may result from an increase in friction?

decreased traction

increased speed

reduced wear and tear

generation of heat

Which statement correctly describes Earth’s magnetic field?

A compass can lead a hiker to the geographic North Pole.

The magnetic pole near the South Pole is a north pole.

Compasses point toward a magnetic pole that is a north pole.

Field lines circle Earth from east to west.

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

nitrogen

nickel

paper

plastic

The city is using sand trucks to place sand on the road during icy conditions. Which best explains the use of sand?

The sand increases friction by increasing surface area.

The sand increases friction by increasing roughness.

The sand decreases friction by increasing surface area.

The sand decreases friction by increasing roughness.

Alfredo makes a diagram to organize his notes about charging objects.

It does not involve touching the objects together.

The objects develop opposite charges.

Electrons do not move between objects.

The objects have the same charge.

Two bar magnets are hung from metal rods and held in the position shown below. The magnets are released and swing freely. Which diagram best predicts their final position?

A rectangular box with 2 black lines running down from it, each to a horizontal bar magnet labeled N to the left and S to the right. There is a gap between the magnets. The magnets are both hanging to the left.

A rectangular box with 2 black lines running down from it, each to a horizontal bar magnet labeled N to the left and S to the right. There is a gap between the magnets. The left magnet hangs to the left. The right magnet hangs to the right.

Which force best represents Fg?

A weight lifter is pushing a barbell upward with a force of 90 N.

The weight of a barbell acting on a weight lifter is 80 N.

The amount of upward force of a table on a box is 25 N.

A box on a rough table has difficulty sliding past 25 N of force.

Jill uses a magnet to pick up a nail. Then, she touches the nail to a paper clip and picks up the paper clip. What will most likely happen when she pulls the magnet away from the nail?

The paper clip will stay attached to the nail because the nail is now a permanent magnet.

The paper clip will stay attached to the nail because the paper clip is now a permanent magnet.

The paper clip will fall off of the nail because the nail was only a temporary magnet.

The paper clip will fall off of the nail because the nail is now magnetized in the opposite direction.

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