Brakes acting on a train car is an example of

the net force on an object being equal to one force on the object.

the net force on an object being positive.

the net force on an object slowly increasing.

the net force an object remaining the same over time.

Finding the net force on an object is useful because

allows you to predict whether an object’s motion will change.

you can predict the direction of an object.

you can predict the next force that will act on an object.

you can tell how the forces acting on an object have changed over time.

The difference between balanced and unbalanced forces is that

balanced forces have a net force equal to 0 N, while unbalanced forces do not.

balanced forces are multiples of 5 N, while unbalanced forces are not.

balanced forces have a net force unequal to 0 N, while unbalanced forces are equal to 0 N.

balanced forces have multiple forces that are equal to the same number, while unbalanced forces do not.

Which of the following is NOT a component of Newton’s first law of motion?

An object in motion has a constant velocity unless acted on by a balanced force.

An object at rest stays at rest.

An object in motion stays in motion.

n object in motion has a constant velocity unless acted on by an unbalanced force.

The net force on an object that is at rest

changes depending on the location of the object.

is the result of unbalanced forces acting on the object.

depends on the balanced forces acting on the object.

What is most likely to happen to a moving object with a net force of 0 N?

It will continue to move with the same velocity.

It will come to a complete stop.

What is most likely to happen to a moving object with a net force of 0 N if an unbalanced force acts on it?

It will come to a complete stop.

It will continue to move with the same velocity.

Newton’s second law of motion states that an object’s acceleration is equal to

the net force on an object divided by its mass.

the mass of an object divided by its net force.

The net force of an object divided by its speed.

the speed of an object divided by its net force.

What are the three components of the equation for the second law of motion?

velocity, acceleration, and mass

force, velocity, and acceleration

Friction is an example of

a force that can be balanced or unbalanced.

a force that does not follow Newton’s second law of motion.

Which of the following describes the cause and effect relationship between gravity and falling objects?

Gravity causes objects to fall toward the center of Earth.

Gravity causes objects to repel from the center of Earth.

Gravity is caused by objects’ attraction to the center of Earth.

An object’s force is caused by gravity’s attraction to the center of Earth.

What is likely to happen to the way an object moves if gravitational forces on the object do not change?

The object will move in predictable ways.

The object will move in unpredictable ways.

The object will be pushed slightly away from Earth.

The object will be pulled closer to the center of Earth.

Which object has greater acceleration when acted on by gravitational forces? A 2 kg apple, a 7 kg bowling ball, or a 20 kg rock?

They all have the same acceleration when acted on by gravitational forces.

Why doesn’t a feather fall at the same rate as an apple?

Air resistance reduces an object’s downward acceleration and affects objects differently.

Feathers are too light to be affected by gravitational forces.

Gravitational forces affect different objects in different ways.

Air resistance increases an object’s downward acceleration and affects objects differently.

An orbit is a path that

an object in space follows around another object due to gravitational forces.

an object follows as gravitational forces act on it.

an object that is changing acceleration follows as it changes speed or direction.

connects two objects that are being affected by the same gravitational forces.

Why is the moon never pulled into the Earth despite gravitational forces that pull it toward Earth?

The moon moves forward fast enough so that it is never pulled into Earth.

The moon has enough of its own gravity to avoid being pulled to Earth.

The moon is so large that gravity repels it from Earth rather than pulls it.

The moon is pulled toward the sun with a force equal to Earth’s pull on it.

Gravitational forces that hold objects in space are also responsible for

the motions, groupings, and shapes of those objects.

the circular motion of all objects in space.

the formation of new landforms on Earth.

the motions, groupings, and shapes of objects on Earth.

Why do gravitational forces form structures in space?

Stars and planets have very large masses, so gravitational forces work over large distances.

Stars and planets have very small masses, so gravitational forces work over large distances.

Stars and planets have very large masses, so gravitational forces work over very short distances.

Stars and planets have very small masses, so gravitational forces work over very short distances.

Which of the following is true of the strength of gravitational forces between two objects at a distance?

Gravitational forces are stronger when objects are close and weaker when they are farther apart.

Gravitational forces are stronger near Earth and weaker near other objects.

Gravitational forces are the same regardless of the distance between the objects.

Gravitational forces are weaker when objects are close and stronger when they are father apart.

Which of the following is true of the strength of gravitational forces between two objects in relation to mass?

Gravitational forces are greater when objects have a large mass.

Gravitational forces are weaker when objects have a large mass.

Gravitational forces are greater when objects have a small mass.

Gravitational forces are the same regardless of the mass of the objects.

the force on an object if the object were placed in any location in space.

the orbit of an object in space.

the force on an object if the object were placed in any location on Earth.

the force on an object if the object had no gravitational forces acting on it.

An object's weight measures

the amount of gravitational force on an object.

the amount of matter in an object.

the location of an object in a gravitational field.

the distance between an object and the center of Earth.

An object’s mass measures

the amount of matter in an object.

the amount of gravitational force on an object.

the location of an object in a gravitational field.

the distance between an object and the center of Earth.

Why do astronauts in a space station in orbit not hit the floor of the space station?

The astronauts and the space station fall to Earth at the same rate.

There is no gravitational force working on the astronauts.

The astronauts’ masses are too small to be affected by the pull of Earth’s gravity.

The astronauts are protected from the pull of gravitational forces by the space station.

Forces Review

Authored by Kyle Asmus

Science

8th Grade

NGSS covered

Used 233+ times

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42 questions

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MULTIPLE CHOICE QUESTION

30 sec • 1 pt

In science, force refers to

a moving object.

the way objects interact.

a push or pull on an object.

a description of an objects movement.

Tags

NGSS.MS-PS2-2

NGSS.MS-PS2-1

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

When do forces always occur?

when two objects interact

when two objects are in motion

when one object is larger than another

when two objects are of the same size

Tags

NGSS.MS-PS2-4

NGSS.MS-PS2-1

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

Forces are described using

speed and direction.

motion and distance.

strength and direction.

strength and distance.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

Which unit is used to measure the strength of forces?

kilowatt (kW)

megajoule (MJ)

newton (N)

pascal (Pa)

Tags

NGSS.MS-PS2-1

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

Different strengths of forces can be modeled using

arrows of different lengths.

scales that measure different forces.

a table of different numerical values.

a graph of different numerical values.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

Newton’s third law of motion states that when an object exerts a force on a second object, the second object

exerts a weaker force in the opposite direction.

exerts a stronger force in the opposite direction.

exerts a force with equal strength in the same direction.

exerts a force with equal strength in the opposite direction.

Tags

NGSS.MS-PS2-1

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

In the example of a swimmer interacting with a wall, the swimmer

exerts a force on the wall only.

exerts no force on any object.

exerts a force on herself only.

exerts a force on both herself and the wall.

Tags

NGSS.MS-PS2-1

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Forces Review

In science, force refers to

When do forces always occur?

Forces are described using

Which unit is used to measure the strength of forces?

Different strengths of forces can be modeled using

Newton’s third law of motion states that when an object exerts a force on a second object, the second object

In the example of a swimmer interacting with a wall, the swimmer

The net force on an object is found by...(same direction)

The net force of forces 15 N and 30 N is ______. (in the same direction)

For forces acting in opposite directions, the net force is found by

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