What happens when balanced forces act on an object at rest? ¿Qué sucede cuando las fuerzas equilibradas actúan sobre un objeto en reposo?

The object will remain at rest.

The object will push back with a greater force.

A student pushes a box to slide it across the floor. Which statement best explains why the box begins to move? Un estudiante empuja una caja para deslizarla por el suelo. ¿Qué enunciado explica mejor por qué la caja comienza a moverse?

The applied force is greater than the force of friction.

The applied force is less than the force of friction.

The weight of the box is greater than the force of friction.

The weight of the box is less than the force of friction.

Which of the following is an example of balanced forces? ¿Cuál de los siguientes es un ejemplo de fuerzas equilibradas?

A truck beginning to accelerate.

What happens to an object if the sum of the forces acting on it is greater than zero? ¿Qué le sucede a un objeto si la suma de las fuerzas que actúan sobre él es mayor que cero?

The motion of the object will change.

The object will not be affected.

The motion of the object will remain the same.

Which statement about an object in motion is correct? ¿Qué enunciado sobre un objeto en movimiento es correcto?

An object in motion will remain in motion until it experiences an unbalanced force.

An object in motion will remain in motion and continue accelerating indefinitely.

An object in motion will always slow down over time.

An object in motion will always eventually stop.

A brick is resting on a smooth, level surface. A student applies a force of 5 N to the brick in order to move it to the right. The magnitude of the force of friction on the brick is also 5 N. Which statement best describes the effect of these two forces on the brick?

The net force on the brick is 0 N, and the brick remains at rest.

The net force on the brick is 0 N, and the brick begins to move.

The net force on the brick is 10 N toward the right, and the brick begins to move.

The net force on the brick is 10 N toward the right, and the brick remains at rest.

Student 1 rides in a moving car and observes a bus traveling east. She estimates that it is traveling at a rate of 20 kilometers per hour (km/h). Student 2 is standing on the sidewalk and observes the same bus at the same time. She estimates that it is moving east at a rate of 50 km/h. Which best explains this difference?

All motion is relative to the frame of reference chosen for measurement.

Acceleration and velocity have different values because they are different measures of motion.

Measurement error causes multiple observations of motion to conflict.

Velocity varies with the compass direction of motion.

Which statement describes the velocity of a bus traveling along its route? ¿Qué enunciado describe la velocidad de un autobús que viaja a lo largo de su ruta?

The bus travels at 20 mph east.

The bus travels at 20 mph for 30 minutes.

The bus makes three left turns during its route.

The bus travels at an average of 20 mph.

Evelyn drives her car down the road until she comes to a stop sign. She then applies the brakes to stop the car. Which statement best describes what happens next?

Acceleration decreases velocity until the car stops.

Acceleration no longer exists as the car stops.

Acceleration remains constant while friction causes the car to stop.

Acceleration increases velocity until the car stops.

Which phrase best defines speed? ¿Qué frase define mejor la velocidad?

The distance traveled by an object in a certain time.

The force on an object divided by the object's mass.

The distance traveled by an object at a certain velocity.

The mass of an object multiplied by its acceleration.

A swimmer reaches the end of the pool, turns around, and pushes off the wall with her feet. Which pair of action-reaction forces is exerted during the push?

The force of the swimmer's feet on the wall and the force of the wall on her feet.

The force of gravity on the swimmer's body and the force of the wall on her feet.

The force of the swimmer's feet on the wall and the force of the water on her front.

The force of gravity on the swimmer's body and the force of her feet on the wall.

If you push a bowling ball and a golf ball with equal force, what will happen? Si empuja una bola de boliche y una de golf con la misma fuerza, ¿qué pasará?

The acceleration of the golf ball will be greater than that of the bowling ball.

The acceleration of both balls will be equal and nonzero.

The acceleration of the bowling ball will be greater than that of the golf ball.

The acceleration of both balls will be zero.

You are sitting in a chair and not moving. What is happening? Estás sentado en una silla y no te mueves. ¿Lo que está sucediendo?

Your body is exerting a force on the chair, and the chair is exerting an equal force on your body.

Your body is exerting a force on the chair, but nothing else is happening.

Neither you nor the chair is moving, so there are no forces at work.

The chair is exerting a force on your body, but nothing else is happening.

Which statement describes Newton’s third law?

For every action, there is an equal and opposite reaction.

The greater the mass, the greater the amount of force needed to set it in motion.

An object at rest will remain at rest unless acted on by an unbalanced force.

Acceleration is produced when a force acts on a mass.

What happens when you push on the wall of a building?

The wall pushes back with a force equal in size and opposite in direction.

The wall is pushed in the same direction as the force of your push.

The wall is larger than you, so no force is exerted.

The wall remains stable, because force does not work on inanimate objects.

To swim forward in water, your arms push against the water with a force. What does the water do?

It pushes against your arms with an equal and opposite force.

It does not push against your arms, and that is how you move forward.

It pushes against your arms with a greater force, causing you to move forward.

It pushes backward in the same direction as your arms.

Which statement about action and reaction forces is correct?

They are equal and act in opposite directions.

They are unequal and act in opposite directions.

They are unequal and act in the same direction.

They are equal and act in the same direction.

A golf ball and a bowling ball are both dropped from a ledge. Which ball will fall faster? Una pelota de golf y una bola de boliche se dejan caer desde una repisa. ¿Qué bola caerá más rápido?

Both balls will fall at the same rate, because acceleration due to gravity is the same for both.

The golf ball will fall faster, because it has less mass and will have greater acceleration.

The bowling ball will fall faster, because it has less mass and will have greater acceleration.

The bowling ball will fall faster, because it has more mass and will have greater acceleration.

A moving train comes to a stop at the station. What happened to make the train change motion?

The train experienced an unbalanced force.

The train does not experience forces acting on it.

The train would stop with or without forces.

The train experienced a balanced force.

John’s team pulls one end of a rope with 8 Newtons of force. Mike’s team pulls the other end of the rope with 4 Newtons of force. What will happen to the rope?

The rope will move towards John.

The rope will move towards Mike.

Mike’s team will fall backwards.

The rope will not move due to balanced forces.

What happens when a force opposite in direction and greater in magnitude is applied to a moving object?

The object will always move backwards.

The object’s motion remains constant.

What happens when balanced forces act on an object at rest?

The object will remain at rest.

The object will push back with a greater force.

What happens to an object if the total of the forces acting on it are greater than zero?

The object’s motion will change.

The object’s motion will remain the same.

Nothing will happen to the object.

Two forces act in opposite directions on a wood block. What will happen if the forces are unbalanced?

The position of the block will change.

The block will balance the forces.

The forces will reverse direction.

The mass of the block will change.

A brick is resting on a level, smooth surface. When a student applies a horizontal force of 5 N to the brick, the force of friction on the brick is also 5 N. Which statement BEST describes the effect of these two forces on the brick?

The net force on the brick is 0 N, and the brick remains at rest.

The net force on the brick is 0 N, and the brick begins to move.

The net force on the brick is 10 N, and the brick begins to move.

The net force on the brick is 10 N, and the brick remains at rest.

Which is an example of balanced forces? ¿Cuál es un ejemplo de fuerzas equilibradas?

a truck beginning to accelerate

Forces and Motion

Authored by Amanda Gunnell

Science

8th Grade

NGSS covered

Used 78+ times

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55 questions

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MULTIPLE CHOICE QUESTION

30 sec • 1 pt

This image shows a crane lifting a concrete block. Which type of force is pulling the concrete block upward?

The normal force pushing against the block.

The gravitational force acting on the block.

The gravitational force acting on the chains.

The tension force transmitted through the chains.

Tags

NGSS.MS-PS2-4

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

A force of 20 N is acting on a box. What other information is needed to accurately describe this force?

Una fuerza de 20 N actúa sobre una caja. ¿Qué otra información se necesita para describir con precisión esta fuerza?

The duration of the force.

The motion of the box.

The direction of the force.

The mass of the box.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

What is a force?

¿Qué es una fuerza?

The speed at which an object moves.

A source of energy in the universe.

A push or pull acting on an object.

The energy of an object.

Tags

NGSS.MS-PS2-1

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

_ is a force that resists motion between surfaces that are in contact.

_ es una fuerza que resiste el movimiento entre superficies que están en contacto.

Resistance

Acceleration

Friction

Inertia

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

An airplane is flying north. What is the direction of the air friction force acting on the plane?

Un avión vuela hacia el norte. ¿Cuál es la dirección de la fuerza de fricción del aire que actúa sobre el avión?

West.

East.

North.

South.

Tags

NGSS.MS-PS2-2

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

Kim is pushing a box on a flat surface. The box is moving. Which type of force is Kim using to move the box?

Kim empuja una caja sobre una superficie plana. La caja se mueve. ¿Qué tipo de fuerza está usando Kim para mover la caja?

Friction force.

Applied force.

Normal force.

Gravitational force.

Tags

NGSS.MS-PS2-2

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

An apple is on a table. The apple’s mass causes it to push on the table. Which force keeps this push in check?

Hay una manzana sobre una mesa. La masa de la manzana hace que empuje la mesa. ¿Qué fuerza mantiene este empujón bajo control?

The gravitational force acting on the table.

The normal force exerted on the apple by the table.

The friction force between the apple and the table.

The applied force acting on the apple.

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Forces and Motion

This image shows a crane lifting a concrete block. Which type of force is pulling the concrete block upward?

A force of 20 N is acting on a box. What other information is needed to accurately describe this force?

Una fuerza de 20 N actúa sobre una caja. ¿Qué otra información se necesita para describir con precisión esta fuerza?

What is a force?

¿Qué es una fuerza?

_ is a force that resists motion between surfaces that are in contact.

_ es una fuerza que resiste el movimiento entre superficies que están en contacto.

An airplane is flying north. What is the direction of the air friction force acting on the plane?

Un avión vuela hacia el norte. ¿Cuál es la dirección de la fuerza de fricción del aire que actúa sobre el avión?

Kim is pushing a box on a flat surface. The box is moving. Which type of force is Kim using to move the box?

Kim empuja una caja sobre una superficie plana. La caja se mueve. ¿Qué tipo de fuerza está usando Kim para mover la caja?

An apple is on a table. The apple’s mass causes it to push on the table. Which force keeps this push in check?

Hay una manzana sobre una mesa. La masa de la manzana hace que empuje la mesa. ¿Qué fuerza mantiene este empujón bajo control?

What happens when balanced forces act on an object at rest?

¿Qué sucede cuando las fuerzas equilibradas actúan sobre un objeto en reposo?

Two students are pushing a sofa across a room.

What is the net force applied to the sofa by the students?

The diagram shows forces acting on a wagon.

A wagon is pulled to the right using a force of 20 N and to the left using a force of 30 N. What is the net force on the wagon?

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Forces and Motion

This image shows a crane lifting a concrete block. Which type of force is pulling the concrete block upward?

A force of 20 N is acting on a box. What other information is needed to accurately describe this force?Una fuerza de 20 N actúa sobre una caja. ¿Qué otra información se necesita para describir con precisión esta fuerza?

What is a force?¿Qué es una fuerza?

_______ is a force that resists motion between surfaces that are in contact._______ es una fuerza que resiste el movimiento entre superficies que están en contacto.

An airplane is flying north. What is the direction of the air friction force acting on the plane?Un avión vuela hacia el norte. ¿Cuál es la dirección de la fuerza de fricción del aire que actúa sobre el avión?

Kim is pushing a box on a flat surface. The box is moving. Which type of force is Kim using to move the box?Kim empuja una caja sobre una superficie plana. La caja se mueve. ¿Qué tipo de fuerza está usando Kim para mover la caja?

An apple is on a table. The apple’s mass causes it to push on the table. Which force keeps this push in check?Hay una manzana sobre una mesa. La masa de la manzana hace que empuje la mesa. ¿Qué fuerza mantiene este empujón bajo control?

What happens when balanced forces act on an object at rest?¿Qué sucede cuando las fuerzas equilibradas actúan sobre un objeto en reposo?

Two students are pushing a sofa across a room.What is the net force applied to the sofa by the students?

The diagram shows forces acting on a wagon.﻿A wagon is pulled to the right using a force of 20 N and to the left using a force of 30 N. What is the net force on the wagon?

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Similar Resources on Wayground

Popular Resources on Wayground

Discover more resources for Science

A force of 20 N is acting on a box. What other information is needed to accurately describe this force?

Una fuerza de 20 N actúa sobre una caja. ¿Qué otra información se necesita para describir con precisión esta fuerza?

What is a force?

¿Qué es una fuerza?

_ is a force that resists motion between surfaces that are in contact.

_ es una fuerza que resiste el movimiento entre superficies que están en contacto.

An airplane is flying north. What is the direction of the air friction force acting on the plane?

Un avión vuela hacia el norte. ¿Cuál es la dirección de la fuerza de fricción del aire que actúa sobre el avión?

Kim is pushing a box on a flat surface. The box is moving. Which type of force is Kim using to move the box?

Kim empuja una caja sobre una superficie plana. La caja se mueve. ¿Qué tipo de fuerza está usando Kim para mover la caja?

An apple is on a table. The apple’s mass causes it to push on the table. Which force keeps this push in check?

Hay una manzana sobre una mesa. La masa de la manzana hace que empuje la mesa. ¿Qué fuerza mantiene este empujón bajo control?

What happens when balanced forces act on an object at rest?

¿Qué sucede cuando las fuerzas equilibradas actúan sobre un objeto en reposo?

Two students are pushing a sofa across a room.

What is the net force applied to the sofa by the students?

The diagram shows forces acting on a wagon.

A wagon is pulled to the right using a force of 20 N and to the left using a force of 30 N. What is the net force on the wagon?