Quiz about Forces and Motion

Question 1

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

Accepted Answer

The tension force transmitted through the chains.

Answer

The normal force pushing against the block.

Answer

The gravitational force acting on the block.

Answer

The gravitational force acting on the chains.

Question 2

Two students are pushing a sofa across a room.

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

Accepted Answer

400 N

Answer

250 N

Answer

200 N

Answer

150 N

Question 3

The box is being pushed to the right with a force of 300 newtons, and to the left with a force of 400 newtons.

Which is the net force on the box?

Accepted Answer

100 newtons

Answer

400 newtons

Answer

700 newtons

Answer

300 newtons

Question 4

Four forces are acting on a box, as shown below.

These forces will move the box...

Accepted Answer

downward and to the left.

Answer

upward and to the right.

Answer

upward and to the left.

Answer

downward and to the right.

Question 5

One person pulls on a rope with a force of 400 N to the right. Another person pulls on the opposite end of the rope with a force of 600 N to the left. What is the net force on the rope?

Accepted Answer

200 N to the left.

Answer

400 N to the right.

Answer

1000 N to the left.

Answer

600 N to the left.

Question 6

A ball on a cart is moving at a rate of 2 m/s. The cart suddenly stops, but the ball continues to travel in the same direction at the same speed. This is an example of the...

Accepted Answer

first law of motion.

Answer

second law of motion.

Answer

third law of motion.

Answer

law of gravity.

Question 7

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?

Accepted Answer

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

Answer

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

Answer

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

Answer

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

Question 8

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?

Accepted Answer

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

Answer

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

Answer

Measurement error causes multiple observations of motion to conflict.

Answer

Velocity varies with the compass direction of motion.

Question 9

You are sitting in a moving bus and tossing a ball straight up and down. What does the motion of the ball look like in the frame of reference of a person standing on the sidewalk as the bus goes by?

Accepted Answer

Option C is correct

Answer

A.

Answer

B.

Answer

D.

Question 10

You are sitting in a moving bus and tossing a ball straight up and down. What does the motion of the ball look like in your frame of reference?

Accepted Answer

Option D is correct

Answer

A.

Answer

B.

Answer

C.

Question 11

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?

Accepted Answer

Acceleration decreases velocity until the car stops.

Answer

Acceleration no longer exists as the car stops.

Answer

Acceleration remains constant while friction causes the car to stop.

Answer

Acceleration increases velocity until the car stops.

Question 12

Which of the following represents the velocity of a moving object?

Accepted Answer

40 m/s north.

Answer

40

Answer

40 m/s.

Answer

40 m north.

Question 13

A car moves with a velocity of 15 m/s west for 3 seconds. Then, the car moves with a velocity of 15 m/s east for 1 second. What is the total displacement of the car?

Accepted Answer

30 m west.

Answer

30 m east.

Answer

60 m east.

Answer

60 m west.

Question 14

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?

Accepted Answer

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

Answer

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

Answer

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

Answer

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

Question 15

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

Accepted Answer

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

Answer

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

Answer

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

Answer

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

Question 16

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

Accepted Answer

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

Answer

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

Answer

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

Answer

It pushes backward in the same direction as your arms.

Question 17

A force of 20 N is applied from left to right on a block with a mass of 5.0 kilograms. What is the acceleration of the block?

Accepted Answer

4 m/s2 to the right.

Answer

25 m/s2 to the right.

Answer

20 m/s2 to the right.

Answer

100 m/s2 to the right.

Question 18

A force of 200 N toward north is exerted on an object with a mass of 40.0 kilograms. What is the acceleration?

Accepted Answer

5 m/s2 toward north.

Answer

5 m/s.

Answer

5 m.

Answer

5 N toward north.

Question 19

Which statement about action and reaction forces is correct?

Accepted Answer

They are equal and act in opposite directions.

Answer

They are unequal and act in opposite directions.

Answer

They are unequal and act in the same direction.

Answer

They are equal and act in the same direction.

Question 20

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

Accepted Answer

The train experienced an unbalanced force.

Answer

The train does not experience forces acting on it.

Answer

The train would stop with or without forces.

Answer

The train experienced a balanced force.

Question 21

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

Accepted Answer

The object will remain at rest.

Answer

The object will accelerate.

Answer

The object will move forward.

Answer

The object will push back with a greater force.

Question 22

The arrows in the diagram below represent equal forces acting on balls that are resting on a table.

Which of the balls will be accelerated if the forces are applied?

Accepted Answer

Ball 2

Answer

Ball 1

Answer

Ball 3

Answer

Ball 4

Question 23

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

Accepted Answer

The position of the block will change.

Answer

The block will balance the forces.

Answer

The forces will reverse direction.

Answer

The mass of the block will change.

Question 24

Forces that cancel each other are called

Las fuerzas que se anulan se llaman

Accepted Answer

balanced

Answer

inactivated

Answer

unbalanced

Answer

neutral

Question 25

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?

Accepted Answer

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

Answer

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

Answer

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

Answer

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

Question 26

When unbalanced forces act on an object in the same direction the object will likely do all of the following except:

Accepted Answer

not change movement

Answer

stop moving

Answer

change direction

Answer

start moving

Question 27

When balanced forces act on an object, the objective will likely

Accepted Answer

Not move

Answer

move

Answer

speed up

Forces and Motion

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