Using F=ma, explain why a train is more difficult to start moving and more difficult to bring to a stop than an average sized car.

Because a train has much more mass than a car, requiring more force to change its motion.

Because a train has less friction than a car, making it harder to move or stop.

Because a train moves faster than a car, so it is harder to control.

Because a train uses a different type of engine than a car, making it harder to start or stop.

During a tug-of-war competition, neither team is able to gain an advantage. Which of the following explains the forces in this situation?

The forces are overcome by air friction.

The mass of the rope cancels the forces being exerted on it.

Two vehicles with different masses are traveling 104 kilometers per hour on a highway. As each vehicle approached a traffic light, it turned red. Each car applied their brakes at the same time and applied the same amount of force to stop.

The vehicle with the larger mass took longer to stop than the vehicle with the smaller mass.

The vehicle with the smaller mass took longer to stop than the vehicle with the larger mass.

The vehicle with the smaller mass has more inertia than the vehicle with the larger mass.

The vehicle with the larger mass took less force to stop than the vehicle with the smaller mass.

A student bounces a basketball off the gym floor. Which statement correctly describes the action-reaction force pair that causes the ball to bounce?

The gym floor pushes up on the ball as the ball pushes down on the floor with an equal amount of force.

The gym floor pushes up on the ball with a greater amount of force than the ball pushes down on the floor.

The gym floor pushes up on the ball as gravity pulls down on the ball with an equal amount of force.

The gym floor pushes up on the ball with a greater amount of force than gravity pulls down on the ball.

When a cannon fires a cannonball we observe Newton's third law. Which is the reaction force?

The cannonball moving backwards

Which law is this demonstrating?

3rd law because they move in opposite directions with the same force.

1st law because the cannon moves slower due to having more mass.

2nd law because the cannon doesn't move until an unbalanced force is applied.

4th law because cannons go boom.

Consider the scenario of a skydiver falling down toward earth. Which of the following is true?

The earth is pulling down on the skydiver with a gravitational force, and the skydiver is pulling up on the earth with an equal gravitational force.

The earth is pulling down on the skydiver with a gravitational force, but the skydiver does not exert a gravitational force on the earth.

The earth is pulling down on the skydiver with a large gravitational force, and the skydiver is pulling up on the earth with a small gravitational force.

Neither the earth nor the skydiver can exert a force on each other because they're too far away.

A baseball bat hits a baseball with a force of 100 Newtons. What is the force and its direction exerted by the ball on the bat?

100 Newtons, opposite direction

200 Newtons, opposite direction

Newton's Third Law of Motion is best defined by which statement?

For every action there is an equal and opposite reaction.

A body at rest tends to remain at rest.

A body in motion tends to remain in motion unless acted on by another force.

Inertia, it is all about inertia and speed and motion.

7H UNIT 3

8th Grade

•

29 Qs

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7H UNIT 3

Quiz

•

Science

•

8th Grade

•

Practice Problem

•

Medium

•

NGSS

MS-PS2-1, MS-PS2-2, MS-PS2-4

Standards-aligned

Araz U

Used 9+ times

FREE Resource

29 questions

Show all answers

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

One of the laws of motion states, "An object in motion stays in motion unless an unbalanced force acts upon it." On Earth, objects always seem to eventually come to a stop when more force is not being applied. What force is causing the objects to eventually stop moving?

Mass

Friction

Weight

Gravity

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

What is the net force and direction for the first diagram?

0N, no direction (forces are balanced)

5N, to the right

10N, to the left

15N, to the right

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

What is the net force and direction for the second diagram?

17N left (35N - 18N = 17N left; up and down forces are balanced)

17N right (35N - 18N = 17N right; up and down forces are balanced)

53N left (35N + 18N = 53N left; up and down forces are balanced)

0N (All forces are balanced)

Tags

NGSS.MS-PS2-1

NGSS.MS-PS2-2

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

What is the net force and direction for the third diagram?

15N down (45N - 30N = 15N down)

75N up (45N + 30N = 75N up)

15N up (45N - 30N = 15N up)

30N down (45N - 15N = 30N down)

Tags

NGSS.MS-PS2-1

NGSS.MS-PS2-2

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

What is the net force and direction of the force for ? Choose the correct answer from each drop-down to complete the statement.

Upward

Downward

Leftward

Rightward

Tags

NGSS.MS-PS2-2

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

Describe the forces below as an action or reaction force.

Action Force

Reaction Force

Tags

NGSS.MS-PS2-1

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

Describe the forces below as an action or reaction force.

Action Force

Reaction Force

Tags

NGSS.MS-PS2-1

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7H UNIT 3

29 questions

One of the laws of motion states, "An object in motion stays in motion unless an unbalanced force acts upon it." On Earth, objects always seem to eventually come to a stop when more force is not being applied. What force is causing the objects to eventually stop moving?

What is the net force and direction for the first diagram?

What is the net force and direction for the second diagram?

What is the net force and direction for the third diagram?

What is the net force and direction of the force for ? Choose the correct answer from each drop-down to complete the statement.

Describe the forces below as an action or reaction force.

Describe the forces below as an action or reaction force.

A runner's foot pushes backward on the ground.

Describe the forces below as an action or reaction force.

Based on the observations and the calculations made by the students, what is the estimated force applied to the skateboarder if the acceleration is 0.9 m/s²?

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