8th grade Newton's Law Assessment

Imagine a soccer ball lying in the middle of a field. What does Newton's first law state about the motion of this soccer ball?

• Acceleration means a change in speed or direction of the soccer ball.

• The soccer ball in motion tends to stay in motion while the soccer ball at rest tends to stay at rest unless acted on by some force.

• Force equals mass times acceleration of the soccer ball.

• For every action, there is an equal and opposite reaction involving the soccer ball.

Imagine a soccer ball rolling on the field. What explains its tendency to keep moving until a player stops it?

• A tendency to remain unchanged (keep moving or keep still)

• The resistance that one surface or an object encounters when moving against another

• The amount of stuff that makes up something

• A change in speed or direction of something

What is friction?

• A tendency to do nothing or to remain unchanged
• The amount of stuff that makes up something
• A change in speed or direction of something
• The resistance that one surface or an object encounters when moving against another

A soccer ball is kicked and accelerates at a rate determined by the force applied and its mass. Which of Newton's laws does this scenario illustrate?

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

• Force equals mass times acceleration

• An object in motion tends to stay in motion while an object at rest tends to stay at rest unless acted on by some force

• Acceleration means a change in speed or direction of something

Tags

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Imagine you have a decorative magnet that you want to attach to your refrigerator door. Which type of force allows the magnet to stick to the refrigerator without direct contact?

• Magnetism

• Friction

• Air resistance

Tags

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What is the mass of an apple?

• The resistance that the apple surface encounters when moving against another surface

• The amount of stuff that makes up the apple

• A change in speed or direction of the apple

• A tendency of the apple to do nothing or to remain unchanged

What is the acceleration of a car when it speeds up from a traffic light?

• The amount of stuff that makes up the car

• The resistance that the car's tires encounter when moving against the road

• A change in speed or direction of the car

• A tendency of the car to do nothing or to remain unchanged

Tags

NGSS.MS-PS2-2

If you push a skateboard, it pushes back with equal force. Which of Newton's laws does this illustrate?

• An object in motion tends to stay in motion while an object at rest tends to stay at rest unless acted on by some force

• Acceleration means a change in speed or direction of something

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

• Force equals mass times acceleration

Tags

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What is an example of Newton's first law?

• Trying to push a couch that's sitting on a fluffy rug is harder than pushing that same couch on a smooth floor
• Jumping on a diving board
• A pair of snow skis aren't going to go anywhere without a skier in them forcing them to move
• A ball rolling along a level surface will eventually slow down and stop due to friction

What is an example of inertia?

• Jumping on a diving board

• Trying to push a couch that's sitting on a fluffy rug is harder than pushing that same couch on a smooth floor

• A book on a table remaining at rest

• A ball rolling along a level surface will eventually slow down and stop due to friction