Force and Motion

Newton's third law states that "for every action there is an ______________ and ____________ reaction."

• change in speed, opposite reaction

• change in mass and an acceleration

• acceleration, force

• equal and opposite

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NGSS.MS-PS2-1

What does the law of inertia state?

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

• The force of an object is equal to its mass multiplied by its acceleration

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

• An object at rest will remain at rest unless acted on by an unbalanced force and an object in motion will remain in motion with constant velocity unless acted upon by an unbalanced force.

A rocket blasts off. What law of motion is this an example of?

• The Law of Inertia

• The Law of Acceleration

• The Law of Action-Reaction

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NGSS.MS-PS2-1

Groceries in a car fly forward when the brakes are suddenly pressed. This is an example of

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

• The force of an object is equal to its force times its acceleration.

• An object in motion will remain in motion unless acted on by an unbalanced force and an object in motion will remain in motion with constant velocity unless acted upon by an unbalanced force.

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NGSS.MS-PS2-2

What is the force that opposes the motion of objects through air?

• Gravity

• Friction

• Air resistance

• Tension

• Gravity caused the car to speed up when rolling down the ramp and slow down when rolling across the floor.

• Friction caused the card to speed up when rolling down the ramp and slow down when rolling across the floor.

• Gravity caused the car to speed up when rolling down the ramp, and friction caused the car to slow down when rolling across the floor.

• Friction caused the car to speed up when rolling down the ramp, and gravity caused the car to slow down when rolling across the floor.

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NGSS.MS-PS2-2

NGSS.MS-PS2-4

What happens to the motion of an object when an unbalanced force acts on it?

• It continues moving at the same speed.

• It changes direction.

• It stops immediately.

• It changes speed or direction.

Tags

NGSS.MS-PS2-2

What does Newton's first law of motion state?

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

• Force equals mass times acceleration.

• An object at rest stays at rest, and an object in motion stays in motion unless acted upon by an unbalanced force.

• The acceleration of an object depends on the mass of the object and the amount of force applied.

What happens to the speed of an object if the net force acting on it is zero?

• It speeds up

• It slows down

• It remains constant

• It changes direction

What is Newton's first law of motion also known as?

• The law of inertia

• The law of acceleration

• The law of action-reaction

• The law of gravity