Force and Motion Review

During a classroom discussion on motion, the teacher instructs the class to write down something that specifically addresses Isaac Newton's second law of motion. Which of these responses would BEST represent the second law?

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

• Every object continues at rest unless acted on by outside forces.

• Acceleration depends on the force applied and the mass of an object.

• Every object attracts every other object and the force is proportional to their masses.

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Which is an example of balanced forces?

• a door starting to open

• a basketball being held

• a truck beginning to accelerate

• a book falling off a table

The action of swimmers using their arms to propel themselves through the water is an example of what law?

• Newton's first law of motion

• Newton's third law of motion

• law of conservation of linear momentum

• law of conservation of angular momentum

Which of these causes matter to resist a change in motion?

• inertia

• friction

• gravity

• weight

During a collision, a seat belt slows the speed of a crash dummy. What is the direction of the net force exerted by the seat belt compared to the direction of the crash dummy's motion?

• in the same direction

• in a vertical direction

• in a downward direction

• in the opposite direction

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NGSS.MS-PS2-1

What causes a free falling object to accelerate?

• inertia

• gravity

• initial speed

• initial direction

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Angela blows air into a balloon and holds the end of it closed with her fingers. When she lets go of the end of the balloon, Angela observes that the release of the air propels the balloon. The propelling of the balloon from the release of the air is an example of which of Newton's laws?

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

• A force of attraction exists between any two objects with mass.

• The force of an object is the product of its mass multiplied by its acceleration.

• An object in motion tends to stay in motion unless an unbalanced force acts upon it.

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NGSS.MS-PS2-1

Isaac Newton discovered the three laws of motion. Which example BEST illustrates Newton's third law of motion, which describes action and reaction forces?

• a rocket takes off from the ground

• a book slides forward on a seat when the car stops

• a heavier ball falls at the same speed as a lighter ball

• a vehicle rounds a curve and changes its acceleration

Tags

NGSS.MS-PS2-1

A ball rolls across the floor and slows down to a stop. Which force caused the ball to slow down?

• Friction

• gravity

• magnetic

• inertia

Tags

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If the ball in the picture below moves east, which unbalanced force must be acting on it?

• up

• down

• right

• left

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