Newton's Laws of Motion

What will happen if you're in a car, and the driver slams on the brake?

• You will stop moving.

• You will continue moving forward.

• You will gradually slow down.

• You will speed up.

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According to Newton's first law, an object in motion will stay in motion unless:

• An opposing force acts on it.

• It's in outer space.

• It stops.

• It remains at rest.

What might happen if you were in a braking car, and you weren't wearing your seat belt?

• You'd fly backward through the rear window.

• You'd be pressed backward into your seat.

• You'd fly forward through the windshield.

• You'd move sideways through the passenger door.

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What causes a ball rolling across a rug to slow to a stop?

• The rug doesn't have enough force to hold the ball.

• Friction resists the ball's forward motion.

• The rug doesn't have enough momentum to keep the ball moving.

• The ball isn't moving fast enough.

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What part(s) of a moving car experience the most friction? Choose the best answer.

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Which of the following is an opinion about friction?

• It occurs any time two objects are in contact

• It always acts in the opposite direction as motion

• It slows objects down too much

• It prevents objects on earth from staying in motion forever

If an unbalanced force acts on an object, what will happen?

• It will not move at all.

• It will accelerate in the same direction as the force.

• It will accelerate in the opposite direction to the force.

• It will accelerate at an angle of 90 degrees to the force.

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Ordinarily, gravity and the normal force counterbalance each other. In other words:

• They reinforce each other

• They have no effect on one another

• They act on you at all times

• They cancel each other out

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What is net force?

• A force associated with the Internet

• The combined forces acting on a particular object

• The same thing as inertia

• The same thing as gravity

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According to Newton's third law, what happens when you push against a wall?

• The wall pushes back at you half as hard as you push against it.

• The wall doesn't resist at all.

• The wall pushes back at you with the same amount of force.

• The wall pushes back at you twice as hard as you push against it.

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