Force and Motion Study

If I caused two cars, a heavy one and a light-weight one, to move with the same push, what

would be the effect?

• The heavy car would travel further than a light weight car.

• The heavy car would travel a shorter distance than the light weight car.

• They would both travel the same distance.

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On which track would a car move the fastest?

• flat track

• gently sloping track

• steeply sloping track

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What is the best description of what forces do?

• They only stop things moving.

• They only start things moving.

• They make things speed up, slow down, or change directions.

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Predict what would happen to the speed of a cart moving across the floor when mass is added to

it?

• The cart would speed up.

• The cart would slow down.

• The cart would not change its speed at all.

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Predict what would happen to the speed of a toy car when it moved from a smooth surface to a

rough surface?

• The toy car would speed up.

• The toy car would slow down.

• The toy car wouldn’t change its speed at all going from one surface to the other.

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A car is traveling at a speed of 100 kilometers per hour. Suddenly, it starts going faster. Predict

what caused this increase in speed?

• Velocity made it go faster.

• Inertia made it go faster.

• Speed made it go faster.

• An outside force made it go faster

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Tim is pushing a box across the floor. Mary decides to help him. What is the result?

• The mass of the box decreases.

• The box has less inertia.

• Friction is reduced by half.

• The box moves faster.

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NGSS.MS-PS2-2

An object is moving at constant speed. The object changes direction and continues moving at the same speed. What caused the object to change direction?

• momentum

• inertia and gravity

• a change in speed

• an outside force acted upon it

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NGSS.MS-PS2-5

A pitcher throws a baseball toward a batter. The batter hits the ball and sends it flying toward first base. What caused the ball to change direction?

• the acceleration of the pitcher

• the mass of the ball

• the force of the batter

• the inertia of the pitcher

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A car is moving at a speed of 60 kilometers per hour. Its speed then increases to 70 kilometers per hour. What must be true of the car?

• Its direction of travel changed.

• Its mass increased.

• It accelerated.

• Its velocity decreased.

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