Force, Gravity, Friction, Work

Why is it harder for the boy in Image B to get down the hill?

• Motion

• Friction

• Work

• Displacement

How is gravity affected by mass?

• the larger the mass of the object, the greater the gravity

• small objects have no gravity

• gravity is not affected by mass of objects, whether large or small

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NGSS.MS-PS2-4

An example of the force of gravity is-

• a rocket flying through space

• a ball falling to the ground after it has been thrown

• a cloud moving across the sky

• the Sun rising

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A force that slows or stops motion when objects rub together.

• Friction

• Push

• Pull

• Magnetism

If bricks are loaded into an empty wheelbarrow, which of these is true?

• less force is needed to move the wheelbarrow

• the amount of friction increases

• more force is needed to move the wheelbarrow

• the wheelbarrow's speed increases

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NGSS.MS-PS2-2

John stands at the top of a steep hill and pushes a ball over the edge with his foot. Which force causes the ball to continue rolling down the hill?

• mass

• gravity

• friction

• air resistance

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NGSS.MS-PS2-4

Which statement best explains why the car rolled down the wood ramp the fastest?

• There was more force applied to the car on the wood ramp.

• There was less friction on the surface of the wood ramp.

• The wood ramp was higher than the other ramps.

• The car on the wood ramp had more mass.

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Lilly has a flat piece of paper and a ball of paper. She drops both papers at the same time from the same height. The ball of paper hits the ground first. Which force acts on the flat piece of paper that slows it down?

• friction

• gravity

• inertia

• magnetism

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NGSS.MS-PS2-2

Two people need to move a large, heavy box. One person pushes the box, while the other person pulls the box. Which way of moving the box makes the work easiest for the people?

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A man is pushing a ball up a hill. If the man stops pushing the ball and steps out of the way, what will most likely happen to the ball?

• It will stop on the hill.

• It will roll down the hill.

• It will roll to the side toward the man.

• It will fly.

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NGSS.MS-PS2-2

NGSS.MS-PS2-4

NGSS.MS-PS3-5