Big Idea 13: Forces and Changes in Motion

A softball player hits a softball with her bat. Which forces are acting on the ball?

• Push

• gravity

• pull

• friction

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In which order are the forces acting on the ball?

• gravity, push, pull

• pull, push, friction

• push, friction, gravity

• push, gravity, friction

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NGSS.MS-PS2-1

What could Mia do to push a TV as far as a pencil?

• Increase the force applied to the TV

• Increase the force applied to the pencil

• Push the TV with the same force as a pencil

• Push the TV again with the same amount of force to see if anything changes

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NGSS.MS-PS2-2

What type of force is this?

• Balanced

• Unbalanced

Answer explanation

Both of the men are pushing with the same amount of force and in opposite directions, so the box will not move.

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Which Elephant has greater force?

• The elephant on the left.

• The elephant on the right

• None because the forces are balanced and both 200 Newtons

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Which side will win the Tug-o-war and why?

• The left side because they are bigger

• The right side because there is one more person compared to the left side

• None because the forces are balanced

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NGSS.MS-PS2-2

If you slide a book down the hallway, what makes the book stop moving?

• Gravity

• Friction

• Pushing

• Pullin

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Which surface would have the most friction if you rolled a ball on it?

• A rocky road

• A smooth hallway

• A street

• A dirt road

Answer explanation

A rocky road will be bumpy and cause the book to have more friction.

In which direction does gravity push?

• Up

• down

• to the left

• to the right

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NGSS.5-PS2-1

In which direction does air resistance work?

• In the direction opposite as gravity (against gravity)

• In the same direction as gravity