7 P 1 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

• A

• B

• C

• D

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NGSS.MS-PS2-1

NGSS.MS-PS2-2

When one force in a pair is greater than the other, we call this:

• balanced force

• unbalanced force

• magnitude

• friction

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NGSS.3-PS2-1

Two balls are rolled down two identical inclined planes. The balls are exactly the same mass and size, but one ball rolled down the inclined plane faster. Identify a possible reason that one ball rolled faster than the other ball.

• One ball was red and the other ball was blue.

• One ball was new and the other ball was old.

• One ball was shiny and the other ball was dull.

• One ball was sticky and the other ball was smooth.

List the steps of the scientific method

d

e

f

c

b

a

Conduct experiment

Form a hypothesis

Communicate results

Draw conclusions

Ask a question

Analyze results

When Anna tells her father that her bicycle is hard to pedal, he oils the chain. How does this make her bike easier to ride?

• Friction on the bike has increased.

• Friction on the bike has decreased.

• Gravity on the bike has increased.

• Gravity on the bike has decreased.

A person is pushing a lawnmower. Which best describes what is occurring?

•  Inertia is being applied to the lawnmower

• Force is being applied to the lawnmower.

• There is no friction acting on the lawnmower

• There is no gravity acting on the lawnmower.

Tags

NGSS.MS-PS2-2

Jim played ice hockey with his friends. When he hit the puck, it stopped before reaching the goal. Which most likely caused this to happen?

• mass

• gravity

• friction

• momentum

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NGSS.MS-PS2-2

Some students are playing tug of war. On the right side of the rope are four students with a total mass of 400 pounds on the left side of the rope are 2 students with a total mass of 140 pounds. Which statement is correct?

• The forces pulling on the rope are balanced.

• The right side of the rope will have more force pulling on it.

• The left side of the rope will have more force pulling on it.

• There are no unbalanced forces acting on the rope.

Tags

NGSS.MS-PS2-2

What kind of force do brakes use to stop a moving bicycle?

• gravity

• electric

• magnetic

• friction