Science Midterm Review

A ball rolling along a smooth sidewalk suddenly rolls onto a grassy area. What will happen to the ball’s motion?

• It will roll slower because friction decreases

• It will roll slower because friction increases

• It will roll faster because friction decreases

• It will roll faster because friction increases

The force that keeps satellites in orbit around Earth

• magnetic

• friction

• gravity

• electrical

Tags

NGSS.MS-ESS1-2

NGSS.MS-PS2-4

Why does a basketball thrown high in the air come back to the ground after a few seconds?

• Air pressure inside the ball forces it downwards.

• Sun's gravity pushes the ball downwards

• Earth's gravity pulls the ball downwards

• Air pressure pushes the ball downwards

Tags

NGSS.MS-PS2-2

NGSS.MS-PS2-4

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An object is said to be in free fall if:

• the only force acting on it is gravity

• there are no forces acting on it

• the only force acting on it is friction

• the object is traveling in a straight line.

Tags

NGSS.MS-PS2-4

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If an object is moving at a constant velocity, it means that ________.

• no net force is acting on it

• a constant force is acting on it in the direction of its motion

• a constant force is acting on it in the opposite direction of its motion

• several forces are acting on it, but one force is greater than the others

What effect does friction have on a moving object?

• It causes a moving object to speed up

• It causes the moving object to slow down and eventually stop

• It keeps the moving object moving in the same direction forever

• It causes the moving object to turn around and move in the opposite direction

Tags

NGSS.MS-PS2-2

The speed and direction of an object is its

• inertia

• velocity

• momentum

• acceleration

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If you were to go to the moon, you would weigh less than you do on Earth. Why?

• You lose mass when you travel through space.

• The Moon has more mass than Earth

• The Moon has less mass than Earth.

• The Moon has no gravity

Tags

NGSS.MS-PS2-4

1.

When a feather and a hammer are dropped at the same time, why does the hammer hit the ground first?

• Heavier objects always fall faster than lighter objects

• The feather has no mass

• Air resistance slows the fall of the feather

• Gravity only affects heavy objects

Jules is conducting an experiment involving friction. He is measuring the temperature of various objects and surfaces after quickly rubbing them together. He is testing a steel ball bearing and a tennis ball on carpet, linoleum flooring, and a glass surface by rubbing the object 20 times in 6 seconds over the surface. Check all scenarios that show a correct prediction.

• The temperature of the surface of the ball bearing when rubbed over the glass will be least

• The temperature of the tennis ball and the ball bearing over the glass surface will be the same

• The temperature of the tennis ball rubbed on the carpet will be the highest

• The temperature of the surface of the tennis ball will not change on the glass

Tags

NGSS.MS-PS1-4

NGSS.MS-PS3-3

NGSS.MS-PS3-4