Unit 5 Motion Review

According to Newton's third law of motion, when an astronaut pushes against another astronaut and exerts a force on them, the other astronaut --

• doesn't do anything

• moves at a constant speed

• moves at right angles to the first astronaut

• exerts and equal force back on the first astronaut

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Why are scissors considered a compound machine?

• They are made of two or more simple machines.

• They make work easier.

• They have few to no moving parts

• They can be used for many different tasks.

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Fill in the blank: Comparing output work to input work gives us _________________________ expressed as a percentage.

• force

• efficiency

• work

• power

Force is calculated by multiplying which two factors together?

• mass and speed

• mass and acceleration

• speed and acceleration

• work and power

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The pull of gravity on a object is called its --

• mass

• density

• volume

• weight

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Which of these uses the force of gravity to make it move?

• snow sliding down your jacket from a thrown snowball

• throwing the snowball

• wind blowing snow off the tree

• making a snowman

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If Sally buys a lower-mass car such as a Prius, what will happen to the car's ability to accelerate?

• It will increase.

• It will decrease.

• It will stay the same.

• There is no relationship between mass and acceleration.

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NGSS.MS-PS2-2

Identify one of the simple machines that make up a pizza cutter.

• wheel and axle

• wedge

• lever

• inclined plane

Which of these is an example of work being done on an object?

• pushing your chair in

• holding the door open for others

• sitting on the dock fishing

• holding up a banner while someone attaches it to the wall

Why does Mercury feel the greatest gravitational pull from the Sun?

• it is very small

• it is closest to the Sun

• it is very hot during the day and very cold at night

• it has no atmosphere so isn't protected

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