Solar System

Which psychiatrist first studied gravity?

• Niels Bohr

• Isaac Newton

• Albert Einstein

• Michael Faraday

Why does an object weigh less on the moon than on Earth?

• because the moon's gravity is lower

• because the object changes shape

• because the moon is larger than Earth

• because the object loses mass in space

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What is an example of a pull?

• turning a knob

• throwing a ball

• dragging a blanket

• moving a bike pedal

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What is an example of friction?

• a baseball hit by a bat

• a toy car rolling to a stop

• a dog tugging on its leash

• a rocket launched into space

What does a push do?

• causes objects to fall down

• causes objects to always stop

• moves objects toward each other

• moves objects away from each other

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Which is an example of push?

• tying a knot

• kicking a ball

• dragging a box

• sharpening a pencil

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What force creates weight?

• friction

• gravity

• mass

• push

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What is required to launch a rocket into space?

• enough force to oppose gravity

• windows to steer the rocket safely

• a frictionless coating on the rocket

• a rocket that weighs less than gravity

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How can astronauts float in space?

• Space reduces the mass of objects.

• The Earth's gravity is weak that far away.

• Spacesuits have anti-gravity technology.

• The gravity of Earth and the sun is balanced.

What keeps the planets in their orbits?

• electricity

• friction

• gravity

• tension

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