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1. 
What is gravity?
A.
It is a force that separates objects.
B.
It is a force that pulls objects together.
C.
It is the force that created the Moon.
2. 
Who discovered the concept of gravity?
A.
Isaac Newton
B.
the austronauts
C.
NASA
3. 
What makes objects fall to the ground?
A.
the force with which they are thrown
B.
the distance that they fall
C.
the force of gravity pulling things to the center of the Earth
4. 
What makes some objects fall slower than others?
A.
gravity
B.
weight
C.
air resistance
5. 
Which object would hit the ground faster if dropped at the same time from the same height: a bowling ball or a tennis ball?
A.
the bowling ball
B.
the tennis ball
C.
They would hit the ground at the same time.
6. 
Which item would create more air resistance when falling: a leaf or an acorn?
A.
the leaf
B.
the acorn
C.
They would create the same amount of air resistance.
7. 
Which celestial body does gravity pull toward the Earth?
A.
the Sun
B.
the Moon
C.
human-made satellites
8. 
Why do astronauts float when they are in space?
A.
because the space crafts have no gravity
B.
because they are falling toward the Earth at the same speed they are moving around it
C.
because they weigh less in space