Gravity can also cause an object that is thrown into the air to change its upward motion, slow down, and fall back toward Earth's surface. The pull of Earth's gravity keeps the Moon in orbit; the moon is constantly changing direction because of gravity.

• The force that causes a rock to roll downhill.

• The force that causes a lock of your hair to fall to the floor after it has been cut off.

• The force that causes a jump rope to come back to the ground after you swing it over your head.

• The force that causes a balloon that is out of helium to come back down to the ground.

• The force that causes a piece of paper that is blowing in the wind to eventually come back down to Earth.

• The force that keeps you walking on Earth instead of floating away into space.

• The force that causes a pen that rolls off of your desk to fall onto the floor.

• The force that causes an apple to fall downward from an apple tree.

• The force that causes your drink to rest at the bottom of your glass instead of hovering near the top of your glass.

• The force from the moon that causes the tides of the ocean.

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