Gravitational Forces Between Objects

Some examples of gravity are things falling down to the ground or the force that hold us to Earth.

A force is something that makes another object move (i.e., a push or a pull), like when you push a door open.

Magnets can make some things, such as metal, move without touching them.

Yes, they would hit the ground at the same time because they are the same object.

The Sun’s gravitational force keeps Earth in orbit. Earths gravitational force keeps the Moon in orbit.

Astronauts need to know about gravity because they go out into space where there is no gravity. Construction workers need to know about gravity because they work way up on tall buildings and don’t want to fall. The people who wash the windows on the outside of buildings also need to know about gravity.

Gravity is the force that pull objects to the center of Earth.

The Moon affects the tides on Earth. High tide is caused by the Moon’s gravity.

Gravity is not the same in all places. For example, if you were high up on a mountain, you would weigh less because the force of gravity is less.

Although the Sun is very far way, its size keeps Earth in its orbit because of the gravitational force between the two masses.

Resistance is a force that acts in the opposite direction. If two of the same kind of umbrellas were dropped from the same height at the same time, they would hit the ground together. But if one umbrella were open, it would have more resistance and hit the ground after the one that was closed.

Mass is the amount of matter that makes up an object (number of molecules an object has). Weight is measured on a scale and can change based on the force of gravity.