Gravity is the force that exerts a force on every other object in the universe. An example of this cold be the gravitational force of attraction between your hand and your pencil. When you let go of the pencil it doesn't stay in your hand because the gravitational force of Earth is much stronger that the gravitational force of your hand. On Earth gravity exerts a downward force on your body.
Depending on the mass of objects and how far away they are from one another will determine the amount of gravitational force there is. That is why a pencil will drop to the Earth when you let it go. The Earth is larger than your hand so the pencil is drawn to the Earth instead of your hand.
The closer an orbiting object is to Earth the greater gravitational force it will have. The farther away it is, the less effect gravity has on it. The amount of gravitational force between two objects depends on their mass and distance.
The measure of the force of gravity on an object is the object's weight. When you hear or read the term weight it is used in reference to the gravitational force between Earth and a bod at Earth's surface. It is not the same as mass. Weight is a force and is measured in Newtons.
A person who weighs 480 Newtons on Earth would only weigh about 80 Newtons on the moon because the Earth has more mass than the moon so it has more of a gravitational force. That same person would have the same mass whether they were on the moon or on Earth.
Scales use the principle of balanced forces to measure how uch something weighs.
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