What is gravity force?

Gravity force (also called weight) is the attractive force that gravity exerts on an object with mass. It's calculated using F = mg, where m is the object's mass and g is gravitational acceleration. On Earth's surface, gravity force euals an object's weight in Newtons. For example, a 10 kg bowling ball experiences a gravity force of 98 N downward. This force is what you feel when you hold something you're resisting its weight. Gravity force varies depending on location: the same object weighs less on the Moon or at high altitudes, and more on Jupiter, even though its mass remains constant.