The classic example of gravitational force is that of an apple falling from a tree. Once its stem breaks, the apple accelerates toward the Earth's center of gravity at a rate of 9.8 m/s^2. The effect of gravity is observ... More » Science Physics Motion & Mechanics

A planet's size and mass determines its gravitational force it has on objects and people. Five planets are smaller than Earth and only two are larger. More » Science Astronomy Planets

Earth's gravitational force refers to the force imposed on any object close to Earth as a result of Earth's mass. Any object that is close to the Earth experiences gravity. For example, when a ball or an object is thrown... More » Science Astronomy Planets
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Gravitational pull is the invisible force that causes massive objects to pull other objects towards them. For instance, when a person jumps up in the air, it is the earth’s gravitational pull that causes him to return to... More » Science Physics Motion & Mechanics

As the distance between two objects decreases, the gravitational force between them increases. Conversely, as the distance between them increases, the gravitational force decreases. Gravitational force is inversely propo... More » Science Physics Motion & Mechanics

An example of Newton's second law of motion would be if someone's car ran out of gas and they tried to push it and, because the car is much heavier, it would require more force to push than if it was a lighter object, li... More » Science Physics Motion & Mechanics

An example of mechanical force is the thrust of an airplane. The airplane's engines make use of a propulsion system, which creates a mechanical force or thrust. Without thrust, an aircraft cannot move in the air. More » Science Physics Motion & Mechanics