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

The gravitational force of Mars is 38 percent of Earth's gravity. This low gravity is due to the fact that Mars only possesses 11 percent of the Earth's mass and 15 percent of the Earth's volume. The planet's significant... 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 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

An example of elastic force is bungee jumping. The elastic cord creates resistance and imposes a force when the cord is stretched far enough. That elasticity creates the bouncing motion a bungee jumper feels after the in... More » Science Physics Motion & Mechanics