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

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
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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 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

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

A moment arm is the distance between the joint axis and the line of force acting on the joint; an example is using a wrench to loosen a nut, the wrench acts as a moment arm and produces more force than trying to free the... More » Science Physics Motion & Mechanics