We will also address phenomena pertaining to heat and temperature.

The displacement, velocity and acceleration of a body provide information about its motion. We will now consider the cause of the motion.

A body will begin to move when it is either pushed or pulled, that is, when it is under to the influence of a force. Although there are many types of forces in nature, their influence can be accurately described by referring to three general laws of motion. These laws were first formulated by the scientist Sir Isaac Newton (1642-1772). Newton developed the laws of motion and formulated the mathema

If we push a chair horizontally, with a force of 10 newtons, the chair will exert a force of 10 newtons on us, in the opposite direction. It is important to note that, each force is directed at a different body. That is why they do not cancel each other out.

For the sake of emphasis, let us reiterate: there is a correlation between body weight and mass, but the terms are different: weight is a vector that indicates the force of gravity exerted on a body; whereas, mass is a scalar measure. Let’s return to the definition of weight:

Newton noticed, that each time force is exerted on a body, the body exerts equal force, but in the opposite direction. This relationship is called action and re-action.

The body’s mass on earth is identical to its mass on the moon, on Jupiter, or anywhere else. Mass is measured in units of kilograms (not kg. of force) and is a scalar.

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