Force
A force can most easily be described as a push or a pull. When a force is applied to an object, the velocity of that object changes. This change in velocity constitutes an acceleration. So, forces are tied to accelerations.
Galileo and Newton were scientists who developed our understanding of forces.
When we say that there is a force on an object we mean that there is a push or a pull on the object. Some outside agent is placing this push or pull on the object.
In the metric system forces are measured in units of Newtons. This unit is named after Isaac Newton. In the English system forces are measured in units of pounds. A Newton of force is much smaller than a pound of force. It takes about 4.5 Newtons to equal a force of one pound. So, if you usually state your weight in pounds, then you could figure your weight in the Newtons by multiplying those pounds by 4.5.
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