1. A body remains at rest or in motion at a constant speed in a straight line, unless acted upon by a force.
2. When a body is acted upon by a force, the body’s acceleration multiplied by its mass is equal to the force.
3. The mutual interractions between 2 bodies are equal and opposite.
* The wording of the above varies but the 3 laws of motion were formulated by the greatest scientist who ever lived.
Sir Isaac Newton (1642-1727); portrait by Sir Godfrey Kneller.
Back To Number 3 Index