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Force and Newton's three Laws We have all known from a young age that an acceleration is caused by a push or a pull. Today we will express this more qualitatively in 3 laws which are called Newton's Laws. Newton's first Law. Newton's first law really harks back to the early 17th century. It was Galileo who expressed what he called the law of inertia, he stated: "A body at rest remains at rest and a body in motion continues to move at constant velocity along a straight line unless acted upon by an external force." Now you can read Newton's own words from his famous book Principia: "Everybody perseveres in its state of rest or of uniform motion in a right line unless it is compelled to change that state by forces impressed upon it." The problem is that Newton's 1st law goes clearly against our daily experiences; things that move don't...

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