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Unformatted text preview: Experiment 4
Newton’s Laws
Objective
To demonstrate and conﬁrm Newton’s 3 laws of motion and to test the equivalence principle
relating inertial mass to gravitational mass. Theory
The ﬁeld of Classical Mechanics is based on Newton’s 3 laws of motion, that can be summarized as follows:
1. An object at rest will remain at rest unless acted on by a net force, and an object in
motion will continue in motion with constant velocity unless acted on by a net force.
2. The net force on an object is equal to the time rate of change of its momentum. (i.e.
F = ma for an object with constant mass).
3. For every action (Force) there is an equal and opposite reaction.
Newton’s ﬁrst law is really just a speciﬁc case of his second law. Newton’s second law states
that the net force on an object equals its mass times its acceleration. With this relationship
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 Fall '08
 Staff
 Physics, Inertia, Mass

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