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# sum_lecture02 - T he Physics of L ight Sound Forces Drs...

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The Physics of Light & Sound Forces Drs. Paulson and Scully GSCI 121 Summer 2011 Lecture 2

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Acceleration due to gravity If I drop two objects of different mass from the same height, which one hits the ground first? It was Galileo who reasoned that both objects would hit the ground at the same time. Gravity produces a constant acceleration which we call g or the acceleration due to gravity. Near the Earth it has a value of 9.8 m/s2.
Forces & Newton’s Laws For every action, there is an equal and opposite reaction. F=m a An object in uniform straight motion tends to stay in that motion. An object at rest tends to stay at rest unless acted upon by a force. The force is equal to the mass of the object multiplied by the acceleration applied to it.

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Forces & Newton’s Laws The first law is also known as the law of inertia : an object’s resistance to change its state of motion. It tells us that a FORCE is required to change the motion F = ma, relates force and inertia (mass).
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sum_lecture02 - T he Physics of L ight Sound Forces Drs...

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