# Lecture06 - Racquetball Striking a Wall Application of...

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Application of General Physics I Mechanics Racquetball Striking a Wall Newton’s Laws Physics 140 Mt. Etna Stewart Hall

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Clicker Question • Leaving class early en masse is A. Disruptive to the class B. Disrespectful to your classmates C. Detrimental to your knowledge (fewer problems solved and fewer topics discussed) D. Harmful to your grade E. All of the above
Clicker Question • Leaving class early en masse is A. Disruptive to the class B. Disrespectful to your classmates C. Detrimental to your knowledge (fewer problems solved and fewer topics discussed) D. Harmful to your grade E. All of the above

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Newton’s Laws • If the vector sum of all forces acting on a body is zero (i.e. the total force acting on the body is zero ), then the body experiences no acceleration and moves with constant velocity in a straight line (or stays at rest) • If the vector sum of all forces acting on a body is not zero (i.e. the total force acting on the body is not zero), then the velocity of the body is changing (in magnitude or direction) and the acceleration of the body is given by where m is the body’s mass = = F m F m a total r r r 1 1
Forces • In physics, force is a measure of interactions between two bodies • Forces are vectors : have both magnitude and direction orces on a given body are produced by ther • Forces on a given body are produced by other bodies acting upon it

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Lecture06 - Racquetball Striking a Wall Application of...

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