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PhysI_09292009 (Repaired)

# PhysI_09292009 (Repaired) - g(which is Accelerating Up FBD...

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F G F G F N F N Accelerating Down Accelerating Up Constant Still T T 2T T T FBD on pulley system (which is massless/frictionless) FBD on weight/man mg mg T T 8 kg • g T A T C B 8 kg • g 6 kg • g 10 kg • g T A T C C A 09-29-2009 171.101, General Physics for Physical Science Majors I Aside from P. Henry: Friction created by irregular intermolecular forces between object and surface. Newton’s Second Law of Motion: F = ma, so a = F/m e.g. Weight on fan slows it down: Greater mass, same force, lower acceleration. Look on page 17 of Book: Schrodinger Equation---real measure of mass/acceleration of a particle. Types of Force F m a SI Units N kg m/s 2 cgs dyne g cm/s 2 Clicker Question: The force the man exerts on the Earth is equal to the force that the Earth exerts on the man and vice versa: Newton’s Third Law: For every force there is an equal and opposite reaction. Mass: resistance to acceleration Weight: the FORCE needed to support the body against gravity

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