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Unformatted text preview: PHY101: Is gravity getting you down?: Forces http://www.cartoonstock.com/lowres/rmc0074l.jpg Forces • Newton’s First Law: An object’s velocity does not change if and only if the net force acting on the object is zero • Inertia is an object’s resistance to changes in its velocity. What is “net” force? What is “net” force? Force is a vector , and the net force, F net , on an object is the vector sum of all the forces acting on an object. Forces • Newton’s First Law: An object’s velocity does not change if and only if the net force acting on the object is zero; inertia • For an object in equilibrium, Σ F x = 0 and Σ F y = 0 . • Newton’s Second Law: F = m a , where m is the object’s mass. Forces • Newton’s First Law: An object’s velocity does not change if and only if the net force acting on the object is zero; inertia • For an object in equilibrium, Σ F x = 0 and Σ F y = 0 . • Newton’s Second Law: F = m a , where m is the object’s mass. • Newton’s Third Law: In an interaction between two objects, each object exerts a force on the other. These two forces are equal in magnitude and opposite in direction—forces exist in pairs! Gravity...
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 Fall '08
 Schwarz
 Resistance, Force, Gravity, Inertia, Mass

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