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Unformatted text preview: PHY101: Fun w/ forces and work w/ energy http://www.cartoonstock.com/directory/i/issac newton.asp Newton’s Laws • 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! Different kinds of forces • Contact Forces • Friction forces, tension forces, normal forces, air resistance, applied forces • Actionatadistance forces • Electrical forces, gravitational forces, magnetic forces Normal force Normal force : A contact force perpendicular to the contact surface that prevents the two objects from passing through one another. (weight) W N (normal) Frictional force Friction: A contact force parallel to the contact surface....
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 Fall '08
 Schwarz
 Energy, Force, Inertia, Work, Gravitational forces, · Electrical forces

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