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Unformatted text preview: PHY101: Fun w/ forces and work w/ energy http://www.cartoonstock.com/directory/i/issac- newton.asp Newtons Laws Newtons First Law: An objects velocity does not change if and only if the net force acting on the object is zero; inertia For an object in equilibrium, F x = 0 and F y = 0 . Newtons Second Law: F = m a , where m is the objects mass. Newtons 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 directionforces exist in pairs! Different kinds of forces Contact Forces Friction forces, tension forces, normal forces, air resistance, applied forces Action-at-a-distance 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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