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Friction • Friction – a force that opposes motion between 2 surfaces that are touching. – Always acts in a direction opposite to the motion of the object. – The greater the friction, the faster an object will lose speed. FRICTION TYPES OF FRICTION EXPLANATION Sliding A hockey puck crossing an ice rink Rolling A wheeled cart being pushed Fluid Air rushing past a speeding car Static A crate resting on a loading ramp Energy of Motion • Kinetic Energy – Energy in a moving object. – More speed or more mass = more kinetic energy • Potential Energy – Energy stored in an object because of position – High diver on the board – lots of potential energy – Becomes kinetic energy when he dives! Mass vs. Weight • Mass = amount of matter in an object • Weight = force of gravity on an object – NOT THE SAME THING!!! – Weight = gravity x mass In Space On Earth Weight = 120 lbs Mass = 46.36 kg Weight = 0 lbs On the Moon Mass = 46.36 kg Weight = 20 lbs Mass = 46.36 kg