friction friction – a force that opposes motion between 2 surfaces that are touching. –always...
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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
On Earth
Weight = 120 lbsMass = 46.36 kg
On the Moon
Weight = 20 lbsMass = 46.36 kg
In Space
Weight = 0 lbsMass = 46.36 kg
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