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# OAT Physics

### Chapter 3 - Work, E, and Momentum

TermDefinition
Work F acting on an object which moves through a distance d; = Fd cos theta
When F and d are perpendicular No work is done cuz cos 90 = 0
Power rate at which work is done; Watts = J/s
Kinetic E E of motion; = 1/2 mv^2
Potential E E of position; = mgh
When mechanical E is not conserved... E is drained away in form of heat
Mechanical E KE + PE = total E
W when is comes to mass and velocity = change in KE
Non-conservative Force friction
Conservation of E when the work done by non-conservative forces is zero (no air resistance), E is conserved and E = KE + PE
Pulleys these allow F to be reduced but distance that the force is exerted over is increased to compensate
Efficiency (Pulley) W out/W in ; load x load distance/effort x effort distance
effort distance load distance multiplied by the number of pulleys present
Momentum p = mv
Impulse J = Ft = change in momentum
Conservation of Momentum (collisions) Total p initial = Total p final; (p of object a)(p of object b)i = (pa)(pb)f
Completely inelastic collisions objects stick together after the collision; only momentum conserved
Completely elastic collisions objects dnt stick together after collision; KE is conserved; use momentum AND KE equations here
Center of Mass Equation X = (m1x1 + m2x2) / m1 +m2; x is the center point of the object. If a cube has a length of 4m, x would be at 2m
Created by: JaeBae4444