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18 Cards in this Set

  • Front
  • Back
W = Fdcos theta, theta - angle between Fand d
When F is parallel to d, W= Fd
Scalar(no direction)
Work done by normal force
0 (perpendicular, cos90 = 0)
Work/time = W/t
Kinetic Energy
Energy due to motion = 1/2 mv^2
Work Energy theorem
W = KE final-KE initial
Potential Energy
Energy an object has by virtue of its position
PE = mgh
Work done by gravity
depends only on initial and final positions of the object, independent of the path, gravity - conservative force
Is friction a conservative force?
No, friction depends on the path object takes
Total Mechanical Energy
Conservation of Total Mechanical Energy
KEi + PEi = KEf + PEf
Heat transfer
1 conduction (hot skillet--->hand)
2.convection (by motion of fluid)
3.radiation - absorption of energy carried by light waves)
p= mv
J = change in momentum
Conservation of momentum
total P initial = total p final
Elastic Collision
Total momeentum and total KE are conserved
Inelastic Collision
Total momentum is conserved but total kinetic energy is not conserved
Perfectly inelastic collision
Objects stick together afterwards
Angular Momentum
L= Iw, conserved