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