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11 Cards in this Set
- Front
- Back
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Work
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Accumulated force for the displacement in motion, W=∫ F*dr. |
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Energy
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Ability to do work. |
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Kinetic Energy
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Energy associated with the motion of an object, KE=1/2mv^2 |
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Work Energy Theorem
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Work done on an object is the same as the change in kinetic energy of the object. W=ΔKE=1/2mvf^2-1/2mvi^2
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Power
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Amount of work done per unit time. P=dw/dt |
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Potential Energy
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Conservative Force
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Work done by conservative forces is not dependent on the path of the motion of the object.
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Gravitational Potential Energy
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P.E. associated with gravitational force of Earth, work done by Earth's gravity to bring a mass to the position from infinity. U(y)=mgy.
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Conservation of Mechanical Energy |
In an isolated system where only conservative forces cause change, the K.E. and P.E. can change, but their sum, the mechanical energy, E_mech of the system cannot change.
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Turning Point
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When the Mechanical energy of an object is the same as its P.E. (K.E.=0) the object will stop momentarily and change its direction.
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Unstable Equilibrium
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Potential energy, U, is maximum, no force at the equilibrium, but non zero pushing away force near it. If E_mech=U it will stay at this equilibrium.
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