7-2 Kinetic Energy and work-Energy Theorem

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7-2 Kinetic Energy and work-Energy Theorem

• Work

Example
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• Ex.

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Definition of Kinetic Energy, K
SI Unit. Kg(m/s)2 Joule
Work-Energy theorem
Total work done on objectchange in kinetic energy
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• How much work is required?

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Lifting a box

• Find work done by force-lift
• Work done by gravity
• Find final speed

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Pulling a sled
µk0.1

• find final speed of the sled?

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7-3 Power

• Power is measure of how quickly work is done.
• PW/t
• SI Unit J/swatt, W