Work-Energy Theorem.

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Presentation transcript:

Work-Energy Theorem

Release pendulum, let it die. Wonder where energy went

If outside forces do work on an object, the TME can change. Work-Energy Theorem work done by an outside force is equal to the change in the kinetic energy.

W = ∆KE = Kf - Ki

Example 1 A 1000-kg car traveling with a speed of 25 m/s skids to a stop. The car experiences an 8000 N force of friction. Determine the stopping distance of the car.

Example 2 A shopping cart full of groceries is sitting at the top of a 2.0-m hill. The cart begins to roll until it hits a stump at the bottom of the hill. Upon impact, a 0.25-kg can of peaches flies horizontally out of the shopping cart and hits a parked car with an average force of 500 N. How deep a dent is made in the car (i.e., over what distance does the 500 N force act upon the can of peaches before bringing it to a stop)?

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