Which Path Requires the Most Energy?

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Presentation transcript:

Which Path Requires the Most Energy? Suppose that a car traveled up three different roadways (each with varying incline angle or slope) from the base of a mountain to the summit of the mountain. Which path would require the most gasoline (or energy)?

Work-Energy Principle In order to transfer energy to an object, you have to exert a ___________ on that object Force

Work-Energy Principle The amount of energy transferred by a force is called the w__________ d_________ by that force. work done WORK DONE= ENERGY TRANSFERRED

Work-Energy Principle Whenever w_____ is done on an object, it’s energy changes...the energy is t________ to that object Work (F•d) transferred

Work-Energy Principle

Work-Energy Principle This actually a special case of the Conservation of Energy Formulas: Worknet =ΔKE =KEf- KEi = ½mv²f- ½mv²i F•d = ΔKE

Work-Energy Principle

Work-Energy Principle #10 Homework Worknet= ΔKE F•d = ½mv²f- ½mv²i A 13g bullet is accelerated in a rifle barrel 46.8 cm long to a speed of 522 m/s, use the work-energy theorem to find the avg Force exerted on the bullet while being accelerated

Work-Energy Principle #9 Homework Worknet= ΔKE mgh = ½mv²f- ½mv²i A 0.8 kg rock slides horizontally off a table from a height of 1.2 m. The speed of the rock as it leaves the thrower’s hand at the edge of the table is 2 m/s. 1) Solve for time What is the KE of the rock just before it hits the floor?

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