Which Path Requires the Most Energy? Suppose that a car traveled up
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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 work done transferred by a force is called the w d by that force. WORK DONE ENERGY TRANSFERRED
Work-Energy Principle Whenever w is done on an object, it’s energy changes.the energy is t Work (F d) to that object transferred
Work-Energy Principle
Work-Energy Principle This actually a special caseFormulas: of the Conservation of Worknet ΔKE Energy 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 k g 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?
