Act_6 - Name _ Section _ Period 6 Activity Sheet: Energy...

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21 Name ________________________ Section ___________________ Period 6 Activity Sheet: Energy and Work 6.1 How Do We Measure Work and Energy? a) Work is done when a force moves an object. Work and energy are measured in units of joules. 1 joule = 1 kg m 2 /s 2 Force is measured in units of newtons. 1 newton = 1 kg m/s 2 Explain why a joule can also be called a newton meter. b) This activity illustrates the amount of energy in one joule. Lift the 1 newton plastic apple up a distance of 1 meter. How much work did you do on the apple? _____________ How much energy did you exert? (Assume no energy was wasted.) __________ 6.2 How Does the Work Done Compare to Potential Energy Gained? a) Work : Your instructor will demonstrate potential energy with a model pile driver. 1) The pile driver mass is 4 kilograms. What is its weight in newtons? ___________ 2) How much force is necessary to raise the mass at a constant velocity? _____ 3) To what height was the pile driver mass raised? ___________ 4) How much work was done to raise the mass to this height? ___________ b) Potential Energy : 1) How much potential energy did the mass have before it was raised? ______ 2) How much potential energy does the mass store when it is raised? ________ 3) The mass is now allowed to drop. What form of energy does the mass have just before it hits the metal stand at the bottom? ______________________ c) Group discussion question: Is the amount of energy the mass had just before it hits the same as the amount of gravitational potential energy it had when it was raised? Why or why not?
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22 6.3 What Happens to Stored Potential Energy? a)
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Act_6 - Name _ Section _ Period 6 Activity Sheet: Energy...

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