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Name __________________ Section Period 8 Exercises: Energy Conservation and Efficiency Write answers to the questions below. Show your math steps and units. This sheet With your answers shouid be turned in at the beginning of Period 9. 1 . Doing work against gravity and friction: How much work must be done to push a 20 pound box to the top of this ramp? 13 feet 5 feet . _12 feet a) How much work against gravity is needed to raise the 20 pound box up 5 feet? .b) How much work against friction is needed to push to the box along the 13 foot ramp if the force of friction between the ramp and the box is 12 pounds? c) What is the total work needed to move the box up the ramp