02_E2_ws1_key

# 02_E2_ws1_key - E&MUnitII:Worksheet1Key...

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E&M Unit II: Worksheet 1 Key Fields, Potential, and Energy 1. Two books, initially on the floor, are picked up and placed on a shelf 2.0 m off the floor. One, Twenty Other Things I Like To Do With That Stuff Between My Toes , has a mass of 1.0 kg. The other, Why Physics Rules The Universe , has a mass of 2.0 kg. The gravitational field strength near the surface of the Earth is approximately 10 N/kg. a. Calculate the gravitational force acting on each book as it rests on the shelf. What factors determine the size of this force? F g =mg = (10N/kg)1.0kg = 10N (book 1) F g = (10N/kg)2.0kg = 20N (book 1) The mass of the book is the main factor as close to the earth’s surface the gravitational field strength is a constant 10 N/kg. b. Calculate the change in the gravitational potential energy stored in the gravitational field as a result of each book being picked up off the floor and placed on the shelf. What factors determine the size of this change? E g = mg h = 10N(2.0m) = 20J E g = mg h = 20N(2.0m) = 40J The mass of the book and the height the book is raised.

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