e) The greater the "wind resistance friction," the_ converted to heat. Conservation of Energy (concept): 1. Saying that "Energy is Conserved" means that energy never _appears or dissapears . When we say that something "lost energy" we really mean that some of the energy was converted into a form that is useless to us. 3. A skier at the bottom of a hill has 900J of kinetic energy. After sliding a ways along the flat, the kinetic energy is 300J. a) With a decreased kinetic energy, what do you know about the skier's velocity? Why? The Skiers velocity will also decrease b) With the skier sliding on a flat surface, is there any change in gravitational potential energy? How do you know ? No, Ep =mah height was not changed theis Ep isn't c) How much energy was lost due to friction? (Use Ebefore = Eafter). Show all steps. 4. A skier on a hill has 4000J of kinetic energy and 3000J of potential energy. After sliding down the hill a ways, their potential energy is 2000J. a) Since they slid "down" the hill, what do you expect for change in potential energy (greater or less)? Why? Less because Ep = mgh and the height decreased b) Assuming that there is no loss due to friction, what would be the kinetic energy at the second position? (Use Ebefore = Eafter and show all steps) c) Since there's always "some" friction loss, would the "actual" kinetic energy be less or more than your answer in b)? Less because its tesned into Eh 2022-01-14 Page 2 of 19