Using the language of conservation of energy, discuss why or why note friction is a considered a non-conservative force. Does it keep energy for future consumption? Why and how? 2. A 2.0 lb. rock and a 20.0 lb. rock are dropped from rest at 50.0 m above the ground. Ignoring air resistance, which of the following statements about the rocks are true or false? Justify why each statement is true of false. a. Both rocks have equal initial gravitational potential energy. b. Both rocks will have equal acceleration as they fall. c. Both rocks will have equal speed upon striking the ground.
Using the language of conservation of energy, discuss why or why note friction is a considered a non-conservative force. Does it keep energy for future consumption? Why and how?
2. A 2.0 lb. rock and a 20.0 lb. rock are dropped from rest at 50.0 m above the ground. Ignoring air resistance, which of the following statements about the rocks are true or false? Justify why each statement is true of false.
a. Both rocks have equal initial gravitational potential energy.
b. Both rocks will have equal acceleration as they fall.
c. Both rocks will have equal speed upon striking the ground.
d. Both rocks will have equal kinetic energy upon hitting the ground.
3. A German Shepherd dog bounces on a trampoline. It goes slightly higher with each succeeding bounce. Explain how the dog raises the total mechanical energy.
4. Friction force can increase the total mechanical energy of a system. Is the statement true or false? Support your answer. If so, provide two (2) examples.
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