Potential Energy And Energy Conservation Flashcards
(4 cards)
0
Q
What is the equation for gravitational potential energy?
A
U(grav) = mgy
1
Q
What is the equation for work done by gravity?
A
W(grav) = F.s = w(y1-y2) = mgy[1] - mgy[2]
2
Q
What is the total mechanical energy of a system?
A
E = K + Ugrav - system means the body of mass m and the earth together, because potential energy U is a shared property of both bodies.
3
Q
When is it that energy is conserved mechanically?
A
When only Gravity is doing work - that is to say, that the total of the kinetic and potential energy stay constant.
