1.)work, it changes the amount of power used
2.)3 times the work
3.)they are the same
4.)1000J
5.)200W & 100W
6.)potential and kinetic energy
7a.)100J
b) 200J becausze it's twice the height as A
8.)200J
9.)4000J & 6000J
10.) 50J
11.)It means that energy will always be the same no matter how you change it
12.)
13.)Because it is like a machine that transforms chemical energy stored in fuel into mechanical energy
14.)Levers and pulleys are machines that can alter the input force
15.)We put force on one end and it is makes the other end do the opposite
16.)That the ratio outout force is compared to the input force of a machine
17.)type 2
18.) effiency = 0.35J
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