[Potironette]

"Transfer of energy" isn't jargon; it's not a piece of scientific vocabulary that always has to be used a certain way or you're wrong. When I say that, I really just mean that energy is moving from one place to another, or from one state to another. (Converting potential energy to kinetic is work, done by the force of gravity.)

Ohh, okay. I wasn't too sure what transferring energy referred to ^^;;.


I'm doing homework again, and I'm stuck on a question that reads: "A 2.1E3 kg car starts from rest at the top of a driveway that is sloped at the angle of 20.0 degrees with the horizontal. An average friction force of 4E3 N impedes the car’s motion so that the car’s speed at the bottom of the driveway is 3.8 m/s. What is the length of the driveway?"

I actually did find how to solve for my homework problems here,
but I don't really understand what I'm supposed to be thinking, and I don't understand how or why I'm meant to relate net force to kinetic friction...I think I just don't understand what there is to understand about work and kinetic energy :/