Four sleds are pulled up the hill. The table below shows the weight of each sled and it’s charge in height after being pulled up the hill. Which pair of sleds have the same change in potential energy ? PE=mgh and Fg (weight) =mg

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As a car drives with its tires rolling freely without any slippage, the type of friction acting between the tires and the road is 100) a) static friction. b) kinetic friction. c) a combination of static and kinetic friction. d) neither static nor kinetic friction, but some other type of friction. e) it is impossible to tell what type of friction acts in this situation.

Does current flow through or across a resistor?