Question

Lenore is on an inclined plane next to her truck. Holding her hands steady, she pushes a box up the plane and into her truck. Where can energy be lost?
(1 point)
• Friction between Lenore's hands and the box.
• Friction between Lenore and the ground.
O Friction between the box and the inclined plane.
• Friction between the truck and the inclined plane.

Answer 1

Energy is lost where there is slipping (kinetic friction): between Lenore’s hands and the moving box, and between the box and the inclined plane. Static friction (Lenore on the ground, truck on the plane) does no work so it doesn’t dissipate energy unless they slip.