1) I hold my 2 kg pillow out of a 20 m window above the ground. Then, I let it go. - What is the pillow's gravitational potential energy before I let go? - What is the pillow's kinetic energy before I let go? - What is the pillow's gravitational potential energy right before it hits the ground? - What is the pillow's kinetic energy right before it hits the ground (assuming no energy is lost to friction)?

2) Name the forms of energy involved in these transformations (one form of energy to another form of energy). Example: Person walks up stairs: Mechanical kinetic energy to gravitational potential energy. - A person carries a box to the elevator - The person pushes the button on the elevator, and it lights up - The electric elevator makes a dinging noise - An electric elevator lifts up a set of boxes - Where might thermal energy also be involved in these transformations? - Discuss how one of the examples show the transformation from kinetic to potential energy.