Energy Conversions & Forms

Identify equivalent terms for stored energy and energy of motion.

• Energy of motion is potential energy, and stored energy is kinetic energy.

• Stored energy is the potential as well as the kinetic energy of the system.

• Stored energy is potential energy, and energy of motion is kinetic energy.

• Energy of motion is the potential as well as the kinetic energy of the system.

Describe the transformation between forms of mechanical energy that is happening to a falling skydiver before his parachute opens.

• Kinetic energy is being transformed into potential energy.

• Potential energy is being transformed into kinetic energy.

• Work is being transformed into kinetic energy.

• Kinetic energy is being transformed into work.

If a rock is thrown into the air, the increase in the height would increase the rock’s kinetic energy, and then the increase in the velocity as it falls to the ground would increase its potential energy. True or False?

• True

• False

A child slides down a playground slide. If the slide is 3 m high and the child weighs 300 N, how much potential energy does the child have at the top of the slide?

• 0 J

• 100 J

• 300 J

• 900 J

A 0.2 kg apple on an apple tree has a potential energy of 10 J. It falls to the ground, converting all of its PE to kinetic energy. What is the velocity of the apple just before it hits the ground?

• 0 m/s

• 2 m/s

• 10 m/s

• 50 m/s

Principle of conservation of energy implies that total energy of a system stays constant

• True

• False

Energy is measured in

• N

• J

• W

• m/s

• 620 000 J

• 62 000 J

• 310 000 J

• 3100 kJ

Joey and Rachel want to lift thier TV to the third floor. Whose TV gains the largest GPE?

• Joey's TV

• Rachel's TV

• Both their TVs

How fast must a 3000 kg elephant move to have the same kinetic energy as a 60 kg sprinter running at 10 m/s?

• 1.4 m/s

• 2.4 m/s

• 3.4 m/s

• 5 m/s