2.  The ability to do work.

3.  Energy of rest, no motion.

4.  Energy of motion.

5.  Potential energy + Kinetic Energy  Ex: riding a bike  Ex: bouncing a ball

6.  Energy is neither created nor destroyed.

7.  d. potential energy and kinetic energy

8.  b. sound

9.  c. heat

10.  c. mass and speed

11.  d. a person lifting a weight

12.  b. kinetic energy of the fan blades

13.  d. kinetic energy

14.  d. position

15.  In illustrations A and B…..  Points 1 & 5….top of the ramp hill.

16.  Point 1 because he will not be at rest until the top of the other side of the ramp.

17.  No, because illustration A will have a stronger pendulum effect of gravitational potential energy.

18.  Energy seems to decrease in illustration A because the momentum slows down as the skater reaches the middle of the ramp.  Gravitational potential energy causes unwanted forms of energy. (a person falling….loss of thermal & chemical energy)

20.  Plants & solar cells use energy from the sun.  Plants = use photosynthesis to grow chemically.  Solar Cells = capture sunlight to store and use as thermal or electrical energy, etc.

21.  Not all places on Earth have alot of wind or sunlight.  Stop Thermal Pollution, use generators for electricity, solar panels and power plants.

22.  The 2 nd air conditioner is more energy efficient because it is not wasting thermal energy.

23.  100 units  - 60 units 40 units vacuum suckage

24.  Riding a bike = chemical  kinetic  potential  kinetic  Fan = electrical  mechanical  sound  Light bulb = electrical  thermal  light