 The ability to do work.  Energy of rest, no motion.

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Presentation transcript:

 The ability to do work.

 Energy of rest, no motion.

 Energy of motion.

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

 Energy is neither created nor destroyed.

 d. potential energy and kinetic energy

 b. sound

 c. heat

 c. mass and speed

 d. a person lifting a weight

 b. kinetic energy of the fan blades

 d. kinetic energy

 d. position

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

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

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

 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)

 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.

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

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

 100 units  - 60 units 40 units vacuum suckage

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

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