Energy Mrs. Wolfe. Two Forms of Energy Kinetic Energy – of MOTION Potential Energy – STORED Energy ENERGY.

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Presentation transcript:

Energy Mrs. Wolfe

Two Forms of Energy Kinetic Energy – of MOTION Potential Energy – STORED Energy ENERGY

Time for a game! SIMON SAYS! –Kinetic energy: JUMP –Potential energy: STAND STILL

Kinetic Energy Energy of Motion KE = ½ mv 2 80 km/h truck 50 km/h motorcycle Which has the most KE? Which has the least KE? 80 km/h 50 km/h 80 km/h

Practice Problem: Homer Simpson sends a bowling ball toward Bart’s head at a velocity of 200 m/s. The bowling ball has a mass of 20 kg. How much kinetic energy does this ball have? KE = ½ mv 2 KE = ½ x 20 x (200) 2 KE = 400,000 J *ALWAYS do the square first!!

UNITS!??! Energy is measured in JOULES (J).

Potential Energy Stored Energy PE = mgh G = 9.8 m/s/s Which boulder has MORE PE?

Potential Energy What other ways can an object store energy?

Look at Potential Energy! Time for VIDEOS!!

Practice Problem: What is the potential energy of EACH plane? PE = mgh PE = (800)(9.8)(10,000) PE = 78,400,000 J PE = (800)(9.8)(9,000) PE = 70,560,000 J

Time for a WS then a Lab! Kinetic & Potential Energy Math WS Kinetic & Potential Energy Lab

Specific Forms of Energy Mechanical – Thermal – Sound – Electromagnetic Chemical –

Mechanical Energy Energy of moving objects –Car traveling down the road –Ball flying through the air –Windup toy walking –You picking up a glass

Thermal Energy Heat Energy; occurs when atoms vibrate faster (friction) –Heating water –Fire

Sound Energy Vibration of atoms in the air that hit our eardrum and register in our brains as sound. –Crackling –Popping –Banging –Etc.

Electromagnetic Energy Energy from forces between positive and negative charges in matter. –Electricity –Magnetism –Light (includes invisible light such as ultraviolet, infrared, etc.)

Chemical Energy Energy that comes from forming or breaking bonds –Signs of a chemical reaction –Batteries –Airbags

Transformations of Energy DEMONSTRATION Potassium Permanganate + Glycerine = Surprise FIRE! List the energy transformations.

Time for a Lab! Transformations of Energy Lab

The Law of Conservation of Energy Energy cannot be created or destroyed, but it can be transformed. Sound familiar? What does this remind you of….?

Pendulum Demonstration

Newton’s Cradle Demonstration

Time for a Lab! Basketball Blaster Lab

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