Energy Mrs Wolfe Two Forms of Energy ENERGY

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Energy Mrs. Wolfe

Energy Mrs. Wolfe

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

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

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

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

Kinetic Energy • Energy of Motion • KE = ½ mv 2 • Which

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

Practice Problem: • Homer Simpson sends a bowling ball toward Bart’s head at a

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).

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

Potential Energy • Stored Energy • PE = mgh • G = 9. 8

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?

Potential Energy • What other ways can an object store energy?

Look at Potential Energy! Time for VIDEOS!!

Look at Potential Energy! Time for VIDEOS!!

Practice Problem: • • • What is the potential energy of EACH plane? PE

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

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

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

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

Mechanical Energy • Energy of moving objects – Car traveling down the road –

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

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

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. –

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

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

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

Time for a Lab! • Transformations of Energy Lab

Time for a Lab! • Transformations of Energy Lab

The Law of Conservation of Energy • Energy cannot be created or destroyed, but

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

Pendulum Demonstration

Newton’s Cradle Demonstration

Newton’s Cradle Demonstration

Time for a Lab! • Basketball Blaster Lab

Time for a Lab! • Basketball Blaster Lab

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