Energy conversions

Presentation

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Science

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9th Grade

•

Practice Problem

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Easy

•

NGSS

HS-PS3-3, HS-LS1-5, MS-PS3-1

Standards-aligned

Jill Weth

Used 93+ times

FREE Resource

9 Slides • 6 Questions

Energy Conversions

A pendulum swinging back and forth would be converting between potential and kinetic energy.

Elastice Potential is energy that is being stored due to a stretched or compressed material.

Multiple Choice

What type of energy conversion takes place in a toaster?

Electrical to Chemical

Electrical to Thermal

Chemical to Radiant

Thermal to Chemical

Multiple Choice

What type of energy conversion takes place in photosynthesis?

Chemical to Radiant

Electrical to Thermal

Thermal to Kinetic

Radiant to Chemical

This equation will help you keep track of Mechanical Energy during common conversions!

Notice as the pendulum swings, it will always have the same TE (TOTAL ENERGY).

highpoint of the swing = high PE and low KE.

lowpoint of the swing = high KE and low PE.

Notice that the Total Energy is always 50,000 J

Notice that the red KE column and Blue PE column always add up to the yellow Total Mechanical Energy Column!

Notice at the beginning there are a total of 40,000 J of energy.

Multiple Choice

How much KE is there at point B?

80,000 J

0 J

20,000 J

25,000 J

Multiple Choice

How much PE is there at point F?

40,000 J

0 J

20,000 J

5,000 J

Why doesn't the ping pong ball bounce back up to the original height?

Multiple Choice

What does the word dissipate mean?

shock

seem to vanish

to let someone down

to expect with excitement

Poll

If I can ignore energy dissipated due to things like heat, sound & friction, I can track the kinetic energy and potential energy in a given situation.

Yes, definitely!

Probably, but I'd like more examples.

I don't even know what kinetic and potential energy are!

Energy Conversions

A pendulum swinging back and forth would be converting between potential and kinetic energy.

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