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Science (Sec.4) > Chapter 3 -Energy > Flashcards

Chapter 3 -Energy Flashcards

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1
Q

What is energy?

A

the ability to do work

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2
Q

What is work?

A

force is applied to an object that moves

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3
Q

How is energy measured?

A

joules=> 1 joule=1 newton x 1 meter

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4
Q

What is elastic energy?

Examples?

A

energy stored in an object because it is compressed or stretched
Examples: spring, elastic hair band

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5
Q

What is electrical energy?

Examples?

A

energy resulting from ordered movements of electrons from one atom to another
Examples: power plants, generators

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6
Q

What is thermal energy?

Examples?

A

energy resulting from random motion of all particles in a substance
Examples: putting pot of water on the stove to boil

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7
Q

What is radiation energy?

Examples?

A

energy contained in and transported by electromagnetic waves

Examples: microwaves

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8
Q

What is chemical energy?

Examples?

A

Energy stored in molecular bonds

Examples: fossil fuels, candles

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9
Q

What is wind energy?

Examples?

A

Energy from movement of air

Examples: wind turbines

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10
Q

What is sound energy?

Examples?

A

Energy transported from sound waves

Examples: sound waves from singing, musical instruments

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11
Q

What is hydraulic energy?

Examples?

A

Energy from the flow of water

Examples: waterfall, river

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12
Q

What is nuclear energy?

Examples?

A

Energy stored in atomic nuclei

Examples: atomic nuclei

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13
Q

What is the law of conservation of energy?

A

Energy is never created or destroyed => it is transformed

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14
Q

What is energy transfer?

A

The transfer from one point to another (same type of energy)

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15
Q

What is energy transformation?

A

When one energy is converted into another type of energy

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16
Q

What is the formula for energy efficiency?

A

(amount of useful energy/energy consumed) x100= %e.e.

17
Q

What is thermal energy?

A

total amount of energy contained in the substance that depends on the number of particles and their temp.

18
Q

What is temperature?

A

measure of the speed (degree of agitation) of the particles in a substance. the faster the particles move, the higher the temp.

19
Q

What is heat?

A

the transfer of thermal energy between 2 substances or environments. Heat always passes from warmer to cooler environments or substances

Science (Sec.4) (8 decks)

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