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core physics > Physics 1a - energy > Flashcards

Physics 1a - energy Flashcards

1
Q

Name 3 ways heat is transferred?

A

Radiation
Convection
Conduction

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2
Q

What is heat radiation?

A

The transfer of heat energy by Infrared Radiation.

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3
Q

What do conduction and convection involve?

A

The transfer of energy by particles.

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4
Q

What can infrared radiation be emitted by?

A

Solids
Liquids
Gases

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5
Q

What is infrared radiation?

A

The emission of electromagnetic waves

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6
Q

What surfaces absorb infrared radiation better?

A

Dark
Black
Matt

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7
Q

What surfaces reflect infrared radiation?

A

Light
Shiny
White

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8
Q

Solids?

A

Strong forces of attraction hold their particles close together in a fixed, regular arrangement. Don’t have much energy - vibrate.

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9
Q

Liquids?

A

Weaker forces of attraction between the particles - particles are close together but can move past each other - irregular arrangements. Move in random directions @ low speeds.

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10
Q

Gases?

A

Almost no forces of attraction between the particles. Particles have more energy than those in liquids and solids - free to move - travel in random directions @ high speeds.

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11
Q

What happens when you heat a substance?

A

Give its particles more kinetic energy.

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12
Q

What is the conduction of heat energy?

A

Vibrating particles pass on their extra kinetic energy to neighbouring particles.

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13
Q

Why are metals good conductors?

A

They have free electrons.

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14
Q

Where does convection occur?

A

Liquids and gases only.

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15
Q

When does convection occur?

A

More energetic particles move from hotter region - cooler region and take their heat energy with them.

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16
Q

What are convection currents all about?

A

The changes in density.

17
Q

What do U-Values show?

A

How fast heat can transfer through a material.

18
Q

What does heat transfer faster through?

A

Materials with higher U-Values

19
Q

The better the insulator?

A

The lower the U-Value.

20
Q

What is specific heat capacity?

A

How much energy stuff can store.

21
Q

Kinetic energy?

A

Moving energy

22
Q

Thermal energy?

A 
Movement of particles
Heat energy (kinetic energy)
23
Q

Light energy?

A

Electromagnetic wave

24
Q

Gravitational potential energy?

A

Strength of gravity.

25
Q

Chemical energy?

A

Energy stored in a battery/food/fuel.

26
Q

Sound energy?

A

Vibration of air particles.

27
Q

Electrical energy?

A

Energy given/taken from charge.

28
Q

Elastic potential energy?

A

Energy stored when a force changes the objects shape.

29
Q

Nuclear energy?

A

Energy released when nuclear decay/fission happens.

core physics (2 decks)

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