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Science Year 9 > Physics Term 2 > Flashcards

Physics Term 2 Flashcards

1
Q

Reflection

A

The bouncing of light off something

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2
Q

How is sound produced?

A

Sound is produced when something vibrates, moving back and forth very quickly

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3
Q

Compression

A

A region of high pressure in which particles are close together

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4
Q

Rarefaction

A

A region of low pressure in which particles are far apart

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5
Q

Why does sound travel?

A

Sound travels because the vibrating objects make nearby particles vibrate

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6
Q

What does sound need to travel?

A

Sound needs a medium to travel through. It cant travel through a vacume

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7
Q

Amplitude

A

Loudness of a sound shown by the height of the wave

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8
Q

Frequency

A

Pitch of a sound shown by how many waves there are

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9
Q

Refraction

A

The bending of light as it passes from one substance to another

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10
Q

Longitudinal wave

A

Vibrations in the same direction as the wave travelling

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11
Q

Transverse Waves

A

Vibrations at a right angle in the direction the wave is travelling

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12
Q

Light

A
  • Travels in a wave and carries energy

- Travels in a straight line

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13
Q

How fast does light travel

A

300 000 000 meters per second

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14
Q

Light is a form of…

A

Energy that can be changed from one form into another

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15
Q

Radiated heat…

A

Travels through space from the sun->earth as infrared radiation

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16
Q

Gamma rays

A
  • emitted by certain radioactive material and have many uses in medicine
  • the higher energy form of electromagnetic radiation
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17
Q

Electromagnetic radiation

A

Eg. Light, microwaves, x-rays

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18
Q

What type of wave is EMW

A

EMW are transverse waves made up of electric and magnetic fields

19
Q

The shorter the wavelength…

A

The higher its energy

20
Q

How fast does EMR travel in a vacume?

A

300 000 000 m/s

21
Q

Higher the frequency…

A

The higher the energy

22
Q

The shorter the wavelength…

A

The higher the frequency

23
Q

Temperature

A

Measurement of how hot and cold an object is. Determined by the average kinetic energy of the particles in an object

24
Q

Heat

A

Energy transfer that takes place between objects of different temperature. Measured in Joules

25
Q

Heat transfer

A

Only occurs when there is a temperature difference between substance. Heat always moves from an area of higher temperature to an area of lower temperature. Conduction, convection, radiation

26
Q

Absolute zero

A
  • 459F
  • 275C
  • 0K
27
Q

Conductor

A

Substance that allows heat to flow through it

28
Q

Insulator

A

Material that does not conduct heat well

29
Q

Electrical circuits

A

Path down which electrical charge flows

30
Q

Current

A

Measurement of the rate of the flow of electrical charge in a circuit. Measured in amperes (A) with an ammeter

31
Q

Potential Difference

A

Measure of the electrical potential energy between two points in a circuit. Measured in volts (V) using voltmeter

32
Q

Voltage

A

Measure of electrical energy push

33
Q

Series Circuit

A

Has all the components connected sequently in a loop

34
Q

Parallel circuit

A

A branched circuit

35
Q

Break in a series circuit

A

Will cause the whole circuit to stop working

36
Q

Break in a parallel circuit

A

Will only stop that particular branch from working if there is an alternative path the electricity flows through it

37
Q

What is electricity

A

A flow of electrons

38
Q

What does V stand for

A

Voltage

39
Q

What does I stand for

A

Current

40
Q

What does R stand for

A

Resistance

41
Q

V=

A

IR

42
Q

I=

A

V/R

43
Q

R=

A

V/I

Science Year 9 (3 decks)

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