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Physics > Yr 9 end of year test > Flashcards

Yr 9 end of year test Flashcards

1
Q

What is wavelength

A

The distance between two points after which the pattern repeats itself

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2
Q

What is amplitude

A

The distance between the undisturbed position(middle) and the peak or crest of the wave.

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3
Q

What is frequency

A

How many waves occur each second

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4
Q

What is period

A

The time it takes for an oscillation(one up and down to occur)

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5
Q

What is a transverse wave?

A

Particles move perpendicular to the energy(up and down)

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6
Q

What is a longitudinal wave

A

Particles move parallel to the direction of the the energy(back and forwards)

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7
Q

What is a mechanical wave?

A

A wave where vibrations travel through a medium(a substance)

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8
Q

What are electromagnetic waves?

A

These are waves that travel through a vacuum, no medium(substance) is needed

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9
Q

List the electro magnetic wavelength from largest wavelength to smallest wavelength

A

Radio waves, microwaves, infra-red, visible light, ultra-violet, x-rays and gamma rays

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10
Q

How are electro magnetic spectrum the same.

A

They all are waves

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11
Q

What is different about electro magnetic waves

A

The wavelength radio waves go from 50cm to gamma rays which have a wavelength of 10 pilometers

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12
Q

Why is the electro magnetic spectrum dangerous

A

They can damage cells

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13
Q

The is the wave speed equation

A

Speed=frequency x wavelength

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14
Q

What is the relationship between frequency and period

A

Frequency =1/period

Period=1/frequency

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15
Q

Which different surfaces absorb and emit infrared radiation more or less effectively

A

Dark and matt materials are good at emitting and absorbing infrared radiation
Light and shiny materials are bad at emitting and absorbing infrared radiation

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16
Q

What is the difference between scalar and vector

A

Scalar quantities just have magnitude(eg temperature or mass) but vector quantities have direction and magnitude (eg friction)

17
Q

What is the equation the ties weight, gravity and mass together?

A

Weight=mass x gravitational field strength

18
Q

What is the difference between weight and mass

A

Weight is dependent on gravity and measure how much gravity is pulling something down and mass is how much stuff is in something

19
Q

What is the units for mass and weight

A

Mass is measured in grams, weight is measured in Newton’s

20
Q

What is the equation for kinetic energy

A

Kinetic energy= 0.5 x mass x speed(squared)

21
Q

What is the equation for gravitational potential energy

A

Gravitational potential energy =

mass x gravitational field strength x height

22
Q

What is the equation for elastic potential energy

A

Elastic potential energy =

0.5 x spring constant x extension(squared)

23
Q

What is the equation for work done

A

Work = force x distance

Physics (4 decks)

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