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Science Required Practicals and key words > Physics Required practicals > Flashcards

Physics Required practicals Flashcards

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1
Q

INVESTIGATING SPRINGS

What is the equation linking Force, extension and spring constant?

A

INVESTIGATING SPRINGS
F = ke
Force = Spring constant x Extension

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2
Q

INVESTIGATING SPRINGS

What is the equation for elastic potential energy?

A

INVESTIGATING SPRINGS
E = 1/2(ke^2)
Elastic potential energy = 1/2 x spring constant x estension^2.

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3
Q

INVESTIGATING SPRINGS

What is a source of error in this practical?

A

INVESTIGATING SPRINGS

Not measuring extension accurately.

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4
Q

ACCELERATION

What are the 2 equations for acceleration?

A

ACCELERATION

1) a = F/m (F = ma) - tested in this practical
2) a = (V-U)/t = (Change in velocity / time)

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5
Q

ACCELERATION

What are the 3 variables?

A

ACCELERATION
I = Force
D = Acceleration
C = Mass over whole apparatus stays same, trolley

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6
Q

ACCELERATION

What is the method for this practical?

A

ACCELERATION

1) Set up trolley with piece of card with gap to interrupt light gate. Software calculates acceleration.
2) Add masses to hook on string, provides accelerating force (mass of hook x acceleration due to gravity)
3) Repeat this twice with readings

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7
Q

ACCELERATION

What are some sources of error?

A

ACCELERATION

  • Mass off string not put into trolley
  • Friction between trolley, use air instead
  • String loose when released
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8
Q

WAVES: RIPPLE TANK

What is the method for this practical?

A

WAVES: RIPPLE

1) Set up a ripple tank so that it has a set frequency
2) Measure the distance between 10 wave crests and then divide it by ten to get 1 (average) wavelength
3) Do the same for frequency, calculate wave speed

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9
Q

WAVES: RIPPLE TANK

What is a source of error? How can you solve this?

A

WAVES: RIPPLE TANK

Hard to measure the wavelength/frequency. To solve this take a photo of the ripple tank.

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10
Q

WAVES: STRINGS

How can you measure wavelength from a vibrating string?

A

WAVES: STRINGS

With a metre stick, measuring the distance between nodes (or full cycle)

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11
Q

WAVES: STRINGS

How could you make sure that the measurement of wavelength is accurate?

A

WAVES: STRINGS

Use a strobe light to the same frequency to light the oscillations.

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12
Q

WAVES: BOTH

What is the equation common in both waves practicals?

A 
WAVES: BOTH
Wave speed (m/s) = Frequency (Hz) x Wavelength (m)
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13
Q

LIGHT

In what conditions should light experiments be done in?

A

LIGHT

Dark conditions

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14
Q

LIGHT

Where do you measure angles from?

A

LIGHT

Always from the normal for angles of incidence, reflection and refraction.

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15
Q

LIGHT

What is the independent (changing) variable?

A

LIGHT

Material used or angle of incidence

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16
Q

LIGHT

What is the dependent variable?

A

LIGHT

Angles of reflection and refraction

17
Q

LIGHT

How do you know that you have conducted the experiment accurately?

A

LIGHT

The angle of incidence should ALWAYS equal the angle of reflection.

18
Q

LIGHT

How does the density of a material affect the behaviour of light?

A

LIGHT

Usually the denser the material, the slower light travels through it, bending towards the normal.

19
Q

LIGHT

What are some sources of error?

A

LIGHT

  • Moving the block
  • Light from ray box spreading out
20
Q

RADIATION + ABSORPTION

What is the method for this practical?

A

RADIATION + ABSORPTION

1) Put Leslie cube on a heat proof mat
2) Fill with water and leave to warm up
3) Use thermometer to measure temp of each side, all same temp
4) Use an IR detector to record he amount of IR radiation for each side, distance from cube same
5) Find out black sides emit more IR radiation

21
Q

RADIATION + ABSORPTION

What are black bodies?

A

RADIATION + ABSORPTION

Perfect absorbers and emitters of all radiation.

22
Q

RADIATION + ABSORPTION

What needs to be controlled?

A

RADIATION + ABSORPTION

The water temperature inside the cube - same for each reading.

23
Q

RADIATION + ABSORPTION

Why should you take repeat readings?

A

RADIATION + ABSORPTION

To make sure that the results are repeatable.

Science Required Practicals and key words (2 decks)

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