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GCSE CCEA Physics unit 2 And 3 > All Prescribed Practicals > Flashcards

All Prescribed Practicals Flashcards

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1
Q

What is an independent variable?

A

The variable you change during an experiment

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2
Q

What is a dependent variable?

A

The variable which changes depending on the independent variable

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3
Q

What is a control variable?

A

The variable which stays the same during an experiment

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4
Q

Which variable is plotted on the x axis (generally)

A

Independent

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5
Q

Which variable is plotted on the y axis (generally)

A

Dependent

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6
Q

Which variable is plotted on the y axis in investigations of hooke’s law?

What is it’s quantity?

A
  • independent variable
  • Force

(Remember the units in the equation is N = N/m x m)

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7
Q

Which variable is plotted on the x axis in investigations of hooke’s law?

What is it’s quantity?

A
  • dependent variable
  • extension - m

(Remember the units in the equation is N = N/m x m)

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8
Q

What is the equation for Hooke’s law?

A

F=kx

Force = spring constant x extension
N = N/m x m

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9
Q

In the equation y=mx +c, what is the dependent variable shown by? (Generally)

A

Y

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10
Q

In the equation y=mx +c, what is the independent variable shown by? (Generally)

A

X

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11
Q

What is the equation for moments?

What is the rule for moments

A

M = Fd
Moment = Force x perp length

CM = ACM

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12
Q

What is the relation between y and x if c = 0

(y=mx + c)

A

Directly proportional

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13
Q

What is the relation between y and x if c = 1

(y=mx + c)

A

Proportional

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14
Q

What are the properties of direct proportionality?

A
  • straight line
  • through origin
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15
Q

What is the property of proportionality?

A

A straight line

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16
Q

In the equation s = d/t, what is the relationship between speed and time?

A

Inversely proportional

17
Q

How do you demonstrate direct proportionality on a graph when two values are inversely proportional?

A
  • Have y value on the y axis
  • have 1/x on the x axis
18
Q

What shape is a graph of inverse proportionality?

A

A curve from top to bottom

19
Q

Does an inversely proportional graph touch the axes?

A

No

20
Q

What is the definition of moments

A

the product of a force and perpendicular distance from the fulcrum

21
Q

State the principal of moments (2)

A
  • for an object in rotational equilibrium
  • ACM = CM about the same point
22
Q

State Ohm’s law

A

Voltage is directly proportional to current at constant temperature

23
Q

What is a systematic error?

A

An error which cannot be reduced by repeating

24
Q

What is the unit for moments?

A

Nm or Ncm

25
Q

What is the equation for Ohm’s law?

A

V=RI

26
Q

What is the relationship between resistance and length?

What equation represents this?

A
  • resistance is directly proportional to length of the wire
  • R=kl
27
Q

What is the unit for k in R=kl

A

Ohms per meter / ohms per centimetre

28
Q

P1

Average speed depending on height of a ramp

Give apparatus (4) and the method (5) used.

A
  1. Apparatus:
  • a ball bearing
  • runway
  • metre rule
  • stopwatch
  1. Method:
  • measure the length of the slope using a metre rule
  • position the runway with the ball bearing at a vertical distance of 20cm from the desk
  • release the ball bearing and measure the time taken for the ball to travel the length of the slope
  • record results in a table
  • repeat at different heights and calculate average speeds (s=d/t)

(Results should show average speed to be directly proportional to the height)

29
Q

P2

Hooke’s law

Give apparatus (3) and the method (6) used.

A
  1. Apparatus:
  • spring
  • slotted masses
  • a metre rule
  1. Method:
  • measure the original length of the spring
  • add a 100g mass (1N load) to the spring
  • measure the new length of the spring
  • calculate and record the extension
  • increase mass and repeat
  • record all results in a table

(Results should show that extension is proportional to load)

30
Q

P3

Moments (in A)

A
31
Q

P4

Investigate the relationship between the mass and volume of solids and liquids

Give apparatus (3) and the method (9) used.

A

Liquids:

  1. Apparatus:
  • 100cm3 measuring cylinder
  • electronic balance
  • 250cm3 of water
  1. Method:
  • measure the mass of the cylinder using the balance
  • zero the balance
  • pour 20 cm3 of water into the cylinder
  • record its mass and volume in a table
  • do the same with other volumes
  • find density (p=m/v)

For solids:

  • use a cube,
  • using a ruler, measure it’s length breadth and heights to get volume,
  • then get the mass and density
32
Q

P5

Measure power by measuring the time taken to climb stairs

Give apparatus (3) and the method (7) used.

A
  1. Apparatus:
  • bathroom scales
  • a metre rule
  • a stopwatch
  1. Method:
  • measure the mass of the person
  • use w=mg to get weight
  • find the height of one step on the stairs using a metre rule
  • count the number of steps and multiply by the height of a step. This is the height of the stairs
  • use a stopwatch to measure time taken to go up the stairs
  • repeat and get the average time to get up the stairs
  • use w=fd and p=e/t to get power
33
Q

P6

Refraction through a glass block, using angles to plot a graph of incidence against refraction

Give apparatus (6) and the method (8) used.

A
  1. Apparatus:
  • rectangular glass block
  • ray box
  • protractor
  • A4 page
  • pencil
  • ruler
  1. Method:
  • place the block in the centre of the page and draw the outline in pencil
  • draw a normal
  • direct a light ray at the point where the normal strikes the block
  • mark the paths of the incident and refracted rays using dots
  • connect the dots and put a normal on the bottom ray
  • connect the two rays
  • measure the angles of incidence and refraction (protractor), then record in a table
  • repeat at different angles of incidence
34
Q

P7

Ohm’s law

(On A)

A
35
Q

P8

Investigate the relationship between resistance and length

Give variables (3)

A

Variables:

  • Indy: length of wire
  • dep: resistance
  • control: temp and cross sectional area of wire
36
Q

P9

Investigating how magnetic field strength depends on:

  • current in a coil,
  • number of turns in a coil,
  • material of the core
A

Essentially, for each construct an electromagnet and measure the number of iron nails it attracts over the same distance

You need:

  • a variable resistor
  • an ammeter
  • a coil of copper wire
  • a laminated soft iron core
  • for material you need other materials for cores too
  • a power supply

GCSE CCEA Physics unit 2 And 3 (8 decks)

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