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Gcse Post Half Term > Physics > Flashcards

Physics Flashcards

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1
Q

What is a system

A

It is a single object or a group of objects that your interested in

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2
Q

What happens when a system changes

A

It’s energy is transferred. Some energy is dissipated and some stored in less useful ways

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3
Q

How can energy be transferred

A

By heating, by forces doing work and by electrical equipment

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4
Q

What is the equation for work done

A

Work done = force * distance moved

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5
Q

What is the equation for power

A

Power = work done / time taken

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6
Q

What does a free body force diagram show

A

It shows all of the forces acting on an object

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7
Q

What happens when an object is at an equilibrium

A

This means the forces are balanced

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8
Q

What is the equation for the moment of a force

A

Moment of a force = force * distance

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9
Q

What is the equation for charge

A

Charge = current * time

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10
Q

What are all the symbols needed for a circuit

A

Look at page 71 in cgp guide

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11
Q

What is the equation for energy transferred

A

Energy tans ferried = charge moved * volts

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12
Q

What’s the equation for potential difference

A

Voltage = current * resistance

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13
Q

What happens when the temperature increases in a circuit

A

The resistance increased

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14
Q

What does an ldr do

A

It decreases the resistance on a circuit the lighter it gets

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15
Q

What does a thermistor do

A

The resistance decreases as it gets hotter

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16
Q

What happens if you add 2 resistors in a series circuit

A

The resistance is the sum of the resistance of the 2 resistors

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17
Q

What happens if you add resistors to parallel circuits

A

The total resistance becomes less than the smallest resistor

18
Q

What is the equation for energy

A

Energy = time * volts * current

19
Q

What is the equation for power

A

Power = energy transferred/ time

20
Q

What is the equation for electrical power

A

Power = current * potential difference

21
Q

What are the 3 wikres in a cable

A

Neutral wire - it’s blue and completes the circuit

Live wire - it’s brown and carries the voltage

Earth wire - green and yellow and it’s for safety

22
Q

What does earthing and fuses do

A

Prevents electrical overloading

23
Q

How is static electricity created

A

This is when 2 insulating materials are rubbed together, and negatively charged electrons will rub off from one into another.

24
Q

What are uses of static electricity

A

Photocopiers, paint sprayers and insecticides

25
Q

How can static electricity be dangerous

A

Refusing cars - as fuel flows out into the fuel tank static builds up. This can lead to explosions.

On airaplanes

Lightning

26
Q

What happens when a magnetic object goes into the magnetic field of a magnet.

A

It becomes an induced magnet

27
Q

What happens when there is a current in between 2 magnets

A

The fields curve with the field of the current until they meet their destined pole

28
Q

What is the equation of force

A

Force = magnetic flux density * current * length

29
Q

What is a solenoid

A

A long coil of wire

30
Q

How do you know which way a current carrying coil of wire spins in a magnetic field

A

Left hand rule (thumb = direction of force, first finger = field and second finger = current.)

31
Q

What is the magnetic field like through an electrically charged solenoid

A

The field travels all through the coil and then loops back

32
Q

Hat Is electromagnetic induction

A

The induction of a voltage in a wire expecting a change in magnetic field

33
Q

What do transformers do

A

They use induction to change the voltage of an alternating current

34
Q

What does a step up and step down transformer do

A

Step up - increase voltage and could

Step down - decrease voltage and coils

35
Q

What is the equation for transformers

A

Primary voltage * primary current = secondary d.p * secondary I

36
Q

What do Dynamos and alternators do

A

Dynamos creat dc and alternators creat ac

37
Q

Hat Is the equation for voltage to coils

A

Input d.p / output p.d = primary coils / secondary coils

38
Q

What is the equation for change in thermal energy

A

Change in thermal energy = mass * specific heat capacity * temp change

39
Q

What is the temperature of absolute 0

A

0 kelvin, -273°

40
Q

What’s the freezing point of water

A

0°c , 273 kelvin

41
Q

What is the equation for force with springs

A

Force = spring constant * extention

42
Q

Hat Is the equation for fluid pressure

A

Fluid pressure = height * density of liquid * gravity(10)

Gcse Post Half Term (6 decks)

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