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Physics Mock exam > Physics paper one > Flashcards

Physics paper one Flashcards

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1
Q

The centre of mass

A

The point at which all the mass of an object seems to be concentrated.

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2
Q

The stability

A

How easily an object topples over

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3
Q

Hypothesis

A

The higher the centre of mass of an object, the more likely it is to topple over

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4
Q

The higher something is…

A

The less stability it has

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5
Q

Work

A

An object is said to have done work when it transfers (uses) energy

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6
Q

Work done equation

A

Work done=force x distance

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7
Q

What is work done equal to?

A

The work done by an object is equal to the amount of energy that it transfers

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8
Q

Moment

A

The turning effect of a force

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9
Q

Moment equation

A

Moment= Force x perpendicular distance from the line of action of force to the pivot

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10
Q

Levers

A

Used as force multipliers, a force multiplier exerts a greater force to the load that is applied to the lever

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11
Q

Gear

A

Directly connected to the force of the engine

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12
Q

The bigger the wheel,

A

it has twice the radius as a smaller wheel- it therefore has a greater moment

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13
Q

Increase force

A

The second wheel has more teeth than the first one, it turns slower than the first one but with more force

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14
Q

Change direction

A

When two gears mesh together, the second one always turns in the opposite direction.

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15
Q

Elastic potential difference

A

The energy stored when a force is applied to an elastic object causing it to stretch or compress

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16
Q

Force equation

A

spring constant x extension

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17
Q

Diagonal force

A

Means part of this force is acting horizontally and part of this force is acting vertically

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18
Q

Horizontal component=

A

force x cos(angle)

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19
Q

Vertical component

A

Force x sin(angle)

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20
Q

Kinetic energy

A

The energy in moving objects- movement energy

21
Q

Electrical energy

A

Energy in moving charges or static electric charges

22
Q

Heat energy

A

Also called thermal energy

23
Q

Elastic potential

A

stored energy in squashed or stretched objects

24
Q

Light energy

A

Also called radiant energy

25
Q

Nuclear energy

A

Stored in the nuclei of atoms

26
Q

Gravitational potential

A

Energy stored in raised objects

27
Q

Internal energy

A

Contained in a thermodynamic system

28
Q

Chemical energy

A

Stored energy in batteries, food and fuel

29
Q

Strain energy

A

Released when atoms in a molecule rearrange themselves in a chemical reaction

30
Q

Sound energy

A

Energy realised by vibrating objects

31
Q

Efficiency

A

The efficiency of a device is the proportion of the energy supplied that is transferred in useful ways. The efficiency can be calculated as a decimal or a percentage.

32
Q

Efficiency equation

A

useful energy out divided by Total energy in

33
Q

Switch

A

A switch used to turn a circuit on (closed) and off (open).

34
Q

Lamp

A

An electrical current heats the filament in a bulb so that it gives out light.

35
Q

Fixed resistor

A

A resistor restricts or limits the flow of electrical current. A fixed resistor has a resistance that does not change.

36
Q

Variable resistor

A

Moving the position of the slider on this resistor, changes the resistance. A variable resistor is used in some dimmer switches and volume controls.

37
Q

Thermistor

A

A thermistor can be used in thermostats or heat activated fire alarms.

38
Q

LDR

A

A LDR can be used as a sensor in cameras or automatic lights that come on when it gets dark. The resistance of a LDR depends on light intensity. At low light levels, the LDR has a high resistance. As the light intensity increases, the resistance decreases

39
Q

Semiconductor diode

A

A semiconductor diode allows current to flow in one direction only. Current will not flow in the other direction. Diodes are used to convert an alternating current into a direct current.

40
Q

Alternating current

A

An electric current that regular changes its direction and size

41
Q

Direct current

A

The movement of charge through a conductor in one direction only

42
Q

Static electricity

A

All about charges which are not free to move- causes them to build up in one place often needs with a spark

43
Q

Build up of static electricity

A

Caused by friction

44
Q

How is static electricity formed

A

Insulating objects are rubbed together, negatively charged electrons will be scraped off one and dumped on the other, leave a positive static charge and an equal negative on an other

45
Q

Electrostatic charges formed by

A

Only formed by the movement if electrons - positive don’t move!

46
Q

Two electrically charged objects

A

When brought close together they exert a force on one another

47
Q

Opposite electric charges

A

Are attracted to each other

48
Q

Same electric charges

A

Will repel each other

49
Q

Closed systems

A

Systems where matter nor energy can enter or leave

Physics Mock exam (1 decks)

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