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y5 Physics > y4 Definitions > Flashcards

y4 Definitions Flashcards

1
Q

Velocity formula (waves)

A

V=f x wavelength

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2
Q

Frequency formula

A

F=1/T

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3
Q

Pressure formula

A

P=F/a

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4
Q

Boyles Law

A

P1V1=P2V2

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5
Q

Speed

A

Distance travelled per unit time

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6
Q

Velocity

A

Rate of change of displacement

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7
Q

Acceleration

A

Rate of change of velocity

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8
Q

Newtons first law

A

All objects will remain in a state of rest or uniform motion in a straight line unless acted upon by a resultant force

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9
Q

Newtons second law

A

When a resultant force acts upon an object of constant mass, the onject will accelerate in the direction of the resultant force. The productof mass and acceleration if the object gives the resultant force

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10
Q

Newtons third law

A

When object A exerts a force on object B, object B will exert an equal amd opposite force on object A

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11
Q

Acceleration due to gravity

A

Constant rate of change of velocity and the value is 10m/s2

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12
Q

Mass

A

Amount of matter in a body

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13
Q

Weight

A

Gravitational force acting on an object

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14
Q

Inertia

A

The reluctance of a body to change its state of rest or motion due to its mass

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15
Q

Gravitational field

A

Region in which a mass experiences a force due to gravitational attraction

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16
Q

Gravitational field strength

A

Gravitational force acting per unit mass

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17
Q

Wave motion

A

A periodic motion which transfers energy from one place to another without any transfer of matter

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18
Q

Transverse waves

A

A wave that travels in a direction perpendicular to the direction of the vibration of particles

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19
Q

Longitudinal waves

A

A wave that travels in a direction parallel to the direction of the vibration of the particles

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20
Q

Wavefront

A

An imaginary line on a wave that joins all the points which have the same phase of vibration

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21
Q

Frequency

A

The number of complete waves produced per second

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22
Q

Wavelegnth

A

The distance between 2 consecutive crests or troughs
SI Unit: m

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23
Q

Period

A

Time taken to produce one complete wave

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24
Q

Amplitude

A

Maximum displacement from rest position
SI Unit: m

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25
Q

Pressure

A

Force acting normally per unit area

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26
Q

Brownian motion

A

The constant and random motion of heavier suspended particles caused by the uneven collisions of surrounding lighter, fast moving particles in the fluid, causing the heavier particles to move in the direction of the resultant force

27
Q

Heat capacity

A

The amount of thermal energy required to change the temperature of an substance by 1C or 1K

28
Q

Specific heat capacity

A

The amount of thermal energy required to change the temperature of 1 kg of substance by 1C or 1K

29
Q

Latent heat

A

The amount of thermal energy required to change the state of a substance without a change in temperature

30
Q

Latent heat of vaporisation (specific)

A

The amount of thermal energy required to change the state of (1kg) of substance from liquid to gaseous or vice versa without a change in temperature

31
Q

Latent heat of fusion (specific)

A

The amount of thermal energy required to change (1kg) of a substance from solid state to liquid state or vice versa without a change in temperature

32
Q

Law of electrostatic

A

Unlke charges attract and like charges repel

33
Q

Pressure

A

Force acting normally per unit area

34
Q

Pascals Principle (liquids)

A

Pressure exerted anywhere in a confined liquid is transmitted undiminished in all directions throughout the liquid

35
Q

Atmospheric pressure

A

Pressure exerted by the weight of the atmosphere or the pressure at any location on earth caused by the weight of the column of air above it

760mm Hg

36
Q

Velocity
Speed

A

Rate of change of displacement/distance

37
Q

Acceleration

A

Rate of change of velocity

38
Q

Phase

A

any 2 points moving in the same direction and have the same speed and the same displacement from the equilibrium position (any 2 crests or troughs are always in phase)

39
Q

Compressions
Rarefaction

A

regions where the medium’s density is higher than the surrounding density
regions where the medium’s density is lower than the surrounding density

40
Q

Speed (waves)

A

distance moved by a wave in one second.

41
Q

Temperature

A

Measure of the average kinetic energy of the particles that make up a body

42
Q

Heat

A

Measure of how much thermal energy is transferred from one body to another

43
Q

Phase change

A

change in state of matter without change in temperature

44
Q

Static electricity

A

imbalance of electric charges within or on the surface of a material or between materials

45
Q

law of electrostatic

A

like charges repel and unlike charges attract

46
Q

triboelectric series

A

gnwspcwmpp
+ glass nylon wool silk paper cotton wood metal polyester polythylene -

47
Q

Electric field line

A

path a positive charge would take in an electric field

48
Q

Current

A

rate of flow of electric charge through a given cross section of a conductor

49
Q

emf

A

across battery
work done by the source in driving a unit charge around a complete circuit

50
Q

pd

A

across component
pd of a component in an electric circuit is the work done to drive a unit charge through the component

51
Q

resistance

A

resistance of a component is a ratio of the pd across the component to the current flowing through the component

52
Q

Ohms Law

A

current passing through a metallic conductor is directly proportional to the pd across it, provided that physical conditions remain constant

53
Q

Power

A

rate of dissipation of energy

54
Q

kWh

A

1 kWh is the amount of electrical energy used by a 1kW appliance in 1 hour

55
Q

magnetic field

A

region surrounding a magnet, in which a body of magnetic material experiences a magnetic force

56
Q

law of emi

A

phenomenon of inducing an emf in a circuit by changing the magnetic field

57
Q

faradays law

A

magnitude of induced emf in a circuit is directly proportional to the rate of change in magnetic flux in a circuit

58
Q

lenz law

A

the direction of induced emf is always such that the magnetic effect opposes the motion or change producing it

59
Q

conservation of energy law

A

energy can neither be created or destroyed but it can be changed from one form to another or transferred from one body to another

60
Q

centre of gravity

A

point through which the weight of a body acts for any orientation of the body

61
Q

principles of moments

A

sum of clockwise moments about a point = sum of anticlockwise moments about a point

62
Q

moment/torque

A

turning effect of a force about a pivot is the product of the force and the perpendicular distance from the pivot to the line of action of the force

63
Q

force

A

a push or a pulla acting on an object due to its interaction with another object

y5 Physics (5 decks)

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