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Chemistryyy > Physics > Flashcards

Physics Flashcards

1
Q

Equation for weight

A

W=mg

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2
Q

Equation for force

A

F=Ke

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3
Q

Equation for work done

A

W=Fs

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4
Q

Equation for power

A

P=E/t

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5
Q

Other equation for power

A

P=W/t

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6
Q

Equation for gravitational potential energy

A

Ep = mgh

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7
Q

Equation for Kinetic energy

A

Ek= m(vsquared)/2

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8
Q

Equation for Elastic potential energy

A

Ee= k(e squared)/2

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9
Q

Equation for efficiency

A

efficiency = useful output energy transfer/ total input energy transfer

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10
Q

Other Equation for efficiency

A

Useful power output/ total power input

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11
Q

What is efficiency

A

An indication of how much of the energy supplied to a device is transferred as a useful output

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12
Q

What do electrons have a charge of

A

-1.6 * 10 to the -19 coloumbs

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13
Q

What do protons have a charge of

A

+1.6 * 10 to the -19 coloumbs

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14
Q

What is current determined by

A

The potential difference across the components and the resistance of the components

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15
Q

What is the equation for resistance

A

Resistance = potential difference/ current

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16
Q

What does an ammeter measure

A

How many coulombs of charge pass a point per second - the current

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17
Q

What does a voltmeter measure

A

The difference in energy of two points in a circuit - the potential difference, how much energy a coloumb loses or gains

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18
Q

What does the potential measure?

A

It measures the amount of energy each coloumb of charge has at a particular part in a circuit. We colour code the diagram to show the different energies. How much energy each coloumb of charge has in each part of the cell

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19
Q

Equation for speed

A

S=d/t

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20
Q

Equation for velocity

A

Displacement/ time - v=s/t

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21
Q

Equation for acceleration

A

a= change in velocity/ time

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22
Q

Other Equation for acceleration

A

(v-u)/t

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23
Q

Average walking speed

A

1.5m/s

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24
Q

Average running or jogging speed

A

3m/s

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25
Q

Average Cycling speed

A

6m/s

26
Q

What is a force

A

A push or pull caused by an object interacting with another

27
Q

What are the two non contact forces

A

Electromagnetic and weight

28
Q

What is upthrust

A

Pushing boat etc upwards in water

29
Q

What is normal contact force

A

A force perpendicular to the surface it’s touching

30
Q

What does lift do

A

Lifts plane in air, pushes it up

31
Q

Thrust/ drive what does it do

A

Kelps plane gojng in air , forwards

32
Q

Drag, air resistance what does it do

A

Drags plane backwards, slows it down

33
Q

Tension what is it

A

Being pulled on a string

34
Q

what is the difference between mass and weight?

A

mass is how matter makes up an object, whereas weight is the force of gravity pulling down on an object

35
Q

what is hooke’s law

A

the extension of a spring is directly proportional to the force applied provided the limit of proportionality is not exceeded!!!

36
Q

what is the other euqation of force (hint acceleration)

A

F=ma

37
Q

equation of specific heat capacity

A

E = mc(change in)t

38
Q

euqation of specific latent heat

A

E= ml

39
Q

what two things happen if an object is elastically deformed?

A

when the force is removed it returns to its initial shape and length/size

40
Q

what is it called if an object does not return back to its original shape and length when the force is removed?

A

inelastic deformation

41
Q

what are the 8 energy stores?

A

gravitational, nuclear, kinetic, thermal, elastic, electromagnetic, chemical, vibration

42
Q

what 4 different pathways can energy move between

A

mechanical working, electrical working, heating by particles and heating by radiation

43
Q

what are examples of the 4 energy pathways? xx

A

mechanical - force, electrical -circuit, heating by particles - conduction and convection, heating by radiation - light and infrared

44
Q

what is the definition of work done?

A

a measure of how much energy is trasnferred by mechanical working

45
Q

equation for v squared

A

v squared = u squared + 2as

46
Q

what is the definition of power???

A

the rate at which energy is transferred

47
Q

if an object is dropped from a certain height to the ground what store does the energy go from to to?

A

gravitational potential store —> kinetic store

48
Q

if an object is dropped from a certain height to the ground how woukd you work out the velocity og the coin, given the initial energy from gpe was 9.31J

A

input it into the equation Ek = 1/2 mvsquared, and work out that it is travelling at 86m/s

49
Q

if we ignore ? resistance, the energy of one ? is the same as the one it is ? to

A

air, store, transferred

50
Q

what are the two types of electric charge, and what happens when the two types are very close to each other?

A

positive and negative, and they attract and stick together almost

51
Q

when ? insulators are rubbed together, ? charged electrons move from one ? to the other : eg - a rod and a cloth - the rod gains a positive charge as the negatively charged ? have moved from the ? to the cloth, giving the rod less electrons and therefore more ? so more positively charged protons, so it is ? charged

A

two, negatively, insulator, electrons, rod, protons, positively

52
Q

the ? the potential difference the higher the current, they are ? proportional

A

higher, directly

53
Q

the higher the resistance the lower the ?, they are ? proportional

A

current, indirectly

54
Q

equation of resistance

A

potential difference (v)/ current (A)

55
Q

if an ammeter measured 6A how many coulombs of charge pass a point per second?

A

6 coloumbs of charge per second

56
Q

what is the potential difference?

A

how much energy a coulomb loses or gains, the difference in energy of two points on a circuit

57
Q

if one point has 3J of energy and one has 1.5J - how many volts does each point have and what is the potential difference?

A

they have 3V and 1.5V respectively, and the potential difference is the difference between the two so 3-1.5 so 1.5V

58
Q

having more bulbs in a series circuit ? the current, but in a parallel having more bulbs ? the current since the total ? decreases and it gives the current more ? to and from the cell

A

decreases, increases, resistance, resistance, paths

59
Q

what is resistance?

A

a measure of the opposition to the current flow in an electrical current

60
Q

by adding an extra wire around a bulb in a series circuit the ammeter reading ? so the ? also increased, but the voltmeter reading ? since there’s no ? flowing through the bulb so very ? potential difference

A

increases, current, decreases, current, low

61
Q
A

Chemistryyy (40 decks)

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