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GCSE Physics > P4 - explaining motion > Flashcards

P4 - explaining motion Flashcards

1
Q

What is a contact force

A

A force where the two objects need to be touching, e.g pushing a chain

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2
Q

What are non contact forces

A

A force where the two objects do not need to touch, e.g the sun gravitational pull

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3
Q

What is the measure for mass

A

Kg

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4
Q

What direction is weight

A

Towards the centre of mass

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5
Q

What is the formula for weight

A

Weight = mass * gravitational field strength

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6
Q

What is the GFS on earth (for the sake of GCSE)

A

10 N/Kg

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7
Q

Is displacement scalar or vector

A

vector

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8
Q

How do u convert km/h to m/s

A

divide km/h by 3.6

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9
Q

formula for acceleration

A

acceleration = (change in speed)/time

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10
Q

equation for constant acceleration

A

v^2 = u^2 + 2as

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11
Q

what is v

A

final speed

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12
Q

what is u

A

start speed

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13
Q

what is s

A

distance

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14
Q

On a distance time graph, what does the gradient show

A

the average speed of the object

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15
Q

On a velocity time graph, what does the gradient show

A

acceleration

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16
Q

what does a flat line on a velocity time graph show

A

constant speed

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17
Q

What does the area under the line on a velocity time graph show

A

distance travelled

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18
Q

What must you always add to a resultant force

A

direction EVEN if at an angle, calculate the agnle

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19
Q

What is centripetal force

A

The force that stops the object flying away

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20
Q

What causes the centripetal force in a ball being spun on a rope

A

the tension in the rope

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21
Q

What causes the centripetal force in a moon orbiting the earth

A

The gravitational force from the earth

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22
Q

Equation for momentum

A

momentum = mass x velocity

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23
Q

What causes the centripetal force in a wooden block on a spinning table

A

The friction of the block

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24
Q

Formula for change in momentum

A

Change in momentum (kg m/s) = resultant force x time for which it acts

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25
Q

what is the conservation of momentum

A

momentum before = momentum afterwards

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26
Q

Which gear move faster, the small or the big one

A

The small one

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27
Q

What is stopping distance?

A

Thinking distance + braking distance

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28
Q

Formula for work done e.g pushing a wheelchair up a hill

A

Work = force x distance

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29
Q

Formula for KE

A

KE = 1/2 x m x v^2

30
Q

Formula for power (mechanical)

A

energy transferred / time

31
Q

how much is one joule (in work done)

A

one newton metre

32
Q

what is the typical speed of a plane

A

900 km/h

33
Q

Formula for GDP

A

mass x GFS x height

34
Q

Is acceleration scalar or vector

A

vector

35
Q

What is the equation for resultant force

A

F = ma

35
Q

units for work done

A

Joules

36
Q

Formula for power

A

Power = work done/ time

37
Q

What is power measured in

A

Watts

38
Q

Formula for change in momentum

A

Change in momentum = force x time

39
Q

Euqation for momentum linking mass and velocity

A

Mass x velocity

40
Q

Formula for force

A

change in momentum / time

41
Q

What is the unit for momentum

A

kgm/s

42
Q

What is the law for conservation of energy

A

Cannot be created or destroyed, only transferred

43
Q

What are the 8 energy stores

A

MAGNETIC
ELECTROSTATIC
ELASTIC
gravitational potential
nuclear
kinetic
thermal
chemical

44
Q

What is a system in physics

A

A collection of matter, when concerned with their energy levels

45
Q

What is a open system

A

A system where energy can be transferred to the outside environment

46
Q

What is a closed system

A

A system where neither matter or energy can enter or exit

47
Q

formula for kinetic energy

A

1/2 mv^2

48
Q

Formula for work done

A

Work done = Force x Distance
W = fd

49
Q

What is the measure of power

A

Watts

50
Q

What is the measure of energy

A

Joules

51
Q

What is the measure of work done

A

Joules

52
Q

Formula for power

A

Power = Energy (transferred) / time
P=E/t

53
Q

x10^3

A

Kilo

54
Q

x10^6

A

Mega

55
Q

x10^9

A

Giga

56
Q

x10^12

A

Tera

57
Q

Tera

A

x10^12

58
Q

Giga

A

x10^9

59
Q

Mega

A

x10^6

60
Q

Kilo

A

x10^3

61
Q

10^-3

A

milli

62
Q

10^-6

A

micro

63
Q

10^9

A

nano

64
Q

10^-12

A

pico

65
Q

milli

A

10^-3

66
Q

micro

A

10^-6

67
Q

nano

A

10^9

68
Q

pico

A

10^-12

69
Q

What 3 things are needed for an interaction pair

A

Must be two different objects
Must be the same type of force
Forces must be equal and opposite

70
Q

Is momentum scalar or vector

A

Vector

GCSE Physics (8 decks)

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