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A - Level Maths > Mechanics > Flashcards

Mechanics Flashcards

1
Q

What is a particle

A

Dimensions of the object are negligible

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2
Q

What is a rod

A

All dimension but one are negligible

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3
Q

What is lamina

A

Object with an area but negligible thickness

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4
Q

What is a uniform body

A

Mass distributed evenly

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5
Q

What is a light object

A

Mass of object is small compared to other masses

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6
Q

What is an inextensible string

A

A string that doesn’t stretch under load

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7
Q

What is a wire

A

Rigid thin length of metal

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8
Q

Are all pulleys smooth and light

A

Yes

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9
Q

What is a bead

A

Particle with a whole in it

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10
Q

What is a peg

A

A upport from which a body can be suspended or rested

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11
Q

What is gravity

A

Force of attraction between all objects

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12
Q

What modelling assumptions can you make from a particle

A

Mass of object is concentrated at a single point
Rotational forces and air resistance can be ignored

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13
Q

What modelling assumptions can you make from a rod

A

Mass is concentrated along a line
No thickness
Rigid

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14
Q

What modelling assumptions can you make from a lamina

A

Mass distributed across a flat surface

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15
Q

What modelling assumptions can you make from a uniform body

A

Mass of object concentrated at a single point at the centre of mass

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16
Q

What modelling assumptions can you make from a light object

A

Treat object as having zero mass
Tension the same at both ends of a light string

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17
Q

What modelling assumptions can you make from a inextensible string

A

Acceleration is the same in object connected by a taut inextensible string

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18
Q

What modelling assumptions can you make from a smooth surface

A

Assume there it no friction between the surface and any object on it

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19
Q

What modelling assumptions can you make from a rough surface

A

Object in contact with the surface experience a frictional force if they are moving or are acted in by a force

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20
Q

What modelling assumptions can you make from a wire

A

Treated as one dimensional

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21
Q

What modelling assumptions can you make from a smooth and light pulley

A

No mass
Tension is the same in either side of the pulley

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22
Q

What modelling assumptions can you make from a bead

A

Moves freely along wire or string
Tension is the same on either side of the string

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23
Q

What modelling assumptions can you make from a peg

A

Dimensionless and fixed
Can be rough or smooth

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24
Q

What modelling assumptions can you make from gravity

A

Assume all objects with mass are attracted towards the earth
Earth gravity is uniform + acts vertically downwards

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25
Q

What is friction

A

A force which opposes the motion between two rough surfaces

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26
Q

What is tension

A

If an object is being pulled along by a string

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27
Q

What is thrust / compression

A

Pushed along using a light rod

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28
Q

What is buoyancy

A

Upwards force that allows it to float or rise when submerged in a liquid

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29
Q

What is the SI for mass

A

Kg

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30
Q

What is the Si for displacement

A

m

31
Q

What is the SI fro time

A

S

32
Q

What is the SI for speed / velocity

A

Ms -1

33
Q

What is the Si for acceleration

A

Ms -2

34
Q

What is the SI for weigh / force

A

N
Or
Kgms-2

35
Q

What is scalar

A

Quantity has magnitude only

36
Q

What is a vector

A

A quantity which has both magnitude + direction

37
Q

What is displacement

A

Distance in a particular direction

38
Q

What is velocity

A

Rate of change of displacement

39
Q

What is acceleration

A

Rate of change of velocity

40
Q

What is force / weight

A

Magnitude, direction and point of application

41
Q

In displacement time graphs what does a straight line mean

A

Stationary
There is no change in displacement

42
Q

In a displacement time graph what does a straight diagonal line mean

A

Moving with a constant velocity
Displacement increases at a constant rate

43
Q

In displacement time graphs what does it mean when there is an upward curve

A

Velocity inc. + object acceleration
-displacement inc, at a greater rate

44
Q

What is the normal reaction

A

Force which acts perpendicular to a surface

45
Q

Average velocity equation

A

displacement
= — - - —— ——- —
Time taken

46
Q

Average speed equation

A

Total distance
= ———————-
Time taken

47
Q

In velocity time graphs what does it mean when there is a straight line around v=0

A

Stationary

48
Q

On a velocity time graph what does it mean when there is a straight line

A

Constant velocity

49
Q

On a velocity time graph what does it mean when there is a diagonal upward straight line

A

Constant acceleration

50
Q

What does gradient equal on velocity time graphs

A

Acceleration

51
Q

What does area under graph mean in velocity time graphs

A

Distance

52
Q

What is SUVAT used for

A

Constant acceleration

53
Q

What does the S stand for in SUVAT

A

Displacement

54
Q

What does the U stand for in SUVAT

A

Initial velocity

55
Q

What does the V stand for in SUVAT

A

Final velocity

56
Q

What does the A stand for in SUVAT

A

Acceleration

57
Q

What does the T stand for in SUVAT

A

Time

58
Q

What is weight

A

Due to the particles masss
Force caused by gravity
W= mg

59
Q

What direction does weight always act

A

Downwards

60
Q

What is weight on earth

A

9.8 ms -2

61
Q

What is normal reaction

A

The reaction form a surface
Reaction always acts perpendicular to surface

62
Q

What is tension

A

Force in a taut rope, wire or string

63
Q

What is friction

A

A resistance force due to the roughness between a body and a surface,always acts against motion

64
Q

What is thrust or compression

A

Force ina a rod

65
Q

SI unit of length

A

Meter

66
Q

SI unit of time

A

Seconds

67
Q

SI unit of mass

A

Kg

68
Q

How do you calculate resulting force

A

Add components

69
Q

What resultant force do particles at equilibrium have

A

0

70
Q

How is an object moving if at equilibrium

A

stays still or moves at a constant speed

71
Q

What is Newton’s first law

A

A body will stay at rest or maintain a constant velocity
Unless an extra force acts to change the motion

72
Q

Second newton laws

A

F = mxa

73
Q

Newtons 3rd law

A

For two bodies in contact with each other the force each applies to each other is equal and opposite

74
Q

Make sure you can derive SUVAT equations

A

A - Level Maths (4 decks)

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