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A - Level Maths > Mechanics > Flashcards

Mechanics Flashcards

(74 cards)

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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
What is friction
A force which opposes the motion between two rough surfaces
26
What is tension
If an object is being pulled along by a string
27
What is thrust / compression
Pushed along using a light rod
28
What is buoyancy
Upwards force that allows it to float or rise when submerged in a liquid
29
What is the SI for mass
Kg
30
What is the Si for displacement
m
31
What is the SI fro time
S
32
What is the SI for speed / velocity
Ms -1
33
What is the Si for acceleration
Ms -2
34
What is the SI for weigh / force
N Or Kgms-2
35
What is scalar
Quantity has magnitude only
36
What is a vector
A quantity which has both magnitude + direction
37
What is displacement
Distance in a particular direction
38
What is velocity
Rate of change of displacement
39
What is acceleration
Rate of change of velocity
40
What is force / weight
Magnitude, direction and point of application
41
In displacement time graphs what does a straight line mean
Stationary There is no change in displacement
42
In a displacement time graph what does a straight diagonal line mean
Moving with a constant velocity Displacement increases at a constant rate
43
In displacement time graphs what does it mean when there is an upward curve
Velocity inc. + object acceleration -displacement inc, at a greater rate
44
What is the normal reaction
Force which acts perpendicular to a surface
45
Average velocity equation
displacement = — - - —— ——- — Time taken
46
Average speed equation
Total distance = ———————- Time taken
47
In velocity time graphs what does it mean when there is a straight line around v=0
Stationary
48
On a velocity time graph what does it mean when there is a straight line
Constant velocity
49
On a velocity time graph what does it mean when there is a diagonal upward straight line
Constant acceleration
50
What does gradient equal on velocity time graphs
Acceleration
51
What does area under graph mean in velocity time graphs
Distance
52
What is SUVAT used for
Constant acceleration
53
What does the S stand for in SUVAT
Displacement
54
What does the U stand for in SUVAT
Initial velocity
55
What does the V stand for in SUVAT
Final velocity
56
What does the A stand for in SUVAT
Acceleration
57
What does the T stand for in SUVAT
Time
58
What is weight
Due to the particles masss Force caused by gravity W= mg
59
What direction does weight always act
Downwards
60
What is weight on earth
9.8 ms -2
61
What is normal reaction
The reaction form a surface Reaction always acts perpendicular to surface
62
What is tension
Force in a taut rope, wire or string
63
What is friction
A resistance force due to the roughness between a body and a surface,always acts against motion
64
What is thrust or compression
Force ina a rod
65
SI unit of length
Meter
66
SI unit of time
Seconds
67
SI unit of mass
Kg
68
How do you calculate resulting force
Add components
69
What resultant force do particles at equilibrium have
0
70
How is an object moving if at equilibrium
stays still or moves at a constant speed
71
What is Newton’s first law
A body will stay at rest or maintain a constant velocity Unless an extra force acts to change the motion
72
Second newton laws
F = mxa
73
Newtons 3rd law
For two bodies in contact with each other the force each applies to each other is equal and opposite
74
Make sure you can derive SUVAT equations

A - Level Maths (4 decks)

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