AS Physics Unit 2: Mechanics Notes

These are not my notes i just put them in document form, they're from this website ->http://physicsnet.co.uk/

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  • Created on: 26-04-14 13:48
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Conservation of Energy
Ep= change in gravitational potential energy in joules (J)
m = mass in kilograms (kg)
g = gravitational field strength in newtons per kilogram ( N kg-1)
h = change in height in metres (m)
Ek = kinetic energy in joules (J)
m = mass in kilograms (kg)
v = velocity in metres per second (ms-1)
Work, Energy & Power
W = work done in joules (J)
F = force in newtons (N)
s = displacement in metres (m)
= angle between the direction of motion of the object and the direction of the force in degrees (o)

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P = power in watts (W)
W = work done in joules (J)
t = time in seconds (s)
Newton's Laws of Motion
1) Newton's first law
An object continues in a state of rest or uniform motion in a straight line unless acted on by a resultant force.
2) Newton's second law
The rate of change of momentum of an object is directly proportional to the resultant force applied and is in the direction of the resultant force.…read more

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Newton's third law
When two objects interact they exert equal and opposite forces on each other.…read more

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Motion along a straight line
In the equations below;
v = velocity in metres per second (ms-1)
s = change in displacement in metres (m)
t = change in time in seconds (s)
a = acceleration in metres per second per second (ms-2)
In the equations below;
v = final velocity in metres per second (ms-1)
u = initial velocity in metres per second (ms-1)
a = acceleration in metres per second per second (ms-2)
t = time in seconds (s)
s = displacement in…read more

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Centre of Mass
The centre of mass of an object is the point at which all the mass of the object seems to act. In a uniform gravitational field this is the same point as the centre of
gravity of the object which is where all the weight of the object seems to act.…read more

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Moments
The moment (or torque) of a force about a turning point is the force multiplied by the perpendicular distance to the force from the turning point.
Moments are measured in newton metres (Nm).
Moment = F d
F = the force in newtons (N)
d = perpendicular distance in metres (m)
Example; A 10N force acts at a perpendicular distance of 0.50m from the turning point. What is the moment of the force?
Moment = Fd
= 10 x 0.50
= 5.…read more

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F1 x d1 = F2 x d2
OR
sum of anticlockwise moments = sum clockwise moments
F1 x d1 = (F2 x d2) + (F3 x d3)
Couples
A couple is two equal forces which act in opposite directs on an object but not through the same point so they produce a turning effect.
The moment (or torque) of a couple is calculated by multiplying the size of one of the force (F) by the perpendicular distance between the two forces (s).
E.g.…read more

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Scalars & Vectors
A scalar has only a magnitude (size) whereas a vector has both a magnitude and a direction.…read more

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Two forces of 41N and 60N act at 90o to each other.
STEP 1 ­ calculate the resultant force R
STEP 2 ­ calculate the angle
Resolving Vectors
We can resolve a vector into two components at 90o to each other.
For example we may wish to resolve a velocity of 110 ms-1 acting at an angle of 33o to the horizontal into its horizontal and vertical components.…read more

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Horizontal component (x)
Vertical component (y)…read more

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