# Physic Essay

1995 words - 8 pages

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Physics Equation List :Form 4 Introduction to Physics
Relative Deviation
Mean DeviationRelative Deviation = 100%Mean Value × Prefixes
Prefixes Value Standard form Symbol
Tera 1 000 000 000 000 1012 T Giga 1 000 000 000 109 G Mega 1 000 000 106 M Kilo 1 000 103 k deci 0.1 10-1 d centi 0.01 10-2 c milli 0.001 10-3 m micro 0.000 001 10-6 μ nano 0.000 000 001 10-9 n pico 0.000 000 000 001 10-12 p
Units for Area and Volume
1 m = 102 cm (100 cm)
1 m2 = 104 cm2 (10,000 cm2)
1 m3 = 106 cm3 (1,000,000 cm3)
1 cm = 10-2 m ( 1
100 m )
1 cm2 = 10-4 m2 ( 2 1
10,000 m )
1 cm3 = 10-6 m3 ( 3 1
1,000,000 m )

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Force and Motion Average Speed
Total DistanceAverage Speed Total Time= Velocity
sv t= v = velocity (ms-1) s = displacement (m) t = time (s)
Acceleration
v ua t −=
a = acceleration (ms-2) v = final velocity (ms-1) u = initial velocity (ms-1) t =time for the velocity change (s)
Equation of Linear Motion
Linear Motion
Motion with constant velocity
Motion with constant
acceleration
Motion with changing
acceleration
sv t
= atuv += tvus )(
2 1 +=
2
2 1 atuts +=
asuv 222 +=
Syllabus)
u = initial velocity (ms-1) v = final velocity (ms-1) a = acceleration (ms-2) s = displacement (m) t = time (s)

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Ticker Tape Finding Velocity:
velocity number of ticks 0.02s
s= ×
1 tick = 0.02s Finding Acceleration:
v ua t −=
a = acceleration (ms-2) v = final velocity (ms-1) u = initial velocity (ms-1) t = time for the velocity change (s)
Graph of Motion Gradient of a Graph
The gradient 'm' of a line segment between two points and is defined as follows:
Change in y coordinate, Gradient, Change in x coordinate,
ym x
or ym x
Δ= Δ
Δ= Δ

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Displacement-Time Graph Velocity-Time Graph
Area in between the graph and x-axis = Displacement
Momentum p m v= × p = momentum (kg ms-1) m = mass (kg)
v = velocity (ms-1)
Principle of Conservation of Momentum
1 1 2 2 1 1 2 2m u m u m v m v+ = +
m1 = mass of object 1 (kg) m2 = mass of object 2 (kg) u1 = initial velocity of object 1 (ms-1) u2 = initial velocity of object 2 (ms-1) v1 = final velocity of object 1 (ms-1) v2 = final velocity of object 2 (ms-1)
Newton's Law of Motion Newton's First Law In the absence of external forces, an object at rest remains at rest and an object in motion continues in motion with a constant velocity (that is, with a constant speed in a straight line).

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Newton's Second Law
mv muF t
α −
F ma=
The rate of change of momentum of a body is directly proportional to the resultant force acting on the body and is in the same direction.
F = Net Force (N or kgms-2) m = mass (kg) a = acceleration (ms-2)...

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