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Slide 1

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Physics 2
Retake Revision…read more

Slide 2

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Velocity and Acceleration
Speed is how fast you're going
Velocity is how fast you're going with
the direction specified.
Speed, Distance and Time Speed, Distance and Time
Distance Change in Velocity
Speed = ------------ Acceleration = ------------
Time Time Taken
Axt…read more

Slide 3

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Distance and Velocity ­ time graphs
Calculating acceleration, speed and
Calculating the speed from a distance
distance time graph is just the 1) Acceleration ­ Gradient
gradient: 2) Speed ­ reading the value of V axis
VERTICLE / HORIZONTAL 3) Distance ­ equal to the area under
the graph.…read more

Slide 4

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Mass, Weight and Gravity
Gravity ­ Force of attraction Weight and Mass ARE NOT THE SAME
between all masses.
Weight Mass
(Only noticeable when one of
the masses is really big) Caused by the pull of Amount of "stuff" in an
gravity ­ force of gravity object
pulling it towards the
centre of the earth
This has 3 IMPORTANT effects: Object will be different on Object has same mass
· On the surface of the planet it earth and moon ­ force of whether its on earth or
gravity is less moon
makes all things Accelerate
Weight is force measured Mass is NOT a force, it is
towards the ground. in newton's (N) measured measure in Kilograms with
· It gives everything a weight with spring balance or a mass balance
· It keeps planets, moons and newton meter.
satellites in their orbits.
the orbit is a balance between Weight = Mass x Gravitational field strength
the forward motion of the object
and the force of gravity pulling it W=mxg
inwards. W
MxG…read more

Slide 5

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Three Laws of Motion
First Law
So long as the forces on an object are all Balanced, then it'll just stay still, or else
if its already moving it'll just carry on at the same velocity ­ so long as the forces
are all balanced.
When a vehicle (any
transport) is moving at
constant velocity then the
forces must be all Balanced
Things don't need a To keep going at a steady speed there must be
constant over all force to zero resultant force
keep them moving ­ NO…read more

Slide 6

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Three Laws of Motion
Second Law
If there is an unbalanced force, then the object will accelerate in that
1) An unbalanced force will always produce
acceleration (or deceleration)
2) This acceleration can take 5 different forms:
· Starting, stopping, speeding up, slowing
down and changing direction.
3) The arrows will be unequal
· the greater the force, the
Any resultant force will produce acceleration greater the acceleration
or deceleration
Anti clock wise moment = Clockwise moment · The bigger the mass, the
smaller the acceleration
· To get a big mass to
accelerate as fast as a
F = ma small mass it needs a
bigger force.…read more

Slide 7

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Slide 8

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Slide 9

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Slide 10

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