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P7 ­ NUCLEAR PHYSICS PHYSICS:


Distance-time graphs


the speed was CONSTANT
The car went 10 metres every second ( = 50 metres
5 seconds)
The steeper the slope, the faster it travelled
THE SLOPE ON A DISTANCE-TIME GRAPH
REPRESNENTS ITS SPEED.




Distance travelled (metre, m)
Speed (metres/second, m/s) = ---------------------------------------------…

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P7 ­ NUCLEAR PHYSICS


Velocity and acceleration:
VELOCITY = speed in a given direction

An object moving STEADILY round in a circle has a CONSTANT speed. Its direction of
motion changes so its velocity is not constant.
Two moving objects can have the same speed but different velocities. E.g. a…

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P7 ­ NUCLEAR PHYSICS


More about velocity-time graphs
The graph shows:

The object was accelerating (as the line goes
up because the velocity is increasing with time)
The acceleration was constant or UNIFORM
(as the line is straight, which tells us that the
increase in velocity was the same every…

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P7 ­ NUCLEAR PHYSICS




Using graphs
Distance-time graphs:

Object moving at a constant speed = straight line
The speed is represented in the slope of the line. To find the slope you need the gradient
draw a triangle under the line and use the equation:
If it is not a…

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P7 ­ NUCLEAR PHYSICS


Forces between objects
Two objects push of pull on each other ­ they exert equal and opposite forces on one another

UNIT: NEWTON (N)

E.g. a boxer punches an opponent with a force of 100N experiences a reverse force of 100N from his
opponent


Motive force…

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P7 ­ NUCLEAR PHYSICS


Resultant force
The effect of a force on an object can be worked out by replacing them with a single force, the
RESULTANT FORCE = the single force that has the same effect as all the forces acting on the object

If result force of an…

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P7 ­ NUCLEAR PHYSICS


Forces and acceleration
Results for an investigation about force acceleration, the results can be shown as a velocity-time
graph

Acceleration = gradient of the line




Resultant force = mass x acceleration
(Newtons, N) (Kg) (metres/second 2)


F=ma or a= Fm or m=Fa



If the velocity of…

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P7 ­ NUCLEAR PHYSICS


On the road
Car travelling at a constant velocity = resultant force is zero

Motive force of engine is balanced by the resistive forces on it

A car driver uses the accelerator pedal to vary the motive force of the engine

Braking force ­ depends on…

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P7 ­ NUCLEAR PHYSICS


Falling objects
To reduce your weight: Go to the equator (slightly further from the centre of the earth than the
poles)

Your MASS does NOT change

Weight of an object = force of gravity on it (measured in NEWTONS)
Mass = the quantity of matter in…

Page 10

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P7 ­ NUCLEAR PHYSICS


Energy and work
Work done causes the transfer of energy. When an object is moved by a force, we say that work is
done on the object by the force. The force transfers energy to the object

Work done = energy transferred

(E.G. if you raise…

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Conor Murphy

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Will you be able to post Additional Science Chemistry AQA Notes? Your resources are very helpful!

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