AQA additional science physics revision notes

AQA additional science physics revision notes. i hope this helps and check out my other revision notes for biology and chemistry. XD

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  • Created on: 16-05-12 17:50
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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) = ---------------------------------------------
Time taken (seconds, s)
When comparing on a distance-time graph, the line with the highest end distance travelled
the furthest.
If a line is underneath the highest one, then it travelled slower
If the line is vertical, then it means it stopped and its speed was zero for some time
Summary Questions
Key Points
Q1. A) The unit of speed is the metre/second
1. The steeper the line on a B) An object moving at steady speed travels the -
distance-time graph, the - same distance every second.
greater the speed it C) The steeper the line on a distance-time graph of
represents - a moving object, the greater its speed is.
2. 2. Speed (m/s) =
----distance travelled (m) ------ Q2. A vehicle moves on a motorway travels 1800 m in
---------------------------------------- 60 seconds. Calculate:
---- -----time taken (s) a) The speed of the vehicle in m/s
b) How far it would travel at this speed in 300
seconds

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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.…read more

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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
second)
If the slope is steeper, then it means that the object
accelerated faster than the first time
The slope of the line on a velocity-time graph represents acceleration
Braking:
- Reduces the velocity of…read more

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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 straight line, but curved, then the object is moving with a changing speed.…read more

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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 ­ makes car move
This force is due to friction between the ground
and the tyre of each drive wheel.…read more

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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 object is zero, then the object:
Remains stationary (if it was at rest) of,
Continues to move at the same speed and in the same direction if it was already moving
1.…read more

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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 an object changes, it must be acted on by a resultant force.…read more

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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 velocity of the vehicle when the brakes are first applied and the mass of
the vehicle
Braking force:
Greater the velocity, the greater the deceleration needed to stop it in a certain distance.…read more

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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 it (measured in KILOGRAMS)
Gravitational field strength (unit = N/kg).…read more

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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 an object and increase its GPE by 20J, the work done on the object is 20J)
Work done = force x distance moved in the direction of the force
.…read more

Comments

Conor Murphy

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

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