AQA Physics Unit 2

This is all thanks to Rosanna Weatherly because she's the one who uploaded them. But since they were in OneNote, I decided to make a Microsoft version accessible to more people. I've changes the boxes and layout into bullet points etc. 

I noticed a few minor mistakes that I have corrected and tried to use more accurate terminology in some parts but overall, it was brilliant! Great revision source and very concise and just great! If there are any more mistakes, please let me know. Otherwise, enjoy! 

HideShow resource information
  • Created by: Aparna
  • Created on: 29-05-12 21:17
Preview of AQA Physics Unit 2

First 273 words of the document:

Physics Unit 2
Distance - Time Graphs
Gradient = speed
The steeper the line, the faster it's going
Flat sections = stopped
Downhill = towards start point
Curves = Acceleration/deceleration
Steepening = Speeding up
Levelling off = Slowing down.
Speed, acceleration and velocity
Speed and velocity are measured in m/s
Speed is how fast you're going
Velocity is speed in a certain direction
You could be going at the same speed in
different directions, and that would be no change in speed but a change in velocity.
SPEED = DISTANCE/TIME.
Acceleration is measured in m/s2
Acceleration is how quickly the velocity is
changing.
ACCELERATION = CHANGE IN VELOCITY/TIME
Gradient = vertical/horizontal (use scales of axis)
Velocity - Time Graphs.
Gradient = acceleration
Flat sections = steady speed
The steeper the line, the greater the acceleration
or deceleration
Uphill / = Acceleration
Downhill \ = deceleration
The area underneath the line on the graph is equal to the distance travelled.
A curve = changing acceleration
Mass, Weight & Gravity
GRAVITY IS THE FORCE OF ATTRACTION BETWEEN ALL MASSES.
On the surface of a planet, gravity makes everything accelerate to the ground with the same
acceleration. Gravity gives everything a weight. Gravity keeps moons, satellites and planets
in orbit.
THE ORBIT IS A BALANCE BETWEEN THE FORWARD MOTION OF THE OBJECT AND FORCE OF GRAVITY
PULLING IT IN.
WEIGHT AND MASS AREN'T THE SAME.
Mass is the amount of matter in an object.

Other pages in this set

Page 2

Preview of page 2

Here's a taster:

Weight is caused by the pull of gravity. Weight is measured in Newtons. (N). It's a force.
Weight = mass (kg) x gravitational field strength (N)
An object has the same mass wherever it is, but a different weight depending on the gravity.
The 3 Laws of Motion
1. BALANCED FORCES MEAN NO CHANGE IN VELOCITY.
If the forces acting on an object are balances it will stay still, or if it's already moving it will
stay at the same speed.…read more

Page 3

Preview of page 3

Here's a taster:

Terminal Velocity
When cars/freefalling objects set off, they have more accelerating force than resistance.
As the speed increases, the resistance builds up. This gradually reduces the acceleration until
the resistance = accelerating force, forces are balances, which is terminal velocity.
The resultant force = 0.
An object's terminal velocity depends on their shape and size.
Everything would fall at the same rate, if not for air resistance.…read more

Page 4

Preview of page 4

Here's a taster:

It has a frequency of 50Hz
On a CRO tracer the VERTICAL height of the trace shows input voltage
To calculate the FREQUENCY (Hz) you do 1/Time (s)
A Plug
Neutral Wire = Blue.
Live Wire = Brown
Earth Wire = Green and Yellow.
Static Electricity
A build up of static is caused by friction. It occurs when electrons are brushed on or off of an
object to create a charge. Only the electrons move.…read more

Page 5

Preview of page 5

Here's a taster:

Voltage is the same everywhere. V1 = V2 = V3
Current is shared between branches. Total current = Total of all the currents of separate
branches. A1 + A2 + A3 = A.
Total resistance = less than the branch with the smallest resistance.
1/R1 + 1/R2 +1/ R3 + 1/tR = R. tR means Resistance before the branches emerge/current splits.
Power
Energy = Power/Time.
Eg: A light bulb is on for 2 minutes.…read more

Page 6

Preview of page 6

Here's a taster:

Releases a lot of heat. It gives more energy than chemical bonds do.
Happens in reaction chambers.
Usually Uranium 235 or Plutonium 239 are used.
There is a chain reaction, where neutrons are absorbed by large nuclei which cause it to split
to produce daughter nuclei, and more neutrons that can be absorbed, which keeps the chain
going.
Nuclear Fusion
The joining of small nuclei.
Two light nuclei e.g. hydrogen nuclei combine to create a larger nucleus.
This releases a lot of energy.…read more

Comments

No comments have yet been made

Similar Physics resources:

See all Physics resources »See all resources »