# 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!

- Created by: Aparna
- Created on: 29-05-12 21:17

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.

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