# AQA Additional Science (Physics) revision

Revision notes on the first section of Additional Physics. All about work, power, distance-time graphs etc...

With help from GCSE Physics -The Revision Guide by CGP and my-gcsescience.com

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• Created by: Sophie
• Created on: 23-05-13 15:06

## Pages in this set

### Page 1

Velocity and Distance Time Graphs
SPEED and VELOCITY are both HOW FAST you are going.

Speed is just how fast
Whereas velocity must have a direction

2. Flat sections are where it's stationary
3. Straight uphill or downhill sections mean
it's travelling…

### Page 2

Acceleration and Velocity-Time Graphs
ACCELERATION is HOW QUICKLY velocity is CHANGING

A change in velocity can be a ­CHANGE IN SPEED
- CHANGE IN DIRECTION

change in velocity
Acceleration, m/s2 = time taken, s

VELOCITY ­ TIME GRAPHS

2. Flat sections represent steady speed…

### Page 3

Weight, Mass and Gravity
GRAVITATIONAL FORCE is the FORCE OF ATTRACTION
between ALL MASSES

Gravity attracts all masses
1. On the surface of a planet, it makes all things accelerate
towards the ground
2. It gives everything a weight

WEIGHT and MASS are NOT THE SAME…

### Page 4

Resultant Forces
RESULATANT FORCE is the OVERALL FORCE on a point or object

1. In most situations there are at least two forces acting on an
object along a direction
2. The overall effect of these forces will decide the motion of
the object
3. If…

### Page 5

Terminal Velocity
An object acted on only by gravity accelerates at about 10m/ s2

If the object falls with no other forces acting on it the resultant force is its
weight. Example: If we release a 1kg object above the ground:
The force of gravity is…

### Page 6

Calculating Work and Power

WORK MEANS ENERGY TRANSFERRED (Joules)
W ork = f orce × distance
W = f ×d
200N × 1.6 = 300J

Calculating Acceleration

Resultant
force

### Page 7

v-u f , N
a, m/s2 = t, s a= m, kg

EXAMPLE:
An engine of a car is 2500N. Calculate the acceleration. Mass of the car is 500
kg.

a=
f , N
m, kg a = 2500 2
500 = 5 m/s

A cheetah…