These are some of my additional physics notes, basically from bitesize but just put all together into a printout. I dont think we need to know equations for AQA cause they give them you, but i swear ive done practise papers and they dont put it on. Hope its helpful :)

HideShow resource information
• Created by: Holly
• Created on: 09-06-09 13:16

First 93 words of the document:

Physics
Forces & Motion
Representing Motion
Distance = speed x time
Dinosaurs Sing Terribly
The slope on a
distancetime graph
represents the speed of an
object.
In a distancetime graph,
when the line is horizontal
the object is stationary.
The velocity of an object is
its speed in a particular direction.
The slope on a velocitytime graph represents the acceleration of an object.
The distance travelled is
equal to the area under a
velocitytime graph.

## Other pages in this set

### Page 2

Here's a taster:

Veronica Ate Tea
To work out distance travelled from the graph above you need to find the area of

### Page 3

Here's a taster:

Acceleration depends on :
the force applied to an object
the object's mass
Doubling the size of the resultant force doubles the acceleration.
Objects with a smaller mass will accelerate more. Doubling the mass of an
object halves the acceleration.
Resultant Force (N) = Mass (kg) x Acceleration (m/s2)
RachelFraser Munches Apples
Forces acting on an object:
1. Air resistance (drag)
Air resistance acts in the opposite direction to the motion. Air resistance
depends on the shape of the object and its speed.

### Page 4

Here's a taster:

On the moon there is no air resistance, so if a hammer and a feather are both
dropped at the same time they will reach the ground at the same time. They will
have the same acceleration.
The stopping distance of a car depends on:
thinking distance
braking distance
The faster a car is moving, the greater the thinking distance will be.…read more

### Page 5

Here's a taster:

Velocity = momentum/mass
30/1.5 = 20m/s
Safety
In a car crash the passengers experience great forces because of the change in
momentum, which can cause injury. If the time taken for the change of momentum
on the body is increased, the forces on the body are reduced too. Seat belts and
crumple zones are designed to reduce the forces on the body.
Seat belts are designed to stretch in a collision.…read more

### Page 6

Here's a taster:

The smoke picks up a negative charge when it passes through the negatively
charged metal grid. They are then attracted to the positively charged collecting
plates. They are knocked to remove smoke particles.
Photocopiers
The image of the document is projected onto a positively charged copying plate.
Where light falls onto the plate, the electrical charge leaks away.
Negatively charged black toner particles are attracted to the remaining positive

### Page 7

Here's a taster:

The voltage of each component added together is equal to the voltage across
the cell.
Parallel Circuits
The current is shared across each branch.
The voltage across the cell is equal to the voltage across each branch.
Resistance and Resistors
Electrons collide with atoms more often in a long wire than they do in a short one.
A thin wire has fewer electrons to carry the current than a thick wire.…read more

### Page 8

Here's a taster:

Mains Electricity
Mains Plug
The inner wires are colour coded:
The Neutral wire is blue. This is on the left.
The Earth wire is yellow and green. This is in the middle.
The Live wire is brown. This is on the right.
The three pins are made from brass because it is a good electrical conductor.
There is a fuse between the live terminal and the live pin. The fuse breaks the
circuit if too much current flows.…read more

### Page 9

Here's a taster:

The circuit breaker does the same job as the fuse, but works in a different way.
A springloaded push switch is held in the closed position by a springloaded
soft iron bolt. An electromagnet is arranged so that it can pull the bolt away from
the switch. If the current increases beyond a set limit, the electromagnet pulls the
bolt towards itself, which releases the push switch into the open position.…read more