Edexcel Physics Unit 1

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  • Created by: natasha
  • Created on: 06-03-13 09:44
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1 ­ Motion
Describing motion
A distance-time graph can make it easier to represent motion
A velocity (speed in a given direction) ­ time graph can show the instantaneous speed
Shows distance from start Gradient shows acceleration
Curved line is acceleration Straight line is constant speed
Straight line means its stopped moving Velocity means its stopped
Gradient represents the speed at that Area under the graph is the distance
point travelled
Gradient = change in Y
Change in X
Distance and displacement
DISTANCE ­ the length of the path you have taken
DISPLACEMENT ­ the straight line distance between two places
To describe displacement, you need to say how far you are away from the start and
Scalar ­ only size or magnitude
Vector quantity ­ size and direction

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Acceleration is the rate of change of velocity with time, so it is also a vector.…read more

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Non-linear graphs (curved graphs) ­ make strips/rectangles under the graph, calculate the
area and add it up this is less accurate than a linear graph
Equations of motion
s = displacement (m)
u = initial velocity (ms-1)
v = final velocity (ms-1)
a = acceleration (ms-2)
t = time (s)
Using vectors
Vectors ­ the length of the arrow represents MAGNITUDE and the direction of the arrow
represents the DIRECTION of the vector
You can either MEASURE the displacement
(labelled the resultant) or use…read more

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Eg. If someone is running along a moving walkway with a velocity of 2 ms -1 relative to the
walkway, but if the walkway has a velocity of -2 ms-1, the person will remain in the same
positive relative to the ground.
1.2 ­ Forces
Causes of motion
Galileo did the pendulum experiment and found that it rose nearly the same height each
time.…read more

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A diagram which shows all the forces acting on a body in a certain situation is
called a FREE BODY DIAGRAM . This doesn't show forces acting on objects other than
the one being considered.…read more

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Newton's second law of motion
In an experiment, the acceleration can be measured for various values of the resultant
force acting on the trolley while its mass is kept constant. On a graph of acceleration
against resultant force, a straight line will show that ACCELERATION IS
There is a DIRECT RELATIONSHIP between F and a (a is proportional to F) i.e.…read more

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F/m g is Nkg-1
W = mg
Electrical scale ­ a piece of conducting metal is compressed or deformed by an objects
weight, changing its electrical resistance.…read more

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The bunting and rope pull on the pole as a
result of being pulled tight. The bunting
pulls horizontally to the left while the
bracing rope pulls down and to the right.
When you resolve the forces and work out
what components are acting vertically and
what are acting horizontally, you can see
the effects of the bunting. It pulls the pole
sideways and downwards. This is a STATIC EQUILIBRIUM
As the pole is at REST it fulfils Newton's first law.…read more

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­Fluid flow
Fluid ­ a substance that can flow ­ normally a gas or liquid, but some solids can sometimes
behave like this
Fluid density is also
mass per unit volume
When an object is SUBMERGED in fluid, it feels an upward force caused by the fluid
pressure ­ UPTHRUST
The size of the force is equal to the weight of the fluid that has been displaced by the
object.…read more




Aaliyah Williams

Your notes are so great! Thank you so much for sharing :) 

Damilola Fasoyiro

These notes are great and easy to understand. Thank you very much.


These notes are so helpful, thank you so much! Could you upload your notes for unit 2 please :)


Unable to download !! Please reupload. 

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