Physics P4 and P5 OCR 21st century

Many people have requested P4, P5 and P6 notes howerever I am unable to find the completed version! In the meantime I have this version which is half completed of P4 and P5. I hope this is useful and if I find my completed notes I will deffinetly upload them 

Thank you and Good Luck to everyone in their exams!!

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  • Created by: Mona
  • Created on: 11-06-16 12:31
Preview of Physics P4 and P5 OCR 21st century

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Page 2

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It is possible to calculate a speed from the gradient of a straight section of a distancetime graph.
This is done by picking any point on the gradient and read off the distance travelled at the is point
and the time taken to get there then use the formula:
Distance travelled (m)
Speed ( m
s) = Time taken (s)
Rise = Distance
Run = Time
A speedtime graph tells us how the speed of an object changes over time.…read more

Page 3

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A velocitytime graph shows how the velocity at which an object is moving changes with time.
Velocity has a direction, so if moving in a straight line in one direction is a positive velocity, then
moving away in a straight line in the opposite direction will be a negative velocity.…read more

Page 4

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A book on a table has a downwards force (its weight) due to gravity ­ this downward force,
pushing on the table produces an upwards force called reaction .
The weight and the reaction of the surface are the same size, and in opposite directions.
However they are NOT an interaction pair, because the weight of the book is caused by the Earth's
gravity not by the table.…read more

Page 5

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The greater the mass of an object or the greater its velocity the more momentum the object it
has.
The change in momentum depends on the force.…read more

Page 6

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P4.4 How can we describe motion in terms of energy changes?
When a force moves an object, it does work and energy is transferred to the object ­ whenever
something moves, something else is providing some sort of effort to move it.…read more

Page 7

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Electrons are negatively charged ­ the material receiving the electrons becomes negatively
charged and the one giving up electrons becomes positively charged .
When two charged materials are bought together, they
exert a force on each other so they are attracted or
repelled.
Two materials with the same type of charge repel each
other ­ two materials with different charges attract each
other.…read more

Page 8

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P ower (watts, W ) = V oltage (volts, V ) × Current (amperes, A)
When an electric current flows through a component (resistor) it causes the component to heat
up. As the current flows, the moving charges collide with the vibrating ions in the wire giving them
energy ­ this increase in energy causes the component to become hot.
In a filament lamp this heating effect is large enough to make the filament in the lamp glow.…read more

Page 9

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The current through a component is proportional to the voltage across it when the resistance
stays constant.
P5.3 How do parallel and series circuits work?
The potential difference (voltage) across a component in a circuit is measured in volts (V) using a
voltmeter connected in a parallel across the component ­ a voltmeter can be used to measure the
potential difference between any two chosen points.…read more

Comments

jjxrocks

Have you got P6, by any chance?

WolfieK

Yes, when will you be uploading P6? P4 and P5 are fantastic, but I need the last too...

Putpkar03

will you be uploading p6 and 7 as well? 

ShabatShalomaTom

This P6 everyone keeps banging on about is true, this stuff is dank, but what would really get my spidey senses tingling is definitely that P6 innit.

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