# Unit 4 Physics

• Created by: Tasha05
• Created on: 13-04-14 16:58
Capacitance volt
The amount of charge stored per volt
1 of 21
Factors affecting capacitance
surface area, insulator type, distance between plates
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Graphs for charging Q, V, I
up, up, down
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Graphs for dischanging Q, V, I
down, down, down
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Energy stored by a capacitor
area under a Q-V graph
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Momentum=
mass(kg) x velocity (ms-1)
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Principle of Conservation of momentum
providing no external forces act the total momentum before a collision is equal to the total momentum after a collision measured in the same direction
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Elastic collision
kinetic energy is conserved as well as momentum
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Newton's Second Law
The rate of change of momentum is proportional to the resultant force acting on it and takes place in the same direction as the force
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Impulse
The product of the force and the time for which it acts- and hence impulse is the change in momentum of the object on which the force acts. Equal to the area under a force-time graph.
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Cetripetal force
produces centripetal acceleration and acts towards the centre of the circle
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Simple harmonic motion
an oscillation in which the acceleration of an object is directly proportional to its displacement from the midpoint and is directly towards the midpoint.
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Newton's Law of gravitation
Every particle of matter attracts every other particle of matter with a force which is directly proportional to the product of their masses and inversely proportional to the square of the distance between them
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Gravitational field strength, g
gravitational force exerted on a unit mass placed at a certain point in the field (NKg-1)
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Gravitational potential V
the work done in moving a unit mass from infinity to that point, area under a force-distance graph gives the work done
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Kepler's law
T squared= 4pi squared x distance cubed divided by GM
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Coulombs Law
The force acting between two charges is proportional to the product of the charges and inversely proportional to the square of their separation.
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Electric field strength
the force acting on a unit of positive charge placed at a certain point in the field (NC-1)
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Electric potential
the work done us moving a unit positive charge from infinity to a certain point- scalar
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Faraday's Law
the induced emf is directly proportional to the rate of change of flux linkage
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Lenz's Law
The induced emf is always in such a direction as to oppose the change that caused it
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## Other cards in this set

### Card 2

#### Front

surface area, insulator type, distance between plates

#### Back

Factors affecting capacitance

### Card 3

up, up, down

#### Back ### Card 4

down, down, down

#### Back ### Card 5

#### Front

area under a Q-V graph

#### Back ## Comments

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