# Physics Unit 2

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What is Gravity?
A pulling down force to hold everything at the centre of the earth
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What are forces mesasured in?
Newtons (N)
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What is the formula for calculating force?
F = M x A
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What is Mass & Acceleration measured in?
Mass = (Kg) Acceleration = (M/S²)
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Resultant Force
If a resultant force is applied to an object, it will accelerate in the direction of the force. If the object is moving with a constant speed, the resultant force on it is zero
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What does Force mean?
A push or pull experienced by an object when it interacts with another. A force is needed to change the motion of an object.
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What does Mass mean?
The amount of matter contained in an object
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What does weight mean?
Measure of the earths gravitational pull on an object. Weight changes depending on gravity
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What is Free Fall?
Any object which is being acted upon only by the force of gravity is said to be in a state of Free Fall. All Free Falling objects (on earth) accelerate downwards at a rate of 9.8m/s² (oftern approx as 10m/s²)
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What is Elastic Deformation?
Occurs when an object returns to its original shape and size after the forces are removed
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What is Inelastic Deformation?
Occurs when an object does not return to its original shape and size after the forces have been removed
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What is the formual for calculating Hooke's Law?
F = K x E
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What is Extension & Spring Constant measured in?
E = Metres (M) K = In N/M
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What is Work?
Work is when a force moves something. If an object that has a mass is moved then work is needed
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What is the formula calculating for Work Done?
Work Done = Force x Distance moved in direction of force (W = F x D)
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What are the units for W = F x D?
Work Done = Joules (J) Force = Newtons (N) Distance = Metres (M)
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Affect work on mass
A larger object is moved more work is done because a greater force is needed to move it
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Affect work on distance
If an object is moved a greater distance more work is done
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What happens when Work is Done
Work Done = Energy Transfered. Work Done against a frictional force is mainly transformed into heat
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Elasticity & Work
For an object that is able to recover it's original shape, elastic potential is the energy stored on the object when work is done on the object to change its shape
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What is Kenetic Energy?
Kenetic energy is the energy of an object moving. Kenetic energy of an object increases when the object is travelling faster or is very large.
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What is the formual for Kenetic Energy?
Kenetic Energy = (KE) KE = 1/2 MV² M = Mass V = Speed (Velocity)
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What is the formula for Potential Energy?
Potential Energy = PE. PE = Mass x Gravity x Height
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What is Potential Energy?
Potential Energy is the energy possessed by an object due to it's height (PE = M x G x H)
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What are the two factors that AFFECT Potential Energy?
Mass and Height as gravity is a constant. GPE = MGH. G = GPE/MxH. H= GPE/MxG. M = GPE/GxH. GPE= Gravitaional Potential Energy (J)
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What is the formual for calculating Momentum?
Momentum = Mass x Velocity.
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What are the units for Momentum?
Momentum = KgM/S. Mass = Kg. Velocity = M/S
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What are the factors that AFFECT momentum?
Mass = the higher the mass the higher the momentum. Velocity = Increase in velocity leads to increase in momentum
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What is Momentum?
A property of any moving object. Momentum must also be a vector quantity and it therefore has a direction
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What is Speed?
Distance per unit time
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What is the formula for Explosions?
Force = Change in momentum/time. Force x time = momentum. Mass x Velocity = Momentum
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What is Explosions?
The momentum before collision = The momentum after collision
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What is Electrical Charge?
Electrostatics. There are two types of electric charges (Positive & Negative)
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How many uses does Static Electricity has?
1) Photocopiers & Laser Printers. 2) Spray painting cars. 3) Filtering factory smoke 4) Heart Defibrillators
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What is an Electric Circuit?
An Electric Circuit is a path for electirc charge to flow along. Eg. mp3 player
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What is an Electric Current?
An electric current is when electrons start to flow around a circuit. We use an AMMETER to measure it and it is measured in AMPS
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What happenes to the electrons in a circuit?
the electrons go from negative charge to a postive charge
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What charged particles is an electric current a flow of?
Negative charged particles
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What is a current?
A current is "the rate of flow of charge"
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## Other cards in this set

### Card 2

Newtons (N)

#### Back

What are forces mesasured in?

F = M x A

### Card 4

#### Front

Mass = (Kg) Acceleration = (M/S²)

### Card 5

#### Front

If a resultant force is applied to an object, it will accelerate in the direction of the force. If the object is moving with a constant speed, the resultant force on it is zero