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4138165
Physics 2A Continued
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Mind Map on Physics 2A Continued, created by Nicole Wyatt on 28/11/2015.
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Nicole Wyatt
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Nicole Wyatt
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Physics 2A Continued
Work and Potential Energy
When a force moved on and object through a distance, energy in transferred and work is done
Work done= Force x Distance
Gravitational Potential Energy is energy due to height
Gravitational Potential Energy = Mass x Gravitational Field x Height
Kinetic Energy
Kinetic Energy is energy of movement
Kinetic Energy = 1/5 x Mass x Speed
Kinetic Energy transferred is work done
1/2mv = F x d
Falling objects convert Ep into Ek
Forces and Elasticity
Work done to an Elastic object is stored as Elastic Potential Energy
Extension of an Elastic object is Directly Proportional to Force
Force = Spring Constant x Extention
But it stops working when the force is too great
There is a maximum force that the Elastic object can take and still extend proportionally
Power
Power is the 'Rate of doing work' - i.e How much per second
Power = Work done / Time Taken
Power is measured in Watts (J/s)
Calculating the power output is either the amount of Kinetic Energy gained or the amount of Potential Energy gained
Momentum and Collisions
Momentum = Mass x Velocity
Momentum is the property of moving objects
The greater the Mass of an object and the greater the Velocity, the more Momentum the object has
Momentum before = Momentum after
Forces cause changes in Momentum
A larger force means a faster change of momentum (so a greater acceleration)
Static Electricity
The build up of Static is caused by Friction
Only Electrons move, the negative charges never move
Like charges repel, opposite charges attract
Charges can move easily through Conductors
Current and Potential Difference
1) Current- Rate of flow of electrons in a circuit
2) Potential Difference- The driving force that pushes around the current
3) Resistance- Slows down something in a circuit
Total charge through a circuit depends on Current and Time
Current = Charge / Time
Potential Difference is the Work Done per unit charge
P.D = Work Done / Charge
Resistance
Resistance increases with Temperature
P.D = Current x Resistance
Series Circuits
1) Potential Difference is shared
2) Current is the same everywhere
3) Resistance adds up
4) Cell Voltages add up
Ammeters are connected in series
Parallel Circuits
1) P.D is the same across all components
2) Current is shared between branches
Voltmeters are connected in parallel
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