physics chapter 1. Energy
- Created by: x.haylss.x
- Created on: 13-03-20 20:24
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- physics C1
- potential energy
- energy associated with an object due to its position or th arrangement of the particles in a system
- elastic potential energy Is energy which is stored in an object as a result to the object being stretched or compressed
- Ee=0.5ke^2
- GPE is energy which an object has because of its position
- GPE=mgh
- kinetic energy
- energy which an object has because of its movement
- increased by increasing mass or speed
- Ek=0.5mv^2
- work done/ energy transfer
- work I sonly done when an object moves
- more work is done when the force is bigger or the object moves further
- W=force X distance
- understanding power
- power is the rate of doing work or transferring energy.
- measured in watts. 1W=1j/s
- power= work done / time
- power= energy transferred / time
- specific heat capacity
- the amount of energy required to change its temperature depends on, mass, material and temperature change
- specific heat capacity is the amount of energy required to rasie the temperature by 1 degrees of a 1kg substance
- change in thermal energy= mass X SHC X temp change
- dissipation of energy
- lubrication is th eprocess of oiling parts of a machine to reduce friction forces. therefore less energy is wasted
- thermal insulation is the process of surrounding objects with a layer of insulation to reduce the rate energy is transferred away the object
- dissipated energy is energy wasted by being transferred to a store it cannot be used in
- energy efficiency
- the law of conservation states that when a system changes, there is no change to the total energy, energy cannot be created or destroyed. only transferred
- efficiency= useful energy output / total input energy
- efficiency= useful power output / total energy input
- using energy resources
- non-renewable energy will run out eventually. they are used quicker than they can be replaced
- renewable energy never runs out. it is replenished quicker than it ist is used.
- global energy supplies
- nuclear power stations release waste which can remain dangerous for thousands of years
- also danger of a nuclear accident which can contaminate an area with radioactive material
- particular technologies may be beneficial to the environment but also very expensive
- energy transfer
- energy does not disappear when it is transferred to another store.
- some substances contain chemical energy. when it is burnt it is transferred into another energy store
- potential energy
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