P1-Energy Flashcards
Equation for kinetic energy
Kinetic energy =1/2 x mass x speed squared
Ek=1/2mv squared
Equation for GPE
GPE= mass x gravitational field strength x height
Ep=mgh
Equation for power
Power=work done/time taken. = energy transferred/time taken
P= W/t =E/t
Equation for efficiency
Efficiency = useful energy output/total energy input
Efficiency =useful power output / total power input
What is kinetic energy
The energy an object has because it is moving
What is GPE
The energy an object has because of its position
What is elastic potential energy
The energy stored in a springy object when u stretch or squash ut
What is thermal energy
The energy a substance has because of its temp
What is chemical energy
The energy stored in fuels foods snd batteries
What is conservation of enrrgy
Energy can not be created or destroyed only transferred
What is work done
The force applied to an object to move it a distance
What is dissipation
The process of energy being transferred or lost to the surroundings
What is friction
A force that opposes movement
What is a system
And object or a group of objects
What is useful energy
Energy in the place it is wanted and in the form it is needed in
What is a closed system
An isolated system where no energy transfers take place into or out of the energy stored in the system
What is wasted energy
Energy that is not usefully transferred. Usually as thermal
Name 4 ways energy is transferred
Heating waves electric current force when it moves an object
Describe what happens to a falling object
Decreases its gpe stores. Increases its ke stores as it falls. Waste energy transferred as thermal or sound
Equation for elastic potential energy
1/2 x spring constant (k) x extention squared
Equation for work done
Force applied x distance moved
What is the equation for spring constanr
Force/ extension
What does poportional mean
When one increases the other also increases
Equation for thermal energy
Energy=mass x SHC x temp chnage
C= delta E /m x delta fita
What is a systematic error
Error in ur method
What is a random error
An error that is different everytime
Name some errors
Zero error Reading thermometer wrong
Energy to do with heater
Energy=power of heater x time
How many joules are in a kilojoule
1000
What is covection
Heat transfer in fluids
What is conduction
Heat transfer thru direct contact of materials
What does high conductivity mean
High energy flow
Why is double insulating windows good
Bc both glass and air have low thermal conductivity compared to other materials such as copper. Low energy flow. The temp inside wont espace house. Less heat transferred per second
What is shc
How much energy ut takes to raise 1kg of a substance by 1 degree celcius
What does renewable energy mean
The resources can replenish faster than it is being used. It is an infinite resource.
Why is air a bad conductor of heat
Bc it has a high shc snd the particles r spaced out
What is nuclear energy
The forces acting between atomic nuclei
What is magnetic energy
The energy something with a magnetic field has
What is elctrostatic energy
The forces acting between charges
What is equation for speed
Speed=distance/time
