energy stores and systems Flashcards
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name all of the energy stores
- thermal
- kinetic
- gravitational potential
- elastic potential
- chemical
- magnetic
- electrostatic
- nuclear
name the 5 ways energy is transferred?
- mechanically (work done)
- electrically (moving charges)
- heating
- radiation
- between energy store
what is a system?
a single/group of objects you’re interested in.
what happens when a system changes?
energy is transferred into/away from the system, between 2 objects or between 2 store.
what is a closed system?
a system where neither matter nor energy can enter/leave
what is a net change in a closed system?
the net change in the total energy of a closed system is always 0
Describe the energy transfer of boiling a kettle
energy is transferred to the water (from the kettle heating element) by heating electrically into the waters thermal energy stores
what is work done?
work done is another way to say energy transferred. it can be done when current flows or by force moving an object
what happens when you throw a ball upwards?
initial force is exerted by a person and causes work to be done , energy is transferred from the chemical store in a persons arm to the kinetic energy of the ball and arm
what happens when a ball is dropped ?
the gravity does the work causes energy to be transferred from the balls gravitational energy store to its kinetic energy store
what happens when a car breaks ?
friction between the wheels and the brakes does work as it slows down it causes energy transfers from the wheels kinetic energy stores to the thermal energy stores of the surroundings
which store does eventually all energy end up in?
thermal store
what way can energy use to be transferred?
sound waves
if anything is moving what energy store is it in?
kinetic
what is the equation for working out kinetic energy?
kinetic energy (joules)= 1/2 x mass(kg) x speed(m/s) squared
