Topic1- energy Flashcards
What are the 8 energy stores?
- Thermal
- Kinetic
- Gravitational potential
- Elastic potential
- Chemical
- Magnetic
- Electrostatic
- Nuclear
What are the 4 ways of transferring energy?
- Mechanically
- Electrically
- Heating by particles
- Heating by radiation
What is a closed system
Where neither matter nor energy can enter or leave
What is work done
Energy transferred (J)
What are the energy stores and changes of throwing a ball being dropped
Energy is transferred from the balled gravitational potential energy store to its kinetic energy store
Kinetic energy equation
Ek= 1/2mv2
Every
0.5
Meteres
Velocity
Squares
Equation for gravitational potential energy
Eg=gmh
Eg g
Mc
Ham
Equation for elastic potential energy
Ee=1/2ke2
Every
0.5
Kids
Evaporate
Twice
Equation for specific heat capacity
🔺E=mc theta
Every
Moon
COllides
Specific heat capacity investigation
-need a … of m… with 2 …, one for t… and one for heater, … and power …
-measure … of block
-wrap in l.. to reduce heat …
-measure … temp of …
-turn on … and set a …
-record the … and current every … for 10mins
-use P=… to find the power … to the heater in …
-use E=… to find the energy …
-turn … equipment
-… experiment
-find … and plot …, … on y axis energy on …
-need a block of material with 2 holes, one for thermometer and one for heater, ammeter and power pack
-measure mass of block
-wrap in insulation to reduce heat loss
-measure initial temp of block
-turn on power and set a timer
-record the temp and current every min for 10mins
-use P=IV to find the power supplied to the heater in watts
-use E=Pt to find the energy transferred
-turn off equipment
-repeat experiment
-find mean and plot graph, temp on y axis energy on X
Equation for power energy and time
E=pt
Every
Planet
Turns
What is the conservation of energy rule
Energy can’t be created or destroyed only transferred
Where does conduction occur in
Solids
What is conduction
Where vibrating particles transfer energy to neighbouring particles
Explain the process of conduction
-energy is transferred to an objects thermal energy store
-this energy is shared across the kinetic energy store of the particles
The particles vibrate and collide
-energy is transferred during these collisions to the kinetic energy store
What is thermal conductivity
How quickly energy is transferred through a material
What does it mean if an object has a high conductivity
They transfer energy quickly between their particles
Where does convection occur
In liquids and gases
What is convection
Where particles move away from hotter to cooler regions
How does convection work
-energy is transferred to the thermal energy store of the particles
-the energy is shared across the kinetic energy store
-the heated region particles move faster and the space between particles increases
-this means the he density of the heated region decreases
-the warmer, less dense region rises
-the cooler denser regions sink
-the cooler particles heat up and rise, repeating the process
