Heat
Conduction is the process of heat being transferred through particles colliding (i.e. objects must be touching).
What is one example of heat transfer?
Hot pan on a hot plate.
Placing hand in fire.
Metal spoon in hot coffee.
Finish the law of conservation of energy:
Energy cannot be created or...
destroyed
A ceiling fan uses electrical energy to start moving. What type of energy does it have when it is moving?
Kinetic
Does sound move through waves, particles or both?
Both
Does light move via waves or particles?
waves
Convection is the process where hot air/liquid _______ and cold air/iquid _______.
Hot air rises, cold air falls.
Finish the law of conservation of energy:
Energy cannot be ...
created or destroyed
Complete the energy flow diagram with the missing main type of energy:
A kettle boiling water:
Electrical energy -> Heat energy (kettle) -> ___________(water)
Heat energy
A sound wave is a longitudinal wave. Does this mean that the particles move side-to-side or up-and-down?
side-to-side
How is current electricity made (in terms of particles).
The negative particles (electrons) move away from the negative side of the battery towards the positive side of the battery (because opposites attract), creating an electrical flow.
Name the three types of energy transfer.
Convection, Conduction and Radiation
Energy cannot be created or destroyed (only transferred/transformed)
When kicking a ball up a hill, the energy flow diagram is as follows:
Kinetic (person) -> Kinetic (ball) -> GPE
What are the two missing wasted energies?
Heat and sound.
A sound wave is made up of _____________ (particles are close together) and ___________ (particles are far apart).
compressions and rarefactions
When hot water rises and cold water falls, this process is known as...
Convection
Give an example of convection.
Hot water being dispersed in a pot of boiling water.
Hot air balloon.
What is the difference between transferring energy and transforming energy?
Transfer - energy moves from one object to another.
Transform - energy changes from one type to another.
Complete the energy flow diagram for a ball being dropped and then bouncing back up:
GPE -> _________ (wasted sound and ______) -> _________ (wasted __________and__________)
GPE -> kinetic (wasted sound and heat) -> GPE (wasted sound and heat)
Describe in terms of particles and waves how sound is transferred across a room.
When a sound is made, particles vibrate. These vibrating particles bump into the particles next to them, which creates a chain of moving particles. This is what is called a sound wave.
What type of science are we learning this term?
(physics? chemistry? biology? earth and space?
physics
What is a difference between radiation and convection / conduction?
Convection / conduction transfers heat through particles, while radiation transfers heat through waves.
Convection / conduction must have touching objects to transfer heat, while radiation does not.
800 / 2000 x 100
= 40%
Create an energy flow diagram for a kettle boiling water (including wasted energy).
Hint: There should be 3 main energy transfers to get from electricity being supplied to the kettle, to the water boiling.
Electrical energy -> Heat energy (kettle) and wasted sound energy -> Heat energy (water) and wasted sound energy
Sound proofing in a music studio absorbs sound to reduce noise. Why does this occur (think about the particles and the energy transformation)?
The particles in the sound proofing do not vibrate well, so the sound energy is transformed into heat energy
How does a fibre optic cable work?
It is a glass/plastic tube that is hollow, and the light shines through the centre, bouncing back and forth down the tube.