Lesson 2
Showing energy changes
Objectives:
Be able to draw a Sankey diagram
Be able to use a Sankey diagram to calculate energy changes
PART A
Watch this video experiment. It involves energy changes - magnetic and kinetic energy. And no, don't try this at home!
PART B
Read and copy this sentence about showing energy changes.
We can show a conversion from one form of energy to another on a Sankey diagram. This shows how much energy is changed into each new form.
PART C
Copy this diagram and the writing onto your paper.
PART D
Watch this video again - just watch from 16 minutes and 18 seconds. (16:18)
PART E
Watch this video of the clockwork toys. What energy change is happening here? (you don't need to write down your answer).
PART E
Draw this energy change for the clockwork toy on paper (you don't need to draw the toy).
PART F
Now copy this Sankey diagram for the toy. Copy the writing and labels too.
PART G
Now copy this:
PART H
Copy these out and work out the missing energy in each one.
Head phones 200J Electrical energy ----> 190 J Sound energy + ? Heat energy
Car horn ? Electrical energy ---> 450 J Sound energy + 50 J Heat energy
Car engine 20000 J Chemical energy ---> 18500 J Kinetic energy + 1000 J Heat energy + ? Sound energy
Collision 18500 J Kinetic energy ---> 16000 J Sound energy + ? Heat energy
PART J
We can draw Sankey diagrams accurately on graph paper to show the amount of energy in each part of the transfer. (You don't have to copy or print this diagram).
PART K
Try this quiz to finish.