Potential & Kinetic Energy
Energy Transformations
Energy Transfers
Flowcharts/Sankey Diagrams
Lucky Dips
100
List four different types of energy
Gravitational Potential, Chemical, Elastic Potential, Nuclear, Kinetic, Electrical, Light, Sound, Thermal (Heat)
100
What is an energy transformation?
An energy transformation is the movement of energy from one form to another.
100
What is an energy transfer?
An energy transfer is the movement of energy from one object to another
100
List the wasted energy in the Sankey diagram below.
Thermal energy and sound energy.
100
The Law of Conservation of energy states that …
Energy cannot be created or destroyed. However, it can be transformed from one energy type to another or transferred from one object to another.
200
Describe the difference between kinetic and potential energy (include examples)
Potential energy is stored in objects that have the ability to move or make things happen (ball balanced on hand), whereas, kinetic energy can be found in objects that are moving (ball moving).
200
Provide an example of an energy transformation
*needs to be accurate example - such as electrical energy changing to light in a lamp, or eating an apple
200
Describe the energy transfer taking place in the image below.
The energy transfer is heat energy from the stove top from the saucepan
200
Draw a flowchart to show the energy transformation that occurs when a TV is in use.
Electrical => Light => Sound => Heat
200
List two types of energy that are often lost in an energy transformation/transfer.
Heat and sound energy are often lost during an energy transformation/transfer.
300
Identify the types of energy present before, during and after the event depicted below.
Before the image, there would be kinetic energy used to stretch the bands. During the image the band contains elastic potential. After the image, there would be kinetic energy again as the bands return to their original state.
300
Determine all the possible energy transformations that might occur in a Rube Goldberg Machine.
All the energy types can occur.
300
Describe the energy transfer taking place in the image below.
The energy transfer is kinetic energy from his foot to the soccer ball.
300
How much energy in the energy transformation is useful?
100 joules of energy is useful
300
Provide an example of a type of kinetic energy, and where you might find it.
Must be valid example include details (teacher discretion)
400
Outline what energies apply on a cricket ball after it has been bowled. Explain.
GPE, thermal, KE, Sound energy
Gravitation potential energy as it is above the ground, thermal energy in hand transfers to ball, kinetic as ball moves, sound as ball hits the ground.
400
Describe the energy transformation/s that occurs whilst a tree is chopped down with a chainsaw.
Chemical energy is transformed into kinetic energy for the logger, while chemical energy from the battery is converted into electrical energy, then kinetic, sound and heat energy. Gravitational potential results in the tree falling.
400
Describe the energy transfer taking place in the image below.
The energy transfer is kinetic energy from the bowling ball to the pins.
400
Draw a Sankey Diagram to illustrate the transformation in the scenario below:
A television converts electrical energy to light energy, sound energy and thermal energy.
400
Outline what actions would be occurring when a person kicks a ball. Including the energy tranfers in both the person and ball.
The chemical potential energy from the person would be transformed into kinetic, while the potential energy in the ball would be transformed into kinetic through the transfer of their kinetic energy.
500
Design a situation where energy goes from potential energy to kinetic and back to potential.
Soccer ball is stationery (potential), then it is kicked (kinetic), stops rolling (potential)
500
Describe what energy transformations would occur in closing the classroom door. Explain whether or not this is efficient, and how it could be made more efficient.
Answers may vary. Example-
Gravitational potential to kinetic (mechanical), sound and thermal energy. This is a relatively efficient situation as most of the energy goes to movement.
500
Describe the difference between an energy transfer and an energy transformation.
Points if answer is complete (teacher discretion)
500
Why must the energy input equal the energy output in an energy transformation?
The Law of Conservation of Energy states that energy cannot be destroyed.
Therefore, if 100J is transformed, 100J of energy must still be present after the transformation, even if some of that energy becomes ‘wasted’ energy.
500
Estimate what the mass would be when the temperature is 120°C
The approximate mass would be 190g