1. Energy transfers 2

2. Starter Problem (in pairs) WIND-UP TOYS
Investigate the transfer of Potential energy into to kinetic in…………………..
WIND-UP TOYS

3. WIND-UP TOYS Aim Method: Results:
Find out what happens when you increase the
number of turns of the toy
Method:
Wind up your toy once...twice...3 times...
When you wind up your toy try to do it always in the same way.
Measure how far the toy has moved.
Repeat 4 times Why?
Results:
Fill in the table

4. Distance travelled (m)
Results:
Fill in the table below with your results.
What relationships do you see? Whay evidence do you have ?
Extension
Why did you repeat your results?
What type of graph might you use to present your reults and why?
How reliable where your results and how could you improve this?
Number of turns
Distance travelled (m)

5. 22/11/2018
How do we describe the transfer of energy from Potential to Kinetic?
LO:
All
Most
Some
Be able to describe and explain using Sc knowledge and understanding when Potential energy changes to Kinetic energy in a range of systems and what happens the waste energy that is also transferred.
Be able to describe how Potential energy is transferred in a range of systems giving examples of where and when it is transferred to Kinetic energy. Describing what happens to ‘Waste energy’
Be able to recognise types of stored Energy and state how Potential energy is stored in a range of systems naming some forms it can be transferred into. Recognising that some energy is ‘wasted’ in the transfer.
Keywords:
Law of conservation of energy, chemical store, energy store, thermal, kinetic, gravitational potential, elastic, dissipated, Waste

6. from one form to another
Energy changes
Energy cannot be
made or destroyed,
but
energy can be changed
from one form to another
This is called the Conservation of Energy

7. Conservation of Energy
We can have fun changing potential energy to kinetic
energy.
Top of the hill
Going down
Walking up 2
High potential energy
At the bottom 1 3
Conversion of
kinetic energy to
potential energy
Conversion of
potential energy
to kinetic energy 4
Low potential energy

8. Questions Answer in your groups
What is the energy stored in the spring of the toy ?
Is there a relationship between the number of turns and the distance travelled?
How do you store energy inside the toy.
What happens to the potential energy when the toy is released?

9. Conclusions
The energy stored in the spring of the toy is called POTENTIAL ENERGY.
The more the toy is wound up, the more the energy is stored.
The store of energy is done through tightening the spring inside the toy.
When the toy is released the potential energy is changed into KINETIC ENERGY.

10. Potential to kinetic
ROLLERCOASTERS

11. Potential to Kinetic Consider a roller coaster.
At the top, it has potential energy.
The energy is stored because of its height.
It is energy waiting to be used for motion.
thecoastercritic.com

12. Potential to Kinetic
As the roller coaster moves toward the bottom, kinetic energy increases along with the rollercoaster’s speed.
thecoastercritic.com

13. Potential to Kinetic Watch this roller coaster.
The total energy never changes, it just goes from potential to kinetic and back again.

14. Investigate in your groups
Carry out experiments showing
potential energy being changed into
kinetic energy.

15. Investigate energy changes through 3 experiments:
Aim
Investigate energy changes through 3 experiments:
The car and the slope
The rubber band
The pendulum

16. A car moving down a slope
Find out which kind of energy a car has got:
At the top of the slope (C).
At the middle of the slope (B).
At the bottom of the slope (A).
When you push the car back up the slope. A B C

17. What happens when you let a pendulum go.
2. Rubber band
Find out which happens to a rubber band when stretch it and let go.
ehow.com
Pendulum
What happens when you let a pendulum go.

18. Methods The slope should be 10 cm height.
Run your toy car down the slope.
Stretch the rubber band.
Lift up the pendulum and let it go.

19. Position of the pendulum
Results
Decide in your group how to fill the table.
Type of energy
Position of the car
Rubber band
Position of the pendulum
All potential
Some
potential and
some kinetic
All kinetic
No kinetic
No potential

20. In a light bulb ? energy changes to
Listen and Think
Chemical Energy to other energies:
? energy and ? energy
The bulb does not make light on its own but it shines when electricity is flowing through it.
In a light bulb ? energy changes to
? energy and ? energy.

21. Chemical Energy to other energies
A car needs fuel to make it go.
The fuel petrol is a store of chemical energy.
This chemical energy is changed into other energies.
Fuel rich in
chemical
energy
Heat
Waste products
poor in chemical
Gasoline
Oxygen
Combustion
Kinetic energy
of movement
Water
greenparenthood.com

22. Waste of energy
About 75% of the energy generated by a car’s engine is lost as heat.
auto.howstuffworks.com
You’d have to run about 14 miles to burn all the calories from a pepperoni pizza.
mozzarellispizza.co.uk

23. Waste of energy
We don’t get all of the energy converted into the form we want.
Is this a bad thing or a good thing?
THINK, PAIR, SHARE