4.16

4.16

10 June 2011

11:55
· 4.16 understand the energy transfers involved in generating electricity using:
· wind
· water
· geothermal resources
· solar heating systems
· solar cells
· fossil fuels
· nuclear power

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wind energy story.swf Download this file

Teacher Presentation.ppt Download this file

Srinakarin Hydro Dam, Kanchanaburi.avi Watch on Posterous

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Untitled

ADs_and_DISADs_of_ENERGY_SOURC.docx Download this file

Starter for 4.16

Starter for 4.16

19 August 2011

17:46

<<DragnDropEnergy.swf>>

DragnDropEnergy.swf Download this file

Entrance Activity

Entrance Activity

19 August 2011

17:44

Tell the person next to you...

Starter.ppt Download this file

Answers

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4.14

4.14

10 June 2011

11:53

·         

4.14 describe power as the rate of transfer of energy or the rate of doing work

"Rate" just means "divided by time" (see Entrance Activity)

So

Power = Energy / Time

or

Power = Work done / Time

4.14 Entrance Activity Answers

4.14 Entrance Activity Answers

19 August 2011

17:17

Tell the person next to you...

·         You can run up the stairs in the Science block in 30 seconds.

·         Mr. Roff can run up the stairs in the Science block in 20 seconds.

·         Who is the most powerful?  Why?

·         Mr Roff.  He does more work running up the stairs (because has a higher weight) in a shorted time so he is more powerful

 

·         It takes 2 minutes to fill the 20 litre sinks in this room with water. 

·         How fast is the sink filling?

·         10 litres/min

·         At what rate is the sink filling?

·         10 litres/min

·         How long would it take to fill a 10 litre sink?

·         1 min

Power questions

Power is the rate of doing work

Power - in watts - = work done - joules- / time - seconds- 

1 watt is a rate of working of one joule per second 

1. 1000/5 = 200w

2. p=wd/t 

Wd = Fxd

600/6 = 100w

3 p=wd/t

p=30000/4

= 7500w

= 7.5kw

Power questions

19 August 2011

17:30

PFY, p. 120

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4.13

· 4.13 understand how conservation of energy produces a link between gravitational potential energy, kinetic energy and work

CoE.ppt Download this file

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PFY pg 121

19a) w=50x10
w= 500N

b) GPE = MGH
GPE = 50x10x4 GPE = 2,000J

c) KE= 2,000J

Collins pg 91 3a) GPE = 35x10x30 GPE = 10,500J

b) GPE at the top = KE at the bottom 10 500 = 0.5x 35x v squared v squared = 600 v= 24.5m/s c) SOme energy is wasted due to friction

4.10

· 4.10 understand that work done is equal to energy transferred

PFY p.112

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Collins p. 91

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1.
a) Joules => Force => Distance b) Newton => Meter => force d) Energy 2. Wd= f x d
Wd = 5 x 2
Wd = 10J

4. Wd = f x d Wd = 500 x 40
Wd = 20kJ

4.9

·         

4.9 recall and use the relationship between work, force and distance moved in the direction of the force:

       work done = force × distance moved         

Wd = F × d

Work formula.ppt Download this file

4B1 work done skiing downhill.swf Download this file

4B1 work done pushing a wheelbarrow.swf Download this file

Plenary Answers

Untitled

Unit_4_Keywords_and_Definition.doc Download this file

Plenary Questions

PFY p.54

PHYSICS .docx Download this file

4.8

·         

4.8 describe how insulation is used to reduce energy transfers from buildings and the human body

Task 1

·         Use this interactive animations to investigate how different insulation affects the rate of cooling of hot water

<<Cooling of hot water with insulation - interactive.swf>>

Task 2

·         Use these interactive animations to find out about the energy transfers in a house

	<<Types of energy transfers in a house - interactive.swf>>		<<Insulation in a house - % heat losses and savings.swf>>

Task 3

·         Test your knowledge with this quiz

<<Quiz - Types of energy transfers in a house.swf>>

Types of energy transfers in a house - interactive.swf Download this file

Quiz - Types of energy transfers in a house.swf Download this file

Insulation in a house - % heat losses and savings.swf Download this file

Cooling of hot water with insulation - interactive.swf Download this file

4.7

·         

4.7 describe the role of convection in everyday phenomena

Task 1

·         Try the animation

·         Extension: what is happening to the particles in the air?

<<Convection in a room with a radiator.swf>>

Task 2

·         Why is Lee tired after cycling to the Sea in the morning?

·         Predict what will happen when Lee cycles home in the evening

<<Lee cycles towards the sea ... and back worksheet.pdf>>

Lee cycles towards the sea ... and back worksheet.pdf Download this file

Convection in a room with a radiator.swf Download this file

Conduction, Convection and Radiation