Name: _


Key Concepts
Vocabulary


What is energy?
Forms of energy
Conversion of energy
Heat energy and how it is transferred
Light energy and how it travels
Sound energy and the nature of sound waves
4.1
Forms of energy:
- Heat, Light, Sound
- Electrical, Chemical, Nuclear
- Kinetic, Gravitational, Elastic
Inefficient/efficient
Fossil fuels
4.2
Heat
Temperature
Conduction
Insulators
Convection
Radiation
Electromagnetic
Absorbed
Reflected
Transmitted
4.3
Luminous
Non-luminous
Incandescent
Bioluminescent
Shadows
Umbra
Penumbra
Reflection
Real and virtual images
Inversion
Concave
Inverted
Focus
Convex
4.4
Sound wave
Echo
Sonar
Radar
Reverberation
Resonate
Amplify








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Priority

Activities
Pracs
Homework Book
Questions from text book
Extension and variations
4.1 Energy
Forms of energy mix & match
Chemical energy (p. 93)
Releasing the sun’s energy (p. 93)
Energy changes (p 32-3)
Revision (p. 91 Q 1-9)
Thinking (p. 92 Q 10-13)
Science at work activities (p. 92)
4.2 Heat
Heating role play
Conductors worksheet
Comparing materials (p. 102)
Comparing metals (p. 103)
Conduction in water (p. 103)
Insulators (p. 104)
Convection currents (p. 104)
Radiation emission (p. 105)
Radiation absorption (p. 105)
Other temperature scales (p. 34-5)
Revision (p. 100 Q 1-13)
Thinking (p. 100 Q 14-18)
Science at work activities (p. 101 & 102)
4.3 Light
Tracing objects using a mirror
Animation: http://psy2.ucsd.edu/~sanstis/Foot.html (see ‘Step Through Time’ Prac for Explanation)
Light stations activity/pracs
Law of reflection teacher demonstration
Light stations activity/pracs
The pinhole camera (p. 113)
The law of reflection (p. 113)
Image location (p. 114)
The periscope (p. 115)
Making rainbows (p. 115)
Curved mirrors (p. 116)
Applications of laser light (p. 36-7)
Revision (p. 110 Q 1-14)
Thinking (p. 101 Q 15-19)
Science at work activities (p. 112)
4.4 Sound
Sound worksheet
Research Task
Sound in a vacuum (p. 123)
A sound cannon (p. 123)
The speed of sound (p. 124)
Measuring cylinder resonance (p. 124)
A sonic wave generator (p. 38)
Morse code (p. 39)

Greek theatre

http://www.sciencedaily.com/releases/2007/04/070404162237.htm
Revision (p. 121 Q 1-14)
Thinking (p. 121 Q 15-21)
Science at work activities (p. 122)
Revision


Heat, Light & Sound Crossword (p. 40)
Sci-words (p. 41-43)
p. 125 Qs 1-25

Assessment
Research Task
Test
mind map types of energy and some examples.jpgEnergy-transformations_1qhe164n.jpg




Heat and conduction


The spoon experiment


Draw a picture of the spoon experiment _ label the different spoons and the glass beads




Which one conducted heat best? The metal spoon. How did you know? The glass bead fell off this spoon first because the wax melted.

Which ones would be good insulators? wood and plastic because they don't conduct heat very well. The wax did not melt and so the bead stayed on the spoon.


The metal rod experiment


Draw a picture of the metal rod experiment. - Label the different types of rods and the glass beads

Which one conducts heat the best? Copper conducts heat best.

What happens when heat is conducted? For heat to be conducted each atom has to start vibrating until it bumps into the atom next to it. When it does this the Energy (heat) is passed on. In an insulator the atoms are held so tightly that they can't vibrate much and pass the heat energy on to the next atom.

Testing the Law of reflections

Aim: To test the law of reflection.

Method:

set up as shown
Each member of the team will need to trace the mirror and the ray box on a page in their book.
Plot the light rays path as it is reflected off the mirror.

Results

Sample results from the class
Trial
Angle of Incidence
incoming ray
Angle of Reflection
outgoing ray
1
30
31
2
62
61
3
18
18
4
35
35

Conclusion

The Law of reflection states…
Our results show that this is true on most cases but sometimes we are 2 or 3 degrees out. In this experiment this is an error due to the thickness of our pencil. So we could say that our experiment upholds the law of reflection.

All about Light

Light is a form of energy. To explain its properties we say its energy travels in waves. These waves travel in straight lines. This is why we can't see around corners.. Light can be reflected, refracted, dispersed and scattered.

When light is reflected from a plane mirror (flat mirror) we can see our image at about the distance behind the mirror as we are in front of the mirror. We know there is no real person inside the mirror - but we call this image a virtual image.

An image that can be projected onto a screen is called a real image. You can do this with curved mirrors.
Curved mirrors can focus light to a point. The lens in your eye focusses light on to the retina of your eye so you can see clearly. If it is not clear you need glasses. These lenses correct the focussing of your lens.

There are two types of mirrors.
1. A concave mirror - has a dip in the centre. They can produce an upright enlarged virtual image when the object is up close OR an inverted real image if the object is further away.

2. Convex mirrors - are bowed out at the centre and are used in shops and intersections to observe what is coming along. They produce a smaller virtual image behind the the mirror.

Exploring the concave mirror

draw the image that was projected onto the screen, draw the position of the candle and the mirror.

Was it a real image or a virtual image?
Was it right side up or an inverted image.


Exploring the convex mirror

Turn the mirror around and try the experiment again - can you project an image? Can you see an image in the mirror?

Making a rainbow

Draw a labelled diagram of the equipment you used to make a rainbow. label the colours of the rainbow.
What other ways are there to make a rainbow?

Questions from text p 110
Q 2, Q8, Q11, Q13 Q17, Q20, Q21

The speed of light
http://speedoflight2012.org.uk/


the speed of light = 299 792 458 m / s

More about calculator.

the speed of sound


http://www.physicsclassroom.com/class/sound/u11l2c.cfm


Sound

Sound is a form of energy. Sound needs something to travel through, unlike light. While light can travel through a vacuum sound can not. Some movies show explosions in space that are very loud BUT this is not accurate. Because there is nothing for the sound energy to travel through - there would be no noise.

When we examine sound it is made of vibrations. The sound energy makes air particles vibrate and bump into the particles next to them. Different sounds cause different patterns of vibration. The patterns in the air make some parts compressed and other parts spread out.

Types of waves

Sound is an example of a longitudinal wave - the particles move back and forward as the energy is passed along.

Another type of wave is a transverse wave - the particles move at right angles to the direction of the wave ie up and down like a water wave.

Speed of sound

Depending on what the sound is travelling in the sound wave will have a different speed. In air at room temperature (20degrees Celsius) it should travel at 343m/s. At 0 degrees Celsius it travels at 330 m/s and in water it travels at 1400 m/s but in wood it travels at 4500 m/s

How does density of a substance affect the speed of sound travel?
The Greek AmphiTheatre was a marvellous structure that enabled the audience to hear the spoken word from the back of this immense theatre. Many researchers came up with the idea that the shape was the main reason for the ability of the theatre to amplify the sound. however read this to find out what they think really made the sound carry.
http://www.sciencedaily.com/releases/2007/04/070404162237.htm


Making A string and cup phone
Draw and label your string and cup phone.
Why did it work?
When did it not work?

Sound Questions
Revision (p. 121 Q 1, 2, 6, 7, 9, 10, 12, 13, 14)
Thinking (p. 121 Q 15, 17, 19, 21 23, 25 )