Topic 2
Refraction Notes

In Earth’s atmosphere, light travels at a speed of 300000 km/s.
When light travels through different mediums (substances or objects), it changes speed. Light bends or refracts when this happens.
The more dense the medium, the greater the angle that light will bend.

Example: Light will bend more when it passes through a diamond rather than water, because diamonds are more dense.
Q. Will light refract more in salt water or fresh water?

Practice Questions to prepare for quiz Feb 4 & 5

Practice Questions

1. Name the four properties of light

2. Describe the difference between luminous and non-luminous objects. Give two example for each term.

3. Create a table to describe the early light ideas and the scientists that studied light.

4. Draw and label light rays reflected into a plane mirror. Measure the angles.

5. Define transparent, translucent and opaque

6. Describe two main differences between reflecting and refracting telescopes.

Light and Optical Systems

Topic 1 Vocab

Optical device
Microscope
Refracting telescope
Reflecting telescope
Binoculars

Topic 2 Vocab

Intensity
Translucent
Opaque
Non-luminous
Luminous
Regular reflection
Diffuse reflection
Incident rays
Plane mirrors
Angle of incident
Law of reflection
Concave mirror
Convex mirror
Refraction
Lens
Focal length
Angle of reflection

Nov. 17-21

This week we will have a Science-in-a-crate to help us explore simple and complex machines. We will be working in lab groups and will be examining gears, levers, hydraulics, Pascal's Law and many other concepts to do with machines.

Here is the vocabulary that you were asked to complete in class:

Mechanical Advantage
Speed Ratio
input force
output force
friction
efficiency
work

For homework you are expected to complete the questions in your lab booklet as well as to finish your vocabulary.

See you in class!

Upcoming Important Dates:

8H

Oct. 24th- Last day to hand in missing assignments
Oct. 31st- Technology brochure/poster due
Oct. 31st- Mix & Flow unit test
Nov. 7th- Report card 1 goes home

8G

Oct. 24th- Last day to hand in missing assignments
Oct. 30th-Technology brochure/poster due
Oct. 30th- Mix & Fow unit test
Nov. 7th- Report card 1 goes home

Questions for the portfolio reflection

Science 8 Portfolio Reflection

1. The three most interesting things I have learned so far in Science this year include:

2. So far, the work habits that I have developed in Science are (circle one) Excellent/Satisfactory/Poor. I can improve by doing the following three things in class and the following three things at home:

3. Are you meeting your HIGHEST standard? Miss Simpson’s HIGHEST standard? Explain in a half page journal entry, using examples.

Floating Coke Cans

How does the particle model of matter and density explain what is happening to these Coke cans?