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Natural sciences

Energy transfers and forces

A. forces

Educator section

Memorandum

Leaner section

Content

Activity: to report on a human achievement in science [lo 3.1]

Newspapers and magazines published many articles on Mark Shuttleworth’s space travels because he can be regarded as a pioneer in this field. Use these articles as sources of information to write a report (± two folio sheets in length) on his journey. More interesting information and photographs are available on the website: http://www.africaninspace.com.

Guidelines for assembling the contents of your report:

1. Mark Shuttleworth, his dreams and ideals

2. Preparing for the journey

3. Reasons for the journey

4. The journey

5. The significance of the journey for people in general and for South Africa?

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B. Magnetism

It is said that the Greeks discovered a strange type of stone more than 2 000 years ago. While Magnes, a young shepherd boy, was looking after sheep one day, he realised that a strange black stone that exerted so much force on it that he could not withdraw the staff attracted the iron tip of his staff. The fable suggests that the word ‘magnet’ is derived from the name of this boy. Of course, we cannot verify this, but it is a fact that certain kinds of black stone attract similar stones and certain metals. Many such stones are found in the vicinity of Magnesia, in Turkey, and they are called lodestones, or magnet stones. The word ‘magnet’ therefore is probably derived from the name of this city. These stones are natural magnets. We nowadays use synthetic magnets made of iron or steel. These magnets are manufactured to attract objects very forcefully and to retain their magnetism for a long time. The magnets in your school’s laboratory may come in any of the following four different shapes:

Bar-shaped magnets
Horseshoe-shaped magnets
Cylindrical magnets
Ring-shaped magnets

Magnets have to be handled with care to prevent loss of magnetism.

Bear the following in mind when you use a magnet:

  • Do not handle the magnets roughly, i.e. do not drop it or knock against it.
  • Do not heat magnets.
  • Always store magnets with their locking devices in position.

1. magnetic and non-magnetic materials

Magnets do not attract all materials. The following experiment will help us to determine whether a material substance is magnetic or non-magnetic.

Assesment

Learning Outcome 3: The learner will be able to demonstrate an understanding of the interrelationships between science and technology, society and the environment.

Assessment Standard 3.12: We know this when the learner understands science as a human endeavour: compares different interpretations of events

Questions & Answers

a perfect square v²+2v+_
Dearan Reply
kkk nice
Abdirahman Reply
algebra 2 Inequalities:If equation 2 = 0 it is an open set?
Kim Reply
y=10×
Embra Reply
if |A| not equal to 0 and order of A is n prove that adj (adj A = |A|
Nancy Reply
rolling four fair dice and getting an even number an all four dice
ramon Reply
Kristine 2*2*2=8
Bridget Reply
Differences Between Laspeyres and Paasche Indices
Emedobi Reply
No. 7x -4y is simplified from 4x + (3y + 3x) -7y
Mary Reply
is it 3×y ?
Joan Reply
J, combine like terms 7x-4y
Bridget Reply
im not good at math so would this help me
Rachael Reply
how did I we'll learn this
Noor Reply
f(x)= 2|x+5| find f(-6)
Prince Reply
f(n)= 2n + 1
Samantha Reply
Need to simplify the expresin. 3/7 (x+y)-1/7 (x-1)=
Crystal Reply
. After 3 months on a diet, Lisa had lost 12% of her original weight. She lost 21 pounds. What was Lisa's original weight?
Chris Reply
preparation of nanomaterial
Victor Reply
Yes, Nanotechnology has a very fast field of applications and their is always something new to do with it...
Himanshu Reply
can nanotechnology change the direction of the face of the world
Prasenjit Reply
At high concentrations (>0.01 M), the relation between absorptivity coefficient and absorbance is no longer linear. This is due to the electrostatic interactions between the quantum dots in close proximity. If the concentration of the solution is high, another effect that is seen is the scattering of light from the large number of quantum dots. This assumption only works at low concentrations of the analyte. Presence of stray light.
Ali Reply
the Beer law works very well for dilute solutions but fails for very high concentrations. why?
bamidele Reply
how did you get the value of 2000N.What calculations are needed to arrive at it
Smarajit Reply
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Source:  OpenStax, Natural sciences grade 7. OpenStax CNX. Sep 16, 2009 Download for free at http://cnx.org/content/col11077/1.1
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