2.12 To build your own dynamometer  (Page 2/2)

______________________________________________. that the earth exerts on it.

4. Let’s see what you know. Do turn back to the earlier work in the module if you are unsure of yourself. This means that you may refer to the module as a source of information.

(a) Write one sentence to explain what we mean when we speak of force.

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(b) What is the unit that we use for measuring weight? ________________________

(c) Which instrument is used to measure the weight of an object?

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(d) What is your mass? _________________________________________________

Consider your body as an object. What is the weight of your body in

Newton?______________________________________________________________

(e) What is weight?

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(f) Name three forces that are exerted around us in nature.

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(g) Name two kinds of force that can be exerted.

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(h) Name five effects of forces on objects.

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(i) Underline the example that illustrates the force of gravity.

(i) Magnets that repel one another.

(ii) A person doing a long jump.

(iii) A spoon falling off the table and landing on the floor.

(iv) Two people running into one another.

(j) When forces cause an object to move in a circle, we say that they cause

a ________________________________________________________ of the object.

Summative (10)

5. A journey through space

The most difficult part of space travel is escaping the Earth’s gravity. Space travellers need rockets to travel to outer space. A rocket is a powerful engine that is strong enough to overcome gravity and to guide the spacecraft into space.

On 25 April 2002, Mark Shuttleworth became the first South African and African to undertake space travel.

Assessment

Learning Outcome 2: The learner will know and be able to interpret and apply scientific, technological and environmental knowledge.

Assessment Standard 2.4: We know this when the learner application of knowledge: applies knowledge appropriately by connecting the learnt concept to a variation of the known situation:

2.4.1: identifies the forms of energy that are transferred.