In In Ngoma village, a certain old man has been living in darkness in his hut. You felt pity for him. One evening, you decided to visit him and found that all he had in his hut were an empty tin, paraffin, a cotton cloth, and a razor blade for cutting the cloth and a box of matches.
Task
Develop guidelines the old man should follow to use the available materials at his home to solve the problem of darkness in his hut.
In this chapter, you have learnt that:
A force is either a push or a pull.
Forces cause a change in the state of rest or motion of a body.
The unit of force is a newton (N). Forces are vector quantities; they have both magnitude and direction.
There are two types of forces: contact and non-contact forces.
There exists gravitational force that interacts with all objects.
The weight of a body depends on its location.
Friction exists in all aspects of motion on earth.
Friction can be reduced. Friction is both useful and wasteful in various situations.
Surface tension is useful for supporting life on earth.
Natural application of adhesion and cohesion supports the lives of both animals and plants on earth.
Capillary effects are due to both adhesion and cohesion.
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