Question
Distinguish between mass and weight.
| Mass | Weight |
| 1.Mass is the amount of matter present in an object. | Weight is the force with which the earth attracts the object. |
| 2.It remains constant everywhere, even on other planets. | It changes from place to place depending on the value of gravity (g). |
| 3.Its SI unit is kilogram (kg). | Its SI unit is Newton (N). |
| 4.It is a scalar quantity. | It is a vector quantity. |
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Study it and answer the following questions:
(1) Name the defect shown in the figure. (Practice Activity Sheet – 3)
(2) Give two possible reasons for this defect of eye in human beings.
(3) Name the type of lens used to correct the eye defect.
(4) Draw a labelled diagram to show how the defect is rectified by using the lens.