Question

1. Give reasons for the following:
a. We put oil in machine parts
b. A magnet is used in a junk yard.
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Answer 1

Explanation:

a.without oil machine parts can't work.

b.the magnet is use to pull and hold the junk.

Answer 2

Answer:

a: The heat energy tends to damage the parts of machine. Oil works as a greasing material. Greasing material is used to reduce the friction between the moving parts of the machine. This property of Grease result in smooth movement of the machine or relative motion among the parts of the machine

b: "Junkyard magnets used to pick up old cars produce fields of about 1 T." Lifting magnets have a variety of uses. For example, these magnets can be used to search for metal objects in tanks or places that are difficult for a human being to reach. Lifting magnets can also separate metal particles in oil and water.

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