1. (i) Two forces of magnitudes 20N and 35N act on an object in the same direction. What is magnitude of the net force? (ii) How can you use a plastic comb to pick up tiny pieces of paper?
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(i)net force = force 1 + force 2
=20N + 30N
= 50N
(ii)Take a plastic comb rub it on your hair and take it near to tiny pieces of paper.......
BOOM....Magic happens...The paper pieces get attracted to the comb...
The Secret behind the magic
When a comb is run through your hair charges pass between your hair and the comb, so the comb becomes charged either positively or negatively, and the paper is oppositely charged...by this the both opposite charges attract....
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