# In the above diagram MN is perpendicular to ON and MP…

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In the above diagram MN is perpendicular to ON and MP. What is the difference between the moment about N of the force of 20 Newtons applied along MP and its moment about O?

A. zero

B. 0.2N.m

C. 0.4N.m

D. 0.8N.m

A

## DETAILS…

Recall, moment = force x perpendicular distance

If a force of 20N is applied along MP, then:

Moment of this force about N = 20 x MN

Now, using Pythagoras theorem to find MN, we have:

Moment about O = 20N x 0.4 = 8N.m

Hence, the difference between the two moments will be = 8 – 8 = 0

### Now for the right answer to the above question:

1. A is the right answer. the both moments are the same.
2. B is incorrect.
3. C is incorrect.
4. D is incorrect.

## KEY-POINTS…

You may please note this/these:

• Moment = force x perpendicular distance.
• For the both cases, the perpendicular distances of the force from N and O are the same.

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/ culled from 2020 JAMB-UTME physics past question 10 /