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
QUICK ANSWER…
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:
- A is the right answer. the both moments are the same.
- B is incorrect.
- C is incorrect.
- 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 /
