Advertisements
Advertisements
Question
A couple of 15 N force acts on a rigid body, such that arm of couple is 85 cm. Calculate moment of couple in the SI system.
Advertisements
Solution
Moment of couple = Force × Arm of couple
= 15 × 85 N-cm.
= `15xx85xx1/100` Nm.
= 15 × 0.85
= 12.75 Nm.
APPEARS IN
RELATED QUESTIONS
What is the SI unit of the moment of force?
Less force is needed when applied at a farther distance from the pivoted point.
State the S.I. unit of moment of force.
State two factors on which affect moment of force.
Find the moment of force of 20 N about an axis of rotation at distance 0.5 m from the force.
State Newton's first law of motion. Why is it called the law of inertia?
Explain the motion of a planet around the sun in a circular path.
Fig. shows a uniform meter scale weighing 100 N pivoted at its centre. Two weights of 500 N and 300 N are hung from the ruler as shown in fig.

(i) Calculate total clockwise and anticlockwise moments.
(ii) Calculate difference in clockwise moment and anticlockwise moment.
(iii) Calculate the distance from O where a 100 N weight should be suspended to balance the meter scale.

A metal rod AB of length 80 cm is balanced at 45 cm from the end A with 100 gf weights suspended from the two ends.
- If this rod is cut at the center, C, then compare the weight of AC to the weight of BC. (Use >, < or =)
- Give a reason for your answer in (a).
The diagram in Fig shows two forces F1 = 5 N and F2 = 3 N acting at points A and B respectively of a rod pivoted at a point O, such that OA = 2 m and OB = 4 m.

Calculate:
- the moment of force F1 about O.
- the moment of force F2 about O.
- total moment of the two forces about O.
