Login

Please solve the 15 number.
Please do not provide any link.

Please solve the 15 number. Please do not provide any link. 8. 9. 10. 11. 12. 13. 14. 15. y tne Clockwise and anticlockwise moment of force ? When is it taken positive ? State one way to reduce the moment of a given force about a given axis of rotation. State one way to obtain a greater moment of a force about a given axis of rotation. Why is it easier to open a door by applying the force at the free end of it ? The stone of a hand flour grinder is provided with a handle near its rim. Give reason. It is easier to turn the steering wheel of a large diameter than that of a small diameter. Give reason. A spanner (or wrench) has a long handle. Why ? A jack screw is provided with a long arm. Explain why ? A, B and C are the three forces each of magnitude 4 N acting in the plane of paper as shown in Fig. 1.26. The point O lies in the same plane. (i) Which force has the least Fig. 1.26 moment about O ? Give reason. m c 2 2 25 (ii) Which force has the greatest moment about O ? Give reason. (iii) Name the forces producing (a) clockwise, (b) anticlockwise moments. (iv) What is the resultant torque about the point O ?

Dear Student
Moment of force or torque is the tendency of a force to rotate an object about an axis.

It is given by the formula : boldsymbol tau = mathbf{r} times mathbf{F} , !

gAs all forces have same magntiude hence force which is at least distance from poitn O will produce least moment of force. Force which is at greatest distance from point O produce greatest moment of force.
(i) Force C
(ii) Force A

(/iii) A and B will produce clockwise moment
C will produce anticlockwise moment

(iv) Resultant torque
Anticlockwise momen tis negative and clockwise is taken as positive. Hence
Resultant Torque = 
4 x9 +4 x8 - 4x 6 = 36 +32-24 = 44

Regards

  • -1
View Full Answer
What are you looking for?