Advertisements
Advertisements
प्रश्न
State when the moment of force is positive and when it is negative.
Advertisements
उत्तर
If the couple has a tendency to rotate the body in an anti-clockwise direction then its moment is taken positive and if the tendency of rotation is clockwise then the moment is negative.
संबंधित प्रश्न
Write the expression for the moment of force about a given axis of rotation.
On what factors does the effect of thrust on a surface depend?
State Newton's first law of motion. Why is it called the law of inertia?
A spanner (or wrench) has a long handle. Why?
Give an example for each of the following uses of a machine:
to change the point of application of force
A wheel of diameter 3 m is shown in fig. 2 with axle at 0. A force F = 8 N is applied at Q in the direction shown in figure. Calculate the moment of force about:
(i) centre o, and
(ii) point p.
State two factors affecting the turning effect of a force.
A nut is opened by a wrench of length 25 cm. If the least force required is 10 N, find the moment of force needed to turn the nut.
