Advertisements
Advertisements
प्रश्न
Three forces A, B and C are acting on a rigid body which can turn about O in fig.9. If all the three forces are applied simultaneously, in which direction will the body move? Explain.
Advertisements
उत्तर
The body will move in the direction of net torque
Net torque = sum of clockwise moments - sum of anticlockwise moments
In the given figure, force 40N is acting clockwise and forces 20N and 60N are acting anticlockwise
Net torque = (40 x 3) - [(20 x 2) + (60 x 1)}
= 120 - 100
= 20 Nm
Hence the body will move in clockwise direction about 'O'
APPEARS IN
संबंधित प्रश्न
A brass ball is hanging from a stiff cotton thread. Draw a neat labeled diagram showing the forces acting on the brass ball and cotton thread
A force always produces both the linear and turning motions.
State the condition when the change in the momentum of a body depends only on the change in its velocity.
Calculate the acceleration produced in a body of mass 50 g when acted upon by a force of 20 N.
A spanner (or wrench) has a long handle. Why?
A body is acted upon by two forces of magnitude F but in opposite directions. State the effect of the force if both forces act at the same point of the body.
The moment of a force of 10 N about a fixed point O is 5 N m. Calculate the distance of the point O from the line of action of the force.
(i) What do you understand by the term couple of forces?
(ii) Calculate the moment of a couple shown in fig.
A uniform metre rule rests horizontally on a knife-edge at the 60 cm mark when a mass of 10 gram is suspended from one end. At which end must this mass be suspended? What is the mass of the rule?
