Advertisements
Advertisements
Question
Define the moment of force.
Advertisements
Solution 1
The turning effect produced by a force on a rigid body about a point, pivot or fulcrum is called the moment of force or torque. It is measured by the product of force and the perpendicular distance of the pivot from the line of action of force.
Moment of a force = Force × perpendicular distance of the pivot from the force.
Solution 2
The turning effect of force acting on a body about an axis is called the moment of force.
APPEARS IN
RELATED QUESTIONS
An effort is applied on the bigger wheel of a gear having 32 teeth. It is used to turn a wheel of 8 teeth. Where it is used.
What is the SI unit of the moment of force?
Where can a body execute free vibrations?
State two effects of a force when applied on a body.
In Fig. a force F is applied in a direction passing through the pivoted point O of the body. Will the body rotate? Give reason to support your answer.
It is easier to open the door by pushing it at its free end.
A rocket is moving at a constant speed in space by burning its fuel and ejecting out the burnt gases through a nozzle. Answer the following
1) Is there any change in the momentum of the rocket? if yes, what causes the change in momentum?
2) Is there any force acting on the rocket? if yes, how much?
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 diagram in the figure shows a uniform metre rule weighing 100 gf, pivoted as its centre O. two weight 150 gf and 250 gf hang from the point A and B respectively of the metre rule such that OA = 40 cm and OB = 20 cm . Calculate
the total anticlockwise moment about o.
Classify the following amongst contact and non-contact forces.
magnetic force
Give an example of the following uses of a machine:
to change the direction of force
A meter scale is provided at 10 cm mark and is balanced by suspending 400 g from 0 cm mark (fig.). Calculate the mass of meter scale.
State the units of moment of force.
Write the expression for calculating the moment of force about a given point.
Two unlike forces (parallel) of 10 N and 25 N act at a distance of 12 cm. from each other. Find the point about which the body balance.
Calculate the magnitude of the force of a couple, when the arm of the couple is 63 cm and the moment of the couple is 21 Nm.
Calculate the length of arm of couple, if a force of 13 N produces a moment of couple of 14.3 Nm.
Clockwise moment produced by a force about a fulcrum is considered to be ______.
