Advertisements
Advertisements
Question
Define the moment of force.
Solution 1
Moment of force — The turning effect of force acting on a body about an axis is called the moment of force.
Solution 2
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.
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?
To obtain a given moment of force for turning a body, the force needed can be decreased by
The steering wheel of a vehicle is of large diameter.
What are non-contact forces? Give two example
A body X of mass 5 kg is moving with velocity 20 m s-2 while another body Y of mass 20 kg is moving with velocity 5 m S-1. Compare the momentum of the two bodies.
Calculate the acceleration produced in a body of mass 50 g when acted upon by a force of 20 N.
A car of mass 600 kg is moving with a speed of 10 ms-1 while a scooter of mass 80 kg us moving with a speed of 50 ms-1. Compare their momentum.
A nut is opened by a wrench of length 10 cm. if the least force required is 5.0 N. find the moment of force needed to turn the nut.
A wheel of diameter 2 m is shown in the figure with the axle at O. A force F = 2 N is applied at B in the direction shown in the figure. Calculate the moment of force about
- the centre O, and
- the point A.
Define couple.
(i) What do you understand by the term couple of forces?
(ii) Calculate the moment of a couple shown in fig.
A jack screw is provided with a long arm. Explain why?
State one factor on which the magnitude of a non-contact force depends. How does the magnitude of a non-contact force change along with distance?
State the units of moment of force.
Write the expression for calculating the moment of force about a given point.
The perpendicular distance between the point of application of force and turning point is 1.75 m when a force of 80 N acts on a rigid body. Calculate the moment of force.
On a see-saw, two children of masses 30 kg and 50 kg are sitting on one side of it at distance 2 m and 2.5 m respectively, from its middle, where should a man of mass 74 kg sit to balance it?