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.
RELATED QUESTIONS
Moment of force =............... × distance of force from the point of turning.
In a door, handle is provided ......... from the hinges.
To obtain a given moment of force for turning a body, the force needed can be decreased by
Define force.
How does the effect of force differ when it is applied on a non-rigid body?
State the effect of force F in of the following diagram.
State the condition when the change in the momentum of a body depends only on the change in its velocity.
Name of S.I. unit of the rate of change in momentum.
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.
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.
Classify the following amongst contact and non-contact forces.
electrostatic force
Classify the following amongst contact and non-contact forces.
magnetic force
In a beam balance when the beam is balanced in a horizontal position, it is in ________ equilibrium.
The diagram shows a uniform metre rule weighing 100gf, pivoted at its centre O. Two weights 150gf and 250gf hang from the point A and B respectively of the metre rule such that OA = 40 cm and OB = 20 cm. Calculate :
the difference of anticlockwise and clockwise moment
A couple of 15 N force acts on a rigid body, such that arm of couple is 85 cm. Calculate moment of couple in the SI system.
The diagram shows wheel O pivoted at point A. Three equal forces F1, F2 and F3 act at point B on the wheel.
- Which force will produce maximum moment about A?
- Give a reason for your answer in (a).
A door lock is opened by turning the lever (handle) of length 0.2 m. If the moment of force produced is 1 Nm, then the minimum force required is ______.
A metal rod AB of length 80 cm is balanced at 45 cm from the end A with 100 gf weights suspended from the two ends.
- If this rod is cut at the center, C, then compare the weight of AC to the weight of BC. (Use >, < or =)
- Give a reason for your answer in (a).
