Advertisements
Advertisements
प्रश्न
Define the moment of force.
Advertisements
उत्तर १
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.
उत्तर २
The turning effect of force acting on a body about an axis is called the moment of force.
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
Name the factors affecting the turning effect of a body
A force always produces both the linear and turning motions.
Less force is needed when applied at a farther distance from the pivoted point.
State two effects of a force when applied on a body.
Write the expression for the moment of force about a given axis of rotation.
What do you mean by the clockwise and anti-clockwise moment of force?
A tall building has wide foundations.
Find the moment of force of 20 N about an axis of rotation at distance 0.5 m from the force.
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.
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.
A uniform metre rule of weight 10gf is pivoted at its 0 mark.
What moment of force depresses the rule?
A uniform metre scale can be balanced at the 70.0 cm mark when a mark when a mass 0.05 kg is hung from the 94.0 cm mark
- draw a diagram of the arrangement
- Find the mass of the metre scale
Classify the following amongst contact and non-contact forces.
Frictional force
Give an example of the following uses of a machine:
to change the direction of force
Calculate the resultant moment of forces about O and state its direction in fig.
Fig. 5 shows a uniform meter scale weighing 200 gf. Provided at its centre. Two weights 300 gf and 500 gf are suspended from the ruler as shown in the diagram. Calculate the resultant torque of the ruler and hence calculate the distance from mid-point where a 100 gf should be suspended to balance the meter scale.
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.
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.
