Advertisements
Advertisements
Question
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.
Advertisements
Solution
Resultant force acting on the body = F - F = 0
moment of forces = 0 i.e no motion of the body
RELATED QUESTIONS
How does the magnitude of this non-contact force on the two bodies depend on the distance of separation between them?
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.
State the S.I. unit of moment of force.
Write an expression for the change in momentum of a body of mass m moving with velocity v if v << c.
Classify the following amongst contact and non-contact forces.
normal reaction force,
Classify the following amongst contact and non-contact forces.
Frictional force
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 total clockwise moment about O

Calculate the minimum distance between point of application of force and axis of rotation of a rigid body, if a force 125 N produces a moment of force of 25.75 Nm.
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 in Fig shows two forces F1 = 5 N and F2 = 3 N acting at points A and B respectively of a rod pivoted at a point O, such that OA = 2 m and OB = 4 m.

Calculate:
- the moment of force F1 about O.
- the moment of force F2 about O.
- total moment of the two forces about O.
