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A point through which total weight of th...

A point through which total weight of the body always acts vertically downwards whatever may be the position of the body is _________________.

A

centre of mass

B

rigid body

C

centre of gravity

D

geometrical centre

Text Solution

Verified by Experts

The correct Answer is:
C
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Adjoining figure shows a force of 40N acting at 30^(@) to the horizontal on a body of mass 5kg resting on a smooth horizontal surface . Assuming that the acceleration of free-fall is 10ms^(-2) , which of the following statements A,B,C,D,E is ( are ) correct ? (1) The horizontal force acting on the body is 20 N ( 2) The weight of the 5 kg mass acts vertically downwards (3) The net vertical force acting on the body is 30N

The adjoining figure shows a force of 40 N pulling a body of mass 5 kg in a direction 30^(@) above the horizontal . The body is in rest on a smooth horizontal surface. Assuming acceleration of free-fall is 10m//s^(2) . What of the following statements I and II is // are correct ? I. The weight of the 5kg mass acts vertically downwards II. The net vertical force acting on the body is 30N.

Knowledge Check

  • When a block is kept on the table, its weight acts vertically downwards then the force exerted by the surface on the block is

    A
    vertically upwards called normal reaction.
    B
    vertically downwared called normal reaction.
    C
    tangential force acting along the motion .
    D
    tangential force acting opposite to the motion.

  • The point at which total mass of a body is suppose to be concentrated is known as

    A
    deep centre
    B
    centre of gravity
    C
    centre of mass
    D
    geometric contre

  • If a body of mass m is carried by a lift moving with an upward acceleration a , then the forces acting on the body are (i) the reaction R on the floor of the lift upwards (ii) the weight mg of the body acting vertically downwards. The equation of motion will be given by

    A
    `R=mg-ma`
    B
    `R=mg+ma`
    C
    `R=ma-mg`
    D
    `R=mgxxma`

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    Total angular momentum of a rotating body remains constant, if the net torque acting on the body is

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