Question

1.state one way to obtain decrease the moment of force about a given axis of rotation. 2. A balloon collapse when air is removed from it.​

Answer 1

➧ The moment of a force about an axis of rotation is the turning effect of the force about the axis of rotation. It is measured by the product of the force and the perpendicular distance between the axis of rotation and the line of action of the force.

Reduced By:-

• Momentum of force about a fixed point can be reduced by reducing the perpendicular distance from the point of application of force and axis of rotation.

• Momentum of a force can also be reduced by reducing the distance between the force and the turning point.

$\rule{300}{2}$

➧ When there is air in the balloon, it exerts pressure on the wall of the balloon, which is balanced by the atmospheric pressure.

Now, on removing the air from the balloon, the atmospheric pressure becomes greater than the internal pressure, which means that the atmospheric pressure will exert a force on the balloon collapsing it.