Subject Experts Solutions for Chapter: Force and Pressure, Exercise 1: Check your progress

Define moment of a force. Write its SI unit.

It is easier to open a door by applying the force at its handle than at the hinged end. Why?

Write any two applications of moment of force.

A nut is opened by a spanner of length $30 \mathrm{cm}$. If the applied force is $20 \mathrm{N}$, find the moment of force needed to loosen the nut.

A force of $250 \mathrm{N}$ produces a moment of force of $500 \mathrm{N} \mathrm{m}$. Calculate the moment arm.

Calculate the force which will produce a moment of$60 \mathrm{N} \mathrm{m}$ when the perpendicular distance between the point of application of force and the fixed point is $60 \mathrm{cm}.$