Lakhmir Singh and Manjit Kaur Solutions for Chapter: Simple Machines, Exercise 3: EXERCISES

How simple machines reduce effort?

What is mechanical advantage?

Why is an inclined plane is a simple machine? Give two examples of inclined planes from daily life.

The effort arm of a lever is $4 \mathrm{m}$ long and the load arm is $8 \mathrm{m}$ long. Find the effort required to lift a load of$20 \mathrm{N}$.

An effort force of $20 \mathrm{N}$ is used to lift a load of $60 \mathrm{N}$ by a machine. Calculate the mechanical advantage of the machine.

A lever used to lift a heavy box has an effort arm of 4 meters and a load arm of 0.8 metres. What is the mechanical advantage of the lever?

A rake is held so that its input arm is $0.4$ meters and its output arm is $1.0$ metres. What is the mechanical advantage of the rake?

A child’s toy rake is held so that its output arm is $0.75$ meters. If the mechanical advantage is $0.33$, what is the input arm length?