Machines and Simple Machines

Explain about different types of simple machines, its uses in detail.

Discuss at least five uses of simple machines in our everyday life.

Look at the two pictures given below. Identify the image in which more energy has been used. Discuss.

Picture A	Picture B

What is the formula for the efficiency of a machine?

The effort arm of a lever is $5 \mathrm{m}$ long and the load arm is $6 \mathrm{m}$ long. Find the effort required to lift a load of $20 \mathrm{N}$ in newton.

A pair of tongs is an example of lever of _____ type.

A machine cannot be _____ per cent efficient.

The _____ of a machine is the ratio of useful output work to input work.

In a certain machine, an effort force of $10 \mathrm{N}$ is used to lift a load of $40 \mathrm{N}$. Calculate the mechanical advantage of the machine.

The effort arm of a lever is $60 \mathrm{m}$ and the load arm is $6 \mathrm{m}$, Calculate the effort force required to lift a load of $200 \mathrm{N}$ in newton.

The effort arm of a lever is $4 \mathrm{m}$ long and the load arm is $6 \mathrm{m}$ long. Find the effort required to lift a load of $10 \mathrm{N}$ in newton.

A load of $500 \mathrm{N}$ can be lifted by a force of $50 \mathrm{N}$ with the help of a lever. Find the mechanical advantage?

A sewing machine is an example of simple machine.

In a lever of type three, the effort is in between the fulcrum and the load.

A load of $400 \mathrm{N}$ can be lifted by a force of $40 \mathrm{N}$ with the help of a lever. Find the mechanical advantage?

A _____ is used to lift and carry heavy objects like vehicles from the ground.

A machine having $100 \%$  efficiency is known as _____ machine.

A crowbar helps you to shift a heavy load faster.

The effort arm of a lever is $50 \mathrm{m}$ and the load arm is $5 \mathrm{m}$, Calculate the effort force required to lift a load of $200 \mathrm{N}$ in newton.

The effort arm of a lever is $2 \mathrm{m}$ long and the load arm is $4 \mathrm{m}$ long. Find the effort required to lift a load of $10 \mathrm{N}$ in newton.