Draw a diagram of a lever which is always used as a force multiplier. How is the effort arm related to the load arm in such a lever ?

Class-two levers are called force multipliers.

Name the mirror which always produces an erect and virtual image. How is the size of image related to the size of object?

If the effort arm is 1 m and the load arm is 150 cm long, find the MA.

Calculate the ideal mechanical advantage of a lever in which the effort arm is 60 cm and the load arm is 4 cm.

Draw a neat diagram to show how bimetallic strip is used in a fire alarm system.

State the kind of lever which always has mechanical advantage less than 1. Draw a labelled diagram of such a lever.

The class of lever in which the load is located between the fulcrum and the effort

Label the load arm and effort arm in the figure.

A lever of length 9 cm has its load arm 5 cm long and the effort arm is 9 cm long. (a) to which class does it belong ? (b) Draw a diagram of the lever showing the position of the fulcrum F and directions of both the load L and effort E. (c) what is the mechanical advantage and velocity ratio if the efficiency is 100%? (d) What will be the mechanical advantage and velocity ratio if the efficiency becomes 50%?

Draw a labelled diagram of a class II lever. Give one example of such a lever.