An inclined plane makes an angle of $20°$ with horizontal. What is its mechanical advantage? If a man can put maximum effort of $40 \mathrm{kgf}$, what minimum load he can push on this plane?$(\sin 20°=0.34)$.

The given figures given below show two inclined planes $A$ and $B$ respectively. Plane $A$ is steeper than plane $B$. Mechanical advantage of which plane is more and how much?

Draw diagrams to show the positions load, fulcrum and effort in each of the following:

(i) A claw hammer

(ii) Physical balance

(iii) A nutcracker

(iv) A knife 

(v) A wheelbarrow

The figure below shows a human hand. Mark the positions of load, effort and fulcrum in the diagram. Name the type of lever hand.

The figure below show a human foot. Mark the positions of load, effort and fulcrum in the foot. Name the type of lever foot.

The figure below shows a uniform meter scale in equilibrium position. State with reason if the weight of the scale is more than, equal to or less than the weight of mass $\mathrm{M}$.