Tina and her younger brother are playing in the garden. They see the gardener using a few tools. Tina recognises the wheelbarrow that the gardener is using. She also sees the gardener using a big garden scissor. Meanwhile, she sees that her younger brother is running to pick the axe that is lying around. Tina stops him and tells him it's dangerous.

Now, answer the following questions.

(a) Which simple machine is used in a scissor?

(b) Which simple machine is used in a wheelbarrow?

(c) Which simple machine is used in an axe?

(d) Why did Tina call the axe dangerous? Are there any other machines that shouldn't be used without adult's supervision?

Mechanical advantage is the ratio of load lifted by a machine to the effort applied. Every simple machine has a mechanical advantage. The effort and load of some machines are given. Calculate the MA of each machine.

Draw a line graph of the given data. Take effort on X-axis and load on Y-axis.

If you want to increase the MA of a machine, what should be increased or decreased?

Is it possible to balance the load and effort by changing the position of fulcrum?