Friction — Science STD 8 — Question

An inflated balloon was pressed against a wall after it has been rubbed with a piece of synthetic cloth. It was found that the balloon sticks to the wall. What force might be responsible for the attraction between the balloon and the wall?

Whenever we push a very heavy box kept on the ground, it does not move at all because frictional force balances the force that we apply. So, there is no net movement of this box. It acts in a direction opposite to the force we apply.

Define cathode and anode.

State the laws of reflection of light.

By which term, stoppage of menstruation is described ?

Define the force of friction.

What are the effects of overfishing on a pond ecosystem?

Name the phenomenon which enables us to see movies in a cinema hall.

The bulb glows when the electric current passes through it. Explain why?

Explain the importance of observation, questioning, and experimentation in science.