Work and Energy — Science STD 9 — Question

Mention the type of energy used in the following examples.
(i) Stretched rubber string.
(ii) Fast-moving car.
(iii) The whistling of a cooker due to steam.
(iv) A fan running on electricity.
(v) Drawing out pieces of iron from garbage, using a magnet.
(vi) Breaking of a glass window pane because of a loud noise.
(vii) The drackers exploded in Diwali.

What kind of force keeps the body at rest?

Find whether work is positive, negative or zero: Person pushing a car in the forward direction.

How are the various substances in day to day use classified from the scientific point of view?

Give the expression for mirror formula.

Why we cannot see our organs like the heart, blood vessels and intestines?

How is excretion in plants useful to human beings?

When is work done said to be zero?

What is Carbon cycle?

Write formula : Electriccurrent