Question

Identify the nature (contact or non-contact) and kind of forces (muscular, gravitational, frictional, magnetic, electric force) involved in the following situations: (i) Revolution of the earth around the sun. (ii) Expansion of lungs during inhalation. (iii) A book lying on the table​

Answer 1

Explanation:

(i) Revolution of the earth around the sun. - it is non-contact and gravitational force

(ii) Expansion of lungs during inhalation. - it is contact and muscular force

(iii) A book lying on the table - it is contact and gravitational force