The falling of a body (or object) from a height towards the earth under the gravitational force of earth (with on other force acting on it) is called free fall
Given below are the links of some of the reference books for class 9 science.These books by S.Chand Publications are detailed in their content and are must have books for class 9 students.
You can use above books for extra knowledge and practicing different questions.
Thanks for visiting our website.
DISCLOSURE: THIS PAGE MAY CONTAIN AFFILIATE LINKS, MEANING I GET A COMMISSION IF YOU DECIDE TO MAKE A PURCHASE THROUGH MY LINKS, AT NO COST TO YOU. PLEASE READ MY DISCLOSURE FOR MORE INFO.