Earth attracts all things towards it through an unseen force of attraction. This force of attraction is called as gravitation or gravitational pull. You must have noticed that every time you throw an object upwards, it reaches to a certain height and then falls on the earth's surface. Students will learn the universal law of gravitation and its importance, free fall, mass, weight, thrust and pressure, Archimedes' principle and relative density. Students will also find numerical problems related to these topics. Often, the term gravity and gravitation are used interchangeably, and this doesn't seem right. However, these two terms are related to each other, but their implications are quite different.