Haldi’s Adventure

^{Free fall of an object and acceleration (g)}

^{→ When an object is thrown upward, it reaches certain height, then it starts falling down towar}

^{earth. It is because the earth’s gravitational force exerts on it.}

^{→ This fall under the influence of earth is called ‘free fall of an object’.}

^{→ During this free fall direction do not change but velocity continuously changes which is calle}

^{acceleration due to gravity. It is denoted by ‘g’.}

^{→ Its unit is same as acceleration m/s .}

 

^{Gravitational Acceleration and its value at the surface of earth}

 

^{→ The uniform acceleration produced in a freely falling object due to the gravitational force of}

^{earth, is called acceleration due to gravity.}

^{→ It is represented by ‘g’ and it always acts towards the centre of the earth.}

Mathematical Expression for g

From the second law of motion, force is the product of mass and acceleration.

F = ma

For free fall, acceleration is replaced by acceleration due to gravity.

Therefore, force becomes:

F = mg ….(i)

But from Universal Law of Grav