Q.No.83: - Why the direction of acceleration due to gravity ‘g’ is always downward? Explain with example.

Q.No.83: - Why the direction of acceleration due to gravity ‘g’ is always downward? Explain with example.

Ans: - The gravitational acceleration depends upon the change in direction and ∆v is always downward so ‘g’ is always downward.

Example: - Let us take an example, if we through a ball upward straight with velocity 10ms^-1 after some time its velocity will decrease and we take it

8ms^-1 (for simplicity) so it’s Vi = 10ms^-1 and Vf = 8ms^-1 and

                                             ∆v=Vf-Vi

                                             ∆v=8ms^-1 – 10ms^-1

                                             ∆v=–2ms^-1

∆v have –ve sign which is opposite to its motion which means downward now we take the second trip when body starts moving downward at highest point its velocity will be zero ”0” after some time its velocity will increase and we take 2ms^-1 (for simplicity) so its Vi=0 and Vf=2ms^-1 and,

                                              ∆v=Vf-Vi

                                             ∆v=2ms^-1 – 0ms^-1

                                             ∆v=–2ms^-1

 The ∆v is positive which means that gravitational acceleration will be along the direction of motion means again downward direction. Hence, ∆v is always downward so ‘g’ is always downward.