Newton's laws of motion -- Force of gravity on a skydiver

• kara123
In summary, the conversation discusses the calculation of force of gravity, which is equal to mass multiplied by acceleration. The acceleration of gravity is commonly known as 9.8 m/s and in this situation, the mass is 75 kg, resulting in a force of 735 N. The question of whether the force of gravity changes when the person lands is answered as no, as it only changes if the mass changes.

kara123

Homework Statement
A 75 kg skydiver jumps out of an airplane. Calculate the force of gravity acting on him when he jumps and after he has landed. Explain any differences
Relevant Equations
Fnet=ma
I think you would do force of gravity= mass x acceleration

acceleration of gravity= 9.8 m/s
mass 75 kg
75kg x 9.8 m/s
=735 N

i don't know if that's right but i have no idea how to calculate it after he lands, any help would be greatly appreciated!

kara123 said:
i don't know if that's right but i have no idea how to calculate it after he lands
Looks good to me. Question for you: Does the force of gravity change when he lands?

kara123 said:
... i have no idea how to calculate it after he lands, any help would be greatly appreciated!
It's a trick question. Knowing that, take a shot at it.

Doc Al said:
Looks good to me. Question for you: Does the force of gravity change when he lands?
it does not so it would remain the same after he lands then. The force of gravity would only change in this situation if the mass changes?

kara123 said:
it does not so it would remain the same after he lands then. The force of gravity would only change in this situation if the mass changes?
Right! As @russ_watters said, it's kind of a trick question.

russ_watters