Question

In a falling body, give an example of an action-reaction pair of forces.

well i guess, the air resistance and force of gravity acting on the body right??

Answer 1

@wolfe8 @agent0smith

Answer 2

No, these two forces are not an action-reaction pair.

Answer 3

no? O.o
then which pair of forces is related to action-reaction force acting on a falling body?

Answer 4

the object pushes the air down , while the air pushes the object back...isn't it?

Answer 5

This one is correct.

Answer 6

oh, maybe i should choose my words wisely ^.^
thanks !!

Answer 7

If you went with the force of gravity pulling the object down, the reaction is the object pulling back up on the earth with an equal gravitational force.

Answer 8

can i still say that even the object is still falling or it only applies when the object is in contact with the ground?
@agent0smith

Answer 9

It applies AALLWWAAYYSS

Answer 10

When it's in contact with the ground, is gravity not acting on it? It applies anywhere in the universe - earth's gravitational field knows no bounds.

Answer 11

Newton's third law applies equally for contact forces and non-contact forces.

Answer 12

what i mean is the object will still have a reaction force with the force of gravity when it is still in the air? O.o

-sorry i think my mind is thinking differently O.O

Answer 13

Yes, three times yes!
The Earth pulls on the Moon and the Moons pulls equally on the Earth.

In your example, the only difference between "touching" and "not touching" lies not in the existence of the pair of forces, but in their intensity. Of course, the forces will be greater on impact, than they are during the fall.

Answer 14

aahh, i see..
wow thanks a lot, i learned additional info today ! (^_^)

Answer 15

Gravity acts between any two objects, and each one feels the same force pulling it towards the other. eg. the earth feels the same gravitational force as the falling object does.

Answer 16

one more question :)
the gravitational pull depends on the masses of the objects and their distance to each other right? or there's something else?

Answer 17

That's it, directly proportional to the product of the masses, and inversely proportional to the square of the distance

Answer 18

oh okay ^_^