please do it fast

Dear student,
I.
while walking we apply force on the ground, and on return, ground provides a force on the foot due to that force we are able to walk.
ii.
In the tug of war when two teams pull equally hard, the rope does not move in any direction a the net force acting on the war =0
iii.
When two forces act in the same direction, then net force is equal to the sum of two forces. For example, let F1 and F2 are two forces acting in the same direction, then the net force =(F1 +F2 )
IV.
Yes, the gravitational force acts on dust particles too. But as the air is always in motion, thus it becomes impossible for dust particles to settle down in the ground.

Regards

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