Question

do you get hurt in kicking a football floating in free space?

Answer 1

Yes, we will get hurt in kicking a football in free space because ​whenwe kick a football i.e. accelerate it, there will be a force given by F = ma where m is the mass and a is the instantaneous acceleration. and F=ma is not equal to zero. Thus due to this force we will get hurt.

Answer 2

No it will not hurt, infact we hit a truck we don't feel any effect..

because their is not any opposing Force