To which of the following systems is the force of the explosion of a grenade NOT an external force (and so must be an internal force)?

a) A piece of the grenade
b) Any other piece of the grenade
c) The entire grenade
d) None of the above

Question

To which of the following systems is the force of the explosion of a grenade NOT an external force (and so must be an internal force)?

a)	A piece of the grenade
b)	Any other piece of the grenade
c)	The entire grenade
d)	None of the above

anonymous · Answer

@Michele_Laino Do you think you could help me with one more?

michele_laino · Answer

yes!

michele_laino · Answer

I think option c)

anonymous · Answer

so the pieces would not be an external force?

michele_laino · Answer

no, they can be viewed as many particles on which the internal forces, caused by the explosion, are acting on them

anonymous · Answer

oh ok i understand thanks SO much!!!!!

michele_laino · Answer

thank you! :)