@article {Puri:1996:0031-9120:215,
	author = "Puri A.",
	title = "Newton's laws and conservation of mass",
	journal = "Physics Education",
	volume = "31",
	year = "1996",
	abstract = "<P><I>In an exposition of Newton's second law, F = dp/dt is commonly viewed as the fundamental relation and the equation F = ma as a mere special case when m is constant, it being implied that, when analysing bodies with a variable mass, some fuller machinery contained in F = dp/dt is needed. Paradoxically, one is also likely to be told that the conservation of mass of a body is a presupposition in Newtonian theory, or again, that it is a consequence of his laws. The following note is an attempt at sorting out the mess that ensues: it examines some of the logical interlinks between Newton's laws of motion, mass conservation and the notion of a 'body'.</I></P>",
	pages = "215-217(3)",
	url = "http://www.ingentaconnect.com/content/iop/physed/1996/00000031/00000004/art00018"
}