Is there anyway to force advance the film on a Nikon F70 camera?

I recently acquired this camera and it was working fine for the first few exposures, however since the fifth snap the camera has insisted that it has reached the end of the film which it has not.

First, never, never, NEVER force anything on any camera. Something has jammed up inside the camera and is preventing the film from being advanced. Its possible that a piece of the film advance take-up spool has broken off and lodged in the film advance mechanism. I suggest rewinding the film, open the back of the camera, remove the film and then look around the film advance side of the camera and see if there's an obstruction. If you have to send it for repairs check with Henry's Camera there in Canada.http://www.henrys.com

Or is it possible that you advanced the film and then forgot to release the shutter? Try that before doing anything else.

Download a copy of the manual of that camera at http://butkus.org.

Stealing from "Edwin" never, never force anything when it comes to cameras. A roll of film is cheap in comparison to having the camera completely disassembled for repair. Never mind the cost of repair if you damage the sprocket advance wheel inside the camera.

Your best best is to push in the rewind button on the bottom of the camera and rewind the film back into the cassette. If that is possible. If you encounter resistance, then you should take the camera to a camera shop who has a changing bag and can unload the camera, hopefully with out ruining your 5 exposures.

AT that time you need to inspect the camera to see if the sprocket wheel advances properly.
When you loaded the camera, did you turn the rewind knob (clock wise) "gently" until you encounter resistance? This takes up the slack in the film cassette.
Then when you advance the film, keep an eye on the rewind knob. The rewind knob should turn counter-clock wise about a half a turn. If the rewind turns when you advance the film, THEN you have loaded the camera properly. In the 38 years I handled film cameras, I ALWAYS use this procedure!