Brake Pad is for a disc brake (which are the shinny discs you can see through you wheels assuming you don't have hub caps or wheel dust covers).
Brake shoe is for a Drum Brake which looks simialr to...
If you do not expect to stop the vehicle, then yes.Your front brakes provide up to 80% of the stopping power of your braking system. Without them, you would NEVER be able to stop your vehicle in...
Brake Pads are made of metallic material that rub up against the brake rotor that creates friction and that (should) stop your vehicle. Depends on the condition of the rotor and pad.