1. The problem statement, all variables and given/known data In an ideal case of pulling a cart up a ramp where there is no friction should the efficiency be less than that of pulling a cart up a ramp with friction? 2. Relevant equations W=F[tex]\Delta[/tex]Xcos[tex]\theta[/tex] Efficiency=(work output/work input)*100 3. The attempt at a solution I was trying to calculate this for a lab and my efficiency came out to be much less for a friction-less ramp than one with friction. Is this possibly right? What I believe one of my problems was, was determining the effort force. How do you determine the effort force if you only know that there is no acceleration, no friction, the length of the ramp is 1.22 m and the mass of the cart is 0.783 kg?