Its becuase weight and mass are different. Even if an object weighs more than another object it might not have more mass than the other object.
Efficiency = (output energy) divided by (input energy) .
It's always less than 1 .
Also, it's commonly expressed as a percent. To get the percent,
just multiply the number by 100.
Normal force=m*g*cos theta
normal force=92kg*9.8m/s^2*cos 42
normal force=670 N
