WORK DONE = FORCE X DISTANCE
A 5 NEWTON FORCE ALONG 10 m = 50J
if the work is done on a slope IT IS STILL THE SAME!!
A FORCE A 90degrees TO THE DIRECTION OF MOTION DOES NO WORK!
WORK DONE AT AN ANGLE IS = FORCE X COSq X DISTANCE
DONT FORGET ITS MEASURED IN JOULES=
power is the RATE OF WORK
POWER = FORCE X VELOCITY
Efficency is the amount of usful output you get compared to imput. It is a percentage.