Ok, So, lets say I was to drag a 40kg load in a set distance of 10 meter. I record the time, it was 5 secs. Now I find power, P=work/t. We know work=force x distance. SO my question is, is force just mass of load x acceleration due to gravity? 9.81m/s^2. So P= ((40kg x 9.81) * 10 meters)/5 seconds, so 784 watts or so. Thanks guys. What about force of friction? I guess this question doesn't want me to go that far in yet. Thanks guys.