Alright so f=ma I know the difference between mass and weight so that's alright. Now I'm heavy (96Kg); If I'm moving forwards at a rate of one metre per second (with the passing of every second I move forward exactly one metre) then is 'a' equal to one? This confuses me in that I'm not accelerating. The rate of change of my velocity is zero - is it not? My velocity is constant. Or is that the same as saying my rate of acceleration is one? f=ma so the force required to cause me to move forwards one metre per second per second is 96N Correct? Work done is equal to force multiplied by distance and power (rate of working) in Watts is work multiplied by time. So If I move myself forwards one metre in the time frame of one second does that mean that the power required to do so was 96W? Or is that I weigh 96Kg with earth's gravitational constant of 9.81 in place therefore my mass is 96/9.81 = 9.89Kg. Surely that can't be right can it?