Making a hypothesis 1 ) Newton's Laws assert that if a particle is in equilibrium then the total force on it must vanish, i.e. the vector sum of the applied forces must be equal to zero. It is quite possible however that your experiment will show that the forces don't quite add up to zero. What is your hypothesis for why this might be the case? 2) What do you predict will be the hardest measurements to make for this experiment? Why