A crowbar is used to pull a nail. The length of the effort arm of the crowbar is 22 cm and the resistance arm is 4.2 cm. What force in N is required to pull a nail if the friction force holding the nail in place is 120 N

Rank the six combinations of electric charges on the basis of the electric force acting on q1. define forces pointing to the right as positive and forces pointing to the left as negative. rank positive forces as larger than negative forces. q1,q2,q3 = positive(+) q1 = + q2 = + q3 = - q1 = + q2= - q3= + q1= - q2= + q3= + q1= + q2= - q3= - q1,q2,q3 = negative