Let w_1 = weight 1 Let w_2 = weight 2 Let d_1 = distance 1 Let d_2 = distance 2 I understand the equation for all lever problems to be (w_1)(d_1) = (w_2)(d_2). 1. John weighs 90 lbs and Jane weighs 60 lbs. They are both seating on a seesaw. If John is seated 10 feet away from Jane, how far should each be from the fulcrum of the seesaw? I will use f for fulcrum. John...........f..............Jane Distance from John to f = x. Distance from Jane to f = 10 - x Equation 90x = 60(10 - x) Yes? 2. John wants to move a 400 lb. rock with a 5 ft. 9 in. crowbar. He puts the fulcrum 9 inches from the rock. How much force must he use to move the rock? Let 5 feet, 9 inches be 70.8 inches. Rock...........f...........x Let x = amount of force needed. Distance from Rock to f = 9. Distance from John to f = 70.8. Equation 9(400) = 70.8x Yes?