1. A pair of brothers have a 20kg, 3.5m plank they want to use as a lever. They use a fulcrum which is 0.75m from the load mass. If they push down one end of the lever with a force of 210N, then they can move the Load mass away. What is the upward force exerted on the large mass? If the mechanical advantage is defined as a ratio of resistance force compared to the effort force, how much mechanical advantage is gained by the lever? 2. Relevant equations Fede= FLdL 3. I used the 210N as the Fe, and 2.75 as the de set equal to FL multiplied by 0.75 for dL Then I solve for the FL. I'm not sure if the answer I get is the upward force, though I would assume it is....As for the second question, I have no idea where to begin on that. Thanks!