1. The problem statement, all variables and given/known data How would the free-body diagram of two 45 degree right angle wedges stacked on one another look like? (It is stacked so that the two wedges form a square) There is friction that is holding the wedges together. The wedges are in place and not moving. ___ |\ | | \| ---- 2. Relevant equations 3. The attempt at a solution The wedge on the bottom would have its force due to gravity (weight) pointing directly downwards, and a normal force pointing to the top right. The wedge on the top would have it's force due to gravity (weight) pointing directly downwards, a normal force pointing to the bottom left, and static friction pointing to the top left. Assuming the forces are correct, why the normal force and the weight of the second wedge have y-components that point downwards? Shouldn't there be a force that points upwards to counteract this large y-component force downwards, OR is the y-component of friction so strong that it equals both of the y-component force downwards?