1. The problem statement, all variables and given/known data I need to explain why I can't lift myself by pulling my shoes' laces. 2. Relevant equations Newton's third law 3. The attempt at a solution My explanation is that by pulling on your laces, there is always going to be a force that goes against your force, so this is why you can't pull yourself up. (So we're using NEwton's third as an explanation) Is this correct ?