Hello! my first post here This is more of a conceptual question. Assume normal friction in this type of situation, when pulling on the specific pedal (shown in pic) what happens to the tricycle (move backwards, forwards?) Also assume the steering is locked. What are 4 concepts in physics that explain this? We were having a discussion about this in class and no one agreed, so now it's homework.... I believe given friction under these circumstances it should roll back. As for the 4 concepts in physics, my ideas so far are 1.) torque 2.) angular momentum. Any more then id be guessing. thanks!