1. The problem statement, all variables and given/known data I have only learned that when i apply a net force on an object, it will have an acceleration. However, when i use a knife to cut an object from what I've learned the object should have no net force as the contact force from the table to the object will be equal to the force from the knife onto the object. So what allows the object to be sliced? 2. Relevant equations F=ma 3. The attempt at a solution I can't think of an answer. The board below shouldn't allow the knife to pass through it. Thanks for the help!