Why does a piece of chalk squeak if you hold it wrong while pushing it against a blackboard? Why does the angle the chalk makes to the board matter? What determines the pitch of the squeak you hear?
Interactive online physics tuition
Interactive online physics tuition
Why does a piece of chalk squeak if you hold it wrong while pushing it against a blackboard? Why does the angle the chalk makes to the board matter? What determines the pitch of the squeak you hear?
Physics with Keith