A student watches a video about forces. The video shows a piece of wood floating in a tank of water.
Write down the name of the non-contact force acting on the wood
and the name of the contact force acting on the wood. [2 marks]​

Quantum mechanics applies to subatomic, atomic, nanometer-size, and micrometer-size systems. nanometer, micrometer, and kilometer-size systems. atomic, nanometer-size, and micrometer-size systems. subatomic, atomic, and nanometer-size systems.