Question

Give one example each in which a force does positive work negative work and zero work

Answer 1

1. Positive work done- Dropping a ball, pushing a book, rolling a ball, pulling a chair 2. Negative work done- Throwing a ball, Applying breaks, Work done by frictional force when we push a table, Work done by buoyant force when an iron nail is sinking 3. Zero work done- When we pusha rigid wall, angle between force and displacement is 90