Complex machine uses a combination of simple machines i.e. Bicycle. Lab- rulers, levers, move the fulcrum point 2 Machines transfer mechanical energy from one object to another. Change direction or amount of force, or the distance or speed of force to do work. Lab- pulleys systems with the spring balance 1 Friction opposes motion. Reducing friction in machines lubrication and wax.
Students use rating guide to score papers.
Emphasize affect of not following directions i.e. place value.