Simple Machines What are simple machines? Simple machines transfer force Can you list some found in your home? _ _ What is an inclined plane? An inclined plane is a flat surface that slopes (a ramp) or is a What is the purpose of an inclined plane? It takes LESS FORCE to move an object up an inclined plane but the object must be MOVED A GREATER DISTANCE Look and discuss the diagram to the right An inclined plane makes it easier to work because it spreads the needed to push or pull an object over a longer What unit of measurement would be used to describe the amount of work needed to pull the wooden block up the inclined plane? How does the height of an inclined plane affect the force needed to move an object? What kind of simple machine is a ramp? Simple Machines What is a pulley? A pulley is a wheel with a rope (or chain) wrapped around it Parts of a Pulley What is the purpose of a pulley? Pulleys let you move loads up, down or sideways by MAKING WORK EASIER BECAUSE IT CHANGES THE DIRECTION OF THE FORCE!!! How does a movable pulley reduce the amount of force needed to lift an object? A movable pulley is attached to the load As the rope moves the _ Pulley pulley and the load BOTH move Work is made easier by LESS FORCE needed to move the load than a fixed pulley BUT you have to use more rope! How does a fixed pulley make it easier to lift heavy objects? A fixed pulley does not move; it changes the DIRECTION OF THE FORCE but does NOT reduce the amount of force needed to lift the load In order to lift the weight with the pulley, the free end of the rope must be pulled (direction) with a force of more than 100 N _ Pulley http://wokaflokaflame.glogster.com/pully/ ... wrapped around it Parts of a Pulley What is the purpose of a pulley? Pulleys let you move loads up, down or sideways by MAKING WORK EASIER BECAUSE IT CHANGES THE DIRECTION OF THE FORCE!!! How does... Pulley pulley and the load BOTH move Work is made easier by LESS FORCE needed to move the load than a fixed pulley BUT you have to use more rope! How does a fixed pulley make it easier to lift