16-­‐11-­‐18 The Inclined Plane Lesson 16 An inclined plane is a sloping surface on which an object can move. An inclined plane decreases the input force required by increasing the input distance required. The same amount of work is ulKmately done, but it is more spread out, e.g., running 1km in 5min or walking 1km in 15min. The IMA of the Inclined Plane The Screw Simple Machines: (4) The Inclined Plane (5) The Screw (6) The Wedge IMA = length of the ramp / height of the ramp What is the ideal mechanical advantage of a ramp that is 3m long and 50cm high? The Wedge A wedge is also based on an inclined plane. A wedge is an inclined plane that travels through another object. The longer and narrower the wedge, the greater its mechanical advantage. A screw is based on an inclined plane. A screw is an inclined plane wrapped around a rod. This conKnuous inclined plane is called the thread. Just like an inclined plane, the greater the length of the thread, relaKve to its height, the greater the screw’s mechanical advantage. Mechanisms A mechanism is two or more simple machines working together. 1 16-­‐11-­‐18 Your Turn •  Take jot notes from pp139-­‐140 –  Not collected, but complete it to prepare for the unit test •  Use pp131-­‐140 to answer quesKons 1-­‐7 on p143 2