Presentation on theme: "Thursday, 1/16/14 1. Turn to pg. 46 in spiral 2"— Presentation transcript:
1 Thursday, 1/16/14 1. Turn to pg. 46 in spiral 2 Thursday, 1/16/14 1.Turn to pg. 46 in spiral 2. Title it Simple Machines 3. Sit quietly
2 What is a Simple Machine? A simple machine is a machine that has few or no moving parts.Simple machines make work easier by changing the direction or amount of force needed to do work.Write the 6 examples
3 Wheels and Axles The wheel and axle are a simple machine The axle is a rod that goes through the wheel which allows the wheel to turnGears are a form of wheels and axles
4 Pulleys Pulleys are wheels and axles with a groove around the outside A pulley needs a rope, chain or belt around the groove to make it do work3 types of pulleys:FixedMovablePulley systems
5 Fixed Pulley A fixed pulley is attached to a structure. It allows a change in direction of the input force
6 Movable Pulley Attached to the object you are trying to move It multiplies your force
7 Pulley System Combine a fixed and movable pulley Increases mechanical advantage
8 Pulley examples Can you think of any other examples? Clothesline pulleyWindow blinds pulleyCan you think of any other examples?Flagpole pulley
9 Inclined Planes Can you think of any other examples? An inclined plane is a flat surface that is higher on one endInclined planes make the work of moving things easierA sloping surface, such as a ramp. An inclined plane can be used to alter the effort and distance involved in doing work, such as lifting loads. The trade-off is that an object must be moved a longer distance than if it was lifted straight up, but less force is needed. You can use this machine to move an object to a lower or higher place. Inclined planes make the work of moving things easier. You would need less energy and force to move objects with an inclined plane. Can you think of any other examples?
11 Wedges Two inclined planes joined back to back. Wedges are used to split things.
12 ScrewsA screw is an inclined plane wrapped around a shaft or cylinder.The inclined plane allows the screw to move itself when rotated.
13 Levers-First ClassIn a first class lever the fulcrum is in the middle and the load and effort is on either sideThink of a see-saw
14 Levers-Second ClassIn a second class lever the fulcrum is at the end, with the load in the middleThink of a wheelbarrow
15 Levers-Third ClassIn a third class lever the fulcrum is again at the end, but the effort is in the middleThink of a pair of tweezers
16 Simple MachinesSimple Machines can be put together in different ways to make complex machinery
17 PULLEY INCLINED PLANE Foldable Directions Front Inside Back Definition of PulleyList the 3 different types of pulleysSIMPLE MACHINES3 Examples of Pulley with picturesPULLEYWhat are theyWhy we use themList the 6 simple machines3 Examples of Incline Planes with picturesDefinition of Inclined PlaneINCLINED PLANE