Transcript Slide 1
© Kara Lee • In order to help people do work by changing the amount of force needed, we use what are called simple machines. • A simple machine changes a force and lets people use less force to move things. © Kara Lee Simple machines allow us to use less force by doing the following: 1. Changing the direction of the force 2. Making the distance the force is used longer. © Kara Lee The 6 simple machines we will learn about included… Inclined plane Lever Wedge Wheel & Axle Pulley © Kara Lee Screw • Made up of a slanted surface • Makes work easier by making the distance that force is being used longer • Rather than lifting a heavy box up into the back of a truck, if you slide it up the ramp (over a longer distance), you use less force. • Example: ramp, stairs, slide © Kara Lee © Kara Lee • Made up of 2 inclined planes put together to make a V shaped object. • Wedges change the direction of the force by making the force go outward instead of downward. • It helps split or cut objects apart. • Examples: knives, axes, chisel © Kara Lee © Kara Lee • Made up of an inclined plane that is wrapped around a post. • Screws change the direction of the force by making a turning force that is weak stronger by making it a downward force. • The force is spread out over numerous turns of a screw. • Examples: screw, jar lid © Kara Lee © Kara Lee • Made up of an stiff or straight bar that moves around a fixed point •The fixed point is called the fulcrum. • Fulcrums are usually placed at one end of the lever to make that end longer than the other end. • Examples: seesaws, can openers © Kara Lee © Kara Lee • Made up of an axis that 2 cylinders turn on •Small force must be used to move the small cylinder which in turn moves the axle using a large force • Examples: faucet, car wheels © Kara Lee © Kara Lee • Made up of a stationary or fixed wheel and a rope that is fitted around it • Pulleys either change the direction of a force or the force that is used on them increases • When you pull downward on one end of the rope, the wheel turns which makes the rope change direction (downward pull rope goes upward) • Examples: flag pole, elevator, window blinds © Kara Lee © Kara Lee Terms of Use Thank you for downloading my Simple Machines PowerPoint. I hope that you enjoy using it as a valuable resource in your classroom! Please let me know if you have any questions or concerns. My email is [email protected]. ©Kara Lee 2015 This resource entitles you to single classroom use only. Please do not share with grade level teams or district wide or post/resell any part of this resource. If you would like to share this resource with others, please purchase multiple licenses. I’d love to hear your feedback! www.teacherspayteachers.com/Store/Teachers-Gone-Wild Fonts and Clipart Credit Fonts: Clipart: Backgrounds: