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5.3 Simple Machines
Lever A bar that is free to pivot about a fixed point (fulcrum): the fixed point : distance from the fulcrum to where the effort force is applied. : distance from the fulcrum to where the resistance force is applied
3 Classes of Levers
First Class Lever Used to , always changes the of the applied force.Ex. Screwdriver used to pry paint can lid Fulcrum is in the
Second Class Lever Always – does not change direction of force.Ex. Wheelbarrow Resistance is located between the
Third Class Lever Increases the over which the resistance force is applied. (Does not multiply force) Ex. Baseball bat or hockey stick Effort force is
Mechanical Advantage Lever IMA = length of effort armlength of resistance arm Making the effort arm increases the IMA.
Pulley Fixed Pulley: modified first class lever Moveable Pulley:Attached to ceiling or wall Changes Moveable Pulley: Multiplies IMA = Distance you pull is the resistance distance
Pulley (cont.) Block and Tackle System of IMA =
Wheel and Axle Machine with that rotate together (gears)Ex. Door knob IMA = radius of wheel radius of axle Can be increased by making the
Inclined Planes Sloping surface Reduces the IMA = length height*the the ramp the less force required
Screw Inclined plane wrapped around a cylinder.The closer together the threads, the easier to screw into wood
Wedge Inclined plane with one or two sloping sides Changes the
Compound Machine Two or more simple machines used together.Ex. Can opener Car
MACHINES Devices that make work easier by changing the size and/or the direction of the force. They will not do work for you.
Simple Machines Chapter 6.
PROCEDURES What is this for? Can you do this instead?
Chapter 5 Lesson 3.
Warm Up 1. What simple machine is a ladder?
Bell ringer If the input force is bigger than the output force, then the input distance is __________ than the output distance. If the output force is.
Types of Simple Machines
Chapter 5 Work and Machines
Simple Machines Outline Notes
Simple machines and mechanisms Lesson 5.0 and 5.1 Pages
Simple Machines Chapter 12 Section 3.
Machines. Work and Power Power is the rate at which work is done Power = Work time Remember that W = Fd So, Power = Fd t Power is measured in Watts –1.
Simple Machines The six types of simple machines are:
-a machine that does work with one movement
Simple Machines & Mechanical Advantage RHS Technology Education.
Chapter 5: Work and Machines. Describe the six types of simple machines. Explain how the different types of simple machines make work easier. Calculate.
Chapter 14 Section 3.
Work and Machines Chapter 5 Sec 2. What is a Machine? Any device that makes work easier.
Section 2 Simple Machines.
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