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Simple Machines Physics Mrs. Coyle
What are some simple machines? Lever Incline Plane Pulley
Simple Machines Multiply the effort force (allows you to use a smaller effort force to raise a heavier object). Change the direction of the force. Do not reduce the work input.
Archimedes: ”GIVE ME A PLACE TO STAND AND I WILL MOVE THE EARTH” http://www.math.nyu.edu/~crorres/Archimedes/Lever/leverBigCorners.gif
Mechanical Advantage MA= Output Force(Weight of Object) Input Force (Effort) MA shows how much you are multiplying your effort force.
What is the trade off? What happens to the effort distance, when a machine multiplies the effort force? Answer: Effort distance increases
Ideal Mechanical Advantage IMA= Effort Distance (d in ) Output Distance (d out ) IMA is equal to MA in the absence of friction (ideal case).
IMA for a Lever IMA= Effort Distance = Effort Arm Output Distance Load Arm
Problem What is the ideal mechanical advantage of the lever shown? IMA=3 Fulcrum Load Effort
Lever http://www.walter- fendt.de/ph11e/lever.htmhttp://www.walter- fendt.de/ph11e/lever.htm
Types of Levers Type1 Type 2 Type 3
http://www.edinformatics.com/math_science/simple_machines/Inclined_plane.gif d IN d OUT
Problem: Which has a greater IMA? A B
Problem: Find the IMA. 10m 5m
Single Fixed Pulley Ideally: W in =W out F in d in = F out d out IMA= d in /d out =1
Single Moveable Pulley IMA= 2
Combination of Fixed and Moveable Pulleys IMA= 2
IMA for Pulleys The IMA of pulleys can quickly be found by counting the number of lifting strands.
Question What is the IMA of the following pulleys?
Efficiency Efficiency indicates the percentage of the input work that was converted to useful work and not lost to friction. % eff = (W out / W in ) x 100 % % eff = (MA / IMA) x 100 %
Machines. Simple Machines Work out is less than or equal to Work in. Force out can be greater than Force in.
Mechanical advantage, Efficiency and WO WI
What is mechanical advantage? The force you apply to a machine is called the effort force (input force) The force that the machine applies is the resistance.
Chapter 5 Math Review. Work Conservation of Energy can never get more work out than you put in trade-off between force and distance W in = W out F e.
Pay attention. Simple Machines Simple machines assist us in doing work by creating a mechanical advantage. They do not change the amount of work; they.
Simple Machines LeversPulleys Inclined Plane Simple Machines Can multiply or change the direction of an applied force.
Who can lift me with 1 hand?. Simple machines help make a job easier by: Changing how much FORCE is NEEDED or the Direction of the Force Archimedes once.
Machines, Mechanical Advantage, and Efficiency. Ideal Machines In an ideal machine, work going in is equal to the work going out, this means it has 100%
Mechanical Advantage The measurement of how useful a machine is to the job.
SIMPLE MACHINES Chapter 5 Notes. Machine A device that helps make work easier Changes the size or direction of the force Simple Machine – A type of machine.
Simple Machines Machines Lever Inclined plane Pulley Screw Wedge Wheel & axle.
Machines and Mechanical Advantage Archimedes (Greek mathematician, 287 to 212 B.C.) said, “Give me a place to stand and I will move the Earth,” meaning.
Work Chapter 15 Section 4. Objectives Identify 6 simple machines Explain how the machine work Explain the difference between classes of levers Describe.
Simple machine force – distance trade-off: A simple machine does not reduce the amount of Work you do. A simple machine makes work easier by allowing you.
Machine- a device that makes work easier by changing the direction or size of the force.
Machine Review. Inclined Plane Effort Force Load Distance Load Force Effort Distance.
Calculating Mechanical Advantage Inclined Plane, Pulley, Lever.
What is a Machine? Definition: any device that makes work easier by changing a force Work is done whenever a force moves an object over a distance.
Work, Machines, and Energy. Work and Power Work is done if (1) an object moves, and (2) if a force acts in the same direction that the object moves.
Simple Machines A device created to make work easier.
Machines Machines: make work easier by changing the size or direction of a force (they do not save work) If they did what law would this violate? A simple.
Work Work happens when a force moves an object over a distance. The formula for work is: W = F X D If the object does not move, NO work is done!
II. The Simple Machines (p )
Mechanical Advantage of the 6 Simple Machines. Content Objectives SWBAT calculate mechanical advantage for the six simple machines. Language Objectives.
Work & Simple Machines. A.W ork – occurs when a force causes an object to move in the direction of the applied force 1. Work involves motion, not just.
Work The product of the force and distance when a force is used to move an object.
© Mark E. Damon - All Rights Reserved Vocabulary Types of Simple Machines Using Simple Machines How Simple Machines Work Simple Machines Hodge- Podge.
Chapter 12 Lesson 2: Simple Machines. Types of Simple Machines AA simple machine is a machine that does work with only one movement of the machine.
Mechanical Advantage How much does an inclined plane, screw, wedge, pulley or lever really help you?
Simple Machines Spring Simple Machines Inclined Plane A plane is a flat surface. When that plane is inclined, or slanted, it can help you move.
MACHINES and EFFICIENCY Chapter Key Terms Work = Force x distance Simple machine ◦ a device used to multiply forces or change the direction of.
Mechanical Advantage & Efficiency. advantage of machines machines help us do tasks; they give us an advantage example: a lever can be used to lift.
Making WORK easier!. Types of Simple Machines Lever ScrewWedge Inclined Plane Pulley Wheel and axle.
Chapter 5: Machines II. The Simple Machines II. The Simple Machines Lever Pulley Wheel & Axle Inclined Plane Screw Wedge.
Have few or no moving parts Make work easier Can be combined to create complex machines Six simple machines: Lever, Inclined Plane, Wheel and.
Simple Machines. A machine is a device that makes doing work easier. Machines increase the force applied to an object. Ways to make work easier: Increase.
Classification of simple machines: Simple machines are divided into two families: 1)The Lever family and 2) The inclined plane family The Lever family.
Classes of Levers: More Practice. 3 rd class lever.
Machines Section 10.2 Physics. Objectives Demonstrate knowledge of why simple machines are useful. Communicate an understanding of mechanical advantage.
Objectives Demonstrate a knowledge of the usefulness of simple machines. Differentiate between ideal and real machines in terms of efficiency. Analyze.
Work and Machines Chapter 5. What machines do you use in your life to help you do some type of work?
Chapter 11 work and machines. Anytime that you exert a force and cause an object to move in the direction of the applied force you do _________. work.
Chapter Work in Mechanical Systems Principles of Technology I Edinburg North High School.
Simple Machines Device that makes doing work easier is a machine Machines increase applied force and/or change direction of applied force to make work.
Mechanical Advantage What do simple machines do for us anyway?
Simple Machines. The Six Simple Machines Device that changes the magnitude or distance of a single applied force. Lever Wheel and Axle Pulley.
Work & Simple Machines Review. Define / Describe WORK.
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