Work Power Simple Machines Energy. Work Work is done on an object when the object moves in the same...
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Transcript of Work Power Simple Machines Energy. Work Work is done on an object when the object moves in the same...
![Page 1: Work Power Simple Machines Energy. Work Work is done on an object when the object moves in the same direction in which the force is exerted. Formula:](https://reader035.fdocuments.in/reader035/viewer/2022062409/5697bf791a28abf838c82615/html5/thumbnails/1.jpg)
WorkPower
Simple MachinesEnergy
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WorkWork is done on an object when the object moves in the same direction in which the force is exerted.
Formula: Work = Force x Distance
Units:Work is measured in Joules (J)Force is measured in Newtons (N)Distance is measured in meters (m)
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PowerPower is the rate of transfer of energy or the
rate at which work gets done.
Power = Work / Time
Power = Watts (W)
Work = Joule (J)
Time = seconds (s)
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PulleyA pulley is a simple machine made of a grooved
wheel with a rope or cable wrapped around it.
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Types of PulleysSingle Fixed Pulley:
attached to the structure, like a flag pole
Does not change the amount of force applied
Does change direction of the force
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Types of PulleysSingle Movable Pulley:
this pulley is attached to an object you wish to move
Decreases the amount
of input force neededDoes not change the
direction of the force.
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Types of PulleysBlock and Tackle:
combination of fixed and moveable pulleys
Decreases input force even more than a moveable pulley
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Mechanical AdvantageMA = Output force / Input force
MA also equals the number of sections of ropethat support the pulley
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Inclined PlaneAn inclined plane is a flat, sloped surface.
An inclined plane allows you to exert your input force over a longer distance
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Ideal Mechanical Advantage
MA = Length of the incline divided by the height of the incline .
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LeversA lever is a rigid bar that is free to pivot, or
rotate, at a fixed pointThe fixed points that a lever pivots on is called a
fulcrum
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Ideal Mechanical Advantage
MA = Distance from fulcrum to input force ÷ Distance from fulcrum to output force
Input Force
Output Force
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Types of LeversLevers are classified according to the location of
the fulcrum relative to the input and output forces
1st Class 2nd Class 3rd Class
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Examples of Levers Third Class
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Three Other Simple Machines
Wheel and Axle – a machine consisting of a wheel that turns an axle so that the two parts rotate together.
Wedge – a machine with at least one slanting side ending in a sharp edge.
Screw – a machine that contains an inclined plane wrapped around a post.
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Compound MachinesA machine that is made of two or more simple
machines.
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EnergyEnergy is the ability to do work or cause change.
Kinetic energy is the energy an object has due to its motion. Formula: KE = ½ mv2
Ex: a ball dropped off of a ledge, a bike going up a hill and down a hill
Potential energy is stored energy that results from the position or shape of an object.Ex: holding a ball at the top of a ledge, a bike at the top of the hill
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Gravitational Potential Energy
(GPE) is the energy related to an objects height. The higher an object is raised the more GPE.
Formula: GPE = Weight (N) x Height (m)
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Elastic Potential EnergyElastic potential energy is the energy associated
with objects that can be stretched or compressed.
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Analyze this Coaster