Biomass Briquetting Press Machine Produce Energy Efficient Fuel
Chapter 10 Energy, Work and Simple Machines Energy The ability to produce change in itself or its’...
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Transcript of Chapter 10 Energy, Work and Simple Machines Energy The ability to produce change in itself or its’...
Example 1A 105g hockey puck is sliding across the ice. A player exerts a
4.5N force over a distance of 0.15m. How much work does the player do on the puck? What is the change in the pucks energy?
Example 2A gardener pushes a lawn mower across a 20m lawn. He applies a 250N force to the handle. If the
handle makes a 30º with the ground, how much work is done
to make one pass across the lawn?
Exam
ple
2
x comp:Fx = Fcos30º
Given: d=20mF=250N at 30º
Fx = 250cos30º Fx = 217N
Eq: W = Fxd W = 217N X 20m W = 4340J
Example 2A farmer lifts a 1.0kg bail of hay 2m. On a good day it takes the farmer 0.5s. How much power
does the farmer produce.
Machines
A machine eases the load by changing either the magnitude or the direction of a force as it transmits energy to the task.
Mechanical Advantage
Effort Force ( Fe ) : The force you apply
to the machine.
Resistance Force ( Fr ) :The force exerted by the machine.
Mechanical Advantage
Mechanical Advantage (MA) The number of times the machine
multiplies the effort force.MA = resistance force
effort force
MA = Fr Fe
Mechanical Advantage of a Pulley: The number of ropes supporting the resistance weight.
MA = 1 MA = 2 MA = 3