Machine Efficiency Dec. 7, 2015.

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Presentation transcript:

Machine Efficiency Dec. 7, 2015

You will be able to calculate the efficiency of a Machine You will be able to determine whether a machine gives a good work output compared to the work input. Learning Targets

Agenda and Reminders Kinetic/Potential Energy Quiz Go over parts 9-10 of Homework Packet II Efficiency Calculations Homework: Finish review packet and part 7 in hw. Pkt. 3 REMINDERS University of Texas due tonight and a new one opens today Test on Wednesday Agenda and Reminders

Etotal=Ekinetic + Epotential PE=mgh KE=1/2 mv2 Etotal=Ekinetic + Epotential Quiz Formulas

Efficiency Work Output Work Input Efficiency the work done by a simple machine, compound machine, or any type of engine model Work Input work done on a machine equal to the effort force times the distance through which the force is applied Efficiency the ratio of the useful work performed by a machine or in a process to the total energy expended or heat taken in. Efficiency

Efficiency Formula

You do 20J of work while using a hammer You do 20J of work while using a hammer. The hammer does 18J of work on a nail. What is the efficiency of the hammer?

An automobile gasoline engine is able to do 225 J of useful work with each stroke of its pistons. If the engine has an efficiency of 29.0 percent, what is the amount of work that must be done on the pistons in the engine?

A certain solar panel is capable of absorbing 750J of light energy every second, and converting 150J of that energy into electrical energy. How much energy is ‘wasted’ in the form of heat by the solar panel every second? What is the efficiency of this solar panel?

A pulley system operates with 40% efficiency A pulley system operates with 40% efficiency. If the work put in is 200 J, how much useful work is produced?

A crane moved a 200 kg hot tub from the ground to the top of the hotel, 53 m above the ground. If the crane used 200,000 J of energy, how efficient was the crane?