work, power and simple machines
DESCRIPTION
Work, Power and Simple Machines. Machines. Make work easier to do by:. Increasing the size of an applied force Changing the direction of an applied force Changing the distance over which a force acts. There will always be a trade-off!!!. Sketch, label, and describe each different method. - PowerPoint PPT PresentationTRANSCRIPT
![Page 1: Work, Power and Simple Machines](https://reader030.vdocuments.us/reader030/viewer/2022020308/56816860550346895ddeadc8/html5/thumbnails/1.jpg)
![Page 2: Work, Power and Simple Machines](https://reader030.vdocuments.us/reader030/viewer/2022020308/56816860550346895ddeadc8/html5/thumbnails/2.jpg)
Make work easier to do by:
• Increasing the size of an applied force• Changing the direction of an applied force• Changing the distance over which a force acts
There will always be a trade-off!!!
![Page 3: Work, Power and Simple Machines](https://reader030.vdocuments.us/reader030/viewer/2022020308/56816860550346895ddeadc8/html5/thumbnails/3.jpg)
Create three machines to lift the mass in three different ways
Use the following materials:•Ruler•Marker•tape
http://www.pencils.com/sites/default/files/imagecache/product/Color_Rulers.jpg
http://finepointdesign.com/wp-content/uploads/2011/01/DSC05618_markers_web.jpg
http://27.media.tumblr.com/tumblr_lhs14t9rhm1qzur0wo1_400.jpg
http://physics.fau.edu/observatory/Images/100gmass.jpg
Sketch, label, and describe eachdifferent method.
![Page 4: Work, Power and Simple Machines](https://reader030.vdocuments.us/reader030/viewer/2022020308/56816860550346895ddeadc8/html5/thumbnails/4.jpg)
http://cnx.org/content/m23853/latest/ http://www.the-office.com/summerlift/pulleybasics.htm
http://www.g9toengineering.com/resources/simplemachines.htm
http://en.wikipedia.org/wiki/Ferris_wheel http://makeitgo.wikispaces.com/wedges
http://www.schnauzerlover.com/ramp.htm
![Page 5: Work, Power and Simple Machines](https://reader030.vdocuments.us/reader030/viewer/2022020308/56816860550346895ddeadc8/html5/thumbnails/5.jpg)
What goes in…
Input is also called “effort:”-Effort force is the force applied to a machine-Effort distance is the distance across which the effort is applied
What comes out…
http://tech.texasdi.org/simplemachines http://elimeirkaplan.com/blog/?p=608
Output is also called “resistance:”-Resistance force is the force exerted by a machine-Resistance distance is the distance across which the machine applies effort
![Page 6: Work, Power and Simple Machines](https://reader030.vdocuments.us/reader030/viewer/2022020308/56816860550346895ddeadc8/html5/thumbnails/6.jpg)
FULCRUM
LOAD
EFFORT
Fixed point about whichthe lever rotates
The mass beinglifted by a lever
Force used tolift the load
Review: Force is a push or a pull on an object, and is measured in Newtons
![Page 7: Work, Power and Simple Machines](https://reader030.vdocuments.us/reader030/viewer/2022020308/56816860550346895ddeadc8/html5/thumbnails/7.jpg)
is between the effort and the loadFULCRUM…
RESISTANCE DISTANCE…EFFORT DISTANCE…
![Page 8: Work, Power and Simple Machines](https://reader030.vdocuments.us/reader030/viewer/2022020308/56816860550346895ddeadc8/html5/thumbnails/8.jpg)
Explore the relationship between effort force required to lift a load, and the length of the resistance distance.
Resistance Force = ____ N
Use the following materials:•Ruler•Marker•Tape•Spring Scale•100-g mass
![Page 9: Work, Power and Simple Machines](https://reader030.vdocuments.us/reader030/viewer/2022020308/56816860550346895ddeadc8/html5/thumbnails/9.jpg)
Data Collection: - repeat for 3 trials at this fulcrum position for consistency - average the effort needed for this fulcrum position
Trial Fulcrum Position (cm) Resistance Distance(cm) Effort Force (N)
1
2
3
Average
Data Table 1: Effort force measurements for fulcrum positioned at ____ cm
![Page 10: Work, Power and Simple Machines](https://reader030.vdocuments.us/reader030/viewer/2022020308/56816860550346895ddeadc8/html5/thumbnails/10.jpg)
Number of times the input is increased by a machine
distance resistancedistanceeffort
R
E
ddIMA
forceEffort force Resistance
E
R
FFAMA
The mechanical advantage in a “perfect” world; predicted mechanical advantage
The real mechanical advantage that results when the machine is in use
![Page 11: Work, Power and Simple Machines](https://reader030.vdocuments.us/reader030/viewer/2022020308/56816860550346895ddeadc8/html5/thumbnails/11.jpg)
What did you determine, through your experiment, about the relationship
between the (length of the) resistance arm and the effort needed to lift the load?