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Work, Power and Simple Machines

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.

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Work, Power and Simple Machines

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  1. Work, Power and Simple Machines

  2. 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!!!

  3. Sketch, label, and describe each different method. Challenge: Create three machines to lift the mass in three different ways http://physics.fau.edu/observatory/Images/100gmass.jpg • Use the following materials: • Ruler • Marker • tape http://finepointdesign.com/wp-content/uploads/2011/01/DSC05618_markers_web.jpg http://www.pencils.com/sites/default/files/imagecache/product/Color_Rulers.jpg http://27.media.tumblr.com/tumblr_lhs14t9rhm1qzur0wo1_400.jpg

  4. The Six Simple Machines pulley lever inclined plane http://www.the-office.com/summerlift/pulleybasics.htm http://cnx.org/content/m23853/latest/ http://www.schnauzerlover.com/ramp.htm wheel & axle screw wedge http://www.g9toengineering.com/resources/simplemachines.htm http://makeitgo.wikispaces.com/wedges http://en.wikipedia.org/wiki/Ferris_wheel

  5. Some machine basics… Input What goes in… http://tech.texasdi.org/simplemachines http://elimeirkaplan.com/blog/?p=608 • Output is also called “resistance:” • Resistance forceis the force exerted by a machine • Resistance distance is the distance across which the machine applies effort • Input is also called “effort:” • Effort forceis the force applied to a machine • Effort distance is the distance across which the effort is applied output What comes out…

  6. Levers LOAD The mass being lifted by a lever EFFORT Force used to lift the load FULCRUM Fixed point about which the lever rotates Review: Force is a push or a pull on an object, and is measured in Newtons

  7. 1st Class Lever RESISTANCE DISTANCE… EFFORT DISTANCE… FULCRUM… is between the effort and the load

  8. Your experiment… Explore the relationship between effort force required to lift a load, and the length of the resistance distance. • Use the following materials: • Ruler • Marker • Tape • Spring Scale • 100-g mass Resistance Force = ____ N

  9. Your experiment… Data Collection: - repeat for 3 trials at this fulcrum position for consistency - average the effort needed for this fulcrum position Data Table 1: Effort force measurements for fulcrum positioned at ____ cm

  10. Mechanical Advantage Number of times the input is increased by a machine Ideal Mechanical Advantage The mechanical advantage in a “perfect” world; predicted mechanical advantage Actual Mechanical Advantage The real mechanical advantage that results when the machine is in use

  11. Summarize your findings 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?

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