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# Force and work notes

## by xmaldonado on Sep 28, 2011

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## Force and work notesPresentation Transcript

• Force & Work NotesTEKS 6.8E investigate how inclined planes and pulleys can be used to change the amount of force to move an objectTEKS 7.7A contrast situations where work is done with different amounts of force to situations where no work is done such as moving a box with a ramp and without a ramp, or standing still
• A force is anypush or pull on an object.
• When a force isexerted thatmoves an objectyou dowork.
• The force mustbe in the samedirection as theobject’s motion.
• The unit ofmeasurementfor force isNewtons.
• The tool used tomeasure weightor force is a spring scale.
• The unit ofmeasurement for work is Joules.
• Work can becalculated using thefollowing formula: W = F X d Work = Force X distance
• How much work is done if a force of 20 Newtons moves a box 4 meters? 20N 4m
• 20N 4mW = F X dW = 20N X 4mW = 80 Joules
• The change inposition of anobject…Motion
• Device thatmakes effortseem easier…Machine
• Object to bemoved…Load orResistance
• Force youexert on amachine…Input force
• Force exertedby a machine…Output force
• Compares the amount ofoutput force to theamount of force input. Efficiency
• 3 ways machines canchange force… amount direction distance
• Inclined plane:Flat surface that slopes.
• Less input forceneeded to move anobject, but itmust be movedover a greaterdistance.
• Examples:
• Pulley: Wheel with a rope, cable orchain around it.
• Can change thedirection and theamount of the inputforce by increasingthe distance overwhich the force isapplied.
• Examples: