6.1 – work. objectives explain the meaning of work. explain the meaning of work. describe how work...
TRANSCRIPT
6.1 – Work6.1 – Work
ObjectivesObjectives
Explain the meaning of work.Explain the meaning of work. Describe how work and energy are related.Describe how work and energy are related. Calculate the work done by a given force Calculate the work done by a given force
exerted on a body.exerted on a body. Calculate power.Calculate power. Relate power to work, and solve problems Relate power to work, and solve problems
involving acceleration, force, distance and involving acceleration, force, distance and time.time.
WorkWork
Transfer of energy that occurs when Transfer of energy that occurs when a force makes an object movea force makes an object move
Work is done on an Work is done on an
object only when a object only when a
FORCE is applied to FORCE is applied to
the object and the the object and the
object movesobject moves
For work to occur, an object must For work to occur, an object must MOVE!MOVE!
The motion of the object must be in The motion of the object must be in the the same directionsame direction as the applied as the applied force on the object.force on the object.
Work & EnergyWork & Energy
RelatedRelated Energy is always transferred from Energy is always transferred from
the object DOING the work to the the object DOING the work to the object on which the work is DONE.object on which the work is DONE.
Calculating WorkCalculating Work
Work equals force times distanceWork equals force times distance Measured in JoulesMeasured in Joules
PowerPower
Amount of work Amount of work done in a certain done in a certain amount of timeamount of time
Rate at which Rate at which work is donework is done
Calculating PowerCalculating Power
Power equals work divided by timePower equals work divided by time Measured in watts (W)Measured in watts (W)
Power & EnergyPower & Energy
Since Work & Energy are related, Since Work & Energy are related, power & energy are also relatedpower & energy are also related
Power equals energy divided by timePower equals energy divided by time
In-Class AssignmentIn-Class Assignment
On a separate piece of paperOn a separate piece of paper
1.1. Describe how the scientific definition Describe how the scientific definition of work is different from the everyday of work is different from the everyday meaning of work.meaning of work.
2.2. Identify 5 forms of WORK you have Identify 5 forms of WORK you have done within the last couple daysdone within the last couple days, use , use complete sentences to describe what you complete sentences to describe what you did and the distance you moveddid and the distance you moved
– Example – This morning I lifted a case of water Example – This morning I lifted a case of water from my car and carried it 10 feet into the from my car and carried it 10 feet into the house.house.