 Every day we do work. Many days we also don’t do work.  Work is defined as a the product of force and the distance the object moves. Work = Force ×

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Presentation transcript:

 Every day we do work. Many days we also don’t do work.  Work is defined as a the product of force and the distance the object moves. Work = Force × Distance  If the object does not move, work is not being done.  Pushing the wall vs. writing with a pencil.

 Force is measured in ______________.  Force can be calculated by taking the _______ and multiplying it by the _______ according to Newton’s _____ Law.  Distance will be measured in meters.  The unit of work then is a Nm a.k.a., the joule(J) – rhymes with cool.

How much work is done when a 1N force moves a book 2m? Work = Force =W = F × d Distance =

When 70.0 J of work is done to push a cart 3.5 m, how much force is used? Work = Force =W = F × d Distance =

Haw far does a barbell move when the person expends 1100J in exerting 500N of force? Work = Force =W = F × d Distance =

 How powerful a person is physically depends on two things: the amount of work they can do, and how fast they can do it.  Power is defined as a the amount of work done during a certain period of time. Power = Work ÷ Time  Who has more power a small person running fast or a big person walking slow?

 Work is measured in ______________.  Work can be calculated by taking the _______ and multiplying it by the _______.  Time will be measured in seconds.  The unit of power then is a J/s, a.k.a. the watt (yes, like the unit on your power bill) whose symbol is W.

How much power is required to do 55 joules of work in 55 seconds? Power= Work = Time =

If it take 400 watts of power to push a heavy box a certain distance in 10 seconds, how much work was done? Power= Work = Time =

How much time would it take to move a car 350 m if a 35 N force was pushing so that 2042 watts of power were used? Power= Work = Time =

How much power does a person have if they push a cart 3.5m with 20N of force for 0.5 seconds? Power= Work = Time =

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