Work.

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Presentation transcript:

Work

Work …is a force acting through a distance. In other words... Work is only done, when a force moves an object And the object must be moved in the direction of the force In other words... Work = Force x distance (W = Fd) d

Work cont. Is work done in the following examples... 1.You push as hard as you can against a door, but it does not move. No: there is no movement 2.You lift a basketball off the floor. Yes: there is force and distance 3.Superman stops a speeding jet. No: there is not movement in the direction of the force 4.You put your backpack on and carry it to the door. No: the movement is not in the direction of the force 5.You hold your backpack for five minutes. No: there is no time involved in work

Work cont. Work is measured in newton-meters (Nm) 1 Nm = 1 Joule (J) -the newton is from force -the meter is from distance 1 Nm = 1 Joule (J)

Power Horsepower (hp) …is the rate at which work is done. Power = Work Time The unit of power is the watt (W) 1 Watt = 1 joule per second (J/s) Electricity is measured in kilowatts (kW) Horsepower (hp) One hp equals 750 watts

Practice Problems for Work & Power

A car runs out of gas. Fortunately, there is a gas station nearby. You must exert force of 715 N on the car in order to move it. By the time you reach the station, you have done 2.72 x 104 J of work. How far have you pushed the car? W= F= d= What Formula do you need to use? _____________________ Solve the Problem:

The world’s most powerful tugboats, which are built in Finland, are capable of providing 8.17 x 106 W of power. How much work does one of these tugboats do in 12.0 s? W= P= d= What Formula do you need to use? _____________________ Solve the Problem:

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