Work

Work

• 1.
  Work and SimpleMachines
• 2.
  What is work?In science, the word work has a different meaning than you may be familiar with. The scientific definition of work is: using a force to move an object a distance (when both the force and the motion of the object are in the same direction.)
• 3.
  Work or Not?According to the scientific definition, what is work and what is not? a teacher lecturing to her class a mouse pushing a piece of cheese with its nose across the floor
• 4.
  Work or Not?According to the scientific definition, what is work and what is not? a teacher lecturing to her class a mouse pushing a piece of cheese with its nose across the floor
• 6.
  What’s work? Ascientist delivers a speech to an audience of his peers. A body builder lifts 350 pounds above his head. A mother carries her baby from room to room. A father pushes a baby in a carriage. A woman carries a 20 kg grocery bag to her car?
• 7.
  What’s work? Ascientist delivers a speech to an audience of his peers. No A body builder lifts 350 pounds above his head. Yes A mother carries her baby from room to room. No A father pushes a baby in a carriage. Yes A woman carries a 20 km grocery bag to her car? No
• 8.
  Formula for workWork = Force x Distance The unit of force is newtons The unit of distance is meters The unit of work is newton-meters One newton-meter is equal to one joule So, the unit of work is a joule
• 9.
  W=FD Work =Force x Distance Calculate: If a man pushes a concrete block 10 meters with a force of 20 N, how much work has he done?
• 10.
  W=FD Work =Force x Distance Calculate: If a man pushes a concrete block 10 meters with a force of 20 N, how much work has he done? 200 joules (W = 20N x 10m)
• 11.
  Power Power isthe rate at which work is done. Power = Work * /Time * (force x distance) The unit of power is the watt.