1 / 8

Work

Work. Work is done whenever a force moves. The unit of work is the Joule ( J ) 1 joule of work is done when a force of 1 newton moves a distance of l metre 1 N 1 m There is an equation for calculating work:

Download Presentation

Work

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript


  1. Work • Work is done whenever a force moves. • The unit of work is the Joule (J) • 1 joule of work is done when a force of 1 newton moves a distance of l metre • 1 N 1 m • There is an equation for calculating work: • Work done = force x distance moved

  2. Work done = force x distance moved 1 joule = 1 newton x l metre1 J = 1 x 1 Nm W F x d To make the calculations easier we use a triangle ÷ ÷

  3. W = F x dCalculate the work done when a force of 2N moves an object 3M Given: Force = 2 N Distance = 3 m Work done = ? J Substitute Cover the quantity to be calculated with your finger To get the equation W = F x d W F x d Work done (J) = Force (N) x Distance (m) ? (J) = 2 (N) x 3 (m) ? (J) = 2 x 3 (Nxm) The variables must be in their correct SI units Work = Joules (J) Force = Newton (N) Distance = Metres(M)

  4. W = F x dCalculate the work done when a force of 12N moves an object 0.5M Given: Force = ? N Distance = ? m Work done = ? J Substitute Cover the quantity to be calculated with your finger To get the equation W = F x d W F x d Work done (J) = Force (N) x Distance (m) ? (J) = (N) x (m) ? (J) = (Nxm) The variables must be in their correct SI units Work = Joules (J) Force = Newton (N) Distance = Metres(M)

  5. W = F x dCalculate the work done when a force of 10 N moves an object 10mm Given: Force = ? N Distance = ? m Work done = ? J Substitute Cover the quantity to be calculated with your finger To get the equation W = F x d W F x d Work done (J) = Force (N) x Distance (m) ? (J) = (N) x (m) ? (J) = (Nxm) The variables must be in their correct SI units Work = Joules (J) Force = Newton (N) Distance = Metres(M)

  6. W = F x dCalculate the force used when 24 J of work moved an object 6 m Given: Force = ? N Distance = 6 m Work done = 24 J Substitute Cover the quantity to be calculated with your finger To get the equation F = W d F = W ÷ d W F x d Force(N) = Work done (J) ÷ Distance (m) F = W = 24 d 6 = 4 N Remember 1 Joule = 1 Nm Nm cancel to N m

  7. W = F x dWhen a force of 6 N is applied and 42 J of work are done how far would the fly travel across the room ? Given: Force = 6 N Distance = ? m Work done = 42 J Substitute Cover the quantity to be calculated with your finger To get the equation d = W F d = W ÷ F W F x d Force(N) = Work done (J) ÷ Distance (m) d = W = 42 F 6 = 7 m Remember 1 Joule = 1 Nm Nm cancel to m N

  8. More calculations: • How much work does a gardener do when he pushes a wheel barrow with a force of 75N for a distance of 20 metres? • A boy climbs stairs 3m high and does 1800J of work. Calculate the force of the boy? • A car brakes hard and its tyre marks stretch for 40m. A force of 400N was applied to cause the car to stop. How much energy was converted to heat and sound? • How far would a 600N skateboarder travel if he has just eaten a 1450kJ hamburger for lunch?

More Related