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Grade - 8 (BLE) Physics Work

Calculate work done against friction when 5 kg mass is dragged about 5 m distance.

Calculate work done against friction when 5 kg mass is dragged about 5 m distance.

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Solution:

Given,

Mass of an object = 5 kg,

displacement covered by the object due to force (d) = 5 m,

Work done against the friction (W) =?

We know that the, work done against the friction (W) = force × displacement 

= F×d

= m×gxd        [ Force = mass × acceleration due to gravity ]

= 5×10×5      [ g = 10 m/s2 ]

= 250 joules

Hence, the work done against friction is 250 joules.

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Things to Remember From Work

  1. Work is said to be done if any object changes its position by the application of force on it.
  2. The SI unit of work is the joule
  3. Generally, there are two types of work
    1. work against gravity,
    2. work against friction.
  4. The work done by an object is zero if
    1. Displacement is zero, and
    2. Force is perpendicular to the displacement.

Topics from Physics

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