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Grade - 8 (BLE) Physics Work

Find the work done if 5N force is applied to displace a book through 20 cm

Find the work done by a boy if he applies the force of 5N to displace a book through 20 cm.

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Solution:

Given,

Force applied on the book (F) = 5 N,

Displacement made by the book due to force (d) = 20 cm = 0.2 m,

Work done to displace the book (W) =?

We have, work done (W) = Force (F) × displacement (d) 

= F × d

= 5 × 0.2

= 1 joule

∴ The work done to displace the book is 1 joule.

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Comments

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

Physical Quantities 27 Electricity & Magnetism 48 Motion 8 Measurement 4 Electricity 166 Physical Optics 80 Waves 117 Force 51 Heat 137 Laws of Motion 1 Light 100 Pressure 139 Thermodynamics 1

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