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    <pre style="white-space:pre-line"><code>4. Turning Effect of Forces  eLearn.Punjab

STUDENTâ€™S LEARNING OUTCOMES

After studying this unit, the students will be able to:
â€¢	 Define like and unlike parallel forces.
â€¢	 State head to tail rule of vector addition of forces/vectors.
â€¢	 Describe how a force  is  resolved  into  its  perpendicular

   components.
â€¢	 Determine the magnitude and direction of a  force from

   its perpendicular components.
â€¢	 Define moment of force or torque as moment = force x

   perpendicular distance from pivot to the line of action of
   force.
â€¢	 Explain the turning effect of force by relating it to everyday
   life.
â€¢	 State the principle of moments.
â€¢	 Define the centre of mass and centre of gravity of a body.
â€¢	 Define couple as a pair of forces tending to produce
   rotation.
â€¢	 Prove that the couple has the same moments about all points.
â€¢	 Define equilibrium and classify its   types by quoting examples from everyday life.
â€¢	 State the two conditions for  equilibrium of a body.
â€¢	 Solve problems on simple balanced systems  when bodies are supported by one pivot only.
â€¢	 Describe the states of equilibrium and classify them with common examples.
â€¢	 Explain effect of the position of the centre of mass on the stability of simple objects.

INVESTIGATION SKILLS

The students will be able to:
â€¢	 Determine the position of centre of mass/gravity of regularly and irregularly shaped objects.

                             2

                                                                                                   v: 1.1</code></pre>
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