Study Online and Download KIPS 9th Class Physics Notes Unit 4: Turning Effect of Forces. In this unit, we will learn many interesting concepts such as torque, equilibrium, etc. and their applications in daily life.
Study Online and Download KIPS 9th Class Physics Notes Unit 4: Turning Effect of Forces. Can the nut of the axle of a bike be loosened with hand? A spanner increases the turning effect of the force. Look at the picture on the previous page. What is the joker doing? He is trying to balance himself on a wooden plank which is placed over a cylindrical pipe. Can we do the same? A baby gradually learns to stand by balancing herself. Women and children in the villages often carry pitchers with water on their heads. With a little effort we can learn to balance a stick vertically up on our finger tip. Balanced objects are said to be in equilibrium. In this unit, we will learn many interesting concepts such as torque, equilibrium, etc. and their applications in daily life.
After studying this unit, the students will be able to:
- define like and unlike parallel forces.
- state head to tail rule of vector addition of forces/vectors.
- describe how a force is resolved into its perpendicular components.
- determine the magnitude and direction of a force from its perpendicular components.
- define moment of force or torque as moment = force x perpendicular distance from pivot to the line of action of force.
- explain the turning effect of force by relating it to everyday life.
- state the principle of moments.
- define the centre of mass and centre of gravity of a body.
- define couple as a pair of forces tending to produce rotation.
- prove that the couple has the same moments about all points.
- define equilibrium and classify its types by quoting examples from everyday life.
- state the two conditions for equilibrium of a body.
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