Ram and Shyam while returning from school saw a labour pushing hard to
move a heavy box. Ram immediately ran to him and started helping him in
pushing the box whereas Shyam brought two iron bars and asked the
labour to put them below the box and then to push the box.
(a) What are the factors that affect friction?
(b)Who will help the labour more-Ram or Shyam? How?
(c)What values of Ram and Shyam are shown here?
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Friction depends on the portion of the object’s weight that is acting perpendicular to the surfaces in contact, in other words, perpendicular to the desired motion. That force is called the normal force. Friction is the normal force multiplied by a fraction that depends on the materials. To start sliding objects, the fraction is called static coefficient of friction. To keep them sliding, the fraction is called kinetic coefficient of friction.
When your friend substituted iron bars
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