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प्रश्न
Iqbal has to push a lighter box and Seema has to push a similar heavier box on the same floor. Who will have to apply a larger force and why?
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उत्तर
The force of friction arises because of the interlocking of irregularities on the two surfaces in contact. When a heavy object is placed on the floor, the interlocking of irregularities on the surfaces of the box and floor becomes strong. This is because the two surfaces in contact are pressed harder. Hence, more force is required to overcome the interlocking. Thus, Seema has to apply a greater force than Iqbal to push the heavier box.
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संबंधित प्रश्न
Give examples to show that friction is both a friend and a foe.
Name the three kinds of friction.
The eraser gets smaller and smaller as you use it more and more. Explain the reason.
Give three examples to illustrate that friction is a necessary evil.
Define sliding friction
Fill in the blank.
.................... is the SI unit of force.
State if the following statement is true or false. Correct the statement if it is false.
If two forces acting in opposite directions on a body arc of equal magnitude, then the body will not move.
State if the following statement is true or false. Correct the statement if it is false.
Like charges always attract each other.
Fill in the blank.
Rolling friction offers ............. resistance than sliding friction.
Fill in the blank
Rolling friction is ............. than sliding friction.
Answer the following in short.
List the various states of matter that offer frictional force?
Answer the following in detail.
Define friction and explain how it is useful to us.
Answer the following in detail.
Describe three different ways by which friction can be increased to help us in various situations?
A moving body comes to rest due to friction alone.
Complete the analogy.
Knot in a thread : _____ friction : : Ball bearing : _____ friction
Why is a ball bearing used in a cycle hub?
Friction depends on the ______ of two surfaces in contact.
Analogy
Objects placed at rest on earth: ______:: Bodies slide over the surface on other body: ______.
Assertion: Friction always opposes the motion.
Reason: Whenever one surface moves or tries to move over another surface, the force of friction starts acting on the surfaces.
