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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.
A charged glass rod attracts a charged plastic straw.
Write true or false.
The sliding friction is more than the rolling friction.
Name the two kinds of forces in nature.
Give an example to illustrate the existence of the force of friction.
Fill in the blank.
.................... is the SI unit of force.
Answer the following in short.
What do you understand by normal force?
Fill in the blank.
Weight remaining the same, friction is independent of ............. of surface in contact.
Fill in the blank.
The force of friction acting between two bodies in contact while at rest is known as ................ friction.
Tick the most appropriate answer.
Friction produces
Fill in the blank.
Friction is a type of .................
State if the following statement is true or false. Correct the statement if it is false.
Friction has no relation with our walking or running.
Answer the following in short.
When you push something heavy, the resistance you feel decreases as soon as the object starts moving. Explain the reason.
Answer the following in short.
Define rolling friction and give an example where rolling. friction comes into play.
Answer the following in short.
How can sliding friction be changed into rolling friction easily?
Answer the following in detail.
Describe three different ways by which friction can be increased to help us in various situations?
Rolling friction is slightly greater than sliding friction.
Is there any possibility of making a special device to measure the magnitude of friction directly?
In the following figure, a boy is shown pushing the box from right to left. The force of friction will act on the box
