Advertisements
Advertisements
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?
Advertisements
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.
संबंधित प्रश्न
Friction opposes the ______ between the surfaces in contact with each other.
Explain why sportsmen use shoes with spikes.
Give examples to show that friction is both a friend and a foe.
Write true or false.
The sliding friction is more than the rolling friction.
Write true or false.
Liquids offer more friction than the gases.
Give an example to illustrate the existence of the force of friction.
What is the cause of friction?
Define sliding friction
Answer the following.
What do you understand by a force?
Answer the following in a word or two or in a sentence.
Which type of force acts on a string pulled from both ends?
Answer the following in a word or two or in a sentence.
Why does a rolling ball stop after moving some distance?
Answer the following in short.
What do you understand by normal force?
Fill in the blank.
The force of friction acting between two bodies in contact while at rest is known as ................ friction.
Fill in the blank.
Rolling friction is ........... than sliding friction.
Fill in the blank.
Friction is a type of .................
Fill in the blank.
Bicycles use ...................... to reduce friction between the pedals and the crank
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.
Explain how friction can be minimized.
Analogy
Objects placed at rest on earth: ______:: Bodies slide over the surface on other body: ______.
