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प्रश्न
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.
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उत्तर
It is because when the object is at rest, static friction occurs. The static friction is maximum when the applied force is just short of the force required to start motion between the two bodies in contact. Once the object starts moving, friction (resistance) we feel decreases.
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संबंधित प्रश्न
Fill in the blank.
We use ball bearings to .................. the friction.
Select the correct alternative.
Friction is reduced by
State two factors which directly affect the force of friction.
A body needs a force F1 just to start moving on a surface, a force F2 to continue its motion and a force F3 to roll on the surface. What is
- the static friction
- sliding friction and
- rolling friction? State whether F2 is equal, less than or greater than (1) F1 and (2) F3.
Fill in the blank.
More the roughness of a surface, greater is the ........................
Fill in the blank.
Sliding friction and rolling friction are types of .................. friction.
Fill in the blank.
Friction depends upon the ............... of an object.
Rolling friction is slightly greater than sliding friction.
Explain how friction can be minimized.
Is there any possibility of making a special device to measure the magnitude of friction directly?
