Advertisements
Advertisements
Question
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.
Advertisements
Solution
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.
APPEARS IN
RELATED QUESTIONS
When a glass rod is rubbed with a piece of silk cloth the rod ______.
Give three examples to illustrate that friction is a necessary evil.
Answer the following.
What do you understand by a force?
Answer the following in short.
What do you understand by normal force?
Tick the most appropriate answer.
If you pour some oil onto a floor, the friction would
Fill in the blank.
Bicycles use ...................... to reduce friction between the pedals and the crank
Why is a ball bearing used in a cycle hub?
Friction depends on the ______ of two surfaces in contact.
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.
Assertion: There is a danger of a vehicle skidding on a wet road.
Reason: The tires of the vehicle lose their grip on the road due to an increase in friction due to the presence of water on the road.
