Is friction desireable or undesireable give 2 reason for each ?
Answers
Friction is both desirable and undesirable . Reasons for this are-
desirable -
It helps us to hold thing, walk etc.
It prevents from slipping
undesirable-
It produces heat eg - lighting match sticks
It wears and tears eg - while erasing , the eraser's size decreases
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Answer:
A friction is desirable - a friction is very desirable to stop the body from its moving condition. if there is no friction between the contact surfaces,then a body can't be stopped without the application of external force. in the same time a person can't walk on the ground if there is no friction between the ground and our legs also no vehicle can run on he ground without the help of friction.
A friction is undesirable - a friction is undesirable during ice skating or when a block is lifted or put down on the truck with the help of some inclined plane.if the friction is more between the block and inclined surface,then a large force is required to push the block on the plane.
thus friction is desirable or undesirable depending upon the condition and types of the work