Q. Friction can be undesirable when it

जब यह घर्षण अवांछनीय हो सकता है

A
Wears out machine parts
मशीन के पुर्जे घिस जाते हैं
B
Helps in walking
चलने में मदद करता है
C
Stops vehicles
वाहनों को रोकता है
D
Produces fire
आग पैदा करता है

Explanation

While friction is helpful in many cases (walking, stopping vehicles), it can be undesirable because it causes wear and tear of machine parts, reducing their lifespan and efficiency. Friction also causes loss of useful energy as heat, which can lead to overheating and damage.

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