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CBSE Class 11-science Answered

Friction
Asked by Tushar Puranik | 26 Nov, 2013, 08:36: AM
answered-by-expert Expert Answer
The cause of sliding friction is the minute roughness of the two surfaces sliding over each other.
Ideally two smooth surfaces appear smooth only from outside, but if one sees through a microscope, then there are few uneven grooves on the surface. This causes the friction between the two surfaces.
 
Kindly ask separate questions as separate queries.
Answered by Romal Bhansali | 26 Nov, 2013, 10:05: AM

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CBSE 11-science - Physics
Respected Ma'am/Sir please clarify my doubt.
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CBSE 11-science - Physics
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CBSE 11-science - Physics
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CBSE 11-science - Physics
Two blocks of mass m=5kg and M=10 kg are connected by a string passing over a pulley B as shown. Another string connects the centre of the pulley B to the floor and passes over another pulley A as shown. An upward force F is applied at the centre of pulley A. Both the pulleys are massless. Find the acceleration of both the blocks if 1) F=100N.  2)F=500N
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CBSE 11-science - Physics
A block of mass m is placed on a wedge as shown. Find difference between maximum and minimum (a(max) – a(min) ) horizontal rightward acceleration of wedge for which block remains at rest with respect to wedge. (A) 10g/9 (B) g/9 (C) g (D) None of these
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CBSE 11-science - Physics
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CBSE 11-science - Physics
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CBSE 11-science - Physics
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CBSE 11-science - Physics
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CBSE 11-science - Physics
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