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Varying Mass System

The coefficie...

Question

The coefficient of friction between $4 k g$ and $5 k g$ block is $0.2$ and between $5 k g$ and ground is $0.1$ respectively. Choose the correct statements

Minimum force needed to cause system to move is 17 N

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When force is 4N static friction at all surfaces is 4N to keep system at rest

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Maximum acceleration of 4 kg block is 2 m/s2

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Slipping between 4 kg and blocks start when F is > 17 N

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Solution

The correct option is C Maximum acceleration of 4 kg block is 2 m/s2
Book $P$ moves due to friction, therefore maximum acceleration of $4$ kg block may be:
$a = \frac{maximum friction between P and Q}{mass of block P}$
$= \frac{0.2 \times 4 \times 10}{4}$
$= 2$ $m / s^{2}$

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The coefficient of friction between 4kg and 5kg block is 0.2 and between 5kg and ground is 0.1 respectively. Choose the correct statements

The correct option is C Maximum acceleration of 4 kg block is 2 m/s2Book P moves due to friction, therefore maximum acceleration of 4 kg block may be: a=maximum friction between P and Qmass of block P =0.2×4×104 =2 m/s2

The coefficient of friction between $4 k g$ and $5 k g$ block is $0.2$ and between $5 k g$ and ground is $0.1$ respectively. Choose the correct statements

The correct option is C Maximum acceleration of 4 kg block is 2 m/s2
Book $P$ moves due to friction, therefore maximum acceleration of $4$ kg block may be:
$a = \frac{maximum friction between P and Q}{mass of block P}$
$= \frac{0.2 \times 4 \times 10}{4}$
$= 2$ $m / s^{2}$