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  4. A horizontal force of 25 N is necessary to just hold a block stationary against a wall. The coefficient of friction between the block and the wall is 0.4. The weight of the block is

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Q. A horizontal force of $25\, N$ is necessary to just hold a block stationary against a wall. The coefficient of friction between the block and the wall is $0.4$. The weight of the block isPhysics Question Image

Laws of Motion

Solution:

Given horizontal force $F=25\, N$ and coefficient of friction between block and wall $(\mu)=0.4$.
We know that at equilibrium horizontal force provides the normal reaction to the block against the wall. Therefore, normal reaction to the block $(R)=F=25\, N$.
We also know that weight of the block $(W)=$ Frictional force
$=\mu R=0.4 \times 25=10\, N$.