Friction

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A block of mass 10 kg is placed on a rough horizontal surface having a coefficient of friction µ = 0.5. If a horizontal force of 100 N is applied on it, then the acceleration of the block will be (g = 10 m/s^2):

Select the correct option:

$0.5 m / s^{2}$

$5 m / s^{2}$

$10 m / s^{2}$

$15 m / s^{2}$

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About This Question

Subject: physics
Chapter: laws of motion
Topic: friction
Difficulty: Easy
Year: 2025

Solution

Correct Answer:

$5 m / s^{2}$

Limiting Friction ( $f_{l}$ ): $f_{l} = μ N = μ m g = 0.5 \times 10 \times 10 = 50 N$ .
Analysis: The applied force $F_{a ppl i e d} = 100 N$ is greater than the limiting friction ( $50 N$ ), so the block will move.
Net Force: $F_{n e t} = F_{a ppl i e d} - f_{l} = 100 - 50 = 50 N$ .
Acceleration ( $a$ ): $a = \frac{F _{n e t}}{m} = \frac{50}{10} = 5 m/s^{2}$ .

This easy difficulty physics question is from the chapter laws of motion, covering the topic of friction. It appeared in the 2025 exam.

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Friction

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