The laws of static friction are applicable when:

A) Applied force is higher than limiting static frictional force and body is stationary
B) Applied force is lower than limiting static frictional force and body is stationary
C) Applied force is higher than limiting static frictional force and body is in motion
D) Applied force is lower than limiting static frictional force and body is in motion

The laws of static friction apply when the applied force is less than the limiting static frictional force, and the body is stationary. Therefore, the correct answer is option B. This ensures that the static friction can maintain its role in preventing motion when forces are applied.
;

Answered by Anonymous | 2025-07-04

Static friction is a force that keeps an object at rest when a force is applied until it overcomes the maximum force of static friction, known as the limiting static friction. The laws of static friction describe how this force operates based on the amount of applied force compared to the limiting static frictional force.
To address the question and select the correct scenario where the laws of static friction are applicable, we need to understand the conditions:

Limiting Static Friction: This is the maximum frictional force that needs to be overcome to set an object in motion. It occurs right before the object starts moving.

Applied Force: This is the external force applied to the object. The object remains stationary if the applied force is less than or equal to the limiting static friction.


Let's analyze the options provided:

(A) Applied force is higher than limiting static frictional force and body is stationary: If the applied force is higher than the limiting static frictional force, the object would move, so this isn't correct.

(B) Applied force is lower than limiting static frictional force and body is stationary: This is correct because the object remains stationary when the applied force is less than the limiting static frictional force. The static friction matches the applied force up to its limit, keeping the object at rest.

(C) Applied force is higher than limiting static frictional force and body is in motion: If the applied force exceeds the limiting static friction, the object moves, and kinetic friction takes over, not static friction.

(D) Applied force is lower than limiting static frictional force and body is in motion: This situation cannot occur because a moving body indicates that static friction has been overcome and the body is experiencing kinetic friction.


Based on this analysis, the correct answer is (B) Applied force is lower than limiting static frictional force and body is stationary.
This scenario describes how static friction works before the body starts to move, perfectly demonstrating the laws of static friction.

Answered by JessicaJessy | 2025-07-06