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To start your loaded trolley bag, you exert more force than when it is

June 1, 2025 by rawan239

To start your loaded trolley bag, you exert more force than when it is moving. This is an example of

first law of thermodynamics

second law of thermodynamics

Newton's second law of motion

Newton's first law of motion

This question was previously asked in

UPSC CAPF – 2012

Download PDF Attempt Online

This phenomenon is an example that relates to Newton’s first law of motion. Newton’s First Law states that an object at rest stays at rest, and an object in motion stays in motion with the same speed and in the same direction unless acted upon by an unbalanced force. To start the loaded trolley bag from rest, you need to exert a force strong enough to overcome its inertia (resistance to change in state of motion) and the static friction between the trolley and the ground. Once the trolley is moving, the friction acting on it is kinetic friction, which is typically less than the maximum static friction. Therefore, less force is required to keep it moving than to start it from rest. The principle that a force is required to change the state of rest is central to the first law.

– Newton’s First Law describes inertia, the resistance of an object to changes in its state of motion.
– Static friction opposes the start of motion and is generally greater than kinetic friction, which opposes motion while it is occurring.
– Overcoming inertia and static friction requires more force than overcoming kinetic friction to maintain motion.

Newton’s Second Law (F=ma) describes the relationship between force, mass, and acceleration, which applies once a net force is acting. While the forces (applied force, friction) and resulting motion are governed by the Second Law, the observation about needing more force to *start* is fundamentally about overcoming the initial resistance to motion described by the First Law and the nature of static vs. kinetic friction. The First Law provides the foundational principle that a force is necessary to initiate motion from rest.

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