A man squatting on the ground gets straight up and stand....

A man squatting on the ground gets straight up and stand. The force of reaction of ground on the man during the process is $\quad$ [NCERT Exemplar] (a) constant and equal to $m g$ in magnitude (b) constant and greater than $m g$ in magnitude (c) variable but always greater than $\mathrm{mg}$ (d) at first greater than $m g$, and later becomes equal to $m g$

A man squatting on the ground gets straight up and stand. The force of reaction of ground on the man during the process is $\quad$ [NCERT Exemplar]
(a) constant and equal to $m g$ in magnitude
(b) constant and greater than $m g$ in magnitude
(c) variable but always greater than $\mathrm{mg}$
(d) at first greater than $m g$, and later becomes equal to $m g$

Labs

Want to see this concept in action?

NEW

Explore this concept interactively to see how it behaves as you change inputs.

View Labs

Key Concepts

Normal Reaction Force

The normal force is the support force exerted by a surface perpendicular to the object in contact with it. When the man stands up, his normal force from the ground changes dynamically, initially exceeding his weight when accelerating upward and later matching his weight when his acceleration ceases.

Dynamics of Accelerated Motion

In accelerated motion, the net force acting on an object is related to both its gravitational force and the additional forces required for acceleration. During the transition from a squat to a stand, the force the ground exerts on the man varies with his acceleration, starting above his weight to accelerate him upward, and then reducing to balance the gravitational force once uniform motion or rest is achieved.

Newton's Third Law of Motion

This law states that for every action there is an equal and opposite reaction. In contexts like a man rising from a squat, as he pushes down on the ground with a force greater than his weight, the ground responds with a reaction force of equal magnitude but in the opposite direction.

Transcript

Please give Ace some feedback