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If a block is kept in an accelerating elevator, then how does the pseudo force generated act, and...

Question:

If a block is kept in an accelerating elevator, then how does the pseudo force generated act, and on which body does it act?

Concept of Pseudo Force:


The frame of reference is the imaginary system confining the observable like the initial and final velocity of the body, time, etc. The frame of reference can inertial and non-inertial frames of reference.

Answer and Explanation:


  • The pseudo can be related to the action of inertia.
  • Whenever the frame of reference is subjected to the acceleration then the body tends to conserve its state of rest/motion.
  • This opposing effect by the body in a frame of reference generates the pseudo force.
  • For the case of a block lying on the floor of a lift will have weight force acting on it due to gravity.
  • As a result of weight force, the normal force will act in the upward direction.
  • The system of frame of reference in the aforesaid condition is inertial frame of reference (Newtonian mechanics is applicable).
  • Now for the case when the lift accelerates upwards then the resultant force is in the upward direction.
  • The inertia will tend the body to remain at rest (initially) and they tend to keep the body at uniform velocity every time when the lift speed is increasing.
  • Therefore, a continuous pseudo force would be acting on the block in addition to its weight force (in a downward direction).
  • Hence, the block would appear heavier when the elevator is accelerating upwards.
  • The case reverses when the elevator is accelerating downwards and the block would appear lighter.


The diagram is shown below,

Diagram (Ms Word)


Learn more about this topic:

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Inertial Frame of Reference: Definition & Example

from General Studies Science: Help & Review

Chapter 4 / Lesson 12
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