(D) Observer $A$ is inside the elevator,which is an accelerating frame of reference. In the frame of reference of $A$,the block is at rest because it

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(D) Observer $A$ is inside the elevator,which is an accelerating frame of reference. In the frame of reference of $A$,the block is at rest because it moves with the same acceleration as the elevator. Since the block is at rest relative to observer $A$,its displacement $d$ is zero $(d = 0)$. Work done is defined as $W = F \cdot d \cdot \cos(\theta)$. Since the displacement $d$ is zero for observer $A$,the work done by any force (gravity,normal reaction,or pseudo force) acting on the block is zero. Therefore,all the given statements are correct.

Class 11 Physics Newton's Laws of Motion and Friction Apparent weight and Pseudo Force

Difficult

$A$ block of mass $m$ is kept in an elevator which starts moving downward with an acceleration $a$ as shown in the figure. The block is observed by two observers $A$ and $B$ for a time interval $t_0$. According to the observer $A$,which of the following is true?

A
the work done by gravity is zero
B
the work done by normal reaction is zero
C
the work done by pseudo force is zero
D
all the above

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Class 11 Questions

Class 11

Physics Questions

Chapter

Newton's Laws of Motion and Friction

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Apparent weight and Pseudo Force

The weight of a man in a lift moving upward is $608 \ N$,while the weight of the same man in the lift moving downward with the same acceleration is $368 \ N$. His normal weight is ............ $N$.

Medium

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$A$ mass $M$ is placed on a smooth wedge of angle $\theta$ resting on a frictionless surface. To keep the mass $M$ at rest relative to the wedge,the wedge must be given a horizontal acceleration $a$ equal to:

MediumAIPMT 1998

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$A$ plumb bob is hanging from the ceiling of a car. If the car moves with an acceleration $a$,the angle made by the string with the vertical is

MediumMHT CET 2012

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$A$ trolley is accelerating down an incline of angle $\theta$ with acceleration $g \sin \theta$. Which of the following is correct? ($\alpha$ is the constant angle made by the string with the vertical.)

Difficult

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$A$ block can slide on a smooth inclined plane of inclination $\theta$ kept on the floor of a lift. When the lift is descending with a retardation $a$,the acceleration of the block relative to the incline is

Medium

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$A$ block of mass $m$ is kept in an elevator which starts moving downward with an acceleration $a$ as shown in the figure. The block is observed by two observers $A$ and $B$ for a time interval $t_0$. According to the observer $A$,which of the following is true?

Similar Questions

The weight of a man in a lift moving upward is $608 \ N$,while the weight of the same man in the lift moving downward with the same acceleration is $368 \ N$. His normal weight is ............ $N$.

$A$ mass $M$ is placed on a smooth wedge of angle $\theta$ resting on a frictionless surface. To keep the mass $M$ at rest relative to the wedge,the wedge must be given a horizontal acceleration $a$ equal to:

$A$ plumb bob is hanging from the ceiling of a car. If the car moves with an acceleration $a$,the angle made by the string with the vertical is

$A$ trolley is accelerating down an incline of angle $\theta$ with acceleration $g \sin \theta$. Which of the following is correct? ($\alpha$ is the constant angle made by the string with the vertical.)

$A$ block can slide on a smooth inclined plane of inclination $\theta$ kept on the floor of a lift. When the lift is descending with a retardation $a$,the acceleration of the block relative to the incline is

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