A ball of mass m is attached to a string whos | vedclass

Name: Exam Paper Generator | JEE NEET Paper Generator | Vedclass
Brand: Vedclass
Rating: 5 (35 reviews)

Question

(A) The work done by a force is given by $W = \vec{F} \cdot \vec{d} = F d \cos(		heta)$,where $	heta$ is the angle between the force and the displac

Vedclass · Accepted Answer

Tension is always perpendicular to the direction of motion of the ball.

Vedclass · Answer

(A) The work done by a force is given by $W = \vec{F} \cdot \vec{d} = F d \cos(		heta)$,where $	heta$ is the angle between the force and the displacement vector.In the case of a ball attached to a string,the tension force acts radially inward towards the center of rotation.The velocity (and thus the instantaneous displacement) of the ball is always tangential to the circular path.Since the radius is always perpendicular to the tangent,the angle between the tension force and the displacement is $90^{\circ}$.Therefore,the work done by tension is $W = T d \cos(90^{\circ}) = 0$.

$A$ ball of mass $m$ is attached to a string whose other end is fixed. The system is free to rotate in a vertical plane. When the ball swings,no work is done on the ball by the tension in the string. Which of the following statements is the correct explanation?

Similar Questions

$A$ force $\overrightarrow{F} = 6\hat{i} + 2\hat{j} - 3\hat{k}$ acts on a particle and produces a displacement of $\overrightarrow{s} = 2\hat{i} - 3\hat{j} + x\hat{k}$. If the work done is zero,the value of $x$ is

At time $t=0$,a particle starts moving along the $x$-axis. If its kinetic energy increases uniformly with time $t$,the net force acting on it must be proportional to

$A$ body of mass $6\,kg$ is under a force which causes displacement in it given by $S = \frac{t^2}{4}$ metres, where $t$ is time. The work done by the force in $2\,seconds$ is ............... $J$.

$A$ porter lifts a heavy suitcase of mass $80\, \text{kg}$ and at the destination lowers it down by a distance of $80\, \text{cm}$ with a constant velocity. Calculate the work done by the porter in lowering the suitcase. (Take $g = 9.8\, \text{m/s}^2$) (In $\text{J}$)

$A$ force $\vec F = 6\hat i + 2\hat j - 3\hat k$ acts on a particle,causing a displacement $\vec d = 2\hat i - 3\hat j + c\hat k$. If the work done during this process is zero,find the value of $c$.

Vedclass Test Series

Exam Paper Generator

Online Exam Module