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5.Work, Energy, Power and Collision
normal
$100\ gm$ દળનો એક પદાર્થ $r $ ત્રિજ્યા વક્ર પથ પર અચળ ઝડપથી ગતિ કરે છે. એક સંપૂર્ણ પરિભ્રમણ દરમિયાન થતું કાર્ય કેટલું હશે ?
A$100 r J$
B$\frac{r}{{100}}\,J$
C$\frac{{100}}{r}\,J$
Dશૂન્ય
Solution
Work done $W=F S \cos \theta$
where $\theta$ is the angle between $F$ and $S$.
If $\theta=90^{\circ} \Longrightarrow W =0$
Thus the work done by a force will be zero if the object moves in a direction perpendicular to the direction of applied force.
Displacement of the body revolving in a circular path is along the tangent whereas centripetal force acts radially inwards i.e they are perpendicular to each other.
Hence, work done in this case by the centripetal force is zero.
where $\theta$ is the angle between $F$ and $S$.
If $\theta=90^{\circ} \Longrightarrow W =0$
Thus the work done by a force will be zero if the object moves in a direction perpendicular to the direction of applied force.
Displacement of the body revolving in a circular path is along the tangent whereas centripetal force acts radially inwards i.e they are perpendicular to each other.
Hence, work done in this case by the centripetal force is zero.
Standard 11
Physics
