Question:
Figure shows a uniform rod of length $30 \,cm$ having a mass of $3.0 \,kg$. The strings shown in the figure are pulled by constant forces of $20 \,N$ and $32 \,N$. Find the force exerted by $20 \,cm$ part of the rod on the $10\, cm$ pan. All the surfaces are smooth and the strings and pulleys are light
Figure shows a uniform rod of length $30 \,cm$ having a mass of $3.0 \,kg$. The strings shown in the figure are pulled by constant forces of $20 \,N$ and $32 \,N$. Find the force exerted by $20 \,cm$ part of the rod on the $10\, cm$ pan. All the surfaces are smooth and the strings and pulleys are light
Updated On: Jul 14, 2024
- 36 N
- 12 N
- 64 N
- 24 N
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The Correct Option is D
Solution and Explanation
Net force on the rod, $f=32-20=12\, N$
Acceleration of rod $=\frac{f}{m}=\frac{12}{3}=4 \,ms ^{-2}$
Equation of motion of $10\, cm$ part is
$F-20 =m \times a=1 \times 4 $
$F =4+20=24\, N$
Similarly, Equation of motion $20 \,cm$ part is
$32-F =m' a=2 \times 4 $
$F =32-8=24 \,N$
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Concepts Used:
Mechanical Properties of Solids
Mechanical properties of solids intricate the characteristics such as the resistance to deformation and their strength. Strength is the ability of an object to resist the applied stress, to what extent can it bear the stress.
Therefore, some of the mechanical properties of solids involve:
- Elasticity: When an object is stretched, it changes its shape and when we leave, it retrieves its shape. Or we can say it is the property of retrieving the original shape once the external force is removed. For example Spring
- Plasticity: When an object changes its shape and never attains its original shape even when an external force is removed. It is the permanent deformation property. For example Plastic materials.
- Ductility: When an object is been pulled in thin sheets, wires or plates, it will be assumed that it has ductile properties. It is the property of drawing into thin wires/sheets/plates. For example Gold or Silver
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