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Motion Of Bodies In Contact - Practice Questions & MCQ
Updated on Sep 18, 2023 18:34 AM | #JEE Main
Quick Facts
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Motion of Block in Contact is considered one the most difficult concept.
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14 Questions around this concept.
Solve by difficulty
A block of mass m is connected to another block of mass M by a spring ( massless ) of spring constant K . The blocks are kept on a smooth horizontal plane.Initially the blocks are at rest and the spring is unstretched Then a constant force F starts acting on the block of mass M to pull it. Find the force of the block of mass m.
Two bodies of masses 4 kg and 5 kg are acted upon by the same force. If the acceleration of a lighter body is $2 \mathrm{~ms}^{-2}$, acceleration of a heavier body is:
Find the tension $T_2$ for the system shown in fig:
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Concepts Covered - 1
Motion of Block in Contact
$\begin{aligned} & \text { Use } F_{n e t}=m a \\ & a=\frac{F_{n e t}}{m_1+m_2}\end{aligned}$
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When 2 Blocks are in Contact
$\begin{aligned} & F-f=m_1 a \\ & f=m_2 a \\ & a=\frac{F}{m_1+m_2} \\ & f=\frac{m_2 F}{m_1+m_2}\end{aligned}$
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When 3 Blocks are in Contact
$\begin{aligned} & \text { Use } F_{n e t}=m a \\ & a=\frac{F}{m_1+m_2+m_3} \\ & f_1=\frac{\left(m_2+m_3\right) F}{m_1+m_2+m_3} \\ & f_2=\frac{m_3 F}{m_1+m_2+m_3}\end{aligned}$
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