NEET · Physics · Centre of Mass

Exercise and reference answers

Matching pairs

1. Left

   Two equal masses on x-axis (x₁, x₂)

   Right

   x_cm = (x₁ + x₂) / 2

2. Left

   Two unequal masses (m₁ at x₁, m₂ at x₂)

   Right

   (m₁x₁ + m₂x₂) / (m₁ + m₂)

3. Left

   Uniform thin rod of length L

   Right

   Midpoint of the rod

4. Left

   Uniform circular disc

   Right

   Geometric centre

5. Left

   External force F on system

   Right

   F = M_total × a_cm

6. Left

   Closed system, no external force

   Right

   v_cm = constant

Instructions

Match each scenario to its centre-of-mass result.