Introduction to Surface Tension 
Solved Video Example 1- Solved Video Example 2
Introduction to Surface Tension
Solved Examples
A matchstick of length 3 cm and mass 1.5 grams is floating in water. When the water on one side of the match is touched with soap, find the acceleration of the matchstick. Take surface tension of water is 0.07 N/m and surface tension of soap solution is 0.03 N/m. Assume that the surface of the soap side entirely becomes uniform soap solution as soon as the soap touches the water and ignore viscosity.
0.6 m/s2
0.8 m/s2
1.2 m/s2
1.6 m/s2
Solved Examples
A thin square plate of area 400 cm2 is initially under water and is being lifted up by a string. If the mass of the plate is 5 grams and the surface tension of water is 0.07 N/m, find the minimum tension in the string required to lift the plate. Assume g = 10 m/s2.
0.014 N
0.05 N
0.106 N
0.21 N