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Nilanjan Bhowmick AIR 3, CSIR NET (Earth Science)
- IIT JAM
- Physics (PH)
Physics doubt-example of Newton second law of motion
Two bodies having same mass but different size produce different acceleration explain this with any example
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Sapna
In practical, every body suffer frictional forces and resistance during motion and these fictitious forces depends on size of body which results in different acceleration
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Somnath
Consider two bodies of same mass but one is solid and another is thin hollow sphere.The volume of hollow sphere is very large compared to other one. Now if you drop the two bodies from same height in air medium think which one will fall faster? consider the forces on the bodies.Here 2 types of forces are acting on the bodies.... 1.force of gravity acting vertically downward. 2.force of buoyancy vertically upward. Here since the mass of the two objects are same downward force of gravity on the the two bodies are same. But buoyancy force depends on the volume of the bodies.Since volume of the thin hollow sphere is greater than the solid sphere,upward buoyancy force on the hollow one is greater. So net downward force(force of gravity-buoyancy force) on the hollow sphere is less than the solid sphere.Therefore its acceleration will be less than the other).
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Hi Somnath, I think hollow sphere has lesser volume than solid one.
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Dr. manish kumar gupta Best Answer
Ideally in vacuum, they will produce the same acceleration (g) but in the presence of any medium, their accelerations are different. This is due to the thrust exhausted by the medium on the object. For example: If a ball of 50 gm and a carton of 50 is dropped from the top of any roof, ball will reach first to the ground as ball will face less thrust (opposite force) due to less contact surface with the medium. I hope things are now clear.