Normal Reaction by Water

Classical Mechanics Level 3

Consider a metal cube on the bottom of an empty beaker. We then fill the beaker with water till it just submerges the cube.

How does the normal reaction on the cube by the beaker change, when the cube is just submerged compared to when the beaker is empty?

Will become zero Remain the same Decrease Increase

Troglio Rodrigues by Troglio Rodrigues , 28, India

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1 solution

Assuming that there is no water on top of the cube, nothing has changed as far as the bottom of the cube is consered. Hence the normal reaction remains the same. If there is water on top of the cube, normal reaction at the bottom will increase.

2 Helpful 0 Interesting 0 Brilliant 0 Confused

IF WATER COMES IN BETWEEN THE BLOCK AND BEAKER THEN NORMAL WILL DEC

jaivir singh - 7 years ago

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I think it will increase to the amount due to water!

Niranjan Khanderia - 7 years ago

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It will decrease because it will be difference of weight and buoyancy force

Pulkit Sahni - 7 years ago

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@Pulkit Sahni – Would not the buoyancy force supplied by the bottom ? Or else where does it come from ?

Niranjan Khanderia - 7 years ago

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@Niranjan Khanderia – Buoyancy force is net pressure difference force and normal is a contact force

Pulkit Sahni - 7 years ago

The correct answer is Remain the same !! HOW ???

Peter Adel - 7 years ago

you are correct....... but this is not a good question!

Mayank Holmes - 7 years ago

It will surely decrease since upward thrust (d*volume submerged *g)acting on the block comes in action....... Reducing normal rxn on BLOCK

Sarthak Sharma - 4 years, 7 months ago

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