Pre-Lab Q5: Consider three free-body diagrams of a metal cylinder suspended from

Question

Pre-Lab Q5: Consider three free-body diagrams of a metal cylinder suspended from a sting into a glass of water. The forces acting on the object are identified as: weight of the metal cylinder (Fa), tension in the string (Fr), and the buoyant force of the water on the cylinder (FB) Which free-body diagram shows the relative forces when the cylinder is out of the water? a. b. Which free-body diagram shows the relative forces when the cylinder is halfway in the water? Which free-body diagram shows the relative forces when the cylinder is totally submerged in the water? c.

Explanation / Answer

a) When the cylinder will be out of water buoyant force will not act on it,hence part b) depicts the free body diagram of cylinder kept out of water.

b)When the cylinder will be halfway through water only a small component of buoyant force will come in picture,tension force will also be there,hence part a.

c) When the cylinder is totally submerged then major part of upward force will be due to buoyancy and a part due to tension.Hence part c)

Note; Buoyant force increases as we dip the body in water because the volume displaced of water increases

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