Buoyancy Forces

Why does object sink in water?

• The object is less dense than the water.

• The buoyant force is smaller than weight.

• The buoyant force is greater than weight.

• The object has the same density as water.

The weight of a stone is 20 N. When it is immersed in water, its weight is 15 N. What is the buoyant force acting on the stone?

• 2 N

• 3 N

• 4 N

• 5 N

Diagram shows an investigation conducted by Mazni. How much is the buoyant force exerted on the object when it was in the water?

• 1.07 N

• 0.28 N

• 0.27 N

• 1.68 N

A buoyant force is an upward force applied on an object by a ___________

• substance

• fluid

• pressure

• displacement

An object will _______ if the weight of it is equal to the weight of the water in which it is in.

• float

• sink

• expand

• shrink

An object will ______ if its' density is greater than the density of the fluid it is in.

• expand

• shrink

• float

• sink

When the weight of an object is greater than the buoyant force, the object will ...

• sink

• float

• expand

• shrink

If an object is more dense than the fluid which it is in, the buoyant force will be less and the object will ... 

• float
• sink
• shrink
• expand

To float in water, an object must

• be less dense than water

• be more dense than water

• have less surface area than water

• have more surface area than water

Which object, if thrown into a liquid, will have a greater buoyant force?

• Balloon
• Apple
• Rock
• Cell Phone