Understanding Upthrust and Buoyancy

What is the upward force exerted by a fluid on a submerged body called?

• Weight

• Upthrust

• Gravity

• Pressure

According to Archimedes' Principle, what does the upthrust on a body equal?

• The weight of the body

• The weight of the fluid displaced

• The density of the fluid

• The volume of the body

What happens if the upthrust (𝐹𝐵) is less than the weight (𝑊) of a body?

• The body floats

• The body sinks

• The body remains stationary

• The body bounces

Why does a cork float with only a small portion submerged in water?

• Its weight is greater than the upthrust

• Its upthrust equals its weight

• Its density is less than water

• Its volume is too large

What increases the upthrust on a body submerged in a fluid?

• Decreasing the volume submerged

• Increasing the volume submerged

• Decreasing the fluid density

• Increasing the body’s weight

What if you pushed an empty can deeper into water—what would happen to the upthrust?

• It would decrease

• It would stay the same

• It would increase

• It would become zero

What if a balloon filled with hydrogen is released in air—will it rise or sink?

• Sink

• Rise

• Stay stationary

• Bounce

What if the density of the fluid around a floating cork increases—how will it affect the cork?

• It will sink

• It will float higher

• It will stay the same

• It will break

Where does the upthrust act on a submerged body?

• At the top

• At the center of buoyancy

• At the bottom

• At the sides

Why does a pebble fall faster than feathers in air according to the text?

• Pebbles have more weight

• The upthrust on pebbles is less than on feathers

• Feathers have more density

• Pebbles displace more air