Week 4 Assessment: Forces in Fluids and Buoyancy

What is a fluid?

• A solid that floats

• Any substance that flows

• Only water

• Only gases

Which of the following is NOT a fluid?

• Air

• Oil

• Ice

• Water

What is buoyancy?

• Downward pull on a floating object

• Sideways force from wind

• Upward force from a fluid on an object

• Force from gravity

What does Archimedes’ Principle state?

• Buoyant force equals the object's weight

• Density equals mass times volume

• Force equals mass times acceleration

• Buoyant force equals the weight of the displaced fluid

If an object sinks in water, it means:

• It weighs more than the water

• It has no volume

• It is less dense than water

• It is more dense than water

What is the formula for density?

• D = m x v

• D = v + m

• D = m ÷ v

• D = m + v

Which of these would likely float in water?

• A. A rock

• B. A metal bolt

• C. A rubber duck

• D. A coin

What happens when an object displaces more fluid than its weight?

• It sinks

• It floats

• It disappears

• It creates bubbles

What unit is commonly used for fluid pressure?

• Meters

• Pascals (Pa)

• Watts

• Kilograms

Which of the following is a real-life example of buoyancy in action?

• A. A magnet attracting metal

• B. A sponge soaking up water

• C. A ship floating on the ocean

• D. A parachute slowing a fall