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Archimedes' Principal says that the buoyant force of an object is equal to

• the weight of the fluid it is in/on.

• the mass of the fluid it is in/on.

• the weight of the fluid it displaces.

• the volume of the fluid it displaces.

Buoyant force acts in the _________ direction of gravity so objects feel lighter.

• same

• opposite

An object will float on water if it is

• less dense than water.

• more dense than water.

• the same density as water.

An object will sink in water if it is

• less dense than water.

• more dense than water.

• the same density as water.

Which word best describes the force from a liquid acting on a floating object?

• Weight

• Upthrust

• Water resistance

• Friction

When an object is floating in water, the object's weight and the upthrust of the water are ________ .

• balanced

• unbalanced

• zero

• dependent on other things

Objects in water feel _______ than in the air.

Hint: think of the upthrust in water compared to the upthrust in air and then the resultant force

• the same

• heavier

• 'weightless'

• lighter

Bobby's blue bowling ball weighs 70N. Bobby puts his bowling ball in jelly (upthrust = 0.064N), will the bowling float or sink?

• Float

• Sink

Select all the forces acting on a pair of glasses sinking in water.

• Weight of the glasses

• Air resistance

• Upthrust

• Explosions

• Light diffraction

What causes water to be displaced or pushed out of the way when an object is on water?

• Tension

• Friction

• Upthrust

• Gravity