Science Atmosphere Buoyancy & Pressure

Assume you have an ice cube and also a small rock that is the same size and shape as the ice cube. Predict what would happen if you placed the ice cube and rock in a glass of water.

• The ice cube and rock will both float.

• The ice cube will sink and the rock will float.

• The ice cube will float and the rock will sink.

• The ice cube and rock will both sink.

A fluid exerts pressure only in an upward direction.

• True

• False

_____ force is an upward force that fluids exert on any object that is placed in them.

• Buoyant

• Gravity

• Torque

The amount of mass in a given volume of a substance is its _____.

An object floats in a fluid when the buoyant force acting on the object is

• acting above the object.

• less than the object’s weight.

• acting under the object.

• equal or greater than the object’s weight.

A denser substance will...

• become more dense in a less dense fluid.

• become less dense in a less dense fluid.

• float on a less dense fluid.

• sink in a less dense fluid.

Buoyant force occurs because the fluid below an object exerts greater ____________________ on the object than the fluid above it.

Buoyant force is a/an _______ force that fluids exert on any object that is placed in them.

• Upward

• Downward

By adjusting their density submarines can control their buoyancy and sink or rise in water.

• True

• False

If a body weighs 600 N in the air but appears to only weight 450 N when completely immersed in water, then the upthrust on the body by the water is _____ .

• 600 N

• 450 N

• 1050 N

• 150 N

Tags

NGSS.MS-PS2-2