(Savvas Unit 6/7 Ch's 11, 12, & 13) Forces and Fluids

Buoyancy is the ability of an object to:

• sink in water

• float in a fluid

• dissolve in a liquid

• absorb water

In which direction does a buoyant force act?

• in the direction of gravity

• perpendicular to gravity

• in the direction opposite of gravity

• from above the fluid

Is the following sentence true or false? The greater a fluid’s density, the greater its buoyant force.

• True

• False

Buoyancy causes an apparent _______________ of weight of an object immersed in a fluid.

• loss

• increase

• stability

• gain

Circle the letter of each sentence that is true about buoyancy concerning an object that is able to float on the surface of a liquid.

• Forces pushing up on a completely submerged object are greater than the forces pushing down on it.

• Forces acting on the sides of a submerged object cancel each other out.

• Gravitational forces work in opposition to the buoyant forces.

• The net buoyant force is in the downward direction.

According to Archimedes' principle, the weight of fluid displaced by a floating object is equal to the ____________ acting on that object.

• buoyant force

• gravitational force

• surface tension

• frictional force

Is the following sentence true or false? When an object floats partially submerged in a fluid, it displaces a volume of fluid equal to the object's total volume. True or False?

• True

• False

Use what you know about density and buoyancy to predict whether each of the substances listed in the table will float or sink in water. The density of water is 1.0 g/cm³. Which of the following substances will sink in water?

• Gold

• Balsa Wood

• Brick

• Milk

Tags

NGSS.MS-PS1-2

How is a heavy steel ship able to float?

• Because the density of steel is 7.8 g/cm³.

• The ship’s shape enables it to displace a large volume of water.

• Because the density of water is 1 g/cm³.

• The ship’s effective density is greater than that of water.

What is the ability or tendency to float in water, air or some other fluid called? (a)  

• Buoyancy
• Density
• Archimedes Principle
• Rate of Decent