The fun never stops...The fun never stops...

•Liquids and Gases can exert forces.

– Examples: waves crashing, wind

•Liquids and Gases can exert forces.

– Examples: waves crashing, wind

•Liquids and Gases can exert forces.

– Examples: waves crashing, wind

•Liquids and Gases are fluids

•Liquids and Gases can exert forces.

– Examples: waves crashing, wind

•Liquids and Gases are fluids

•Liquids and Gases can exert forces.

– Examples: waves crashing, wind

•Liquids and Gases are fluids

•Fluids exert force

•Liquids and Gases can exert forces.

– Examples: waves crashing, wind

•Liquids and Gases are fluids

•Fluids exert force

Objects in a fluid experience a buoyant force resulting from the pressure exerted by the fluid.

Objects in a fluid experience a buoyant force resulting from the pressure exerted by the fluid.

Objects in a fluid experience a buoyant force because of the pressure of the fluid.

Objects in a fluid experience a buoyant force because of the pressure of the fluid.

• Pressure is the force per unit of area applied on the surface of an object.

• Pressure is the force per unit of area applied on the surface of an object.

• Pressure is the force per unit of area applied on the surface of an object.

• Pressure depends on the force applied, and the area of contact over which the force is applied.

• Pressure is the force per unit of area applied on the surface of an object.

• Pressure depends on the force applied, and the area of contact over which the force is applied.

1 Pa = 1 N/m2

1 Pa is equal to the force of 1 Newton applied over an area of 1 m2

• For any fluid, pressure depends only on the height of the column of fluid above the surface.

• For any fluid, pressure depends only on the height of the column of fluid above the surface.

• For any fluid, pressure depends only on the height of the column of fluid above the surface.

• Increasing the height of the column of fluid increases the pressure.

• For any fluid, pressure depends only on the height of the column of fluid above the surface.

• Increasing the height of the column of fluid increases the pressure.

• Pressure increases with depth.

• Pressure increases with depth.

• Pressure increases with depth.

• The water column pushing down becomes taller and heavier with increasing depth.

• Pressure increases with depth.

• The water column pushing down becomes taller and heavier with increasing depth.

• Fluids exert a pressure in all directions on an object.

• The pressure is perpendicular to the surface of the object.

• Fluids exert a pressure in all directions on an object.

• The pressure is perpendicular to the surface of the object.

• Atmospheric pressure is the force exerted per unit area by air particles.

• Atmospheric pressure decreases as elevation increases.

Atmospheric Pressure Crushing things:http://www.youtube.com/watch?

v=L2WDF1lu5Ochttp://www.youtube.com/watch?

v=gG5YmkmfCpAhttp://www.youtube.com/watch?v=Uy-

SN5j1ogkhttp://www.youtube.com/watch?

v=2WJVHtF8GwI

Buoyant force is the upward force on an object in a fluid exerted by the surrounding fluid.

Buoyant force is the upward force on an object in a fluid exerted by the surrounding fluid.

• Buoyant force is the result of increasing pressure at increasing depth.

• Pressure on the top of the object is less than the pressure on the bottom of the object, resulting in an unbalanced force.

• Buoyant force is the result of increasing pressure at increasing depth.

• Pressure on the top of the object is less than the pressure on the bottom of the object, resulting in an unbalanced force.

• The pressure exerted by a fluid increases as depth increases.

• The buoyant force remains constant on a submerged object.

• The pressure exerted by a fluid increases as depth increases.

• The buoyant force remains constant on a submerged object.

• Archimedes’ principle, the buoyant force on an object is equal to the weight of the fluid the object displaces.

• Archimedes’ principle, the buoyant force on an object is equal to the weight of the fluid the object displaces.

• The buoyant force does not depend on the object’s density or weight.

• The buoyant force does not depend on the object’s density or weight.

• If the upward buoyant force is less than the object’s weight, the net force on the object is downward.

• If the upward buoyant force is less than the object’s weight, the net force on the object is downward.

• Overall density of the ship is less than the density of water because a large volume of the ship is filled with air.

• Overall density of the ship is less than the density of water because a large volume of the ship is filled with air.

• Air produces a buoyant force.

• Helium balloon’s weight is less than the buoyant force.

• Air produces a buoyant force.

• Helium balloon’s weight is less than the buoyant force.

• The density of the balloon is less than the density of the surrounding air.

• Hot-air balloons float when their weight is less than the weight of displaced air.

• Heat from the burner heats the air particles and causes them to move farther apart.

• Hot-air balloons float when their weight is less than the weight of displaced air.

• Heat from the burner heats the air particles and causes them to move farther apart.

• The density of the balloon decreases and becomes less dense than the surrounding air.

VideosMythbusters "Let's Talk Buoyancy"http://science.howstuffworks.com/6540-mythbusters-

lets-talk-buoyancy-video.htm

Mythbusters Lead balloon 5 minhttp://www.youtube.com/watch?v=HZSkM-QEeUg

Mythbusters Barrel of Brickshttp://www.youtube.com/watch?v=Vt230Pd1oSo

Sulfur Hexafluoride Gas Boat floathttp://www.youtube.com/watch?v=ckaJs_u2U_A

Mythbusters Sulfur Hexafluoride Boat float attempthttp://www.youtube.com/watch?v=KReTvW7BTHQ