PRESSURE

WHAT IS PRESSURE?

• Related to the word "press".
• Earth's gravity pulls downward.

EXAMPLES OF PRESSURE

• Sucking threw a straw
• A car tire holding the weight of a car
• Bullet fired from a gun
• Toy balloon inflated

PRESSURE AND AREA

• The larger area is, the less pressure is exerted
• Pressure = Force / Area
• Measured in Pascals or 1 N/m ²

FLUID PRESSURE

AN EXAMPLE OF FLUID PRESSURE

• When a water wheel is turning.

AIR PRESSURE

AN EXAMPLE OF AIT PRESSURE

• An inflated balloon

BALANCED PRESSURE

AN EXAMPLE OF BALANCED PRESSURE

• Canned food

VARIATIONS IN FLUID PRESSURE

• Atmospheric Pressure and Elevation.
• Popping in ear is caused by changing air pressure
• Atmospheric pressure decreases as your elevation increases
• Water Pressure and Depth
• Water pressure increases as depth increases.

MEASURING PRESSURE

DENSITY

• If object is more dense than fluid - it sinks (obviously!)
• If object is less dense than fluid - it floats. (no, duh...)
• Density = Mass / Volume

AN EXAMPLE OF DENSITY

• A cruise ship

BUOYANCY

• Buoyancy is the ability to float.
• Buoyant force is when water and other fluids exert an upward force.
• The less dense the object is, the greater the buoyant force it experiences.

AN EXAMPLE OF BUOYANCY

• A cork in water

ARCHIMEDES PRINCIPLE

PASCAL'S PRINCIPLE

BERNOULLI'S PRINCIPLE

CREDITS

• http://middleschoolnotes.org/science/physical-science/outlines/chapter-11-f...