Pressure [grade 10]

Where would you find the largest pressure?

• At the bottom of the ocean
• At the top of Mt Everest
• Close to ground on the Scotch oval
• In a rockpool on the Great Barrier Reef

Where is pressure the greatest on the dam?

• D
• C
• B
• A

True or false:
Pressure depends on depth

• true
• false

What is altitude?

• how much something weighs
• the distance above sea level
• how big something is
• how far away something is

Air pressure is greatest when near Earth's surface because?

• The air molecules are farther apart.
• The air molecules are closer together.
• Air molecules collide.
• Air molecules are tightly packed.

Air pressure does not crush objects on earth

• because more air pushes down than up
• because gravity keeps air pressure away
• because air pressure pushes in all directions
• because the Earth has an opposing force of gravity

Why is it hard to breath at high altitudes?

• There is too much oxygen in this location.
• There is a higher density of air molecules.
• There is a low density of air molecules.
• The air pressure is greater than at low altitudes.

If density of air is low, pressure is:

• high
• low

If you apply a force to a liquid the forces between the particles _________, And the forces act in __________ of the directions.

• Decreases, None

• Increases, None

• Decreases, All

• Increases, All

\What is the force that keep things afloat in water?

• Gravity

• Friction

• Up-thrust

• Kinetic