Physics Y9

How do you Calculate Pressure

• Force(N)/Area(m²)

• Force(kg)/Area(mi²)

• Area(m²)/Force(N)

Why won't you sink in mud if you wear boots?

• Because the surface area is larger creating less pressure.

• Because the mud won't want you

• Has air in it to keep you floating.

What is pressure?

• The amount of force exerted on a surface

• The weight of an object

• The surface area of an object

When you increase your depth under water, the water pressure on your body

• increases

• stays the same

• decreases

What pressure does a 4000N horse exert on the ground if each foot is 10cm²?

• 400 N/cm²

• 40 N/cm²

• 100 N/cm²

• 10 N/cm²

Buoyancy is the tendency for objects to float in a fluid. Buoyancy pushes the opposite direction of...

• waves push.

• the wind.

• magnetic pull.

• gravity's pull

Car brakes and car jacks are examples of

• hydraulic systems

• atmospheric pressure

• archimedes' principle

• buoyancy

In gases, pressure is

• directly proportional to volume

• inversely proportional to volume

• inversely proportional to heat

• directly proportional to friction

Gas pressure is caused by

• Gas molecules heating up

• Gas molecules reacting with other gas molecules

• Gas molecules hitting the walls of a container

• Gas molecules hitting other gas molecules

The temperature of gas is held constant, while its volume is decreased. The pressure exerted by the gas on the wall of the container increases, because its molecules

• Strike the walls with higher velocities

• Strike the walls with large farce

• Strike the walls more frequently

• Are in contact with the walls for a shorter time