Which two forces act on an object in water?

• gravity

• friction

• weight

• upthrust

What happens if the weight of an object is equal to or less than the upthrust?

• It floats

• It sinks

• It spins

• It explodes!

What is the scientific word for 'floating'

• levitating

• suspended

• buoyancy

• hovering

What happens if the weight of an object is greater than the upthrust?

• it floats

• it sinks

• it bounces

• it vibrates

Army tank tracks are useful for travelling through the mud because..

• they decrease the force the vehicle exerts on the ground
• they increase the force the vehicle exerts on the ground
• they decrease the pressure the vehicle exerts on the ground
• they increase the pressure the vehicle exerts on the ground

Where would you find the largest pressure?

• At the bottom of the ocean

• At the top of Mt Everest

• Close to ground in Cuckfield

• In a rockpool on the Great Barrier Reef

The amount of force pushing on an area is the definition of....

• Fluid
• Viscosity
• Barometer
• Pressure

Look at the pressure triangle. How do we calculate the area?

• f ÷ a
• f x p
• p x f
• f ÷ p

Pressure is measured in what units

• Newtons
• m/s
• Pascals
• Moles

Pressure can be measured in Pascales (Pa) or Newtons per square metre.
1 Pa = 1N/m2

• True
• False