Year 8: Pressure

A fluid is a substance that can flow.

Which states of matter are classed as fluids?

• Solid

• Liquid

• Gas

What causes gas pressure to increase?

[Select 3 options]

• Increase in volume

• Increased amount of gas particles

• Increase in temperature

• Decrease in volume

• Decrease in temperature

What happens if the weight of an object

in water is equal to the upthrust from the water?

• The object sinks.

• The object floats.

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

• The object sinks

• The object floats

What is the name of the resistive force that a solid object experiences as it moves through water?

• upthrust

• water resistance

• thrust

Three balls are placed into the water. Which of these balls will float?

• A

• B

• C

Two balls with the same volume are placed

into the water. Why does ball B sink?

• Ball B has a lower density,

  so it weighs more than ball A.

• Ball B has a greater density,

  so it weighs less than ball A.

• Ball B has a lower density,

  so it ways less than ball A.

• Ball B has a greater density,

  so it weighs more than ball A.

A fluid exerts pressure on its container.

What direction does fluid pressure act in?

• in all directions

• up

• down

• left and right

How does pressure in a fluid

vary with depth?

• The greater the depth, the higher the pressure.

• The greater the depth, the lower the pressure.

Why is there more water pressure on Cassie than there is on Hannah?

• There is more water above Cassie.

• Cassie must weigh more than Hannah.