Pressure in Solid, Liquid and Gas_G7

Pressure in Solid, Liquid and Gas_G7

by Irvani Prasanti

​LEARNING OBJECTIVES :

1. R​ecognise that forces can cause pressure on an area

2. ​Understand what affects pressure

3. ​Be able to calculate the pressure caused by a force on an area

4. ​Recall how particles move in liquids and gases

5. ​Understand how particle movement causes pressure in liquids and gases

6. Predict how changes in liquids and gases affects the pressure

7. Describe how random movement of particles causes diffusion

8. ​Understand how diffusion happens in liquids and gases

​Formula of Pressure

Multiple Choice

What is pressure?

• The amount of force exerted on a surface

• The surface area of an object

• The weight of an object

Multiple Choice

If you're walking in snow why would you wear boots instead of high heels?

• Because boots have a higher surface area making the pressure less and stopping you from sinking.

• Because it's more comfortable

• No, high heels are better

Multiple Choice

What is the equation used to calculate pressure?

• pressure= force/mass

• pressure =mass/volume

• pressure=area/force

• pressure=force/area

Multiple Choice

Which of these animals would probably cause the greatest pressure on the ground?

• A fat cow with big feet

• A fat cow with small feet

•  A calf with big feet

• A calf with small feet

Multiple Choice

Which situation produces more pressure on the floor?

• standing on one foot

• standing on two feet

• standing on four feet

• all produce the same pressure

Multiple Select

A person weighs 700N and their feet have a surface area of 0.1m². How much pressure is exerted?

• 7000N/m²

• 70N/cm²

• 100N/m²

​At fixed container, when temperature increases then pressure increases.

Multiple Choice

The pressure exerted by a liquid

• increases with depth.

• decreases with depth.

• is constant

• first increases and then decreases.

Multiple Choice

The diagrams show, to the same scale, the vertical sections of a set of circular vessels, each containing the same depth of water.

• The water exerts the same pressure on the base of each vessel.

• The water exerts the greatest pressure on the base of vessel S.

• The water exerts the greatest pressure on the base of vessel P.

• The water exerts the same force on the base of each vessel.

Multiple Choice

Diagram shows the design of a dam. Why does the thickness of the dam increase with its depth?

• The design of this structure is stronger.

• Water pressure increases with depth.

• The cost of construction is lower.

• Water pressure acts uniformly in all directions.

Multiple Choice

If a hairspray can is heated, what can be expected of the pressure of the gas inside the can?

• The pressure will increase

• The pressure will decrease

• The pressure will remain constant

• The pressure will equalize

Multiple Choice

In what direction(s) does air exert pressure?

• everywhere

• no where

• there is no pressure

• downward

Multiple Choice

The pressure inside the balloon will:

• Decrease

• Increase

• Remain the same

• Not enough information to formulate an answer

Multiple Choice

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

​Speed of diffusion in gases > in liquid > in solid.

​Higher temperature, the faster the diffusion.

Multiple Choice

The picture  is an example of _________________.

• isotonic

• diffusion

• osmosis

• active transport

Multiple Choice

Diffusion is the movement of molecules from an area of _____ concentration to an ______ concentration

• High, low

• Low, high

• Low, low,

• High, high

Multiple Choice

Where is there a low concentration of dye?

• at the bottom of cup

• in the color

• at the top of cup 

• no concenteraion gradient

Multiple Choice

Which diagram best shows the end result of diffusion?

• F

• G

• H

• J

Multiple Choice

Which of the following will diffuse the fastest?

• A tablespoon of sugar in a glass of water

• Heat through a solid piece of steel

• A pinch of salt in a glass of water

• The smell of bacon cooking throughout a room

​THANKS

​Any Questions ?