Physics 10 grade Paskal's law Lesson plan

Long-term plan unit:  

Fluid kinematics

School:

Date:

Teacher name:  

Grade:  10

Number present:

absent:

Theme of the lesson   

Communicating vessels. Application of Pascal’s law. Torricelli's experiment. Atmospheric pressure.

Learning objectives that are achieved at this lesson

·         - description of the Pascal’s  law and its application;

·         - Interpretation of term "Hydrostatic pressure"

Lesson objectives

·         to describe the Pascal’s law and its application;

·          to explain the term of hydrostatic pressure;

Language

objectives

Students to use the following terms:

pressure, liquid, pressure difference,  

communicating vessels,  atmosphere pressure

Cross-curricular

 links

Maths,

ICT skills

internet

Previous learning

G7 pressure; Archimedes principle.

Course of the lesson

Planned stages of the lesson

Planned activities at the lesson

Resources

Beginning

1 min

(T) Teacher introduces the lesson and  discusses the general objectives and learning outcomes expected in the lesson

5 min

(T,W)  Explanation of new topic

Pressure is defined as the (perpendicular) force per unit area.

The SI unit of pressure is the Pascal (Pa).

1 Pascal is the pressure applied by 1 Newton of force pushing over an area of

Liquids (in equilibrium) transmit pressure equally in all directions.

This statement is known as Pascal’s principle.

Liquid pressure is perpendicular to the surfaces of the container.

Variation of liquid pressure with depth

 – pressure (Pa)

 – density of liquid ()

 – depth (m)

Hydrostatic paradox

The proposition in hydrostatics that any quantity of water, however small, may be made to counterbalance any weight, however great; or the law of the equality of pressure of fluids in all directions

Atmospheric pressure is the pressure exerted by the weight of the gases in the atmosphere. The atmosphere is continuously “pushing down” upon all things on Earth, including Earth’s surface.

Pressure has units other than Pascal. Two of them (generally used in chemistry) are:

•      the atmosphere (atm) 

•      centimeters of mercury (cm-Hg)

Power point presentation

Pascal’s principle:

https://www.youtube.com/watch?v=tAyFKf7zxFg

Torricelli experiment

https://www.youtube.com/watch?v=drI0d6An84g

2 min

(I)                Problem solving

At constant atmospheric pressure the water column height is 10.3 m. How can you calculate the height of the remaining fluid in the remaining two tube?

Power point presentation

15 min

(G) Group work “ Working with text”

Study the material and present to the class

Group № 1

Torricelli's Experience 1. General in his practice Torricelli used a glass tube 1 meter long, fixed at one end. The tube fill with mercury this open edge closed with your finger while standing, cast ten wide mercury in the container. After you remove your finger, all the mercury from the vessel does not overflow. Question: why hasn't all the mercury spilled? 2. The height of the remaining mercury column in the pipe was 760 mm. what conclusions can be drawn from this result? 3. Does the height of the class pole depend on the air temperature and latitude? 4. Offer a simple tool for measuring atmospheric pressure.

Group № 2

Learn how the hydraulic press works and answer the following questions: 1. General provisions what is called a hydraulic press? 2. What is the design of the hydraulic press? 3. Explain that the hydraulic press gives a powerful gain based on Pascal's law. 4. Explain the principle of operation of the hydraulic Jack and hydraulic brake.

Group № 3

Familiarize yourself with the working principle of the piston pump and answer the following questions: 1. General provisions What is the device the piston of a fluid pump? 2. What is the operating principle of the piston liquid pump? 3. What is the principle of operation of water supply? Conclusion: The principle of operation of the piston liquid pump is based on the lifting of the liquid into the pressure reduction zone when lifting the piston under the influence of atmospheric pressure.

Worksheet

Worksheet

Worksheet

8 min

(E) Experiment

Put the glass Cup into water, turn it under water and fill with water, slowly lift. Why won't the water spill until the edge of the glass comes out of the water?

2) fill the glass with water, cover its surface with one sheet of paper. Hold the sheet by hand and quickly flip the Cup. Now explain that when you receive the hand, the water will not spill.

3) Why can't the atmospheric pressure be considered as the water column pressure?

5 min

(W) Effect of atmospheric pressure

Explanation of the effects of atmospheric pressure

Power point presentation

End

3 min

At the end of the lesson, learners reflect on their learning:

-       What has been learned

-       What remained unclear

-       What is necessary to work on

-       Home work

reflection