pressure
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This document discusses the concept of pressure. It defines pressure as the force exerted on a surface per unit area. It presents the mathematical formula for pressure (P=F/A) and gives examples of its application. These include how pressure allows nails and ice skates to pierce or glide smoothly by concentrating force over a small area. The document also provides sample pressure problems and activities for students to solve.
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Date: May 29, 2024
Tags: Information Security, ISO/IEC 27001, ISO/IEC 42001, Artificial Intelligence, GDPR
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pressure
- 2. Video
- 3. Activity
- 5. Rationale Its important to study pressure , wind blows due to difference in pressure, pressure phenomenon is used in hydraulics, as we all know hydraulics system is used in cranes, steering wheels, bicycle pumps, shock absorbers, breaking system of cars and also used in pressure cookers as well.
- 6. Desired Learning Objectives At the end of this lesson students will be able to: Define pressure Elaborate the relationship between pressure, force and area Apply the mathematical formula to solve the numerical problems
- 7. Definition Pressure is an expression of force exerted on a surface per unit area.
- 8. Mathematical Expression P=F/A Where P=Pressure F=Force A=Area on which pressure is applied
- 9. Unit P=F/A P= newton/meter Square P=N/m2 or Pascal
- 10. Quantity Pressure is a scalar quantity as we need only magnitude not direction.
- 11. Activity
- 12. What will happen if you hammer pointed side and try to pierce flat side of the nail?
- 13. Why a wide steel belt is provided over the wheels of the army tanks?
- 14. What hurts more if accidently placed on your foot? Pencil Heel Elephant Foot
- 15. ACTIVITY A force of 1400N acts on a surface area of 10m.m ,find the pressure?
- 16. FACTORS Pressure depends on two factors Force Area
- 17. A sharp knife has a very small surface area on its cutting edge so that highpressure can be exerted to cut the onion.
- 18. The high pressure on surface of the ice so that the ice melts and allowing the ice skater to glide smoothly
- 19. When a force is applied to the head of a nail, the pressure will drive its sharp end into a piece of wood easily.
- 20. The pressure under the studs is high enough for them to sink into the ground, which gives extra grip.
- 21. Skatter have a large area to reduce the pressure on the snow so that they do not sink in too far.
- 22. A tractor moving on soft ground has wide tires to reduce the pressure on the ground so that they will not sink into the ground.
- 23. Pressure 30 A wide shoulder pad of a heavy bag will reduce the pressure exerted on the shoulder of the person carrying the bag.
- 24. Which diagram shows the child exerting least pressure on the ground? Pressure 32
- 25. Activity The elephant weighs 20,000 N stands on one foot of area 0.1m2. How much pressure would it exert on the ground? Solution: P=F/A P=20,000/0.1 =2,00,000N/m2
- 26. Recap 1. Definition of pressure 2. Relationship between pressure, force, and area 3. Mathematical formula for solving numerical related to pressure
- 28. What is the definition of pressure?
- 29. True/False 1. The pressure will decrease if we increase the force. T/F 2. The pressure will increase if we decrease the area. T/F 3. The pressure and Force are inverse related with each other. T/F
- 30. Solve A force of 1200 N acts on the surface of area 10m2 normally. What would be pressure on the surface?
- 31. Homework Solve numerical problem number 7,8 and 9 in the exercise of chapter 7 and submit it tomorrow.
- 32. Resources Punjab text book of 9th class www.physicsfourm.com