Class 9 Physics Ch 5
Important easy to understand Notes of Class 9 Physics Ch 5 English Medium written by Professor Sulman Arif Suib. These notes are very helpful in the preparation of Physics for students of the 9th class Physics English Medium and these are according to the paper patterns of all Sindh Book Boards.
Summary and Contents:
Topics which are discussed in the notes are given below:
- State and explain Hooke's Law.
- Write two properties of spring.
- Define pressure, give its formula and S.I unit.
- Discuss the factors affecting pressure.
- State Pascal's explain with the help of an example.
- What is the hydraulic machine? Write down the names of four machines that you have seen working on the principle of Pascal's law.
- Describe the construction and working of hydraulic press.
- Define density. Describe density in brief. Give it formula and unit.
- Solved Numerical of the exercise Class 9 Physics Ch 5.
- An elastic spring is 20cm long. When it is secreted by hanging some load its length increases to 60cm. Calculate its extension?
- An elastic spring is 40cm long. When it is secreted by hanging some load its length increases to 80cm. Calculate its extension?
- A spring has spring constant k= 30Nm-1. What load is required to produce an extension of 4m?
- A spring has spring constant k= 50Nm-1. What load is required to produce an extension of 5m?
- How much force is needed to pull a spring to a distance of 30cm, the spring constant is 15Nm-1?
- How much force is needed to pull a spring to a distance of 40cm, the spring constant is 16Nm-1?
- Calculate the pressure at a depth of 3m in a swimming pool? (density of water=1000kgm-3).
- Calculate the pressure at a depth of 6m in a swimming pool? (density of water=1000kgm-3).
- A boy is digging a hole with spade of edge 0.1 cm2. Calculate the pressure when he is exerting the force of 1000N onto the spade.
- A boy is digging a hole with spade of edge 0.2 cm2. Calculate the pressure when he is exerting the force of 3000N onto the spade.
- A wooden block of dimensions 0.5m * 0.6m*1.0m kept on the ground has a mass of 200kg. Calculate the maximum pressure acting on the ground.
- A wooden block of dimensions 0.4m * 0.7m*1.2m kept on the ground has a mass of 150kg. Calculate the maximum pressure acting on the ground.
- If the density of sea water is 1150kgm-3, calculate the pressure on a body of 50m below the surface of sea?
- If the density of sea water is 1950kgm-3, calculate the pressure on a body of 40m below the surface of sea?
- In a hydraulic lift system, what must be the surface area of a piston. If a pressure of 300kpa is used to provide an upward force of 2000N?
- In a hydraulic pressure, a force of 100N is applied on the pump meaning of cross-sectional area 0.01m2. Find the force that compresses a cotton bale placed on larger piston of the cross-sectional area 1m2.
- In a hydraulic pressure, a force of 150N is applied on the pump meaning of cross-sectional area 0.02m2. Find the force that compresses a cotton bale placed on larger piston of the cross-sectional area 1.5m2.
- Calculate the spring constant for a spring which expends by a distance of 0.3cm when a load of 14N is hung from its end.
- Calculate the spring constant for a spring which expends by a distance of 2.5cm when a load of 20N is hung from its end.
- A boy is pressing a humble attack into a place piece of wood with a force of 20N. The surface area of head of thumbtack is 1cm2 and cross-section area of the tip of the thumbtack is 0.01cm2. Calculate the pressure exerted by a boy's thumb on the head of the thumbtack. The pressure of the tip of the thumbtack on the wood.
- A boy is pressing a humble attack into a place piece of wood with a force of 30N. The surface area of head of thumbtack is 2cm2 and cross-section area of the tip of the thumbtack is 0.02cm2. Calculate the pressure exerted by a boy's thumb on the head of the thumbtack. The pressure of the tip of the thumbtack on the wood.