9th Class Physics Notes For Chapter 3 PDF [ Dynamics ]

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SLOs of  9th Class Physics Notes For Chapter 3

•  Define momentum, force, inertia, friction, and centripetal force. 
• Solve problems using the equation Force=change in momentum/change in time.
•  Explain the concept of force with practical examples of daily life.
•  State Newton’s laws of motion. Distinguish between mass and weight and solve problems using F= ma, and w = mg. 
• Calculate tension and acceleration in a string during the motion of bodies connected by the string and passing over a frictionless pulley using the second law of motion. 
• State the law of conversation of momentum. 
• Use the principle of conservation of momentum in the collision of two objects. 
• Determine the velocity after the collision of two objects using the law of conversation of momentum. 
• Explain the effect of friction on the motion of a vehicle in the context of tyre surface, and road conditions including skidding, and braking force.
•  Demonstrate that rolling friction is much lesser than sliding friction. List various methods to reduce friction. 
• Explain that motion in a curved path is due to a perpendicular force on a body that changes the direction of motion but not speed. 
• Calculate the centripetal force on a body moving in a circle.
• State what will happen to you while you are sitting inside a bus when the bus

1. Starts moving suddenly
2. Stops moving suddenly
3. Turns a corner to the left suddenly

• Write a story about what may happen to you when you dream that all friction suddenly disappeared. Why did your dream turn into a nightmare?