Study Online and Download KIPS 9th Class Physics Notes Unit 3: Dynamics. In this unit, you shall study momentum and investigate what causes a change in the motion of a body and what role the mass of a body plays in its motion.
Study Online and Download KIPS 9th Class Physics Notes Unit 3: Dynamics. In kinematics, you have studied the changes in motion only. Our understanding about the changes in motion is of little value without knowing its causes. The branch of mechanics that deals with the study of motion of an object and the cause of its motion is called dynamics. In this unit, you shall study momentum and investigate what causes a change in the motion of a body and what role the mass of a body plays in its motion. This inquiry leads us to the concept of force. You shall also study the laws of motion and their applications.
After studying this unit, the students will be able to:
- 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 by 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 motion of bodies connected by the string and passing over frictionless pulley using 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 collision of two objects using the law of conservation of momentum.
- explain the effect of friction on the motion of a vehicle in the context of tyre surface, road conditions including skidding, braking force.
- demonstrate that rolling friction is much lesser than sliding friction.
- list various methods to reduce friction.
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