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.
explain that motion in a curved path is due to a perpendicular force on a body that changes direction of motion but not speed.
calculate centripetal force on a body moving in a 2circle using mv /r.
state what will happen to you while you are sitting inside a bus when the bus
(i) starts moving suddenly
(ii) stops moving suddenly
(iii) turns a corner to the left suddenly
write a story about what may happen to you when you dream that all frictions suddenly disappeared. Why did your dream turn into a nightmare?
9th Physics Notes
9th Physics Chapter 3
Class IX Helping Notes
Matric Part-1 Notes
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