Question

Self made Notes of Ch - Force and laws of motion class 9

Answer 1

hello __:)
what is force!?
a push or pull is defined as force

what is balanced force ?
the resultant force acting on the bdy is zero then the forces are called balanced force

What is unbalanced force!!
when the resultant force acting on the body is not zero!!

✌force is. a vector quantity!!

newton first law of motion!!
the object will remain at rest or in uniform motion along a straight line unless and until compelled by external force

what is inertia!!
the tendancy of an object to remAin at rest or in uniform motion along a straight line unless and until compelled by external force

what is momentum?
the measure of quantity of motion
momentum (p) = mass (m) * velocity (v)
it depends on two things
1..on mass
2..on velocity

newton second law
the force acting on a body is obtained by multiplying its mass and acceleration

it also states that force is directly proportional to rate change of momentum/time taken

acceleration depends on mass and force
acceleration is inversly proportional to mass and directly proportional to force applied

newton third law
every action has an equal and opposite reactin ✌

Law of conservation of momentum
momentum means no change
m1u1+m1u2 = m2v1 + m2v2

Si unit of force is newton!!!
si unit of momentum is kgm/s

Momentum us conserved when no external force are not acting on a body!!!

hoping it helps :)
@trisha __:)

Answer 2

https://www.learncbse.in/force-laws-motion-cbse-notes-class-9-science/

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