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Momentum Class 9

Momentum:

Product of mass and velocity of a body is called momentum.

Momentum (p) = Mass (m) x Velocity (v)

Momentum is a vector quantity. It’s direction is same as that of velocity.

SI Unit of Momentum is kg m / s.

Momentum Class 9

Graph between momentum and velocity:

  • For a constant mass body, its momentum is directly proportional to the velocity of the body.
  • p ∝ v
  • Greater is the velocity of body greater will be its momentum.
  • Slope of momentum Vs velocity graph represents mass of body.

Force and laws of motion 🖱️👉 NCERT in-text questions solution

Relation between Kinetic energy and momentum:

Expression for KE (K) = ½ mv2

Momentum p = mv ⇒ v = p/m

Putting value of v in KE formula

(K) = ½ mv2 = ½ m (p/m)2 = ½ (p)2/ m

2mK = p2

or  p = √(2mk) This is the relation between KE and Momentum.

QUIZ-1 Force and Laws of Motion 🖱️👉 START

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