SS2: PHYSICS  1ST TERM

Scalars & Vectors  Week 15 Topics1 Quiz

Equations of Motion  Week 23 Topics1 Quiz

Projectile  Week 35 Topics

Equilibrium of Forces I  Week 44 Topics

Equilibrium of Forces II  Week 54 Topics

Stability of a Body  Week 64 Topics1 Quiz

Simple Harmonic Motion (SHM)  Week 74 Topics

Speed, Velocity & Acceleration & Energy of Simple Harmonic Motion  Week 85 Topics1 Quiz

Linear Momentum  Week 96 Topics1 Quiz

Mechanical Energy & Machines  Week 102 Topics1 Quiz
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Conservation of Linear Momentum
The law of conservation of linear momentum states that for a closed or isolated system of colliding bodies the total momentum remains constant, provided no external forces act.
OR
If two or more bodies in a closed or isolated system collide, their total momentum before collision is equal to their total momentum after collision provided no external forces act.
A Closed / Isolated System:
A closed or isolated system means a system in which no external force acts. Or it is a system in which there is no interference by any external factor.
Different Cases Of Collision:
If masses, M_{1}, and M_{2}, moving in the same direction with initial velocities U_{1} and U_{2}, respectively, collide with each other and move in different directions
From conservation of linear momentum, the total momentum before collision is equal to the total momentum after collision; therefore,
M_{1}U_{1 }+ M_{2}U_{2} = M_{1}V_{1 }+ M_{2}V_{2}
When two bodies moving in opposite directions collide,
M_{1}U_{1 }– M_{2}U_{2} = M_{1}V_{1} + M_{2}V_{2}
When a stationary body collides with a moving body, and move apart.
M_{1}U_{1 }– 0 = M_{1}V_{1} + M_{2}V_{2}
If two bodies collide with each other, and stick together, and move with common velocity.
M_{1}U_{1 }+ M_{2}U_{2} = (M_{1} + M_{2})V
V is the common velocity of the body.
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