SS2: PHYSICS - 1ST TERM
Scalars & Vectors | Week 15 Topics|1 Quiz
Equations of Motion | Week 23 Topics|1 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 Topics|1 Quiz
Simple Harmonic Motion (SHM) | Week 74 Topics
Speed, Velocity & Acceleration & Energy of Simple Harmonic Motion | Week 85 Topics|1 Quiz
Linear Momentum | Week 96 Topics|1 Quiz
Mechanical Energy & Machines | Week 102 Topics|1 Quiz
Do you like this content?
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.
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, M1, and M2, moving in the same direction with initial velocities U1 and U2, 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,
M1U1 + M2U2 = M1V1 + M2V2
When two bodies moving in opposite directions collide,
M1U1 – M2U2 = -M1V1 + M2V2
When a stationary body collides with a moving body, and move apart.
M1U1 – 0 = M1V1 + M2V2
If two bodies collide with each other, and stick together, and move with common velocity.
M1U1 + M2U2 = (M1 + M2)V
V is the common velocity of the body.