Momentum. The p = m = mass v = velocity Unit: Vector Direction of momentum is determined by the direction of the.

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Presentation transcript:

Momentum

The p = m = mass v = velocity Unit: Vector Direction of momentum is determined by the direction of the

Momentum Newton’s 2 nd Law of Motion in terms of momentum Net External Force = time rate of change of External to the system

Momentum

Impulse I = F= force ∆t = change in time

Impulse - Problems Find the change in momentum 2 kg 5 m/s 3 m/s +- If ∆t = s, find the average force the wall exerts on the ball

Momentum If no external unbalanced forces, so Conservation of momentum for a system w/ no external in forces

Examples 5 kg10 kg Before 5 kg10 kg After

Examples 5 kg10 kg Before 5 kg 10 kg After

Examples 5 kg 10 kg After 5 kg10 kg Before

Examples 5 kg10 kg Before 5 kg10 kg After

Types of Collisions Elastic Collisions – Kinetic energy is KE i = KE f Inelastic collision – Some kinetic energy is lost Typically lost to friction, sound, deformation, etc. Most collisions in “real life”

Types of Collisions How can you determine the type of collision? Yes Elastic No KE i > KE f Inelastic NOTE: As long as, momentum is conserved in every type of collision

Examples m a = 4 kg Before m b = 6 kg After m a = 4 kg m b = 6 kg Is it Elastic or Inelastic?

Skills Needed for Test Calculate the momentum of an object Determine and understand Impulse/ Δ P Understand and apply the conservation of momentum (P Total, i = P Total, f ) to various situations/collisions Determine and verify whether a collision is elastic or inelastic Understand collisions in 1 & 2 dimensions An understanding of previous topics (conservation of energy, motion, etc.)