L5 - Impulse and Momentum

What are the 2 equations for impulse?

Impulse (P) = force x time

Impulse = (mass x final velocity) - (mass x initial velocity)

What is the sum value of impulse during impact?

0 - the 2 impulses cancel as one is negative and the other is positive

What is the equation for the conservation of linear momentum?

(mass₁ x initial velocity) + (mass₂ x initial velocity) = (mass₁ x final velocity) + (mass₂ x final velocity)

m₁u₁ + m₂u₂ = m₁v₁ + m₂v₂

What must happen for a collision?

u₁ must be larger than u₂

For bodies to separate after impact, what must the final velocities be relative to each other?

v₂ must be greater than v₁

What is the equation for Newton’s experimental law?

Velocity of separation = e x velocity of approach

(v₂ - v₁) = e x (u₁ - u₂)

e is a constanr coefficient

When happens when e = 1?

There is a rebound to the same height the body fell from and no energy is lost

What happens when e = 0?

There is no rebound at all and all of the energy is lost