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5 Cards in this Set

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Pellet of mass 8.8 g hits stationary block of 450g and causes it to rise 0.63m. Work out velocity of pellet.

1. Work out energy gained; mgh (pellet + block)


2. Equate energy gained to KE of block + pellet; mgh = 1/2 mv^2; work out v


3. Mom. Lost pellet = mom. gain block;


V x m(pellet + block) = m(pellet) x v


4. Substitute and work out V of pellet


Conservation of momentum cases

Mom. Before collision = mom. After


Mom lost by pellet = mom gain by block


Impulse is a vector or scalar

SCALAR (CANNOT BE NEGITIVE)

If projectile is fired into the air, and subsequently hits ground, is acceleration ever zero.

Acceleration will only flip between -9.81 and 9.81

What is impulse?


Difference between impulse and Force

The change in momentum (regardless of time)


Force is equal to the rate of change of momentum or impulse per unit time