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Lecture 8

# Lecture 8 - Chapter 7 Momentum also Intro to Rotational...

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Chapter 7 – Momentum also Intro to Rotational Motion Today : Hand in Homework #3 Pickup Homework Assignment #4 Pickup graded homework and quizzes Today’s Topics : Finish Chap 7 Momentum and Impulse Momentum Conservation Intro to Chap 8 Rotational Inertia

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Conservation of Momentum Newton’s 2 nd & 3 rd Laws F = ma = dp/dt “If the net external force acting on a system is zero, the total momentum is conserved.” examples: Flying projectile explodes fireworks (except for gravity) multiple warhead missile, rocket propulsion initially afterwards If no external forces , traveling at v = constant, Call the forces between the pieces of the projectile internal forces . by Newton’s 3 rd Law: internal forces act in equal and opposite pairs These internal forces balance to zero (Before and After explosion) Internal forces produce no net change in momentum! Explosions conserve momentum “pow”