phys1441-spring08-040208-post

phys1441-spring08-040208-post - PHYS 1441 Section 002...

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Wednesday, Apr. 2, 2008 PHYS 1441-002, Spring 2008 Dr. Jaehoon Yu 1 PHYS 1441 – Section 002 Lecture #18 Wednesday, Apr. 2, 2008 Dr. Jae hoon Yu Linear Momentum Linear Momentum and Impulse Mid term grade discussions
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Wednesday, Apr. 2, 2008 PHYS 1441-002, Spring 2008 Dr. Jaehoon Yu 2 Announcements • Quiz next Wednesday, Apr. 9 – At the beginning of the class – Covers 6.7 – what we cover next Monday • Mid-term grade discussion today – Please do not miss – If you need to leave quickly after the class, please make sure that you come and meet me early • Colloquium today – Physics faculty research expo
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Wednesday, Apr. 2, 2008 PHYS 1441-002, Spring 2008 Dr. Jaehoon Yu 3 Linear Momentum The principle of energy conservation can be used to solve problems that are harder to solve just using Newton’s laws. It is used to describe motion of an object or a system of objects. A new concept of linear momentum can also be used to solve physical problems, especially the problems involving collisions of objects. p JG Linear momentum of an object whose mass is m and is moving at a velocity of v is defined as What can you tell from this definition about momentum? What else can use see from the definition? Do you see force? The change of momentum in a given time interval p t Δ = Δ G 0 mv t = Δ GG ( ) 0 mv v t = Δ v m t Δ = Δ G F G ma = G 1. Momentum is a vector quantity.
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phys1441-spring08-040208-post - PHYS 1441 Section 002...

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