Lecture7-2A

# Lecture7-2A - Forces and Motion Newton's Laws Review and...

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Forces and Motion Forces and Motion Newton Newton s Laws s Laws Review Review and and Examples Examples Lecture 7

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p m v

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F d p dt d m v dt m a definition of F

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F net F i 0 p const .

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Example: Airport Runway Example: Airport Runway A fully loaded 747 jumbo jet has a mass of 3.6x10 5 kg . Its four engines can exert a total thrust of F=7.7x10 5 N . How long a runway is required to obtain lift off speed of v=310km/h ? From Newton’s 2 nd the acceleration is The liftoff velocity in m/s is v=310/3.6=86.1m/s. From the kinematic relation between velocity, distance, and acceleration we have: a F / m 7.7 10 5 /3.6 10 5 2.14 m / s 2 v f 2 v i 2 2 a Δ x →Δ x v f 2 /2 a 86.1 2 /4.28 1730 m
Example: Crate on a Truck Example: Crate on a Truck A 280kg crate is secured in a truck with ropes as shown as shown in the figure. Assuming that initially the tension in the ropes is zero, what is tension in the when the deceleration of the truck

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## This note was uploaded on 04/16/2008 for the course PHYS PHYS2A taught by Professor Hicks during the Spring '08 term at UCSD.

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Lecture7-2A - Forces and Motion Newton's Laws Review and...

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