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Write down the Lagrangian for a projectile (subject to no
Chapter 7, Problem 7.1(choose chapter or problem)
Write down the Lagrangian for a projectile (subject to no air resistance) in terms of its Cartesian coordinates (x, y, z), with z measured vertically upward. Find the three Lagrange equations and show that they are exactly what you would expect for the equations of motion.
Questions & Answers
QUESTION:
Write down the Lagrangian for a projectile (subject to no air resistance) in terms of its Cartesian coordinates (x, y, z), with z measured vertically upward. Find the three Lagrange equations and show that they are exactly what you would expect for the equations of motion.
ANSWER:Step 1 of 5
The Lagrangian of the projectile system is given by,
Here, is kinetic energy and is potential energy of the system.
The expression of kinetic energy is given by,
Here, is the mass of the projectile, and is the velocity of the projectile.
The velocity of the projectile in terms of Cartesian coordinates is given by,
Rewrite the equation of kinetic energy as follows.