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Lecture

# conservation laws and energy from lecture 3

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Department
Astronomy & Astrophysics
Course Code
AST201H1
Professor
Stefan Mochnacki

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Lecture 3- pt 2
Conservation Laws in Astronomy
The total momentum of interacting objects cannot change unless an external
force is acting on them
Interacting objects exchange momentum through equal and opposite forces
Conservation of Angular Momentum
-angular momentum= mass x velocity x radius
angular momentum of an object cannot change unless an external twisting force
is acting on it thus, angular momentum stays constant
ex: increase of radius= decrease of velocity
earth experiences no twisting force as it orbits the sun so orbits and rotation will
continue indefinitely (exception: tidal force with moon)
Energy
-energy makes matter move
-energy is conserved but it can transfer, convert
-total energy: kinetic and potential
Basic types of energy
Kinetic (motion)
Stored or potential
*energy can change type but cannot be created or destroyed [conservation law of
energy]
Thermal Energy
Collective kinetic energy of many particles
Ex: in a rock, in air, in water
Thermal energy is related to temperature but it is NOT the same
Temperature is the average kinetic energy of the many particles in a substance
*lower amount of particles, lower temperature, less movement
-KELVIN, CELSIUS, FAHRENHEIT
www.notesolution.com

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Description
Lecture 3- pt 2 Conservation Laws in Astronomy The total momentum of interacting objects cannot change unless an external force is acting on them Interacting objects exchange momentum through equal and opposite forces Conservation of Angular Momentum -angular momentum= mass x velocity x radius angular momentum of an object cannot change unless an external twisting force is acting on it thus, angular momentum stays constant ex: increase of radius= decrease of velocity earth experiences no twisting force as it orbits the sun so orbits and rotation will continue indefinitely (exception: tidal force with moon) Energy -energy makes mat
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