Conservation of angular momentum during collisions - Physics Forums Now, if we consider a rigid rod AB, hinged at point A, initially at rest in the vertical position, that can rotate around a horizontal axis passing on A, and we shoot a small bullet at the other extreme B, with a velocity perpendicular to the rod AB, the linear momentum is not conserved, as there will be an impulsive force on A keeping the rod
Conservation of Momentum: Falling object - Physics Forums Its the total momentum of a closed system that is conserved Not the momentum of a particle In your case the particle has a force acting on it and as such the momentum changes There is no law of physics which states that the momentum of a particle is conserved The gravitational force changs the momentum of a ball in free-fall
Conserved quantities under the Lorentz boost - Physics Forums The following combination of observables is conserved: ##HR - Pc^2t## where ##H## is the energy, ##R## is the center-of-mass position, and ##P## is the momentum In other words, this means that the center of mass of any system moves with constant velocity along a straight line
Conservation of momentum and apple falling - Physics Forums The momentum of an apple falling to the ground is not conserved because the external force of gravity acts on it But the momentum is conserved in a larger system Explain? I am confused because gravity is the external force acting upward, so what's the force that is acting up on the apple
How does a stop-start-stop car conserve momentum? - Physics Forums 3 As momentum is a conserved property So I am wondering where the momentum is conserved when A The car goes from say 0 to 60 mph from none to some p B The car goes from 60 to 0 mph from some to none p Does the car dial in momentum to itself through two drive wheels via the road attached to the planet ie from the planet
Meaning of the word conserved in relativity - Physics Forums The mass of an isolated system is conserved as a trivial consequence of energy-conservation (i e , energy is conserved for any frame, including the system's rest frame) If one goes with #3, then one must admit that there's a sense in which velocity is conserved, too (finally connecting things back to your post here, @PeroK) And if that sounds
How momentum is conserved in an inelastic collision - Physics Forums These interactions that lose energy to the surroundings will keep energy from being conserved in the system They also violate the concept of “no external forces” and can keep momentum from being conserved When we say momentum and energy are conserved we are claiming we have made all of the external interactions negligibly small
Do phonons conserve momentum or not? - Physics Forums Thus, the conservation of momentum is only conserved modulo the reciprocal vectors Thus, collisions between phonons in a crystal sometimes have a momentum added or subtracted by a reciprocal vector If the reciprocal vector is not zero, the collision places the phonon in a different branch
Lagrangian hamiltonian mech COC Goldstein 8. 27 - Physics Forums what is the hamiltonian? is it conserved? b) introduce a new coordinate defined by Q = qsin(wt) find the lagrangian and hamiltonian with the new coordinate and is it conserved? Homework Equations qp-L = H The Attempt at a Solution Just wondering what the method is to solve b) or is it as simple as q = Q sin(wt)
What is the relationship between gravity and conservation of momentum? When the rock hits the ground, its momentum becomes zero At the same instant, the Earth also stops moving upwards The rock's momentum cancels out the Earth's momentum At all times during the rock's fall and crash-landing, momentum has been conserved _____