unit 5 Flashcards
momentum
“mass in motion” or quantity of motion
impulse
change in momentum
momentum can change if…
a net external force is applied over a time interval to that system
the momentum of an object can be changed if…
a net external IMPULSE is applied
open system
which there is a force applied to that system by something outside the system
closed system
which there are no forces applied to the system from outside the system
elastic collision
-objects bounce off
-momentum is conserved
-kinetic energy is conserved
inelastic collision
-objects bounce off
-momentum is conserved
-kinetic energy is NOT conserved
perfectly inelastic collisions
-objects stick together
-momentum is conserved
-kinetic energy is NOT conserved
an explosion
-1 object explodes/splits into 2 or more objects
-velocity center mass of system of objects after explosion = velocity of 1 object before explosion (momentum is conserved)
