physics moment unit 7

momentum

P=MV, quantity of motion and object has (kgm/s)

Impulse

J=FT, change in an object’s moment caused by force acting over time (kgm/s)

Velocity

the speed of an object, AND DIRECTION ITS MOVING, (m/s)

Collision

2 or more forces exert force on each other for a short amount of time

elastic collision

MiVi1+M2V2i = M1V1f+M2V2F, where momentum AND energy are preserved (ALLLLLL of it) one way to identify is when the objects bounce off of each other bc this means their energy is staying in the objects.

inelastic collision

MiVi1+M2V2i = M(1+2)Vf momentum conserved, SOME energy is lost. this is when they stick together

perfect inelastic collision

MiVi1+M2V2i = M(1+2)Vf, momentum conserved, ALLLL energy lost.

conservation of momentum

MiVi1+M2V2i = M1V1f+M2V2F, the idea is lowk the same as conservation of energy. If no external forces act on a system, the total momentum stays the same.

system

many pieces working together

external force

a force acting on a system that comes from outside the system. it cant change total momentum

REMINDER: J=FT=△P= M△V

This means: impulse = force x time = change in momentum = mass x change in velocity. Keep this in mind you might need this for a multi-step frq!!

Explosions Collision

O=M1V1f + M2V2F, Be able to calculate with this, especially recoil momentum!!