ch 6 - momentum Flashcards
spring collision
. must be head on
. ball must not be given any spin
. both trolleys will bounce back
. OPPOSITE’S SPEED
1st moving, 2nd at rest
1st now at rest, 2nd moving
what are sticky collisions
. opposite of springy
. both trolleys move together, motion is shared
. combined speed is half original
mass and velocity inversly proportional
what is linear momentum
the linear momentum of a body is the product of its mass and velocity
momentum formula
p = mv
what is a closed system
a system of interacting objects in which there are no external forces
principle of conservation of momentum
the sum or total momentum of the bodies in a closed system is constant provided no resultant external force acts
what are the types of collision
. elastic
. inelastic
what is a perfectly elastic collision
where total kinetic energy of all bodies remains constant before and after
relative speed of the bodies’ approach = relative speed of their seperation
. kinetic energy conserved
. momentum conserved
what is an inelastic collision
total kinetic energy of the bodies becomes smaller
. momentum is conserved
newton’s first law
an object remains at rest or travels at constant velocity unless it is acted on by a resultant force
newton’s first law
an object remains at rest or travels at constant velocity unless it is acted on by a resultant force
newton’s second law
resultant force is proportional/equal to mass * acceleration
resultant force is equal rate of change of momentum
F = <>p / <>t
F = ma
newton’s third law
when two bodies interact, the forces they exert on each other are equal in size and opposite in direction
EVERY ACTION HAS AN EQUAL AND OPPOSITE REACTION
Fx = - Fy
