Momentum and Impulse Flashcards
Define momentum
Product of the mass and the velocity of an object
Formula for momentum
p=mv
Unit for momentum
Kg.ms^-1
What is a collision?
A collision is an isolated event in which two or more moving bodies exert forces on each other over a relatively short time
Change in momentum formula
🔺p = pf-pi = mv(f) - mv(i)
Newton’s second law in terms of momentum
The net force acting on an object is equal to the rate of change of momentum
Formula for momentum in terms of newton’s second law
Fnet = 🔼p ÷ 🔼t
What is a system
A collection if two or more objects that interact with each other
An isolated system?
A collection of two or more objects that interact with each other, where this collection is free from the influence of a net external force that alters the momentum of the system
External net force?
A force that originates from a source other than the objects within the system and which is not balanced by other forces.
Law of conservation of momentum?
The total linear momentum of an isolated system remains constant
The equation for conservation of momentum
See textbook pg 29
Inelastic collisions
Kinetic energy not conserved
Energy dissipated into surroundings (e.g. sound)
Momentum is conserved
Elastic collisions
Kinetic energy is conserved
Momentum is conserved
What is impulse?
Equal to the change of momentum *
Product of the netforce and the time in which the netforce acts
