Newton's Laws and Momentum Flashcards
Newton’s First Law
An object continues in a state of rest or uniform (moving with constant) velocity unless it is acted upon by a net or resultant force
Inertia
The property of an object that causes it to resist a change in its state of rest or uniform motion
Newton’s Second Law
When a force, Fnet, is applied to an object of mass, m, it accelerates in the direction of the net force. The acceleration is directly proportional to the net force and inversely proportional to the mass.
Fnet =
ma
Newton’s Third Law
When object A exerts a force on object B, object B simultaneously exerts an oppositely directed force of equal magnitude on object A.
Action-reaction pairs
Equal in magnitude, act in opposite directions, act on different objects, occur simultaneously and act along same line
Momentum
The product of the mass and velocity of the object
Nature of quantity: Momentum
Vector
p=
mv
units for momentum
kg.m.s-1 - Direction
Newton’s Second Law in terms of momentum
The net force acting on an object is equal to the rate of change of momentum
Fnet=
delta P/delta T
Law of Conservation of Linear Momentum
The total linear momentum of an isolated system remains constant (is conserved)
Elastic Collision
A collision in which both momentum and kinetic energy are conserved
Inelastic Collision
A collision in which only momentum is conserved
