Momentum Flashcards
Momentum
The product of an objects mass and its velocity
Linear momentum of an object
A vector quantity with the same direction as the velocity of the object
Newtons 2nd law in terms of momentum
The net force acting on an object is equal to the rate of change of momentum of the object
(in the direction of the net force)
Impulse
The product of the net force acting on the object and the time the net force acts on the object,
Isolated system
a system on which the net external force is zero
External forces vs internal forces
External forces originate outside the colliding bodies (e.g. friction)
While internal forces(e.g. contact forces between colliding particles) originate within the isolated system.T
The principle of conservation of linear momentum
The total linear momentum of a closed system remains constant
Impulse units
Newton seconds
N.s
Newton 1
A body will remain in its state of rest or motion(constant velocity) until a net force acts on it.
Newton 2
When a net force acts on an object the object will accelerate in the direction of the force and the acceleration is directly proportional to the force and inversely proportional to the mass of the object
Newton 3
When body A exerts a force on body B, body B exerts a force on body A that is equal in magnitude but opposite in direction to A
Newton 4:
Law of Universal gravitation
Each body in the universe attracts every other body with a force that is directly proportional to the product of their masses and inversely proportional to the square of the distance between their centres.
What is the difference between momentum and inertia
Inertia is a property of a body that resists any change in motion. All objects have inertia whether they are moving or not.
Momentum is product of objects velocity and mass. An object must be moving in order to have momentum.
