Further Mechanics Definitions Flashcards
Impulse of a force
The product of the force and the time for which it acts
Principle of conservation of momentum
In any interaction between bodies, linear momentum is conserved, provided no resultant external force acts on the bodies
Newtons 3rd law
All forces involve the interaction between two objects where the two forces are always equal in size but opposite in direction and always involve two different objects exerting forces on one another
Impulse
The product of the force applied and the time for which it acts
Impulse-momentum equation
F(delta)t=m(delta)v
Principle of conservation of energy
Energy can never be created or destroyed, but it can be transferred from one form into another
Inelastic collision
A collision where some of the kinetic energy is lost
Elastic collision
A collision where all of the kinetic energy is conserved
Momentum
Product of a body’s mass and velocity
Electron-volt
The energy gained by a particle of unit electronic charge when accelerated by a p.d of 1 volt
Useful relationship
Kinetic energy = p2/ 2m
Components of vectors
Parallel and perpendicular to the direction of motion
Angular displacement delta theta
The angle through which something rotates, measured in radians, rad
1 rad
360/2(pi)= 57.3
Angular velocity (curly w)
How rapidly an object rotates in a circle, rad s^-1
