Dynamics Flashcards
Therminal Velocity
Terminal velocity is the constant macimum velocitof an object when the resistive forces on it are equal and opposite to the accelerating foce.
Newtons Third law
If a body “A” exerts a force on a body “B”, then “B” exerts an equal and opposite force on “A”
F=ma
The mass of a body × it’s acceleration is equal to the vector sum of the forces acting on the body (vector force)
Momentum
The momentum of an object is its mass multiplied by it’s velocity. It is a vector (p=mv)
Newtons second law
The rate of change of momentum of an object is proportional to the resultant force acting upon it, and takes place in the direction of the force (F=ma).
The principle of conservation of momentum
The vector sum of the momenta of bodies in a system stays constant even if forces act between the bodies, provided there is no external resultant force.
Elastic collision
A collision in which there is no change in total kinetic energy
Inelastic collision
A collision in which kinetic energy is lost
Collisions and explosions
Total momentum before collision = total momentum after collision
