Dynamics Flashcards
What is Newton’s First Law?
Every object continues in a state of rest of constant speed in a straight line unless a net external force acts on it.
What is Newton’s Second Law?
The rate of change of momentum of a body is directly proportional to the net force acting on the body, and the rate of change of momentum takes place in the direction of the force.
What is force?
Rate of change of momentum and acts in direction of change in momentum.
How to calculate Force if mass is changing with constant velocity
F = v (dm/dt)
What is 1 Newton?
Force needed to accelerate a mass of 1kg by 1ms-2
What is Newton’s Third Law?
When body X exerts a force on body Y, body Y exerts a force of equal magnitude in opposite direction on Body X.
What are the conditions for the two forces in Newton’s Third Law?
They are action reaction pair on diff objects, cannot cancel each other out, and of same type of force.
What is linear momentum?
Product of mass and velocity, p=mv
What is impulse?
Product of force and time during which it acts
What is principle of conservation of linear momentum?
When objects of a system interact, their total momentum before and after interation are equal if no net external force acts on the system.
Perfectly elastic collision
Both momentum and kinetic energy conserved
Inelastic collison
Only momentum conserved, KE not conserved
Perfectly Inelastic collision
Only momentum conserved and particles stick together.
