Dynamics Flashcards
Newtons first law
Every object will remain at rest or in uniform motion in a straight line unless compelled to change its state by the action of an external force
Newtons second law
That the acceleration of an object is dependent upon two variables - the net force acting upon the object and the mass of the object.
Newtons third law
or every action in nature there is an equal and opposite reaction.
Definition of the newton
1 newton is equal to the force that would give a mass of 1 kg an acceleration of 1ms^2
Definition of mass
Mass is a measure of how much matter or material is in an object and its measured in kg
Definition of weight
Weight is a measure of how large the force of gravity is on an object and its measured in newtons.
Linear momentum meaning
Object defined as the product of its mass and its velocity
Definition of force
Force can be defined as change in momentum per unit time . Force=change in momentum/time
Principle of conservation of momentum
In any collision within an isolated system the total momentum of the interacting bodies remains constant.
Isolated refers to a system in which no other forces acting during the collision.
Elastic collision
The kinetic energy before and after the collision is equal
Momentum is also conserved
Inelastic collision
Kinetic energy after collision is less as kinetic energy is lost ,such as heat in its surroundings
Momentum is conserved
Explosive collision
Momentum before and after=0
Momentum is conserved
State the relationship between force and momentum.
The rate of change of momentum of an object is proportional to the
resultant force acting on it, (and takes place in the direction of that
force)
State the relationship between force and momentum.
The rate of change of momentum of an object is proportional to the
resultant force acting on it, (and takes place in the direction of that
force)
