Mechanics Flashcards
Newton’s 1st Law
An object will remain at rest or continue to travel at constant velocity unless acted on by an external force
Newton’s 2nd Law
The resultant force on an object is directly proportional to and in the same direction as its rate of change of linear momentum
Newton’s 3rd Law
If body A acts on body B with a force F then body B acts on body A with a force equal in magnitude but opposite in direction to F
Newton’s Law of gravitation
Force is directly proportional to the product of their masses and inversely proportional to the square of their separation.
Newton
The force which gives a mass of 1 kg an acceleration of 1ms^-2
Linear momentum
Mass x velocity = linear momentum
Net force on a body
Rate of change of momentum
Impulse of a force
The product of a force and the time for which it acts OR the change in momentum of an object
Principle of conservation of momentum
In a closed system the total momentum in any direction is conserved.
Perfectly elastic collision
A collision in which both kinetic energy and momentum are conserved
Inelastic collision
A collision in which momentum is conserved but kinetic energy is not
Completely inelastic collision
A collision in which all of the kinetic energy is converted to other forms
Radian
The angle subtended by an arc equal in length to the radius of the circle
Centripetal acceleration
The total acceleration of an object which is undergoing circular motion OR the acceleration towards the centre of the circle.
Centripetal force
The total force acting on an object which is undergoing circular motion OR the resultant force on an object which is travelling in a circle.
