Miscellaneous definitions Flashcards
Free Body diagram
Shows a simplified image of the questions
- Vector arrows represent forces
- Axes to show coordinates
Newton’s first Law
Every object will remain in a state of rest or in uniform motion in a straight line (constant velocity) unless acted upon by a net (unbalanced) force.
If net force 0, constant v.
Easy way to calculate friction coeff on a slope
tan of the angle of elevation
Define work
The total energy transferred by a force acting in the direction of displacement
Potential energy
The total energy in a system based on the relative positions of its parts
Closed system
A system that does not exchange any energy or matter with the environment
Law of conservation of energy
In a closed system, total mechanical energy stays constant
Newton’s third law
When one object exerts a force on a second object, the second object simultaneously exerts a force equal in magnitude and opposite in direction on the first object.
Forces ALWAYS come in pairs
Newton’s second Law
this is where weight comes from: the net force acting on an object can be found by multiplying A and mass
What is power
The rate at which work is done- Fd or E/T
What is impulse
The change in power, or Force times time
What is the law of conservation of momentum
The vector sum of all momenta in a closed system is conserved (remains constant
Define radioactivity
he emission of ionising radiation as a result of changes to the nuclear energy of a radionuclide.
