Paper 1 - Definitions Flashcards
Work, Energy, Power & Momentum
Newton’s 1st law
Object stays at rest or moves with constant velocity when no resultant force
Work, Energy, Power & Momentum
Newton’s 2nd law
rate of change of momentum is directly proportional to resultant force acting upon it (F=ma)
Work, Energy, Power & Momentum
Newton’s 3rd Law
when 2 objects interact, they exert equal and opposite force on each other of the same type
Work, Energy, Power & Momentum
power
- rate of transfer of energy
- rate at which work is done
Electricity
Potential Difference
energy transferred per unit of charge between 2 points
Electricity
emf
voltage across terminals when there is no current passing through
Electricity
Kirchoff’s 1st Law
current entering a junction is equal to total current leaving junction
Electricity
Kirchoff’s 2nd Law
sum of all voltages in a loop = emf of battery
Quantum
Photoelectric effect
When light is incident on a metal plate it causes electrons to be emitted from the surface
Quantum
Work Function
Minimum energy required to remove an electron from the surface of a metal
Quantum
Fluorescence
when UV light is absorbed by a material then emitted as visible
Quantum
De Broglie Hypothesis
- any particle can behave as a wave
- any wave can behave as a particle
Simple Harmonic Motion
Conditions
- acceleration of object directed to equilibrium point
- acceleration proportional to displacement from equilibrium position
Simple Harmonic Motion
Resonance
when driving frequency = natural frequency of system (-> large amplitude)
