Paper 1 Flashcards
Newtons First Law
An object at rest will stay at rest unless a resultant force acts on it
Newtons Second Law
Acceleration of a body is directly proportional to the resultant force acting on the body and the change takes place in the direction of the force (F=ma)
Newtons Third Law
For every reaction there is an equal and opposite reaction
Factors affecting EMF induced (dynamo)
Strength of magnet
The rate at which magnet is inserted or removed from coil
Number of turns in the coil
Factors affecting EMF induced (transformers)
Current
Number of turns
Iron core
Lenz’s Law
The current induced in a conductor always flows in such a direction as to oppose the change producing it
Faraday’s Law
The magnitude of the induced EMF is directly proportional to the rate of change of flux linked with the conductor
Conservation Laws in Decays
Conservation of charge applies
Charge of particle before equals charge of two particles after
Conservation of energy applies
Energy of original particle equal to that of the two after
Conservation of momentum applies
Momentum before equals momentum after
Uniform Magnetic Field
An area where a force acts on charged particles and the force is the same at all points
Alpha particles directed at gold foil experiment
Most particles went straight through Some deflected Very few deflect at very large angles Atom mainly empty space Charge concentrated at centre Dense nucleus
How does magnetic field induce EMF?
Magnetic flux
Magnet vibrates
Flux through coil changes
EMF induced
EMF definition
The energy provided by a cell per unit charge
