Key words Physics unit 4
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- Created by: Sophie
- Created on: 20-01-15 13:22
the angle an object in circular motion turns through, if time period is T and f=frequency in radians..
angular displacement
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the rate of change of angular displacement of an object in circular motion
angular speed
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emf induced in the spinning coil of an electric motor or in any coil in which the current is changing. It acts against the applied pd
back emf
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Through a fixed resistor of resistance R, time constant=RC; exponential decrease equation for current/charge/pd (equation)
capacitor discharge
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1)fo object moving at speed v in uniform circular motion, a=v^2/r towards the centre of the circle 2) for a satellite in circular orbit...
centripetal acceleration
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the resultant force on an object that moves along a circular path. For an object of mass moving at speed v along circular path radius r the F=mv^2/r towards the centre of the circle
centripetal force
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for a system of interacting objects is the total momentum of the objects remains constant provided no external forces acts on the system.
conservation of momentum
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for two point charges Q and q, at distance r apart, the force between the two charges s given by F=Qq/... where Eo is permittivity of free space
Coulomb's law of force
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Oscillations that reduce the amplitude due to the presence of restive forces such as friction and drag
damped oscillations
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unwanted induced currents in metal parts of ac machines
eddy currents
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the total kinetic energy after the collision is equal to total kinetic energy before
elastic collision
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at a point in an electric field, is the force per unit charge on a small positively charged object at that point in the fieal
electric field strength
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at a point in an electric field is the work done per unit charge on a small positively charged objet to move it from infinity to that point in the field
electric potential
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the generation of an emf when the magnetic flux linkage through coil changes or a conductor cuts across magnetic field lines
electromagnetic induction
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a line/surface in a field along which the electric/gravitational potential is at a constant
equipotential
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when two objects fly apart, the carry equal and opposite momentum
expolsion
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the induced emf in the circuit is equal to the rate of change of flux linkage through the circuit. For a changing magnetic field in a fixed coil of area A and N turns, induced emf=-NAB/t
Faradays law of electromagnetic induction
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rule that relates the directions of the induced current, magnetic field and velocity of conductor when the conductor cuts across magnetic field lines and an emf is induced in it
Fleming's right-hand rule
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oscillations where there is no damping and no periodic force acting on the system so the amplitude of oscillation is constant
free oscillations
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oscillations of a system that is subjected to an external periodic force
forced oscillations
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The region surrounding an object in which it exerts a gravitational force on any other object
gravitational field
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The force per unit mass on a small test mass placed in the field
gravitational field strength
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An attractive force that acts equally on any two objects due to their mass
gravitational force
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at a point work is done per unit mass to move a small unit test mass from infinity to that point
gravitational potential
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when a current is induced by electromagnetic induction, the direction of the induced current is always such as to oppose the change that causes it
Lenz's law
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=BA for a uniform magnetic field of flux density B that is perpendicular to area A
magnetic flux
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the magnetic force per unit length per unit current on a current carrying conductor at right angles to the field lines. (sometimes referred to as magnetic field strength)
magnetic flux density
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through a coil with N number of turns, =NBA where B is the magnetic flux density perpendicular to area A
magnetic flux linkage
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the frequency of free oscillations of an oscillating system
natural frequency
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the gravitational force F between two point masses m and Mat a distance r apart given by F=GMm/r^2
Newtons law of gravitation
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a force that varies regularly in magnitude with a define time period
periodic force
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the charge per unit area in Coulombs per square metre on oppositely charged parallel plates in a vacuum when the electric field strength between the plates is 1v per metre
permittivity of free space
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when two or more bodies interact the total momentum is unchanged provided no external forces act on the body
principle of conservation of momentum
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the amplitude of vibration of an oscillating system subjected to a periodic driving force has the same frequency as resonant frequency
resonance
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the frequency if an oscillating system at resonance
resonant frequency
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motion of an object if its acceleration is proportional to the displacement of the object from equilibrium and is always directed towards equilibrium position
simple harmonic motion
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converts the amplitude of an alternating pd to a different value. It consists of two insulated coils(primary and secondary coil)wound round a soft iron laminated core
transformer
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motion of an object moving at a constant speed along a circular path
uniform circular allowance
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a regoin where the field strength is the same magnitude and direction at every point in the field
uniform field
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Other cards in this set
Card 2
Front
the rate of change of angular displacement of an object in circular motion
Back
angular speed
Card 3
Front
emf induced in the spinning coil of an electric motor or in any coil in which the current is changing. It acts against the applied pd
Back
Card 4
Front
Through a fixed resistor of resistance R, time constant=RC; exponential decrease equation for current/charge/pd (equation)
Back
Card 5
Front
1)fo object moving at speed v in uniform circular motion, a=v^2/r towards the centre of the circle 2) for a satellite in circular orbit...
Back
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