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IEB PHYSICS FLASH
Definitions
89
Physics
12th Grade
05/11/2022

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Term
VECTOR
Definition
physical quantity that has both magnitude and direction and give examples
Term
SCALAR
Definition
a physical quantity that has magnitude only and give examples
Term
RESULTANT VECTOR
Definition
the single vector which has the same effect as the original vectors acting together
Term
DISTANCE
Definition
as the length of path travelled and know that distance is a scalar quantity
Term
DISPLACEMENT
Definition
a change in position (vector quantity that points from the initial to the final position)
Term
SPEED
Definition
the rate of change of distance and know that speed is a scalar quantity
Term
VELOCITY
Definition
the rate of change of position or the rate of displacement or the rate of change of displacement and know that velocity is a vector quantity
Term
ACCELERATION
Definition
the rate of change of velocity
Term
WEIGHT
Definition
the gravitational force the Earth exerts on any object on or near its surface
Term
NORMAL FORCE
Definition
the perpendicular force exerted by a surface on an object in contact with it
Term
FRICTIONAL FORCE
Definition
the force that opposes the motion of an object and acts parallel to the surface with which the object is in contact
Term
MAXIMUM STATIC FRICTION
Definition
The point of friction just before an object starts to move
Term
NEWTON'S FIRST LAW
Definition
An object continues in a state of rest or uniform (moving with constant) velocity unless it is acted upon by a net or resultant force
Term
INERTIA
Definition
the property of an object that causes it to resist a change in its state of rest or uniform motion
Term
NEWTON'S SECOND LAW
Definition
When a net force, Fnet, is applied to an object of mass, m, it accelerates in the direction of the net force. The acceleration, a, is directly proportional to the net force and inversely proportional to the mass
Term
NEWTON'S THIRD LAW
Definition
When object A exerts a force on object B, object B simultaneously exerts an oppositely directed force of equal magnitude on object A
Term
Force of donkey on cart in direction of motion
Definition
Identify action-reaction pairs (e.g. for a donkey pulling a cart, for a book on a table)
Term
vs
Definition
Term
Force of cart on donkey in opposite direction.
Definition
Term
LINEAR MOMENTUM
Definition
the product of the mass and velocity of the object. (vector and is the same direction as the velocity vector)
Term
NEWTON'S SECOND LAW IN TERMS OF MOMENTUM
Definition
The net force acting on an object is equal to the rate of change of momentum. (Note: there are two acceptable statements of Newton's Second Law)
Term
ISOLATED SYSTEM
Definition
Explain that an________ is one that has no net external force acting on it
Term
LAW OF CONSERVATION OF LINEAR MOMENTUM
Definition
The total linear momentum in a closed system stays conserved
Term
ELASTIC COLLISION
Definition
a collision in which both momentum and kinetic energy are conserved
Term
INELASTIC COLLISION
Definition
a collision in which only momentum is conserved
Term
IMPULSE (J)
Definition
the product of the net force and the contact time. ( impulse is a vector quantity and is in the same direction as the net force vector)
Term
#NAME?
Definition
Impulse =
Term
Definition
Apply the concept of impulse in everyday life, e.g. airbags, catching a hard ball
Term
WORK DONE ON AN OBJECT BY A FORCE
Definition
the product of the displacement and the component of the force parallel to the displacement . (work is a scalar quantity and is measured in joules (J))
Term
GRAVITATIONAL POTENTIAL ENERGY
Definition
the energy an object possesses due to its position relative to a reference point
Term
KINETIC ENERGY
Definition
the energy an object has as a result of the object's motion
Term
MECHANICAL ENERGY
Definition
the sum of gravitational potential and kinetic energy at a point
Term
THE LAW OF CONSERVATION OF ENERGY
Definition
the total energy in a system cannot be created nor destroyed; only transformed from one form to another
Term
THE PRINCIPLE OF CONSERVATION OF MECHANICAL ENERGY
Definition
In the absence of air resistance or any external forces, the mechanical energy of an object is constant
Term
WORK-ENERGY THEOREM
Definition
State that the work done by a net force on an object is equal to the change in the kinetic energy of the object
Term
POWER
Definition
the rate at which work is done or the rate at which energy is transferred
Term
WATT (W)
Definition
the power when one joule of work is done in one second. (1 W = 1 J
Term
EFFICIENCY
Definition
the ratio of output power to input power
Term
NEWTON'S LAW OF UNIVERSAL GRAVITATION
Definition
Every particle with mass in the universe attracts every other particle with a force which is directly proportional to the product of their masses and inversely proportional to the square of the distance between their centres
Term
WEIGHT
Definition
the gravitational force the Earth exerts on any object on or near its surface
Term
GRAVITATIONAL FIELD
Definition
a region in space where a mass will experience a force
Term
(DESCRIBE)
Definition
Term
GRAVITATIONAL FIELD
Definition
the force acting per unit mass where F is the force experienced by mass m in a gravitational field g
Term
(DEFINE)
Definition
Term
COULOMB'S LAW
Definition
Two point charges in free space or air exert forces on each other. The force is directly proportional to the product of the charges and inversely proportional to the square of the distance between the charges
Term
ELECTRIC FIELD
Definition
a region of space in which an electric charge experiences a force. The direction of the electric field at a point is the direction that a positive test charge would move if placed at that point
Term
(DESCRIBE)
Definition
Term
ELECTRIC FIELD AT A POINT
Definition
the force per unit positive charge
Term
(DEFINE)
Definition
Term
POTENTIAL DIFFERENCE
Definition
the work done per unit positive charge
Term
CURRENT
Definition
the rate of flow of charge
Term
OHM'S LAW
Definition
Current through a conductor is directly proportional to the potential difference across the conductor at constant temperature
Term
OHMIC CONDUCTOR
Definition
Term
NON-OHMIC CONDUCTOR
Definition
Term
RESISTANCE
Definition
a material's opposition to the flow of electric current
Term
KILOWATT HOUR (kWh)
Definition
a unit of energy and that 1 kWh is the amount of energy used when 1 kilowatt of electricity is used for 1 hour
Term
EMF
Definition
the total energy supplied per coulomb of charge by the cell
Term
MAGNETIC FIELD
Definition
State that a ______ exists around a permanent magnet or a current-carrying conductor
Term
Definition
Determine the direction of the magnetic field associated with A straight current-carrying conductor
Term
Definition
Determine the direction of the magnetic field associated with A current-carrying loop (single) coil of wire
Term
Definition
Determine the direction of the magnetic field associated with A solenoid
Term
Definition
Determine the direction of the force acting on a current-carrying conductor when the current-carrying conductor is perpendicular to the magnetic field
Term
Definition
Qualitatively explain the factors that affect the magnitude of the force on a current-carrying conductor using the equation
Term
ENERGY CONVERTION IN MOTORS
Definition
electrical energy to mechanical energy
Term
SPLIT RING COMMUTATOR
Definition
Explain that a d.c. motor has a
Term
MAGNETIC FLUX DENSITY (B)
Definition
A representation of the magnitude and direction of the magnetic field
Term
MAGNETIC FLUX LINKAGE
Definition
the product of the number of turns on the coil and the flux through the coil (N?)
Term
Definition
The factors affecting the magnitude of the induced emf
Term
FARADAY'S LAW OF ELECTROMAGNETIC INDUCTION
Definition
the emf induced is directly proportional to the rate of change of magnetic flux (flux linkage)
Term
LENZ'S LAW
Definition
the induced current flows in a direction so as to set up a magnetic field to oppose the change in magnetic flux
Term
Definition
When given a magnetic flux vs time graph, sketch the corresponding induced emf vs time graph (and vice versa)
Term
ENERGY CONVERTION IN GENERATORS
Definition
mechanical energy to electrical energy
Term
Definition
State with reasons which factors affect the emf induced
Term
SLIP RINGS
Definition
AC GENERATORS & MOTORS
Term
Definition
Show an understanding of the principle of operation of a simple iron-cored transformer
Term
Definition
Discuss the scientific and economic advantages of high voltages and low currents for the transmission of electrical energy through the national grid
Term
DIODE
Definition
a component that only allows current to flow in one direction
Term
full-wave rectification
Definition
A bridge rectifier - four diodes are used for the full-wave rectification of an alternating current
Term
half-wave rectification
Definition
single diode is used for the half-wave rectification of an alternating current
Term
SPEED OF LIGHT
Definition
constant (3
Term
ENERGY OF A PHOTON
Definition
State that the ________is directly proportional to the frequency of the light
Term
1 eV =
Definition
= 1,6
Term
PHOTOELECTRIC EFFECT
Definition
the process that occurs when light shines on a metal and electrons are ejected
Term
SIGNIFICANCE OF THE PHOTOELECTRIC EFFECT
Definition
it establishes the quantum theory and it illustrates the particle nature of light
Term
THRESHOLD FREQUENCY
Definition
the minimum frequency of incident radiation at which electrons will be emitted from a particular metal
Term
WORK FUNCTION
Definition
the minimum amount of energy needed to emit an electron from the surface of a metal and know that the work function is material specific
Term
INTENSITY OF LIGHT WILL INFLUENCE
Definition
Explain why the number of electrons ejected per second increases with the intensity of the incident radiation provided the frequency is above the threshold frequency
Term
FREQUENCY OF LIGHT ABOVE THRESHOLD WILL INFLUENCE
Definition
Explain why if the frequency of the incident radiation is above the threshold frequency, then increasing the frequency of the radiation will increase the maximum kinetic energy of the ejected electrons
Term
Definition
Explain the source of atomic emission spectra (of discharge tubes) and their unique relationship to each element
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