Unit 4 physics definitions

HideShow resource information
Principle of conservation of momentum
In any interaction between bodies, linear momentum before equals linear momentum after, provided no external force acts on the bodies
1 of 25
Elastic collision
a collision in which kinetic energy is conserved (eg gas molecules)
2 of 25
Inelastic collision
a collision in which KE is not conserved (eg a car crash)
3 of 25
Principle of conservation of energy
Energy cannot be created or destroyed but can be changed from one form to another. (Remember mass and energy are interchangeable by E=mc2 )
4 of 25
centripetal force
force required to maintain circular motion
5 of 25
centripetal acceleration
acceleration of an object moving in a circular path (always perpendicular to velocity so no change of speed)
6 of 25
Electric field
region in which a charge will experience an electrostatic force
7 of 25
Electric field strength
Force acting per unit charge
8 of 25
Coulomb's Law
The force between two point charges is directly proportional to the product of the charges and indirectly proportional to the square of the separation.
9 of 25
Uniform field
Field strength is constant in magnitude and direction at all points (shown by parallel field lines pointing in same direction)
10 of 25
Radial (electric/gravitational) field
Field around a point (charge/mass) shown by field lines radiating (outwards from +ve charge, inwards towards a negative charge)
11 of 25
The charge stored per unit volt by a capacitor
12 of 25
time constant
the time taken for the charge (or p.d.) of a capacitor in series with a resistor to decay to 37% of its initial value. (37% = 1/e)
13 of 25
magnetic flux density
magnetic flux density
14 of 25
magnetic flux
the product of the flux density through a loop and the area of the loop, F = BA
15 of 25
magnetic flux linkage
the product of the flux through a loop of a coil and the number of turns in that coil
16 of 25
Faraday's Law
Induced emf in a loop of a conductor is directly proportional to the rate of change of fluxed linked by the loop.
17 of 25
Lenz's Law
the induced current in a conductor will set up a magnetic field which will oppose the changes which are creating the induced current
18 of 25
nucleon number (mass number)
number of neutrons + number of protons in a nucleus
19 of 25
thermionic emission
process in which electrons are released from a heated filament
20 of 25
process in which particles and antiparticles combine to form a photon of energy (mass converted to energy)
21 of 25
particle made of quarks (baryon or meson). They are held together by the strong nuclear force
22 of 25
particle made of three quarks (or three antiquarks) (eg proton or neutron)
23 of 25
particle made of one quark and one antiquark (eg pion)
24 of 25
a set of fundamental particles which do not interact by strong nuclear force (eg electron, electron neutrino)
25 of 25

Other cards in this set

Card 2


Elastic collision


a collision in which kinetic energy is conserved (eg gas molecules)

Card 3


Inelastic collision


Preview of the front of card 3

Card 4


Principle of conservation of energy


Preview of the front of card 4

Card 5


centripetal force


Preview of the front of card 5
View more cards




Missing flip for 14 - the magnetic flux perpendicular to unit area.

Similar Physics resources:

See all Physics resources »