Section 1
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unit of work
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Last updated
6 years ago
Date created
Mar 1, 2020
Cards (72)
Section 1
(50 cards)
unit of work
newton meter
vector
magnitude and direction
distance is
the total amount of ground covered
Work =
force x distance
acceleration is
rate of change in velocity
conditions of total internal refraction
light must be travelling from a more optically dense material to a less optically dense material angle of incidence is greater than the critical angle for the given material
unit of energy
joules
weight
force a body exerts due to the pull of gravity
nuclear fussion
this is when two lighter nuclei combine to form a single heavier nucleus
if light enters or leaves a different material, of different optical density
the speed of light changes and therefore the direction of travel changes
unit of momentum
kgm/s²
displacement is
shortest distance from start to finish in a certain direction
formula for kinetic energy=
½mv²
light travels in
straight lines
friction is
a force that opposes motion
momentum depends on
mass velocity
conservation of momentum
when two bodies collide, the total momentum remains constant, providing that there are no external forces acting
Bohr
introduced the idea of electrons orbiting a nucleus un discrete energy levels, by studying the emission spectra of gases
scalar
has magnitude only
acceleration=
velocity/time
centrepedal force depends on
mass of object speed of object radius of circle
balanced forces exist when
two forces act in opposite directions but are the same size
density=
mass/volume
change in momentum=
force x time
Rutherford
fired positively charged alpha particles at a thin gold foil most alpha particles went straight through with no or little deflection some were deflected through very large angles and a few came straight back introduced nucleus
2nd law
if a resultant force acts on a body the body will not remain at rest or move at constant velocity, it will accelerate
JJ Thompson
plum pudding model a sphere of positive charge with tiny negative electrons stuck in it
dispersion
spreading out of white light into its separate colours
principle of energy
energy cannot be created or destroyed, only changed into different forms
momentum=
mass x velocity
velocity is
rate of change in displacement
waves
transfer energy from one point to another in the direction in which the wave is travelling, without the movement of material as a whole
waves are produced
by vibrations
friction acts in the
opposite direction of the motion of object
density is
mass per unit volume
reduce friction by
lubrication
energy types
kinetic light sound EPE GPE chemical electrical nuclear magnetic heat
power=
work done/time
speed is
rate of change of distance
air resistance or drag
occurs when the object moves through air or fluid
light speed in vacuum
300000km/s
power
rate at which work is done or energy is transferred
resultant force=
mass x acceleration
nuclear
energy stored inside nucleus due to its missing mass
unit of acceleration
m/s²
1st law
a body will remain at rest or move at a constant velocity if the resultant force acting on the body is zero
alpha α ⁴ He ₂
helium nucleus positively charged deflected by magnetic field
mass
the measure of the amount of material in a body
nuclear fission
This is when heavy nuclei can be forced to split into two lighter nuclei
GPE
the type of energy anything above the ground has
Section 2
(22 cards)