Ms Atkin Physics Flashcards
speed =
distance ÷ time
units for speed =
m/s
acceleration =
change in velocity ÷ time
units for acceleration =
m/s²
acceleration could also be =
(final velocity - initial velocity) ÷ time
v =
final velocity
u =
initial velocity
a =
acceleration
t =
time
s =
seconds
m =
mass or meters
units for deceleration =
-n m/s²
scalar quantities =
Distance Power Energy d pets Time Speed
vector quantities =
DIsplacement VElocity WEight dive wefo accmo FOrce ACCeleration MOmentum and d pets
units for mass
kilograms
definition of thrust
increases the velocity of an object
definition of torque
changes the rotation of an object
definition of electrostatic force
a force that acts between two charges
unit of force
newtons
definition of friction
when an object slides across a surface
friction slows down the obect
force =
mass x acceleration
units for weight =
newtons
definition of mass
how much matter is in an object
definition of weight
the force acting on the matter of an object
the … of an object is … everywhere, but its … can …
the mass of an obect is the same everywhere, but its weight can change
the gravitational field strength of earth is =
10 N/kg
the gravitational field strength of the moon is =
1.6 N/kg
units for gravitational field strength =
N/kg
weight =
mass x gravitational field strength
definition of air resistance
the frictional force acting in the opposite direction to the movement of the object
1st stage of falling
the object accelerates downwards because of its weight
there is little air resistance
2nd stage of falling
it gains speed and the air resistance increases
3rd stage of falling
object’s weight is balanced by the air resistance and reaches a steady speed called terminal velocity
factors affecting the terminal velocity of an object
its mass
its surface area
the acceleration due to gravity
stopping distance =
thinking distance + braking distance
definition of thinking distance =
the distance traveled in reaction time of the driver
thinking distance can increase if the driver is :
tired
distracted
drugs and alcohol
car speed
definition of braking distance =
the distance taken to stop once the brakes are applied
braking distance can increase if :
car's brakes or tyres are in bad condition poor road conditions weather conditions car has a larger mass car speed
resultant force =
adding together all the forces that act upon an object
momentum =
mass x velocity
units for momentum =
kg m/s
p =
momentum
total momentum … in explosions and collisions
total momentum stays the same in explosions and collisions
change in momentum =
force x time
modern cars have safety features that absorb … in collisions
modern cars have safety features that absorb kinetic energy in collisions
safety features of modern car =
crumple zones
seat belts
air bags
solar system consists of :
the sun
planets and dwarf planets
comets and asteroids
moons
there are … planets
there are 8 planets
the planets are :
Mecury My Venus Very Earth Easy Mars Method Jupiter Just Saturn Speeds Uranus Up Neptune Naming (pluto) (planets)
the further out a planet …
the further out a planet, the longer a year takes
comets are =
balls of ice or dust in orbit around the sun
asteroids are =
rocky objects, smaller than planets
most asteroids are found in =
an asteroid belt
a satellite is =
anything that orbits some thing like a planet, moon, star etc
can be natural or artificial
artificial satellites are used for :
telecommunications
satnav
spying on other countries
weather forecasts
orbital speed of planets and satellites =
2 x π x (orbital radius ÷ time)
stars are formed from =
massive clouds of dust and gas in space
a galaxy is =
immense groups of stars held together by gravity
what reaction occurs in stars?
nuclear
Doppler effect is =
change in frequency and wavelength
Earths atmosphere contains … % oxygen
Earths atmosphere contains 21 % oxygen
optical telescopes are used to =
observe visible light from space
