Studied by 7 people
weight vs mass
Mass is a measure of how much matter there is in an object, while weight is a measure of the size of the pull of gravity on the object.
weight =
mass x gravitational field strength
vector
a quantity with a magnitude and a direction, such as displacement
scalar quantity
a quantity only with magnitude
displacement
vector quantity that refers to "how far out of place an object is"
distance
a scalar quantity that refers to the distance between two positions
velocity
the speed of something in a given direction.
speed
the speed of something without a given direction
acceleration
the change in speed or velocity of an object over a certain timea
acceleration formula
(final velocity - initial velocity)/time
motion equation
final velocity sq - initial velocity sq = 2 x acceleration x distance
force equation
force = mass x acceleration
efficiency
useful energy output / total energy input
kinetic energy equation
KE (J)=0.5 x mass (kg) x velocity sq (m/s)
gravitational potential energy equation
GPE (J)= mass (kg)x gravitation field strength (N/kg)x height(m)
speed equation
distance / time
distance time graph
the slope tells the speed
acceleration in free fall
10 m/s/s
velocity time graph
slope tells the acceleration while area is distance
length on arrows that demonstrate a force
the magnitude of the force
resultant force
the overall force on an object
balanced force
the resultant force is 0
unbalanced force
the resultant force is not 0
balanced force on stationary object
object stays stationary
balanced force on moving object
object continues constant movement
Newton’s first law
every object will remain at rest or in uniform motion in a straight line unless compelled to change its state by the action of an external force.
centripetal force
the force acting on an object in circular motion that pulls it towards the axis of rotation
circular motion at constant speed
a changing velocity, an acceleration
types of centripetal force
gravity, friction, tension
Newton’s seconds law
the acceleration of an object is dependent upon two variables - the net force acting upon the object and the mass of the object
Newton’s second law equation
F=ma
acceleration
a change in velocity
inertial mass
The ratio of force over acceleration
Newton’s Third Law
if an object A exerts a force on object B, then object B must exert a force of equal magnitude and opposite direction back on object A.
action - reaction pairs
forces of equal magnitude and opposite direction that act on different object.
law of conservation of energy
energy cannot be created or destroyed
energy stores
chemical, kinetic, elastic potential, electromagnetic, nuclear, electro static, thermal
energy transfers
mechanically, electrically, heating, radiation
renewable energy sources
bio-fuels, solar, wind, tidal, hydroelectric, geothermal
why we can’t only use renewable energy
most of our systems are formed around fossil fuels, a non-renewable energy
non renewable energy sources
fossil fuels, nuclear power
how heat can be transferred
conduction, convection, radiation
thermal insulation
the reduction of heat transfer by insulating objects
thermal conductivity
the ability of a given material to conduct/transfer heat
Note 
Flashcard (78)