Key Words Flashcards
(32 cards)
momentum
property of moving objects
resultant force
number of forces acting at a point replaced by a single force that had the same effect on the motion as the original froces
gradient of distance-time graph shows us?
speed
velocity=
speed in a given direction
gradient of a velocity-time graph represents
accleration
stopping distance
thinking distance + braking distance
thinking distance=
drivers reaction time
braking distance=
distance traveled under the braking force
terminal velocity=
when resultant force is zero and object moves at constant speed
force applied to an elastic object results in
object stretching and storing elastic potential energy
work done=
force causes and object to move through a distance.
ENERGY IS TRANSFERED
conservation of momentum=
total momentum before an event is equal to the total momentum after the event
current=
flow of electrical charge
potential difference=
work done per coulomb of charge that passes between points
Ohm’s Law=
current through a resistor is proportional to voltage provided the temp is constant
what is a filament lamp?
contains thin coil of wire (filament) heats up when electrical current is present produces light
In a filament lamo as temp increases…
resistance increases
current in series
same current flows through
potential in series
total p.d shared between them
the current through a diode flows in one direction only so..
the diode has a very high resistance in the reverse direction
resistance of light dependent resistor decreases as
light intensity increases
resistance of a thermistor decreases as
temperature increases
mains electricity is an a.c supply and has a frequency and voltage of..
50 Hertz
230 V
3 wires in a three core cable
Earth (green and yellow)
Neutral (blue)
Live (brown)
