everything else Flashcards
vector quantities
acceleration, velocity, force, weight
scalar quantities
temperature, charge, power
Life cycle of a star
Nebula is a cloud of dust and gas
Pulled together due to gravity
Nuclear fusion starts, so forces are balanced
Fusion stops, star compresses
Helium fusion starts
Expands
Reactions slow, gravity stronger
Compresses or start explodes
Terminal Velocity
Object has weight which is downward force
As ball accelerates downwards, the upwards force of drag will increase
Until weight = drag so forces are balanced
No acceleration as the object travels at constant speed
Ball has reached terminal velocity
Light dependent resistors
Resistance decreases as light increases
Thermistors
Resistance decreases as temperature decreases
Nuclear reactor
Moderator
-Made of graphite
-Absorbs kinetic energy of neutrons to slow them down
Control rods
-Made of boron
-Absorbs neutrons to stop reaction
Background radiation
Radiation that is always present and created by things such as cosmic rays or rocks
Energy Stores
Chemical Energy
-Bonds
-Food, batteries
Kinetic Energy
-Movement
-Person running, a bus
Gravitational Energy
-Object gaining height
-Airplane, ski-lift
Elastic Energy
-Energy stored when an object is stretched, squashed, or twisted
-Rubber bands
Magnetic Energy
-Attraction or repulsion
-Bar magnet, fridge magnet
Electrostatic Energy
-Like and unlike charges
-Lightning
Mains Electricity
Live Wire
-Brown
-Provides path where electricity from power station travels
Neutral Wire
-Blue
-Completes circuit
Earth Wire
-Green and yellow
-Protects user if there is a fault by providing a path for current to escape if live wire touches casing
Diodes
Only let charge flow one way
celsius to kelvin
+273
mass and volume q
use a balance (to measure the mass);
measure mass before volume
use of eureka/displacement can or measuring cylinder;
mention of eye-level or parallax avoidance;
make sure rock completely submerged
make sure no water splashes out/put rock in gently;
