100 or so Paper 2 IGCSE Physics facts Flashcards
What is the difference between scalar and vector quantities?
Vectors have a direction as well as a magnitude (size)
Magnets can attract?
Magnetic materials (and other magnets too)
What are the disadvantages of hydroelectric power?
Floods a large area,
disrupts people and animals
Name some vector quantities
Velocity,
displacement,
acceleration,
force,
momentum,
moment,
current
What is the relationship between input and output power of a transformer?
Pprimary = Psecondary
IpVp = IsVs
What experiment can be done to demonstrate charging by friction?
Rub a plastic rod with a cloth, show charge on coulombmeter or repel/attract other charged things.
Rub a balloon on jumper / hair stick to wall.
Energy transferred per unit charge is known as?
Voltage
Magnets can attract or repel?
Other magnets
If the kelvin temperature of a gas doubles, what happens to the pressure it exerts?
Pressure doubles too
What are some advantages of digital signals?
Can carry more information
Easier to clean the signal (remove noise)
How can electrostatic charge cause a fire at a petrol station.
Charge builds up on car while driving
a spark when person touches car
+ fuel vapour = explosion
What are the advantages of hydroelectric power?
Renewable,
no air pollution,
low running costs, no fuel costs
Name some scalar quantities
Speed,
mass,
volume,
time,
energy,
charge,
pressure,
power
What is the difference between analogue and digital signals
Analogue signals can have any value.
Digital signals can ONLY be on or off
What are the advantages of geothermal power?
Renewable,
no air pollution,
low running costs, no fuel costs
Why is iron used as the core for a transformer?
Soft magnetic material; gains and loses magnetism easily.
What is conservation of momentum?
Momentum before a collision (or explosion) is equal to the momentum after.
Assuming no external forces act.
Describe the arrangement and motion of particles in a gas
No pattern;
Able to move freely/fast;
Larger space between particles;
What has the following magnetic field shape?
Field around a current carrying wire
What are the advantages of solar cells?
Renewable,
no air pollution,
low running costs, no fuel costs
What are the advantages of wind power?
Renewable,
no air pollution,
low running costs, no fuel costs
Which support provides more force? Why?
Moments about the person are equal.
A closer to person, so needs bigger force to provide same moment as B.
What is happening to this wave?
Diffraction; wave is spreading out
Describe the arrangement and motion of particles in a liquid
Irregular pattern;
Able to move over/past other particles;
Little space between particles;
What are the advantages of nuclear power?
Reliable (not weather dependent),
already established,
high power output
How does bending you knees help prevent injury?
Increases collision time,
lower deceleration (a=V/t),
lower force (F=ma)
What has the following magnetic field shape?
Field around a flat coil
(looks like an owl)
Why is the iron core in a transformer laminated?
Prevents eddy currents;
stops heating;
keeps efficiency high.
What are the general advantages of renewable sources of power?
Renewable,
no air pollution,
low running costs, no fuel costs
What change of state happens during condensing?
gas to liquid
What change of state happens during melting?
solid to liquid
A charged partical experience no force due to a magnetic field when?
Moving parallel to field