physics last minute.com

Question 1

summary of our solar system and the life cycle of a star (4)

Answer 1

plants orbit the sun
the sun was formed by dust and nebula pulled together by gravitational attraction
nuclear fusion takes place in the sun and all other stars
stars go through a life cycle, ending as a black dwarf, a neutron star or a black hole

Question 2

nuclear fission and fusion summary (4)

Answer 2

nuclear fission- splitting of large unstable nuclei
nuclear fission can cause a chain reaction to occur
nuclear fusion- the joining of two light nuclei to from a heavier nucleus
nuclear fusion occurs in stars

Question 3

magnets summary (4)

Answer 3

opposite poles of a magnet are attracted to each other
like poles of a magnet repel each other
a permanent magnet produces its own magnetic field, whereas an induced magnet becomes a magnet when place in a magnetic field
magnetic field is the area around a magnet

Question 4

black body raditation (4)

Answer 4

all bodies emit infrared radiation
all bodies absorb infrared radiation
a perfect black body is a theoretical object that is not possible in reality
the temperature of a body is related to the radiation absorbed and emitted

Question 5

lens summary (5)

Answer 5

lens form images by refracting light
convex- light refracts inwards
concave- light refracts outwards
distance from the lens to the principal focus is called the focal length
specular reflection- reflection from a smooth surface in a single direction
diffuse reflection
reflection from a rough surface causing scattering

Question 6

forces and breaking summary (3)

Answer 6

stopping distance= breaking distance add thinking distance
average reaction time is 0.2-0.9 seconds, and can be affected by drink drugs or tiredness
brakes increased friction between the tires and the road creating a breaking force