Draw the orbit of a comet around a star (2)
- elliptical orbit drawn
- star at focus of the eclipse (not the centre)
Rough diagram:
_________
.-‘ ‘-.
/ \
| ★ |
\ /
‘-._________.-‘
What is the gravitational field strength on earth. (for equations)
10
Explain why the gravitational field strength on the Moon is different from the
gravitational field strength on the Earth.(2)
- idea that earth and moon have different masses
- gravitational field strength is proportional
to mass - gravitational field strength on the Moon is
less
What is Power measured in
W
Watts
Explain the advantages of using a circuit breaker rather than a fuse
- idea the circuit breaker is faster (at isolating circuit)
- idea the circuit breaker is resettable (reusable)
give the unit for activity (radioactivity) (1)
- becquerels
- Bq
Describe what is meant by the term background radiation. (2)
- idea that background radiation is always present
- an appropriate example e.g.:
food
cosmic rays
rocks
Describe what is meant by the term Half-life
- time
- for halving of:
radioactivity
number of nuclei
How do magnetic field lines move in a magnetic field
North to South
What does each finger represent on Flemings left hand rule
thumb - force/thrust
first finger - points towards south(from north)
second finger - direction of current (from positive to negative)
Describe what is meant by the term total internal reflection. (2)
- idea that all light is reflected inside a medium
- for light travelling from a higher refractive index to a lower refractive index
- (when) angle (of incidence) is greater than critical angle
Define critical angle (2)
- It is the angle of incidence
- in the denser medium
- where the refracted ray is 90° to the normal.
To rise back to the surface, air is pumped into a storage tank inside the submarine.
Explain how the air exerts pressure on the walls of the storage tank.
- particles collide with wall
- particles exert force on wall
- more force exerted over an area means more pressure (P=F/A)
Describe the difference between the motion of particles in a transverse wave and
the motion of particles in a longitudinal wave.
- vibrations/ oscillations are
- parallel to direction of wave for longitudinal AND
(vibrations/oscillations) are perpendicular to direction of wave for transverse;
Describe what the student should do to improve the reliability of their results.
- repeat experiment
- calculate mean (for each variable).
State why a bar chart is a better choice than a line graph for this investigation
- material/data is categoric/discrete/ not continuous;
what is the main source of energy in stars?
- nuclear fusion
