Physics Paper 2 Flashcards
Describe the relationship between the current and the voltage as shown in the graph
- As the voltage increases so does the current
- However, they are not directly proportional
Explain why the resistance of the filament lamp changes as the voltage across it increases
- The resistance increases due to more collisions of electrons with other electrons
Describe, in terms of particles, two differences between a solid and a liquid of the same substance
- Particles in a solid are in regular arrangement while particles in a liquid are randomly arranged
- Particles in a liquid have more kinetic energy than particles in a solid
State two practical ways to reduce heat loss from a shed
- Plant trees around for wind break
- Properly close windows and doors
- Use double thickness of concrete
When it’s 0 degrees celsius, what is that in kelvin
273K
Draw two rectangles on Figure 6 to show the positions of the two bar magnets
Label the N-pole and the S-pole of each magnet
- Rectangles drawn sideways but not in contact
- The south poles are put facing each other on the nearest touching side of the magnets, and the north poles are facing away from each other on outer sides of magnet
The student wants to determine the shape of the magnetic field for a larger area around the magnets
Describe how the student should continue the investigation using just one
plotting compass
- Place a (plotting) compass on the paper (near to the magnets) and put a dot at each end of the needle
- Determine how the field
continues from that point by moving the compass until one end of the needle is just over the mark you made - Connect field lines to reveal overall shape by joining up the dots
The magnets are held the same distance apart but with the N-pole of one
magnet now facing the S-pole of the other magnet
State how the force would compare with the force before the change
- Same magnitude (distance) and opposite direction
Explain why the total amount of work done by a cyclist between points Q and R is different from the change in gravitational potential energy of the cyclist between points Q and R.
- Some work is done to overcome friction/ air resistance
- Energy is dissipated to the environment
The cyclists lubricated the chains and the wheel bearings of their bicycles
before setting off, Lubricating the chains and wheel bearings helps to
- Increase the efficiency of the
cyclist and bicycle
Explain why the wires to the battery in a car are thicker than the wires that
connect each device to its switch and its fuse.
- Thicker wires have lower resistance
- Less thermal energy is transferred so wires do not get hot
- So more current can be carried
Describe how a student could use this apparatus, and any additional items
needed, to determine the specific heat capacity of aluminium.
- Measure the temperature of the boiling water
- Allow sufficient time for block to reach temperature of boiling water
- Measure temperature of cold water in beaker using a thermometer for both boiling and cold water
- Transfer hot aluminium block to cold water in the beaker
- Work quickly to avoid thermal energy loss during transfer
- Measure temperature of water and Stir to ensure even distribution
- Calculate temp rise of water by subtracting initial from final temperature.
- Calculate temp drop of aluminium by subtracting final temperature from 100.
- Use a balance to the mass of everything
- Specific heat capacity of aluminium =
thermal energy transferred/
mass of Al × temp drop of Al
Describe how the student could determine the frequency of the ripples on the lake.
- count the number of waves
- passing a point in a
specific time - use frequency = number of waves/
time
State the SI unit for the activity of a radioactive source.
- Becquerels (Bq)
Which row of the table describes what happens to the wave velocity and to the
wavelength of the light when the light travels from air to glass?
- wave velocity and wavelength both decreases
The intensity (brightness) of the light at Q is less than the intensity of the light at P
Explain the decrease in intensity as the light travels from P to Q (refraction - downwards from above medium)
- some light is reflected
- some light is absorbed by the glass
Which of these graphs represents an object moving with a constant velocity of 2 m/s?
- Displacement at y
- time at x
- goes up in 2 at both axis
The force that the rocket engines produce remains constant during the first few seconds after take-off.
Explain what happens to the acceleration during the first few seconds.
- acceleration increases since F = ma
- and mass decreases due to burning fuel
State how the nucleus changes when emitting gamma rays
- becomes more stable