EXAM Flashcards
Explain 1 disadvantage caused by solar cells only facing one direction.
Solar cells don’t track the sun and won’t generate as much electricity.
When ball hit ground, energy is transferred from ball to earht. Explain the energy transfer.
Velocity after bounce is decreased, with the loss of kinetic energy. Means the ball has lost its energy as height from top of bounce is less than height dropped.
nuclear fusion is the joining together of …..
during nuclear fusion the totoal mass of the particles….
nuclei, decrease
Why were modeles tested befre starting to build?
To devlop understanding of process and to assess safety risk.
Explain 1 environmental effetc of genertaing electricity using fossil fuel
realses carbon dioxide which causes global warming.
Explain the effect of 2 other factors on braking distance of car. ( no speed include)
Braking distance of car can be effected due to, poor road surface as wet or icy road, amking the poor condiiton on tyres to be worn brakes. This is because decreased fricitin as it slows tyres to brake.
When rider reach bottom of slide, sled decerlates and stop. Give 2 factors that affect how far the sled will move before it stops.
Speed at bottom of slide and fricition between sled and ground.
LED lamps are much more effcient than filament lamp means?
LED lamp waste a smller proportion of input energy than filament lamp.
Why might filamenet inside a lamp melt when the lamp is first switched on?
The current goes too high.
Connecting 2 reisotrs in parall circuit, what happen to total resistance of circuit
Decrease because totoal resistance is always less than smallest indiivudal resistance.
Describe how to measure the volume of peice of rock.
- Fill displacement can with water
- Water levl with spout
- Place object in water
- Collect displaced water
- Measuring cyclinder use to determine volume of displace water.
2 envirnemntal issue caused be genertaing electricty using nuclear power ststaion
Waste is radioactive and is toxtic
why can parallel circuit operate wither 2 swithc
because switch in parallel so closiing either switch completes the circuit.
why the fricition between sock and carpet make studen charge
transfer of electrons fro the carpet to the student.
Negative charge student touch a metal tap and recive electric show why
because there is P.D between student and the tap which causes charge to transfer from the stuent.