| Question | Answer |
| How does the speed of a vehicle effect the force needed when braking? | Faster the vehicle, the greater the force required on the brakes to stop in a certain distance
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How do you calculate the resultant force? | Add all forces acting on the system together
| Massx Acceleration= | Resultant Force
| On a distance/time graph, you can calculate the speed by? | Working out the gradient of the line
| On a velocity/time graph, you can calculate the acceleration by? | Working out the gradient of the line
| What are the units for acceleration? | m/s2
| How do you calculate acceleration? | change in velocity/time taken
| What equation links Current, power and potential difference? | P=IV
| What do we mean when we say a device transforms energy? | changes it from one form to another Eg kinetic to sound
| H - What is the triangle which links time, current and charge in coulombs? | Q=IT
| H - What is a coulomb? | 6.4 billion billion electrons
| H - What is one amp in electrons? | 6.4 billion billion electrons passing a point each second
| What is an isotope? | an element with a different number of neutrons
| Where does background radiation come from? | cosmic rays, medical procedures, air, food and drink, ground (any one of these for one mark)
| What is the plum pudding model? | Electrons randomly distributed within the atom
| Give an example of an isotope used in a nuclear reactor? | uranium 235, plutonium239
| Whats the difference between fusion and fission? | Fusion joins small nuclei Eg H to make He, fission is the breakdown of large unstable nuclie, like in a nuclear reactor
| How does a chain reaction occur in a nuclear reactor - draw a picture. | see board for answer
| Draw and explain PD current graphs for a lamp and a diode | see board
| How many volts is the UK mains supply? | 240V
| How do materials that are insulators become statically charged? | Electrons are rubbed off the surface which means that the surface becomes positive and the thing doing the rubbing becomes negative due to the electrons |
