P2
- Created by: Georgia Chater
- Created on: 10-12-12 19:24
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- PHYSICS 2
- Forces & Energy
- resultant force: combined effect of multiple forces
- To find speed use a distance time graph
- To find out acceleration and distance travelled use velocity time graph.
- For energy to be transferred work must be done.
- Momentum= mass x velocity
- It is conserved when object collides if no external forces act on it
- Moving objects have a terminal velocity when drag forces match driving forces
- Static electricty
- To charge insulated materials you rub them.
- They gain or lose electrons
- Opposites attract
- To charge insulated materials you rub them.
- Electrical circuits
- Electrical current: flow of charge
- Series circuit
- Current same throughout
- Potential difference shared between components
- Add each component for resistance
- Parallel circuits
- current is shared between branch
- Potential difference is is same at each branch
- Energy transferred: P.D supplied x charge
- Main electricity & Power of electrical appliances
- 3 pin plug
- Neutral wire: Blue
- Earth wire: Green and yellow
- Live wire: Brown
- Energy transferred: P.D x charge
- A.C : alternating current (Mains supply)
- D.C: direct current (Batteries)
- Power: P.D x current
- Energy transferred/time
- Earth wires, fuses and RCCBs protect user and appliance
- 3 pin plug
- Atomic structure & Radioactivity
- Radioactive materials emit ionising radiation from nucleus
- Half life: Time taken for count rate of sample to decrease by half
- Alpha, Beta, Gamma radiation
- Background radiation comes from natural sources (rocks) and man-made sources (medical uses)
- Ions: atoms that have lost/ gained electrons
- Isotopes have the same number of protons but different amount of neutrons
- Nuclear fission /fusion
- Nuclear fission is splitting up of a nucleus
- Fusion is when 2 nuclei join together
- Fission of uranium 235/ plutonium 239 during a chain reaction releases energy
- Stars have a life cycle. Nuclear fusion in stars releases energy and produces the naturally formed elements.
- Forces & Energy
- D.C: direct current (Batteries)
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