P2.1,P2.2,P2.3,P2.4,P2.5 3.0 / 5 based on 2 ratings ? PhysicsP2.1 - P2.5GCSEAQA Created by: Rhiannon.notmanCreated on: 21-04-16 13:33 What two things does a force arrow tell us? Direction and magnitude of the force 1 of 37 What does Hookes law state? The extension of an elastic object is directly proportional to the force applied, provided that the limit of proportionality is not exceeded. 2 of 37 When an object falls through a liquid it will accelerate due to gravity, but what happens to the acceleration? it reduces as the resistive forces increase. 3 of 37 when a force makes an object move through a distance what is done to the object and what is it done against? work is done against friction 4 of 37 what is transferred when work is done? energy 5 of 37 describe what is meant by gravitational energy? GPE is the energy that an object has by virtue of its position in a gravitational field. 6 of 37 What is regenerative breaking? a technique where the car will use the energy used in braking to help charge the generator 7 of 37 what is the unit for momentum? kg m/s 8 of 37 what is the conservation of momentum? momentum before is equal to the momentum afterwards 9 of 37 explain how seatbelts and airbags stop serious injury in a car crash? increase the time taken to stop, reducing the rate of charge of momentum and reducing injury 10 of 37 Which part of an atom can move from object to object? electrons 11 of 37 how do objects become statically charged? by rubbing together 12 of 37 when 2 objects are rubbed together what charges do the objects become? opposite 13 of 37 if the object becomes positively charged what is lost? electrons 14 of 37 define current the rate of flow of charge 15 of 37 define potential difference the amount of energy transferred per unit of charge 16 of 37 How does a fuse work? increased current causes atoms to vibrate, this increases resistance and temperature causing the wire to snap therefore breaking the circuit 17 of 37 what is the unit for resistance? ohms 18 of 37 what can we say about the current in a series circuit? the same at every point 19 of 37 what can we say about the voltage in a series circuit? shared equally across components if the resistance of those components is the same 20 of 37 what can we say about the resistance in a series circuit? total resistance is found by adding all resistors 21 of 37 what can we say about the current in a parrallel circuit? splits at a junction depending on the resistance of the components 22 of 37 what can we say about the voltage in a parallel circuit? the voltage across each component is the same as the supply voltage 23 of 37 what can we say about the resistance in a parallel circuit? overall resistance decreases as more resistors are added. 24 of 37 Describe what is meant by frequency number of waves passing a point in one second 25 of 37 what is the name given to an atom that has lost or gained electrons ion 26 of 37 what causes ionisation? when an element is hit with electrons causing it to lose an electron 27 of 37 what is an isotope? it has the same number of protons and a different number of neutrons 28 of 37 when substances are unstable, what will they give out? radiation 29 of 37 what is background radiation? radiation that usually comes from natural sources around us 30 of 37 list some sources of background radiation rocks,buildings,food,nuclear accidents 31 of 37 what is an alpha particle? it has 2 protons and 2 neutrons 32 of 37 what is a beta particle? it has a fast moving electron 33 of 37 what is gamma radiation? electromagnetic radiation 34 of 37 what material can stop alpha, beta and gamma radiation? a=paper b=aluminium g=thich lead 35 of 37 what happens when alpha,beta and gamma travel through an electric field? alpha and beta are deflected but gamma is not 36 of 37 what is the half life? time it takes for the radioactive material to lose half its mass. or time it takes to reduce the activity by half 37 of 37
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