2727786
Description
Flashcards by Gabi Germain, updated more than 1 year ago
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Created by Gabi Germain
over 10 years ago
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| Question | Answer |
| What does the gradient of a distance-time graph represent? | speed |
| What is velocity? | Speed in a given direction |
| What does the gradient of a velocity-time graph represent? | Acceleration |
| How do you work out the distance travelled? | The area underneath a velocity-time graph |
| What is newtons third law? | Every action has an equal and opposite reaction |
| What is the resultant force? | The combined effect of all forces acting on an object |
| What does the resultant force acting on an object make it do? | Changes its state of rest or motion |
| What happens if the resultant force acting on an object is zero? | It is stationary |
| If the resultant force is not zero what will happen to the object? | The object will accelerate in the direction of the resultant force |
| If the resultant force acting on a moving object is zero what happens to the object? | The object will continue to move at the same speed in the same direction |
| If the resultant force acting on a moving object is not zero what will happen to ? | The object will accelerate in the direction of the resultant force |
| What is the acceleration of an object determined by? | The resultant force acting on the object and the mass of the object |
| When a vehicle travels at a steady speed the what balances the driving force? | The resistive forces |
| The greater the speed of a vehicle the ______ the braking force needed to stop | Greater/Higher |
| What is the stopping distance? | Thinking distance + braking distance |
| What is thinking distance? | The distance the vehicle travels during the driver's reaction time |
| What are three things that effect a drivers reaction time? | tiredness, alcohols and drugs |
| What happens when the brakes of a vehicle are applied? | Work done by the friction force between the brakes and the wheel reduces kinetic energy of the vehicle and the temperature of the brakes increase |
| How is the braking distance of a vehicle effected? | weather conditions, brake condition and road condition |
| The faster an object moves through a lfluid the________ the _________ that acts on it | greater, frictional force |
| Why will an object accelerating through a liquid initially accelerate? | Due to the force of gravity, |
| What is terminal velocity? | When the resultant force is zero, drag force is equal to force making it move |
| What may cause an object to change its shape? | a force acting on the object |
| What will happen when a force is applied to an elastic object? | the object will stretch and store elastic potential energy e.g. spring |
| What is Hooke's law? | The extension of a spring is directly proportional to the force applied provided the limit of proportionality is not exceeded |
| What is transferred when work is done? | Energy |
| What is the conservation of momentum? | In a closed system the total momentum before an event is equal to the total momentum after the event |
| What happens when certain insulating materials are rubbed together? | They become electrically charged |
| What are rubbed off from on material to another? | Negatively charged electrons |
| What happens when two electrically charged objects are brought together? | They exert a force on each other (repel or attract) |
| Diode | |
| Fuse | |
| Variable resistor | |
| Thermistor | |
| What is this graph for? | For a resistor at a constant temperature |
| What are current-potential difference graphs used to show? | How the current through a component varies with the potential difference across it |
| The current through a resistor is directly proportional to what? | The potential difference across the resistor |
| The greater the resistance the _______ the current | Smaller |
| What is the same across each component in series? | The current |
| What is the same in each component of a parallel circuit? | Potential difference |
| What does this graph show? | The resistance of a filament bulb increases as the temperature of the filament bulb increases |
| What does this graph show? | The current through a diode goes in one direction and has a very high resistance in the reverse direction |
| When does an LED emit light? | When current flows through it in the forward direction |
| When does the resistance of an LDR decrease? | As light intensity increases |
| When does the resistance of a thermistor decrease? | As the temperature increases |
| What is an alternating current? | A current that is repeatedly changing direction |
| What is direct current? | Current that passes in only one direction |
| In the UK what is the frequency of mains electricity? | 50Hz and is about 230V |
| What are the three wires in a three pin plug and what colour are they? | Live wire (brown), neutral wire (blue) ant the Earth wire (yellow and green stripes) |
| What is an RCCB? | Residual Current Circuit Breaker |
| What does the fuse do in a plug when the current exceeds the rating? | It melts which breaks the circuit |
| Which appliances usually have an earth wire? | Ones with metal casing |
| What happens when an electric charge flows through a resistor? | It gets hot |
| What is the basic structure of an atom? | Protons, neutrons (nucleus) and electrons |
| What is the relative mass of an electron? | 0.0005 |
| What is the relative mass of a proton or a neutron? | 1 |
| What is the relative charge of an electron? | -1 |
| Does an atom have an overall charge? | No |
| How do atoms become ions? | By losing or gaining electrons? |
| What is an isotope? | The atom of an element with the same number of protons but different numbers of neutrons |
| Why is a substance said to be radioactive? | substances that give out radiation from their nuclei of the atoms all the time |
| What do alpha particles have in their nucleus? | 2 neutrons and 2 protons |
| What does this represent? | Beta decay |
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