Flashcards

GCSE AQA Physics Unit 2 Flashcards

Gabi Germain Inglês 4,2Avaliação média 4,2 de 5 (11 avaliações) 63 flashcards

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1What does the gradient of a distance-time graph represent?speed
2What is velocity?Speed in a given direction
3What does the gradient of a velocity-time graph represent?Acceleration
4How do you work out the distance travelled?The area underneath a velocity-time graph
5What is newtons third law?Every action has an equal and opposite reaction
6What is the resultant force?The combined effect of all forces acting on an object
7What does the resultant force acting on an object make it do?Changes its state of rest or motion
8What happens if the resultant force acting on an object is zero?It is stationary
9If the resultant force is not zero what will happen to the object?The object will accelerate in the direction of the resultant force
10If 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
11If 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
12What is the acceleration of an object determined by?The resultant force acting on the object and the mass of the object
13When a vehicle travels at a steady speed the what balances the driving force?The resistive forces
14The greater the speed of a vehicle the ______ the braking force needed to stopGreater/Higher
15What is the stopping distance?Thinking distance + braking distance
16What is thinking distance?The distance the vehicle travels during the driver's reaction time
17What are three things that effect a drivers reaction time?tiredness, alcohols and drugs
18What 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
19How is the braking distance of a vehicle effected?weather conditions, brake condition and road condition
20The faster an object moves through a lfluid the________ the _________ that acts on itgreater, frictional force
21Why will an object accelerating through a liquid initially accelerate?Due to the force of gravity,
22What is terminal velocity?When the resultant force is zero, drag force is equal to force making it move
23What may cause an object to change its shape?a force acting on the object
24What will happen when a force is applied to an elastic object?the object will stretch and store elastic potential energy e.g. spring
25What is Hooke's law?The extension of a spring is directly proportional to the force applied provided the limit of proportionality is not exceeded
26What is transferred when work is done?Energy
27What is the conservation of momentum?In a closed system the total momentum before an event is equal to the total momentum after the event
28What happens when certain insulating materials are rubbed together?They become electrically charged
29What are rubbed off from on material to another?Negatively charged electrons
30What happens when two electrically charged objects are brought together?They exert a force on each other (repel or attract)
31—Diode
32—Fuse
33—Variable resistor
34—Thermistor
35What is this graph for?For a resistor at a constant temperature
36What are current-potential difference graphs used to show?How the current through a component varies with the potential difference across it
37The current through a resistor is directly proportional to what?The potential difference across the resistor
38The greater the resistance the _______ the currentSmaller
39What is the same across each component in series?The current
40What is the same in each component of a parallel circuit?Potential difference
41What does this graph show?The resistance of a filament bulb increases as the temperature of the filament bulb increases
42What does this graph show?The current through a diode goes in one direction and has a very high resistance in the reverse direction
43When does an LED emit light?When current flows through it in the forward direction
44When does the resistance of an LDR decrease?As light intensity increases
45When does the resistance of a thermistor decrease?As the temperature increases
46What is an alternating current?A current that is repeatedly changing direction
47What is direct current?Current that passes in only one direction
48In the UK what is the frequency of mains electricity?50Hz and is about 230V
49What 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)
50What is an RCCB?Residual Current Circuit Breaker
51What does the fuse do in a plug when the current exceeds the rating?It melts which breaks the circuit
52Which appliances usually have an earth wire?Ones with metal casing
53What happens when an electric charge flows through a resistor?It gets hot
54What is the basic structure of an atom?Protons, neutrons (nucleus) and electrons
55What is the relative mass of an electron?0.0005
56What is the relative mass of a proton or a neutron?1
57What is the relative charge of an electron?-1
58Does an atom have an overall charge?No
59How do atoms become ions?By losing or gaining electrons?
60What is an isotope?The atom of an element with the same number of protons but different numbers of neutrons
61Why is a substance said to be radioactive?substances that give out radiation from their nuclei of the atoms all the time
62What do alpha particles have in their nucleus?2 neutrons and 2 protons
63What does this represent?Beta decay