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Unit 2 Physics - Revision Checklist
You should be able to …..
Describing Motion
• Draw and interpret distance-time graphs.
• Draw and interpret velocity-time graphs.
• State the difference between speed and velocity.
• Use the equation: acceleration = change in velocity/time taken.
• (Higher Tier) Work out the acceleration and distance travelled from a velocity-time
graph.
Balanced and Unbalanced Forces
• Use the equation: weight = mass x gravitational field strength.
• Know what is meant by a resultant force.
• Calculate the resultant force acting on an object.
• Say what will happen to an object if the resultant force acting on it is zero.
• Say what will happen to an object if the resultant force acting on it is not zero.
• Use the equation: force = mass x acceleration.
• Say what the stopping distance of a vehicle depends on, in terms of a driver’s
reaction time and the braking of the vehicle.
• Say what affects a driver’s reaction time (thinking distance).
• Say what affects a vehicle’s braking distance.
• Explain why an object falling through a fluid (eg air) reaches a terminal velocity, in
terms of the forces acting on it.
• Draw and interpret velocity-time graphs for objects that reach terminal velocity.
Doing Work
• Use the equation: work done = force x distance moved.
• Understand that when work is done energy is transferred.
• (Higher Tier) Use the equation:
Kinetic energy = ½ x mass x (speed)2.
• Know what is meant by elastic potential energy.
• Know what energy change takes place when work is done against frictional forces.
Momentum
• Use the equation: momentum = mass x velocity
• Understand the law of conservation of momentum when applied to
collisions/explosions.
• Use the conservation of momentum to calculate the mass, velocity or momentum of
a body involved in a collision or an explosion.
• Use ideas of momentum to explain safety features.
• (Higher Tier) Use the equation:
Force = change in momentum/time taken for change.
• (Higher Tier) Use the equation above to explain how injuries can be reduced eg use
of seat belts, air bags in cars.
Static Electricity
• Describe how an object becomes charged in everyday situations, given appropriate
information, and how precautions can be taken to make sure that electrostatic
charge is discharged safely.
• Describe how devices like photocopiers and smoke precipitators work, using ideas of
static electricity, given appropriate diagrams.
• Explain how an insulator can be charged by rubbing in terms of movement of
electrons.
• Know what the attraction/repulsion rules are for charges.
• Know what the connection between current and electrical charge is.
• (Higher Tier) Use the equation: charge = current x time
• (Higher Tier) Use the equation: energy transformed = potential difference x charge.
• Say how to discharge a charged object.
• (Higher Tier) Say how a spark may occur between a charged object and an earthed
conductor.
Electrical Circuits
• Interpret and draw circuit diagrams using standard symbols.
• Remember the standard symbols for switch, cell, battery, diode, resistor, variable
resistor, lamp, fuse, voltmeter, ammeter, thermistor, LDR.
• Remember the shape of the current-voltage graphs for resistor at constant
temperature, filament lamp and diode and be able to interpret the graphs.
• Use the equation: potential difference = current x resistance.
• Know and apply the rule for current in a series circuit.
• Know and apply the rule for current in a parallel circuit.
• Know and apply the rule for potential difference in a series circuit.
• Know and apply the rule for potential difference in a parallel circuit.
• Know and apply the rule for resistors in a series circuit.
• (Higher Tier) Use the equation: charge = current x time
• (Higher Tier) Use the equation: energy transformed = potential difference x charge.
• Know the connection between power of an electrical device and the energy
transformed.
• Use the equation: power = current x potential difference.
Mains Electricity
• Know what voltage of the UK mains supply is.
• Explain why mains electricity is dangerous if not used safely, given appropriate
information.
• Know how to correctly label a 3-pin plug.
• Know what materials are used for a plug and why they are used.
• Recognise errors in the wiring of a plug.
• Explain what is meant by alternating current, and name a source of a.c.
• Explain what is meant by direct current, and name a source of d.c.
• Know what the mains frequency is and what this means.
• Know what the purpose of a fuse is and how it works.
• Calculate the size of a fuse that an appliance needs, given its power and the mains
p.d. by using the equation: power = potential difference x current
• Describe how the Earth connection in an appliance with a metal casing works as a
safety device, given an appropriate diagram.
• Know how to work out the peak p.d and frequency of an a.c. supply from diagrams
of oscilloscope traces.
• Know how to work out the p.d. of a d.c. supply from diagrams of oscilloscope traces.
• (Higher Tier) Interpret diagrams of p.d. against time for live and neutral terminals.
Radioactive Decay
• (Higher Tier) Describe the plum pudding model of the atom.
• (Higher Tier) Describe the nuclear model of the atom.
• (Higher Tier) Describe the Rutherford scattering experiments.
• (Higher Tier) Explain how the scattering experiments led to the nuclear model.
• Know the relative masses and relative electric charges of protons, neutrons and
electrons.
• Know the connection between number of electrons and protons for neutral atoms.
• Know what an ion is and how it is formed.
• Know what defines an element in terms of the number of protons.
• Know what isotopes are.
• Know what is meant by the atomic number and mass number.
• Know what happens to the number of protons and neutrons in a nucleus when it
gives off an alpha particle or beta particle.
• Know what happens to the mass number and atomic number of a radioactive
element when it decays by alpha or beta radiation.
• Know what the origins of background radiation are.
Nuclear Fission and Nuclear Fusion
• Know the names of 2 common fissionable substances.
• Know what nuclear fission means, and how it can be started.
• Explain how a fission chain reaction can occur by drawing a labelled diagram.
• Know what nuclear fusion means and where in the universe it happens.
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