Forces checklist
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AQA TRILOGY Physics: Forces Checklist
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6.5.1 Forces and their interactions Identify and describe scalar quantities and vector quantities
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Identify and give examples of forces as contact or non-contact forces
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Describe the interaction between two objects and the force produced on each as a vector
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Describe weight and explain that its magnitude at a point depends on the gravitational field strength
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Calculate weight by recalling and using the equation: [ W = mg ]
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Represent the weight of an object as acting at a single point which is referred to as the object's ‘centre of mass’
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Calculate the resultant of two forces that act in a straight line
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HT ONLY: describe examples of the forces acting on an isolated object or system
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HT ONLY: Use free body diagrams to qualitatively describe examples where several forces act on an object and explain how that leads to a single resultant force or no force
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HT ONLY: Use free body diagrams and accurate vector diagrams to scale, to resolve multiple forces and show magnitude and direction of the resultant
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HT ONLY: Use vector diagrams to illustrate resolution of forces, equilibrium situations and determine the resultant of two forces, to include both magnitude and direction
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6.5.2 Work done and energy transfer Describe energy transfers involved when work is done and calculate the work done by recalling and using the equation: [ W = Fs ]
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Describe what a joule is and state what the joule is derived from
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Convert between newton-metres and joules.
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Explain why work done against the frictional forces acting on an object causes a rise in the temperature of the object
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6.5.3 Forces and elasticity Describe examples of the forces involved in stretching, bending or compressing an object
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Explain why, to change the shape of an object (by stretching, bending or compressing), more than one force has to be applied – this is limited to stationary objects only
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Describe the difference between elastic deformation and inelastic deformation caused by stretching forces
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Describe the extension of an elastic object below the limit of proportionality and calculate it by recalling and applying the equation: [ F = ke ]
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Explain why a change in the shape of an object only happens when more than one force is applied
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Describe and interpret data from an investigation to explain possible causes of a linear and non-linear relationship between force and extension
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Calculate work done in stretching (or compressing) a spring (up to the limit of proportionality) by applying, but not recalling, the equation: [ Ee= ½ke2 ]
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Required practical 18: investigate the relationship between force and extension for a spring
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6.5.4 Forces and motion Define distance and displacement and explain why they are scalar or vector quantities
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Express a displacement in terms of both the magnitude and direction
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Explain that the speed at which a person can walk, run or cycle depends on a number of factors and recall some typical speeds for walking, running, cycling
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Make measurements of distance and time and then calculate speeds of objects in calculating average speed for non-uniform motion
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Explain why the speed of wind and of sound through air varies and calculate speed by recalling and applying the equation: [ s = v t ]
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Explain the vector–scalar distinction as it applies to displacement, distance, velocity and speed
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HT ONLY: Explain qualitatively, with examples, that motion in a circle involves constant speed but changing velocity
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Represent an object moving along a straight line using a distance-time graph, describing its motion and calculating its speed from the graph's gradient
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Draw distance–time graphs from measurements and extract and interpret lines and slopes of distance–time graphs,
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Describe an object which is slowing down as having a negative acceleration and estimate the magnitude of everyday accelerations
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Calculate the average acceleration of an object by recalling and applying the equation: [ a = Δv/t ]
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Represent motion using velocity–time graphs, finding the acceleration from its gradient and distance travelled from the area underneath
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HT ONLY: Interpret enclosed areas in velocity–time graphs to determine distance travelled (or displacement)
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HT ONLY: Measure, when appropriate, the area under a velocity– time graph by counting square
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Apply, but not recall, the equation: [ v2 – u2 = 2as ]
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Explain the motion of an object moving with a uniform velocity and identify that forces must be in effect if its velocity is changing, by stating and applying Newton’s First Law
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Define and apply Newton's second law relating to the acceleration of an object
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Recall and apply the equation: [ F = ma ]
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HT ONLY: Describe what inertia is and give a definition
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Estimate the speed, accelerations and forces of large vehicles involved in everyday road transport
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Required practical 19: investigate the effect of varying the force on the acceleration of an object of constant mass, and the effect of varying the mass of an object on the acceleration
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Apply Newton’s Third Law to examples of equilibrium situations
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Describe factors that can effect a drivers reations time
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Explain methods used to measure human reaction times and recall typical results
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Interpret and evaluate measurements from simple methods to measure the different reaction times of students
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Evaluate the effect of various factors on thinking distance based on given data
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State typical reaction times and describe how reaction time (and therefore stopping distance) can be affected by different factors
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Explain methods used to measure human reaction times and take, interpret and evaluate measurements of the reaction times of students
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Explain how the braking distance of a vehicle can be affected by different factors, including implications for road safety
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Explain how a braking force applied to the wheel does work to reduce the vehicle's kinetic energy and increases the temperature of the brakes
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Explain and apply the idea that a greater braking force causes a larger deceleration and explain how this might be dangerous for drivers
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HT ONLY: Estimate the forces involved in the deceleration of road vehicles
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6.5.5 Momentum HT ONLY: Calculate momentum by recalling and applying the equation: [ p = mv ]
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HT ONLY: Explain and apply the idea that, in a closed system, the total momentum before an event is equal to the total momentum after the event
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HT ONLY: Describe examples of momentum in a collision
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