Module P3: Forces for Transport P3b: Changing Speed In this item the idea of acceleration is developed. The concept of velocity is introduced here, and is developed further in P5. Accelerations (involving the change in speed) of cars can be used and graphically illustrated and studied. GRADE G - D C GRADE B A* Targets for – Improvement Describe the trends in speed Describe, draw and interpret Describe, draw and interpret and time from a simple qualitatively, graphs of speed graphs of speed against time graph: against time for uniform including: horizontal line constant acceleration to include: quantitatively for uniform • – • straight line positive gradient greater acceleration shown acceleration • • increasing speed by a higher gradient calculations of distance – • straight line negative the significance of a positive travelled from a speed-time • • gradient decreasing speed. or negative gradient graph for uniform acceleration – calculations of distance calculations of acceleration • • travelled from a simple from a speed-time graph for graph for uniform uniform acceleration acceleration. qualitative interpretation of • graphs for acceleration. Recognise that acceleration Describe acceleration as Explain how acceleration can involves a change in speed change in speed per unit time involve either a change: (limited to motion in a straight and that: in speed • line): increase in speed results from in direction • • speeding up involves an a positive acceleration in both and direction. • • acceleration
Module P3: Forces for Transport P3b: Changing Speed In this item the idea of acceleration is developed. The concept of velocity is introduced here, and is developed further in P5. Accelerations (involving the change in speed) of cars can be used and graphically illustrated and studied. GRADE G - D C GRADE B – A* Targets for Improvement Describe the trends in speed and time from a simple graph: • horizontal line – constant • straight line positive gradient – increasing speed • straight line negative gradient – decreasing speed. Describe, draw and interpret qualitatively, graphs of speed against time for uniform acceleration to include: • greater acceleration shown by a higher gradient • the significance of a positive or negative gradient • calculations of distance travelled from a simple graph for uniform acceleration. Describe, draw and interpret graphs of speed against time including: • quantitatively for uniform acceleration • calculations of distance travelled from a speed-time graph for uniform acceleration • calculations of acceleration from a speed-time graph for uniform acceleration • qualitative interpretation of graphs for acceleration. Recognise that acceleration involves a change in speed (limited to motion in a straight line): • speeding up involves an acceleration Describe acceleration as change in speed per unit time and that: • increase in speed results from a positive acceleration Explain how acceleration can involve either a change: • in speed • in direction • in both and direction.
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