An object that slows down eg an acceleration of WS 1.2, MS 3b, 3c (decelerates) has a negative m/s2. –1.5 Recall and this equation. acceleration. WS 1.2, MS 4a, 4b, 4c, 4d, 4f, The acceleration of an object 5c can be calculated from the Relate changes and gradient of a velocity–time differences in motion to graph. appropriate velocity– time The distance travelled by an graphs, and interpret object can be calculated from slopes (HT only) and enclosed the area under a areas in such graphs. graph. 4.7.1.4 (HT only) Use the equation to 1 How does the acceleration of a find any unknown skydiver change through a cont. The following equation given the other values. jump? applies to uniform motion: Interpret questions to If a skydiver opens their (final velocity)2 (initial – find values not parachute and decelerates velocity)2 = 2 × acceleration specifically stated, eg does this mean they go × distance starts at rest means an upwards as when a car [v2 u2 = 2 a s] initial velocity of 0 m/s. decelerates it does not go – backwards? final velocity, v, in metres per second, m/s
An object that slows down (decelerates) has a negative acceleration. The acceleration of an object can be calculated from the gradient of a velocity–time graph. The distance travelled by an object can be calculated from the area under a graph. eg an acceleration of –1.5 m/s2. WS 1.2, MS 3b, 3c Recall and this equation. WS 1.2, MS 4a, 4b, 4c, 4d, 4f, 5c Relate changes and differences in motion to appropriate velocity– time graphs, and interpret slopes (HT only) and enclosed areas in such graphs. 4.7.1.4 cont. (HT only) The following equation applies to uniform motion: (final velocity)2 – (initial velocity)2 = 2 × acceleration × distance [v2 – u2 = 2 a s] final velocity, v, in metres per second, m/s Use the equation to find any unknown given the other values. Interpret questions to find values not specifically stated, eg starts at rest means an initial velocity of 0 m/s. 1 How does the acceleration of a skydiver change through a jump? If a skydiver opens their parachute and decelerates does this mean they go upwards as when a car decelerates it does not go backwards?
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