GCSE-Physics-575-Summer2019-Higher Tier, Unit 1-Paper.

General Certificate of Secondary Education 2019 GCSE Physics Unit 1 Higher Tier [GPY12] THURSDAY 30 MAY, AFTERNOON *GPY12* *GPY12* Centre Number Candidate Number *28GPY1202* *28GPY1202* 11770 1 (a) A jet aircraft requires a velocity of 70 m/s for a successful take-off. It reaches this velocity having started from rest and accelerating uniformly along the runway for a time of 14 seconds. (i) On the grid below, using suitable scales on both axes, draw the velocity–time graph to represent the motion. Velocity should be on the y-axis. [4] *28GPY1203* *28GPY1203* 11770 [Turn over (ii) Using the graph, or otherwise, calculate the acceleration of the jet during take-off. Show clearly how you get your answer, starting with the equation you plan to use. Acceleration = m/s2 [3] (iii) The total mass of the jet on take-off was 8.9 × 104 kg. Using your answer to part (ii) above, calculate the resultant forward thrust provided by the engines. Show clearly how you get your answer, starting with the equation you plan to use. Resultant forward thrust = N [3] *28GPY1204* *28GPY1204* 11770 (b) On reaching its destination the jet had a touchdown velocity of 55 m/s. The velocity–time graph below represents its motion in coming to a stop on the runway. The aircraft touches down at time = 0. 55 50 45 40 35 30 25 20 15 10 5 0 50 Time/s