P2a Force, Acceleration and Graphs

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1 P2a Force, Acceleration and Graphs 37 minutes 37 marks 90% - A* 80% - A 70% - B 60% - C 50% - D 40% - E 30% - F 20% - G Page 1 of 11

2 Q1. (a) The diagram shows two forces acting on an object. What is the resultant force acting on the object? Tick ( ) one box. 8 N to the right 8 N to the left 4 N to the right 4 N to the left Page 2 of 11

3 (b) BASE jumpers jump from very high buildings and mountains for sport. The diagram shows the forces acting on a BASE jumper in flight. The BASE jumper is wearing a wingsuit. (i) Draw a ring around the correct answer in the box to complete each sentence. smaller than The BASE jumper accelerates forwards when force A is equal to force B. bigger than smaller than The BASE jumper falls with a constant speed when force C is equal to force D. bigger than Page 3 of 11

4 (ii) To land safely the BASE jumper opens a parachute. What effect does opening the parachute have on the speed of the falling BASE jumper? Give a reason for your answer. (Total 5 marks) Q2. A high-speed train accelerates at a constant rate in a straight line. The velocity of the train increases from 30 m/s to 42 m/s in 60 seconds. (a) (i) Calculate the change in the velocity of the train. Change in velocity =... m/s (ii) Use the equation in the box to calculate the acceleration of the train. Show clearly how you work out your answer and give the unit. Choose the unit from the list below. m/s m/s 2 N/kg Nm Acceleration =... Page 4 of 11

5 (b) Which one of the graphs, A, B or C, shows how the velocity of the train changes as it accelerates? Write your answer, A, B or C, in the box. A B C Graph (Total 4 marks) Q3. In a science lesson, some children float an apple on some water. One of the children says: The apple is not moving. That means that there cannot be any forces acting on it. Do you agree? Explain your answer as fully as you can (Total 3 marks) Page 5 of 11

6 Q4. The graph shows the speed of a runner during an indoor 60 metres race. (a) Choose words from this list to complete the sentences below. moving at a steady speed speeding up slowing down stopped Part A of the graph shows that the runner is... Part B of the graph shows that the runner is... Part C of the graph shows that the runner is... (3) (b) Calculate the acceleration of the runner during the first four seconds. (Show your working.) (3) (Total 6 marks) Page 6 of 11

7 Q5. A cyclist goes on a long ride. The graph shows how the distance travelled changes with time during the ride. (i) Between which two points on the graph was the cyclist moving at the fastest speed?... (ii) State one way cyclists can reduce the air resistance acting on them (iii) How long did the cyclist stop and rest?... (iv) Write down the equation which links distance, speed and time.... (v) Calculate, in km/hr, the average speed of the cyclist while moving Average speed =... km/hr (3) (Total 7 marks) Page 7 of 11

8 Q6. The diagram shows the velocity-time graph for an object over a 10 second period. (a) Use the graph to calculate the distance travelled by the object in 10 seconds. Show clearly how you work out your answer Distance =... m Page 8 of 11

9 (b) Complete the distance-time graph for the object over the same 10 seconds. (Total 4 marks) Q7. The graph shows the speed of a runner during an indoor 60 metres race. Page 9 of 11

10 (a) Calculate the acceleration of the runner during the first four seconds. (Show your working.) (3) (b) How far does the runner travel during the first four seconds? (Show your working.) (3) (c) At the finish, a thick wall of rubber foam slows the runner down at a rate of 25 m/s 2. The runner has a mass of 75kg. Calculate the average force of the rubber foam on the runner. (Show your working.) Answer... newtons (N) (Total 8 marks) Page 10 of 11

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