The bus has to stop a few times. The figure below shows the distance time graph for part of the journey. Time in seconds
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1 HW Acceleration / 55 Name Q1.A bus is taking some children to school. The bus has to stop a few times. The figure below shows the distance time graph for part of the journey. Time in seconds How far has the bus travelled in the first 20 seconds? Distance travelled =... m (ii) Describe the motion of the bus between 20 seconds and 30 seconds. (iii) Describe the motion of the bus between 30 seconds and 60 seconds. Tick () one box. Accelerating Reversing Travelling at constant speed Tick () (iv) What is the speed of the bus at 45 seconds? Show clearly on the figure above how you obtained your answer. Speed =... m / s Later in the journey, the bus is moving and has J of kinetic energy. The brakes are applied and the bus stops. How much work is needed to stop the bus? Work =... J
2 (ii) The bus stopped in a distance of 25 m. Calculate the force that was needed to stop the bus. Force =... N (iii) What happens to the kinetic energy of the bus as it is braking? (Total 11 marks) Q2. The graph shows the speed of a runner during an indoor 60 metres race. Calculate the acceleration of the runner during the first four seconds. (Show your working.) How far does the runner travel during the first four seconds? (Show your working.) (Total 6 marks)
3 Q3. The graph shows changes in the velocity of a racing car. Describe the motion of the racing car during: the period labelled W; (ii) the period labelled Y Calculate the acceleration of the racing car during the period labelled X. Show clearly how you work out your answer and give the unit. Acceleration =... (4) (Total 6 marks) Q4. A person takes their dog for a walk. The graph shows how the distance from their home changes with time. Which part of the graph, A, B, C or D, shows them walking the fastest?
4 Write your answer in the box. Give the reason for your answer During the walk, both the speed and the velocity of the person and the dog change. How is velocity different from speed? (Total 3 marks) 5. The van shown above has a fault and leaks one drop of oil every second. The diagram below shows the oil drops left on the road as the van moves from W to Z. Describe the motion of the van as it moves from: W to X... X to Y... Y to Z... The van was driven for 20 seconds at a speed of 30m/s. Calculate the distance travelled.
5 Distance... m (c) The van was travelling at 30m/s. It slowed to a stop in 12 seconds. Calculate the van s acceleration. Acceleration... m/s² (Total 8 marks) Q6. The graphs in List A show how the velocities of three vehicles change with time. The statements in List B describe different motions. Draw one line from each graph in List A to the description of the motion represented by that graph in List B. List A Velocity time graphs List B Descriptions of motion Q7. The diagram shows an athlete at the start of a race. The race is along a straight track. (Total 3 marks) In the first 2 seconds, the athlete accelerates constantly and reaches a speed of 9 m/s. Use the equation in the box to calculate the acceleration of the athlete. Show clearly how you work out your answer Acceleration =... (ii) Which one of the following is the unit for acceleration? Draw a ring around your answer.
6 J/s m/s m/s 2 Nm (iii) Complete the following sentence. The velocity of the athlete is the... of the athlete in a given direction. (iv) Complete the graph to show how the velocity of the athlete changes during the first 2 seconds of the race. (Total 6 marks) Q8. A car is driven along a straight road. The graph shows how the velocity of the car changes during part of the journey. Use the graph to calculate the deceleration of the car between 6 and 9 seconds. Show clearly how you work out your answer and give the unit Deceleration =... At what time did the car change direction?... seconds (Total 4 marks)
7 Q10. The diagram shows four vehicles, A, B, C and D, travelling along a road. Which two of the vehicles, A, B, C or D, have the same velocity? Write your answers in the boxes. and Give the reason for your answer. (ii) Each of the quantities in the box is either a scalar or a vector quantity. acceleration distance force kinetic energy momentum time weight Complete the table by writing each of the quantities in the box in the correct column. One has already been done for you. Vector quantity Scalar quantity force... (6)
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