AQA P2.1.2 Forces and motion
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1 AQA P2.1.2 Forces and motion 90 minutes 90 marks Page 1 of 23
2 Q1. The graph shows the distance a person walked on a short journey. (a) Choose from the phrases listed to complete the statements which follow. You may use each statement once, more than once or not at all. standing still walking at constant speed walking with an increasing speed walking with a decreasing speed (i) Between points A and B the person is... (ii) Between points B and C the person is... (b) Complete the sentence. You can tell that the speed of the person between points A and B is... than the speed between points C and D because (c) Write the equation which relates distance, speed and time.... (Total 5 marks) Page 2 of 23
3 Q2. (a) A driver may have to make an emergency stop. Stopping distance = thinking distance + braking distance. Give three different factors which affect the thinking distance or the braking distance. In your answer you should explain what effect each factor has on the stopping distance (6) (b) Complete the following sentences by writing in the two missing words. Acceleration is the rate of change of.... The acceleration of a car depends on the force applied by the engine and the... of the car. Page 3 of 23
4 (c) A car moves because of the force applied by the engine. Name two other forces which act on the car when it is moving. Give the direction in which each of these factors acts. 1. Name of force... Direction of this force Name of force... Direction of this force... (4) (d) Complete the following sentence by writing in the missing word. The velocity of a car is its speed in a particular... (Total 13 marks) Q3. This question is about a car travelling through a town. (a) The graph shows how far the car travelled and how long it took. Page 4 of 23
5 (i) Between which points was the car travelling fastest? Tick ( ) your answer. Points Tick ( ) A B B C C D D E E F (ii) Between which points was the car stationary? (b) Complete the sentences by writing the correct words in the spaces. When a car has to stop, the overall stopping distance is greater if: the car is poorly maintained; there are adverse weather conditions; the car is travelling... ; the driver s reactions are.... Also, the greater the speed of the car, then the greater the braking... needed to stop in a certain time. (3) (Total 5 marks) Q4. (a) A shopping trolley is being pushed at a constant speed. The arrows represent the horizontal forces on the trolley. Page 5 of 23
6 (i) How big is force P compared to force F?... (ii) Which one of the distance-time graphs, K, L or M, shows the motion of the trolley? Draw a circle around your answer. (b) Complete the sentence by crossing out the two words in the box that are wrong. Acceleration is the rate of change of (c) Three trolleys, A, B and C, are pushed using the same size force. The force causes each trolley to accelerate. Which trolley will have the smallest acceleration?... Give a reason for your answer.... (Total 5 marks) Page 6 of 23
7 Q5. A horse and rider take part in a long distance race. The graph shows how far the horse and rider travel during the race. (a) What was the distance of the race? distance =... km (b) How long did it take the horse and rider to complete the race?... (c) What distance did the horse and rider travel in the first 2 hours of the race? distance =... km (d) How long did the horse and rider stop and rest during the race?... (e) Not counting the time it was resting, between which two points was the horse moving the slowest?... and... Give a reason for your answer (Total 6 marks) Page 7 of 23
8 Q6. A car and a bicycle are travelling along a straight road. They have stopped at road works. The graph shows how the velocity of the car changes after the sign is changed to GO. (a) Between which two points on the graph is the car moving at constant velocity?... (b) Between which two points on the graph is the car accelerating?... (c) Between the sign changing to GO and the car starting to move, there is a time delay. This is called the reaction time. (i) What is the reaction time of the car driver? Reaction time =... seconds Page 8 of 23
9 (ii) Which one of the following could increase the reaction time of a car driver? Tick the box next to your choice. Drinking alcohol Wet roads Worn car brakes (d) The cyclist starts to move at the same time as the car. For the first 2 seconds the cyclist s acceleration is constant and is greater than that of the car. Draw a line on the graph to show how the velocity of the cyclist might change during the first 2 seconds of its motion. (Total 6 marks) Q7. The diagram shows the forces on a small, radio-controlled, flying toy. (a) (i) The mass of the toy is 0.06 kg. Gravitational field strength = 10 N/kg Use the equation in the box to calculate the weight of the toy. weight = mass gravitational field strength Show clearly how you work out your answer and give the unit Weight =... (3) Page 9 of 23
10 (ii) Complete the following sentence by drawing a ring around the correct line in the box. When the toy is hovering stationary in mid-air, the lift force is bigger than the same as the weight of the toy. smaller than (b) When the motor inside the toy is switched off, the toy starts to accelerate downwards. (i) What does the word accelerate mean?... (ii) What is the direction of the resultant force on the falling toy?... (iii) Does the momentum of the toy increase, decrease or stay the same?... Give a reason for your answer.... (Total 8 marks) Page 10 of 23
11 Q8. Part of a bus route is along a high street. The distance time graph shows how far the bus travelled along the high street and how long it took. (a) The bus travels the slowest between points D and E. How can you tell this from the graph? (b) Between which two points was the bus travelling the fastest? Put a tick ( ) in the box next to your answer. Points A B B C C D (c) There is a bus stop in the high street. This is marked as point B on the graph. (i) What is the distance between point A on the graph and the bus stop? Distance... metres Page 11 of 23
12 (ii) How long did the bus stop at the bus stop? Show clearly how you work out your answer.... Time =... seconds (d) A cyclist made the same journey along the high street. The cyclist started at the same time as the bus and completed the journey in 200 seconds. The cyclist travelled the whole distance at a constant speed. (i) (ii) Draw a line on the graph to show the cyclist s journey. After how many seconds did the cyclist overtake the bus? The cyclist overtook the bus after... seconds. (Total 8 marks) Page 12 of 23
13 Q9. 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 (Total 3 marks) Page 13 of 23
14 Q10. (a) (i) The diagram shows three vehicles travelling along a straight road at 14 m/s. Which vehicle has the greatest momentum?... Give the reason for your answer. (ii) Use the equation in the box to calculate the momentum of the motorbike when it travels at 14 m/s. momentum = mass velocity Show clearly how you work out your answer. Momentum =...kg m/s (b) The motorbike follows the lorry for a short time, and then accelerates to overtake both the lorry and van. (i) Complete the following sentence by drawing a ring around the correct line in the box. When the motorbike starts to overtake, the kinetic energy decreases. of the motorbike stays the same. increases. Page 14 of 23
15 (ii) Give a reason for your answer to part (b)(i). (iii) The graph shows the velocity of the motorbike up to the time when it starts to accelerate. The motorbike accelerates constantly, going from a speed of 14 m/s to a speed of 20 m/s in a time of 2 seconds. The motorbike then stays at 20 m/s. Complete the graph to show the motion of the motorbike over the next 4 seconds. (3) (Total 9 marks) Q11. 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 Page 15 of 23
16 (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 =... (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) Page 16 of 23
17 Q12. The diagram, which is not to scale, shows two satellites, L and M, orbiting the Earth. (a) Complete the following table. Each letter, L or M, may be used once, more than once, or not at all. Statement about the satellite Letter for the satellite It is used as a monitoring satellite. It is a geostationary satellite. It takes 24 hours to complete its orbit. (b) Complete the following sentence. To stay in its present orbit around the Earth, each satellite must move at a particular.... Page 17 of 23
18 (c) Thousands of satellites are now in orbit around the Earth. A student used the internet to collect information about some of them. Name of satellite Average distance from the centre of the Earth in kilometres Speed in kilometres per second Time taken to orbit the Earth The Moon days GEO day Navstar hours Lageos hours HST mins ISS mins (i) The Moon takes a longer time than any of the other satellites to orbit the Earth. Give one other way in which the Moon is different from the other satellites in the table. (ii) What conclusion on the relationship between the average distance and speed can the student come to on the basis of this data? (Total 5 marks) Page 18 of 23
19 Q13. Part of a bus route is along a high street. The distance-time graph shows how far the bus travelled along the high street and how long it took. Time in seconds (a) Between which two points was the bus travelling the slowest? Put a tick ( ) in the box next to your answer. Points Tick ( ) A B C D D E Give a reason for your answer Page 19 of 23
20 (b) The bus travels at 5 m/s between points A and B. The bus and passengers have a total mass of kg. Use the equation in the box to calculate the momentum of the bus and passengers between points A and B. momentum = mass x velocity Show clearly how you work out your answer Momentum =... kg m/s (c) A cyclist made the same journey along the high street. The cyclist started at the same time as the bus and completed the journey in 220 seconds. The cyclist travelled the whole distance at a constant speed. (i) (ii) Draw a line on the graph to show the cyclist s journey. After how many seconds did the cyclist overtake the bus? The cyclist overtook the bus after... seconds. (Total 7 marks) Q14. Some students designed and built an electric-powered go-kart. The go-kart is shown below. (a) Suggest two changes that could be made to the design of the go-kart to increase its top speed Page 20 of 23
21 (b) A go-kart with a new design is entered into a race. The velocity-time graph for the go-kart, during the first 40 seconds of the race, is shown below. Time in seconds (i) Between which two points did the go-kart have the greatest acceleration? Tick ( ) one box. A B B C C D Give a reason for your answer. (ii) The go-kart travels at a speed of 13 m/s between points D and E. The total mass of the go-kart and driver is 140 kg. Calculate the momentum of the go-kart and driver between points D and E. Use the correct equation from the Physics Equations Sheet. Momentum =... kg m/s (Total 6 marks) Page 21 of 23
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