Speed and Acceleration Average and Instantaneous Speed
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1 Speed and Acceleration Average and Instantaneous Speed 1. A Average B Instantaneous C Instantaneous D Instantaneous E Instantaneous F Average 2. Measure the length of the track to find the distance she runs. Someone stands at the finish line with the stopwatch. When the race is started the stopwatch is started and stopped when the girl crosses the finish line. Speed is calculated from the distance of the race divided by the time the runner took. 3. The vehicle passes through the light gate. As it does so the card blocks the beam of light to the photocell. The computer measures the time the light is blocked. Speed can be calculated from the length of the card divided by the time the beam is blocked. 4. Average speed is measured in question 2 and instantaneous speed in question d = v t or d v t 6. (a) 2 5 metres per second (b) 50 metres per second (c) 15 seconds (d) 30 seconds (e) 960 metres (f) 36 metres seconds 8. (a) 14 3 metres per second (b) 800 seconds metres per second metres per second metres (36 kilometres) hours or 45 minutes. 1
2 Speed-Time Graphs 13. B rest, D travelling at a constant speed, A slowing down, C speeding up. 14. (a) (i) 3 metres per second (ii) 9 metres per second (b) 48 metres 15. (a) 0-10 seconds, cyclist accelerates, seconds, cyclist travels at a constant speed. (b) 140 metres (c) 3 5 metres per second metres 17. (a) Accelerates for 40 seconds then slows down for 10 seconds. (b) 125 metres Extension Questions 18. (a) 0 4 seconds (b) 77 5 metres per second. 19. Teacher A takes 1800 seconds, Teacher B takes 2000 seconds so Teacher A gets to school first. 20 Stefina is correct as the speedometer shows an instantaneous speed that the car is travelling at that moment in time. 21. (a) Measure the length of the track by laying the string along it then measuring the length of the string. Multiply by 10 to get the total distance travelled. (b) Time the car over 10 laps then divide the distance travelled by the time taken. (c) 1 25 metres per second (d) He could use a light gate and photocell attached to a computer. A card of known length would be attached to the car and when it breaks the beam the computer can calculate the speed from the length of the card divided by the time the light beam is broken. 2
3 Light Gates and Acceleration change in speed 22. (a) accelerati on = or a = v time taken for change t (b) The two cards give two speeds, an initial speed and a final speed. The computer also records the time interval between the two cards passing through the light gate. (c) The single card gives an initial speed as it passes through the the first light gate and a final speed as it passes through the second light gate. The time between passing through each light gate is also recorded by the computer. 23. (a) 4 metres per second per second (b) 5 metres per second per second (c) 3 metres per second per second (d) 25 metres per second (e) 20 metres per second (f) 20 metres per second (g) 11 seconds (h) 4 seconds (i) 8 seconds metres per second per second metres per second seconds 27. It is slowing down 28. (a) 0 5 metres per second per second (b) 100 s 29. (a) 2 metres per second per second (b) 0 8 metres per second per second (c) 2 metres per second per second (d) 0 04 metres per second per second (e) 0 metres per second per second 30. (a) (i) 6 metres per second (ii) 12 metres per second (b) 1 5 metres per second per second 3
4 Forces, Motion and Energy Newton s Laws of Motion Balanced and unbalanced forces 31. (a) There are no unbalanced forces acting on the ball so it remains at rest. (b) There is an unbalanced force exerted by the snooker cue so the ball accelerates in the direction of the force. 32. Its shape, speed and direction of travel can change. 33. (a) Negative acceleration of the cyclist. (b) Acceleration of the ball. (c) Cushion changes shape. (d) Negative acceleration of the ball. 34. (a) Ball accelerates in direction of stretched elastic. (b) No unbalanced force so no movement. (c) (i) Balanced forces (ii) Zero force. 35. (a) No. (b) Yes, to the right. (c) Yes, to the right. (d) Yes, to the left. (e) No. (f) Yes, to the right. 36. (a) Balanced. (b) Now unbalanced. (c) (i) Balanced. (ii) Air resistance, friction between tyres and road, friction in the engine and other moving parts. 37. (a) Friction due to water resistance. (b) The dolphin will travel at a constant speed. 38 A car starts on a journey and accelerates along a straight, flat road. The driving force from its engine must be greater than the force of air resistance acting on it. As it speeds up the force from the air resistance increases. The speed of the car will eventually become constant when the air resistance is the same as the engine force. 39. (a) The car will have a greater acceleration due to its smaller mass. (b) The engine producing a larger force will give the car greater acceleration. 40. (a) The acceleration will decrease. (b) The car will have greater acceleration. 4
5 41. (a) 20 newtons (b) 100 newtons (c) 10 metres per second per second (d) 10 metres per second per second (e) 5 kilograms (f) 50 kilograms newtons newtons metres per second per second kilograms 46. (a) 2000 newtons (b) (i) Friction is increased. (ii) Negative acceleration will be greater. Extension questions 47. (a) (i) 4 metres per second per second (ii) 3200 newtons (b) 3 2 seconds (c) The negative acceleration will be greater as the grit creates more friction between the tyres and the road surface. 48. (a) The vehicle passes through the light gate. As it does so the card blocks the beam of light to the photocell. The computer measures the time the light is blocked. Speed can be calculated from the length of the card divided by the time the beam is blocked. (b) 1 25 metres per second. (c) The single light gate is replaced by two light gates or the single card is replaced by a double card. This allows an initial and final speed to be found. The time between the two speed readings is also measured and acceleration calculated from change in speed divided by time. 49. (a) 2 metres per second per second (b) The disc floats on a cushion of air and as no surfaces rub together there is virtually no friction between the air bed surface and the disc. (c) (i) Initial acceleration followed by constant speed. (ii) 0 21 metres (iii) After 0 3 seconds. 5
6 Weight and Gravity 50. Pupil A should state that weight is measured in newtons Pupil B makes the correct statement. Pupil C should state that mass is a measure of the amount of matter in an object newtons per kilogram 52. weight = mass gravitational field strength w = m g 53. (a) 9 8 newtons (b) 4 9 newtons (c) 39 2 newtons (d) 1 kilograms (e) 5 kilograms (f) 3 06 kilograms 54. (a) Her mass is 50 kilograms. (b) 490 newtons newtons 56. (a) 7 84 newtons (b) 1 28 newtons newtons Extension questions 58. (a) 644 newtons (b) (i) 588 newtons (ii) 1560 newtons (c) 7 kilograms (d) 56 5 newtons Space exploration 59. (a) 60 years ago. (b) Satellites are used to allow mobile phones to function and for the transmission of satellite broadcasts such as Sky television. (c) There are many more employed in industries which are spin-offs of space exploration. (d) Satellites high above the Earth can accurately map the ground below. 60. (a) There is a lot of friction with the Earth s atmosphere due to the high speed of the shuttle. (b) It is covered in heat resistant tiles which are thicker on the underside where most heat is produced. 6
7 61. The edge of the wing will have become very hot and been so badly damaged that it caused the shuttle to break up. 62. (a) The period of the orbit. (b) (i) It will take longer. (ii) It will take less time. (c) (i) A geostationary satellite. (ii) Telecommunications, transmitting TV signals, weather observation. 63. (a) (i) It always remains above the same point on the Earth s surface. (ii) It will always have the same view of the Earth below with no missing data or images as it orbits the earth. (b) (i) It orbits at a lower height. (ii) The satellite is closer to the earth so its view will be over a smaller area. 64. (a) To receive the satellite signal. (b) To reflect the signals onto the receiver. (c) Use a larger dish. (d) antenna incoming signal 65. (a) It orbits the earth at a fixed height, never getting any nearer or further away. (b) Geostationary (c) The orbit takes longer. Cosmology The Universe 66. (a) Solar system - a star and its associated planets. (b) Moon - a body revolving around a planet. (c) Planet - a body revolving around a star. (d) Sun - the star at the centre of our solar system. (e) Galaxy - a grouping of solar systems. (f) Universe - all the matter that we know of. (g) Star - a ball of burning gas at the centre of a solar system. (h) Exoplanet - a planet orbiting a star outside our solar system. 7
8 67. It is the distance that light will travel in one year. 68. (a) seconds (b) metres minutes light years light years EXTENSION QUESTIONS 72. (a) A planet that is outside our solar system. (b) 12 light years. (c) The temperature on the planet surface would be too high. (d) The low gravitational field means that the atmosphere would escape into space. (e) There needs to be water and an atmosphere. 73. (a) Light and other waves in the electromagnetic spectrum. (b) 9 17 hours. (c) 158 days (d) Cosmic radiation, extremes of temperature and space debris and small meteorites. (e) The Milky Way. (f) (i) The distance light travels in one year. (ii) metres (g) This is impossible to say as it is constantly expanding. 8
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