# National 4/5. Dynamics and Space

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1 North Berwick High School National 4/5 Department of Physics Dynamics and Space Section 1 Mechanics Problem Booklet

2 KINEMATICS PROBLEMS Speed, distance and time 1. A runner completes a 200 m race in 25 s. What is his average speed in m/s? 2. A friend asks you to measure his average cycling speed along flat road. Describe which measurements you would take and the measuring instruments you would use. 3. An athlete takes 4 minutes 20 s to complete a 1500 m race. What is the average speed? 4. On a fun run, a competitor runs 10 km in 1 hour. What is her average speed in a) km/h b) m/s? 5. Describe how you could measure the average speed of a car as it passes along the road outside your school/college. 6. Concorde can travel at 680 m/s (twice the speed of sound). How far will it travel in 25 s at this speed? 7. A girl can walk at an average speed of 2 m/s. How far will she walk in 20 minutes? 8. How long will it take a cyclist to travel 40 km at an average speed of 5 m/s? 9. How long (to the nearest minute) will the Glasgow to London shuttle take if it flies at an average speed of 220 m/s for the 750 km flight? 10. How long, to the nearest minute, will a car take to travel 50 km if its average speed is 20 m/s? 11. Look at this timetable for a train between Glasgow and Edinburgh: Station Time Distance from Glasgow Glasgow km Falkirk km Linlithgow km Edinburgh km a) What was the average speed for the whole journey in m/s? b) What was the average speed in m/s between Glasgow and Falkirk? c) Explain the difference in average speeds in a) and b).

3 12. Describe how you would measure the instantaneous speed of a vehicle as it reached the bottom of a slope. 13. In an experiment to measure instantaneous speed, these measurements were obtained:- Reading on timer = s Length of car = 5 cm Calculate the instantaneous speed of the vehicle in m/s. 14. A trolley with a 10 cm card attached to it is released from A and runs down the slope, passing through a light gate at B, and stopping at C. Time from A to B = 0.8 s. Time on light gate timer = s a) What is the average speed between A and B? b) What is the instantaneous speed at B? c) Explain the difference between the two speeds C 40 cm B 60 cm A

4 Vectors and Scalars 15. What is the difference between a vector quantity and a scalar quantity? 16. Use your answer to question 15 to explain the difference between distance and displacement. 17. A man walks from X to Y along a winding road. a) What is his displacement at the end of his walk? b) What distance has he walked? 18. If the walker in question 17 took 40 minutes for his walk, what was a) his average speed b) his average velocity? 19. One complete lap of a running track is 400m. An athlete completes one lap in 48 s in the 400 m race. What is his a) distance travelled b) displacement c) average speed d) average velocity. 20. Repeat Q 19 for a runner in the 800 m race whose winning time was 1 min 54 s. 21. A car travels 40 km north, then turns back south for 10 km. The journey takes 1 hour. What is a) the displacement of the car b) the distance the car has travelled c) the average velocity of the car (use km/h) d) the average speed of the car?

5 22. A car drives 60 km north, then 80 km east, as shown in the diagram. The journey takes 2 hours. Calculate the a) distance travelled b) displacement c) average speed d) average velocity. Acceleration 23. A Jaguar can reach 27 m/s from rest in 9.0 s. What is its acceleration? 24. The space shuttle reaches 1000 m/s, 45 s after launch. What is its acceleration? 25. A car reach 30 m/s from a speed of 18 m/s in 6 s. What is its acceleration? 26. A train moving at 10 m/s increases its speed to 45 m/s in 10 s. What is its acceleration? 27. A bullet travelling at 240 m/s hits a wall and stops in 0.2 s. What is its acceleration? 28. A car travelling at 20 m/s brakes and slows to a halt in 8 s. What is the deceleration? 29. Describe how you would measure the acceleration of a small vehicle as it runs down a slope in the laboratory. 30. On approaching the speed limit signs, a car slows from 30 m/s to 12 m/s in 5 s. What is its deceleration? 31. A bowling ball is accelerated from rest at 3 m/s 2 for 1.2 s. What final speed will it reach? 32. How long will it take a car to increase its speed from 8 m/s to 20 m/s if it accelerates at 3 m/s 2? 33. A cyclist is travelling at 4m/s then she accelerates at 0.5 m/s 2. How long will she take to reach 5.5 m/s?

6 34. The maximum deceleration a car s brakes can safely produce is 8 m/s 2. What will be the minimum stopping time if the driver applies the brakes when travelling at 60 mph (27 m/s). 35. The table below gives some performance figures for cars. Car Time for 0-60 mph max. speed in mph Mondeo 1.8 LX 10.2 s 122 Peugeot 106 XN s 103 Renalt Clio RL 14.3 s 95 Nissan Micra 1.0 S 15.2 s 89 Porsche Boxster 6.5 s 139 a) Which car has the smallest acceleration? b) Which car has the largest acceleration? c) Assuming that the acceleration remained constant, how long would it take for the following cars to reach their top speed? i) Mondeo ii) Porsche Velocity - time graphs 36. The graph below shows how the velocity of a car varies over a 40 s period. a) Describe the motion of the car during this 40 s period. b) Calculate the acceleration of the vehicle. c) How far does the car travel while accelerating? d) What is the total distance travelled by the car?

7 37. Use the graph below to answer the following questions. time in s a) During which time is the vehicle travelling at a constant velocity? b) Calculate the values of i) the initial acceleration ii) the final deceleration c) What is the braking distance of the car? d) What is the total distance travelled? e) What is the average velocity of the car? 38. Draw a velocity-time graph to describe the following motion:- A car accelerates from rest at 2 m/s 2 for 8 s, then travels at a constant velocity for 12 s, finally slowing steadily to a halt in 4 s. 39. For the vehicle in the previous question, what are the values of a) the maximum velocity b) the distance travelled c) the average velocity? 40. The graph below describes the motion of a cyclist. time in s a) What is the value of the maximum positive acceleration? b) Show by calculation whether the cyclist travels farther while accelerating, or while cycling at the maximum velocity.

8 Gravity, mass and weight The data table on the right may be required for questions Assume the questions refer to the Earth unless otherwise stated 41. What is the weight of a 10 kg bag of potatoes? Planet g (N/kg) 42. What is the weight of a 250 g bag of sweets? 43. What is the mass of a 450 N girl? 44. What is the weight of a 10,000 kg spacecraft on a) Earth b) Mars c) Venus? 45. What would a 60 kg man weigh on Jupiter? Mercury 3.7 Venus 8.8 Earth 10 Mars 3.8 Jupiter 26.4 Saturn 11.5 Uranus 11.7 Neptune Which planet s gravity is closest to our own? 47. An astronaut who weighs 700 N on Earth goes to a planet where he weighs 266 N. Calculate his mass and state which planet he was on. 48. What would an astronaut weigh on Earth, if his weight on Venus was 528 N?

9 DYNAMICS PROBLEMS Friction 49. Describe two methods of a) increasing friction b) decreasing friction. 50. Where, in a bicycle, is friction deliberately a) increased b) decreased? Balanced forces and Newton s First Law 51. The diagram shows the forces acting on a balloon as it rises. a) What will be the size of force A? b) If the balloon was falling at a constant velocity, what would be the size of force A? 52. The diagram below shows the forces acting on a car moving at constant velocity. a) What can you say about the unbalanced force acting on this car? b) How big is the engine force E? c) What is the weight of the car D?

10 53. Explain, using Newton s First Law, why passengers without seat belts in a stationary car are thrown forwards in the car, when the car stops suddenly. 54. Explain how a parachutist reaches a terminal velocity. Resultant forces 55. What is meant by the resultant force on an object? 56. What are the resultants of the following forces? 57. By using a scale diagram or otherwise, find the resultant of the following pairs of forces.

11 Newton s Second Law 58. What force is needed to accelerate a 5 kg mass at 3 m/s 2? 59. What will be the acceleration of a 12 kg mass acted on by a force of 30 N? 60. What mass would accelerate at 2 m/s 2 when acted on by a 12 N force? 61. What force will accelerate 250 g at 2 m/s 2? 62. What force would be needed to accelerate a 10 tonne lorry at 1.5 m/s 2? (1 tonne = 1000 kg) 63. Give two reasons why a car will have a smaller acceleration in similar conditions when a roof rack is added. 64. Describe an experiment to investigate the effect of varying the unbalanced force acting on a fixed mass. 65. A car of mass 1200 kg experiences friction equal to 500 N when travelling at a certain speed. If the engine force is 1400 N, what will be the car s acceleration? 66. A car of mass 2000 kg has a total engine force of 4500 N. The frictional drag force acting against the car is 1700 N. What is the acceleration of the car? 67. Two girls push a car of mass 1000 kg. Each pushes with a force of 100 N and the force of friction is 120 N. Calculate the acceleration of the car. 68. A boat engine produces a force of N and the friction and water resistance total 3500 N. If the mass of the boat is 2000 kg, what will be its acceleration? 69. A careless driver tries to start his car with the hand brake still on. The engine exerts a force of 2500 N and the hand brake exerts a force of 1300 N. The car moves off with an acceleration of 1.2 m/s 2. What is the mass of the car? 70. A car of mass 1200 kg can accelerate at 2 m/s 2 with an engine force of 3000 N. What must be the total friction force acting on the car? 71. A helicopter winches an injured climber up from a mountainside. The climber s mass is 65 kg. a) What is the weight of the climber? b) If he is accelerated upwards at 1.0 m/s 2, what unbalanced force is required? c) What total upwards force must be produced by the helicopter?

12 72. An 800 kg car is accelerated from 0 to 18 m/s in 12 seconds. a) What is the resultant force acting on the car? b) At the end of the 12 s period the brakes are operated and the car comes to rest in a time of 5 s. What is the average braking force acting on the car? Acceleration due to gravity and gravitational field strength 73. On the moon, where the gravitational field strength is 1.6 N/kg, a stone falls and takes 1.5 s to reach the surface. What is its velocity as it hits the surface of the moon? Projectiles 74. A stone thrown horizontally from a cliff lands 24 m out from the cliff after 3 s. Find: a) the horizontal speed of the stone b) the vertical speed at impact. 75. A ball is thrown horizontally from a high window at 6 m/s and reaches the ground after 2 s. Calculate: a) the horizontal distance travelled b) the vertical speed at impact. 76. An aircraft flying horizontally at 150 m/s, drops a bomb which hits the target after 8 s. Find: a) the distance travelled horizontally by the bomb b) the vertical speed of the bomb at impact c) the distance travelled horizontally by the aircraft as the bomb fell d) the position of the aircraft relative to the bomb at impact.

13 77. A ball is projected horizontally at 15 m/s from the top of a vertical cliff. It reaches the ground 5 s later. For the period between projection until it hits the ground, draw graphs with numerical values on the scales of the ball s a) horizontal velocity against time b) vertical velocity against time c) From the graphs calculate the horizontal and vertical distances travelled. 78. In the experimental set-up shown below, the arrow is lined up towards the target. As it is fired, the arrow breaks the circuit supplying the electromagnet, and the target falls downwards from A to B. target a) Explain why the arrow will hit the target. b) Suggest one set of circumstances when the arrow would fail to hit the target (you must assume it is always lined up correctly).

14 Newton s Third Law 79. State Newton s Third Law. 80. Identify the Newton pairs in the following situations. Work and Energy 81. Copy and complete these examples of energy transformations. a) Car moving at a steady speed along level road chemical energy -> b) Car accelerating along level road chemical energy -> + c) Car braking kinetic energy -> d) Car freewheeling downhill ( engine switched off ) -> A locomotive exerts a pull of N to pull a train a distance of 400 m. How much work is done? 83. A gardener does 1200 J pushing a wheelbarrow with a force of 100 N. How far did she push the barrow? 84. A man uses up 1000 J by pulling a heavy load for 20 m. What force did he use? 85. A girl is pushing her bike with a force of 80 N and uses up 4000 J of energy. How far did she push the bike?

15 86. A man weighing 600 N climbs stairs in an office block which are 40 m high. How much work does he do? 87. A worker pushes a 4 kg crate along the ground for 3 m using a force of 20 N, then lifts the crate up to a ledge 1 m high. How much work does he do altogether? Work, Power and Time 88. A man pushes a wheelbarrow for 60 m using a 50 N force. If he takes 10 s, what is his average power? 89. The man s son pushes the wheelbarrow for 60 m using the same force as his father, but he takes 13 s to do it. How does a) his work b) his power compare to his father s? 90. A machine lifts a load of 4000 N to a height of 5 m in 20 s. What is its power? 91. A boy who weighs 600 N can run up stairs of vertical height 8 m in 12 s. a) What is his power? b) A girl who weighs 500 N takes 10 s to run up the stairs. What is her power? c) Do they do equal amounts of work? 92. Describe how you could estimate the average power of a student who is running up a flight of stairs. List measurements you would take, how you would obtain these, and indicate how you would calculate the result. 93. A lift can raise a total mass of 800 kg up 10 m in 40 s. What is its power? 94. A weight lifter lifts a mass of 250 kg from the ground to a height of 1.5 m in a time of 2 seconds. What was his average power during the lift? 95. A lift in a building can take a maximum of 10 people of average mass 70 kg. The mass of the lift is 500 kg. a) What is the total weight of a full lift? b) What is the power needed to raise the full lift up 30 m in 10 s? 96. A bucket of water of weight 250 N is to be lifted up a 30 m well by a 500 W motor. How long will it take to raise the bucket?

16 97. a) What will be the power of the electric motor of a lift which can raise a load of 4000 N at a steady speed of 2 m/s? b) What is the energy transformation? Gravitational potential energy 98. A chairlift raises a skier of mass 60 kg to a height of 250 m. How much potential energy does the skier gain? 99. A brick of mass 3 kg rests on a platform 25 m above the ground on a building site. a) How much potential energy is stored in the brick? b) If the brick falls 25 m to the ground, how much potential energy will it lose? c) What form of energy will the brick gain? 100. Estimate how much gravitational potential energy you would gain if you were lifted 30m up to the top of a fun-ride An apple, mass 100 g, has 300 J of potential energy at the top of the Eiffel Tower. What is the height of the Eiffel Tower? 102. An astronaut of mass 70 kg climbs to a height of 5 m on the moon and gains 560 J of gravitational potential energy. What must be the gravitational field strength on the moon?

17 Kinetic energy 103. You are provided with an air track and vehicles, a light gate and timer and some elastic bands. Describe how you could use this apparatus to establish how kinetic energy depends on velocity. Include details of any measurements you would take and any additional measuring equipment needed Calculate the kinetic energy of the following: a) a 5 kg bowling ball moving at 4 m/s b) a 50 kg skier moving at 20 m/s c) a 0.02 kg bullet moving at 100 m/s a) How much kinetic energy does a 800 kg car have at a speed of 10 m/s? b) If it doubles its speed to 20 m/s, calculate its new kinetic energy? 106. A cyclist who is pedalling down a slope reaches a speed of 15 m/s. The cyclist and her cycle together have a mass of 80 kg. a) Calculate the total kinetic energy. b) Name two sources of this kinetic energy Calculate an approximate value for the kinetic energy of an Olympic 100 m sprinter as he crosses the line (time for race is about 10 s) What is the speed of a stone of mass 2 kg if it has 36 J of kinetic energy? 109. A motor cyclist and his bike have a total mass of 360 kg and kinetic energy of J. What is his speed? 110. The apple in question 101 is dropped from the top of the Eiffel Tower. a) How much kinetic energy would it have just before hitting the ground? b) What will be its velocity as it hits the ground? 111. A car of mass 1000 kg is travelling at 20 m/s. a) How much kinetic energy does it have? b) If the maximum braking force is 5 kn, what will be the minimum braking distance? c) If the driver has a reaction time of 0.7 s, how far will the car travel during this thinking time? d) What will the total stopping distance be?

18 NUMERICAL ANSWERS Kinematics 1. 8 m/s m/s m/s m/s 2 4. a) 10 km/h m/s 2 b) 2.8 m/s m/s m m/s m s s ( 2 h 13 min ) s min s min 35. a) Micra 11. a) 24.3 m/s b) Porsche b) 28.3 m/s c) i) 20.7 s ii) 15.1s m/s 36. b) 1.5 m/s a) 0.75 m/s c) 75 m b) 1.5 m/s d) 525 m 17. a) 2 km west 37. a) s b) 3.6 km b) i) 1m/s 2 ii) 2 m/s a) 1.5 m/s c) 225 m b) 0.83 m/s west d) 2475 m 19. a) 400 m e) 23.6 m/s b) a) 16 m/s c) 8.3 m/s b) 288 m d) 0 c) 12 m/s 20. a) 800 m 40. a) 0.3 m/s 2 b) 0 b) accelerating 200 m c) 7 m/s constant velocity 160 m d) a) 30 km north b) 50 km c) 30 km/h north d) 50 km/h 22. a) 140 km b) 100 km at (053) c) 70 km/h d) 50 km/h at (053) m/s m/s m/ s 2

19 Dynamics N 72. a) 1200 N N b) 2880 N kg m/s 44. a) N 74. a) 8 m/s b) N b) 30 m/s c) N 75. a) 12 m N b) 20 m/s kg Mars 76. a) 1200 m N b) 80 m/s 51. a) 2000 N c) 1200 m b) 2000 N 77. b) i) horizontal = 75 m 52. b) 850 N ii) vertical = 125 m c) N 56. a) 800 N to left b) 100 N down c) N to right 57. a) 13 N at (157) b) 15.8 N at (198) c) 30 N at (143) d) 12.8 N at (309) N m/s kg N N m/s m/s m/s m/s kg N 71. a) 650 N b) 65 N c) 715 N

20 Energy MJ m N m kj J W W 91. a) 400 W b) 400 W kw W 95. a) N b) 36 kw s 97. a) 8 kw kj 99. a)750 J b)750 J m N/kg 104. a) 40 J b) 10 kj c) 100 J 105. a) 40 kj b)160 kj 106. a) 9 kj m/s 110. a) 300 J b) 77m/s 111. a) 200 kj b) 40 m c) 14 m d) 54 m

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