3.00 m. 8. At La Ronde, the free-fall ride called the Orbit" causes a 60.0 kg person to accelerate at a rate of 9.81 m/s 2 down.

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1 Physics Prees: Torque 1. Newon s 2 nd Law 2. Kinemaics (Free fall, graphs, and combined wih F R = ma) Pracice Quesions/Problems 1. Wha is Newon s 2 nd Law? Name and explain i. 2. Prove ha acceleraion for an ideal inclined plane is a = gsina. 3. Prove ha acceleraion for a real inclined plane is a = g(sina kcosa). 4. Wha is mean by A car ravels a 5 km/h? 5. Wha is mean by An apple falls a acceleraes a a rae of 9.8 m/s 2? 6. In auomobile racing, here is a consan effor o increase he performance of he cars, paricularly he acceleraion. An engineer proposes he four following suggesions. Which one of hese would, in fac, REDUCE acceleraion? [B] A) Increase he propulsion force of he moor. B) Increase he weigh of he car. C) Decrease he mass of he car. D) Reduce he fricion forces. 7. A 2. kg uniform plank has four uniform concree blocks placed on i, as illusraed. If each block has a mass of 1. kg and a widh of 24. cm, where is he fulcrum locaed from he righ end? 24. cm x? 3. m 8. A La Ronde, he free-fall ride called he Orbi" causes a 6. kg person o accelerae a a rae of 9.81 m/s 2 down. a) Had he person been siing on a balance, wha would he scale reading be in newons? [] b) Wha sensaion does his siuaion accoun for? [A sense of weighlessness.] 9. A 1. kg mass is suspended from each side of a pulley. An exra.5 kg mass is added o he lef side. Wha is he acceleraion of he se of masses on his pulley? [2. m/s 2 ] Fricionless pulley, wih negligible mass Cord, wih negligible mass 1. kg 1. kg.5 kg

2 1. A 6. kg box is placed on a weighing scale in an elevaor ha is moving upwards. The scale shows a force of 7. N is acing on i. Wha is he acceleraion of he elevaor? [1.87m/s 2 ] 11. A 1 kg car driving a a speed of 1 m/s along a horizonal, sraigh highway is acceleraed by a 5 N force parallel o he road. Neglecing he force of fricion, wha is he acceleraion of he car? [5 m/s] 12. A 3. kg mass is suspended from a block placed on a able. The block hen experiences an acceleraion of 5. m/s 2. Wha is he mass of he block? (Neglec fricion) [2.9 kg] a = 5. m/s 2 3. kg 13. A newspaper delivery boy uses a small wagon wih a mass of 3. kg o pull his newspapers wihou fricion. Using he handle, he pulls he wagon wih a force of 5. N a an angle of inclinaion of 4. wih respec o he horizonal. 5. N 44. o Wha is he acceleraion of he wagon? [1.3 m/s 2 ] 14. A 1. kg box is pulled across a level floor, where he coefficien of fricion is.35. Wha horizonal force is required for an acceleraion of 2. m/s 2? [54.3 N] 15. The incline is 1.2 m long and he car begins a an elevaion of 6. cm above he able. Ignoring fricional forces, a wha speed is he car going when i reaches he boom? [3.5 m/s] 1.2 m 6 cm A car wih a mass of 1. x 1 3 kg and moving a a speed of 3. m/s comes o res over a disance of 1. x 1 2 meres. Wha is he force of fricion (acing on he wheels of he car) which causes he car o sop? [45 N] 17. A package falls from an airplane wih an iniial velociy of 5 m/s a an aliude of 5 m. Wha disance does i fall during he hird second? [3 m]

3 18. The following graph shows he variaion of he velociy of a rain as a funcion of ime. velociy i f ime Wha does he area of he shaded par of he graph represen? A) The acceleraion of he rain beween imes i and f. B) The average velociy of he rain beween imes i and f. C) The change of velociy of he rain beween imes i and f. D) The disance covered by he rain beween imes i and f. 19. The following graph shows he change in he velociy of a rain, moving in a sraigh line pah, as a funcion of ime. V Which one of he following graphs shows he change of acceleraion of he rain as a funcion of ime? A) a C) a B) a D) a 2. The following graph shows he posiion as a funcion of ime of a cyclis going in a sraigh-line pah. s (m) (s) Wha is he velociy of he cyclis a 25 seconds? [- 5 m/s]

4 21. A car is driving in a sraigh-line pah. Is change of posiion as a funcion of ime is given by he following graph. s (m) (s) Wha is he displacemen of he car from o 13 seconds? [24 m] 22. An auomobile is being driven a a consan velociy on a sraigh road. The car slows down when i comes o a village, comes o a sop a an inersecion, hen ses off again and acceleraes a a consan rae leaving he village. Show wha has occurred by consrucing he velociy-ime graph for he auomobile. 23. A ski lif moves up and down along a hill according o he following V- graph. Unforunaely, i salls on he way down a = 2 s. Top A his poin, he rescue eam mus decide wheher he skiers are closer o he op or he boom of he hill. Ski Lif Boom Using he V- graph, deermine wheher he ski lif is closer o he op or o he boom of he hill and by how much. [closer o boom by 4 m] Ski Lif Velociy Graph Velociy (m/s)

5 24. Which of he following graphs could be associaed wih a body in free-fall? 25. Ali is paricipaing in he Tour de l Île bicycle marahon held each year on he island of Monreal. The following velociy versus ime graph represens Ali s course over a period of 18 seconds. Velociy (m/s) Velociy-ime Graph of Ali s Bicycle Race From he graph deermine he following: 1. Ali s acceleraion a 4 seconds. [] 2. Ali s acceleraion a 12 seconds. [-.75 m/s] 3. Ali s displacemen during he period beween 8 seconds and 14 seconds ino he ride. [3 m] 26. A car and a ruck leave a raffic ligh a he same ime, ravelling in he same direcion. The graphs below illusrae heir moions. Speed as a Funcion of Time Car 15 Velociy (m/s) 1 Posiion (m) Posiion as a Funcion of Time Truck How many meres apar are he wo vehicles afer 3 seconds? [25 m]

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