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Engineering Worksheet: Part 2 Test

Engineering lesson 16: Part 2 test: forces and machines · Set 853 · 40 questions
TalentJR

Engineer's tip (Find the topic, use the idea): Find the topic: force, friction, machine, lever class, balance, pulley or work. Use that lesson’s rule — what is in the middle, load × distance = effort × distance, effort = load ÷ ropes, work = force × distance. Write the calculation before you answer.

NameDateTime takenScore ___ / 40
  1. 1.🪝 A load of 680 N hangs from a pulley system in which 4 rope sections hold up the load. What effort is needed, in newtons? (ideal pulleys)
  2. 2.🪝 Fixed or movable pulley: which one only changes direction? (a) a fixed pulley (b) a movable pulley
  3. 3.True or false: a bottle opener is a pulley. (a) True (b) False
  4. 4.True or false: a pair of scissors is a class 1 lever (fulcrum in the middle). (a) False (b) True
  5. 5.⚖️ A lever bar balances. The load is ? N at 10 cm from the fulcrum. The effort is 40 N at 60 cm from the fulcrum on the other side. What is the missing force in newtons?
  6. 6.💪 Two children push a box to the right, one with 35 N and the other with 30 N. What is the net (total) force on the box, in newtons?
  7. 7.⚖️ A seesaw balances. Ravi (440 N) sits ? m from the pivot on one side; Arjun (220 N) sits 4 m from the pivot on the other side. What is the missing distance in metres?
  8. 8.Which of these is caused by gravity? (a) lifting a school bag (b) a rolling ball slows (c) an apple falls down (d) rubbing hands warms them
  9. 9.⚖️ Turning effect = force × … (a) time taken (b) mass of fulcrum (c) distance from fulcrum (d) colour of bar
  10. 10.True or false: a box pushed on carpet gives less friction. (a) False (b) True
  11. 11.🏋️ A smooth ramp is 5 m long and rises 1 m. What effort pushes a 1250 N box up it, in newtons? (ideal ramp, no friction)
  12. 12.⚖️ A lever bar balances. The load is 50 N at ? cm from the fulcrum. The effort is 50 N at 50 cm from the fulcrum on the other side. What is the missing distance in centimetres?
  13. 13.🪝 Fixed or movable pulley: which one is on a flagpole top? (a) a movable pulley (b) a fixed pulley
  14. 14.⚖️ A seesaw balances. Asha (? N) sits 1 m from the pivot on one side; Arjun (170 N) sits 1 m from the pivot on the other side. What is the missing weight in newtons?
  15. 15.🏋️ A smooth ramp is 12 m long and rises 3 m. What effort pushes a 1600 N box up it, in newtons? (ideal ramp, no friction)
  16. 16.💪 Is pulling up your socks a push or a pull? (a) a push (b) a pull
  17. 17.🛞 Friction acts … (a) against the motion (b) with the motion (c) only upwards (d) only on ice
  18. 18.🏋️ A machine lifts a load of 480 N when you push with 160 N. What is its mechanical advantage (MA)?
  19. 19.True or false: a movable pulley rises with the load. (a) False (b) True
  20. 20.🏋️ In which unit is work measured? (a) newton (N) (b) metre (m) (c) watt hour (d) joule (J)
  21. 21.True or false: oil on a squeaky hinge gives less friction. (a) False (b) True
  22. 22.True or false: a grippy rubber sole gives less friction. (a) True (b) False
  23. 23.⚖️ Along a straight bar, measured from the left end, the effort is at 70 cm, the fulcrum at 30 cm and the load at 10 cm. Which class of lever is it? (a) class 1 (b) class 3 (c) class 2
  24. 24.🪝 A well winch has a handle (wheel) of radius 14 cm turning an axle of radius 2 cm. What is its mechanical advantage (MA)?
  25. 25.Which of these is caused by gravity? (a) rubbing hands warms them (b) a magnet picks up pins (c) a thrown ball comes down (d) a rolling ball slows
  26. 26.⚖️ Going along a lever from one end to the other, the order is: fulcrum, load, effort. Which class of lever is it? (a) class 1 (b) class 3 (c) class 2
  27. 27.🏋️ A machine lifts a load of 260 N when you push with 130 N. What is its mechanical advantage (MA)?
  28. 28.🏋️ A force of 80 N pushes a cart 3 m along the floor. How much work is done, in joules?
  29. 29.🛞 Is friction helpful or a problem here: machine parts heating up? (a) a problem (b) helpful
  30. 30.🏋️ A force of 350 N did 2450 J of work. How many metres did the object move?
  31. 31.⚖️ Which class of lever is a crowbar? (a) class 3 (b) class 2 (c) class 1
  32. 32.⚖️ Along a straight bar, measured from the left end, the effort is at 30 cm, the fulcrum at 20 cm and the load at 60 cm. Which class of lever is it? (a) class 2 (b) class 3 (c) class 1
  33. 33.💪 Which force is at work: a thrown ball comes down? (a) friction (b) gravity (c) magnetic force (d) muscular force
  34. 34.🪝 A pulley system lifts a 1040 N load with an effort of 260 N. What is its mechanical advantage (MA)?
  35. 35.🏋️ A 15 kg box is lifted straight up by 3 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
  36. 36.🛞 More or less friction: a rough doormat? (a) more friction (b) less friction
  37. 37.💪 A box weighs 520 N. Taking 1 kg to weigh about 10 N, what is its mass in kilograms?
  38. 38.🛞 Is friction helpful or a problem here: striking a matchstick? (a) a problem (b) helpful
  39. 39.True or false: a water tap handle is a wheel and axle. (a) True (b) False
  40. 40.True or false: a rough doormat gives more friction. (a) True (b) False

Answer key

  1. 170
  2. a fixed pulley
  3. False
  4. True
  5. 240
  6. 65
  7. 2
  8. an apple falls down
  9. distance from fulcrum
  10. False
  11. 250
  12. 50
  13. a fixed pulley
  14. 170
  15. 400
  16. a pull
  17. against the motion
  18. 3
  19. True
  20. joule (J)
  21. True
  22. False
  23. class 1
  24. 7
  25. a thrown ball comes down
  26. class 2
  27. 2
  28. 240
  29. a problem
  30. 7
  31. class 1
  32. class 3
  33. gravity
  34. 4
  35. 450
  36. more friction
  37. 52
  38. helpful
  39. True
  40. True

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