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Engineering Worksheet: Part 2 Test

Engineering lesson 16: Part 2 test: forces and machines · Set 230 · 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.💪 Two children push a box to the right, one with 100 N and the other with 90 N. What is the net (total) force on the box, in newtons?
  2. 2.🛞 Which surface gives the MOST friction to a sliding block? (a) glass (b) ice (c) sandpaper (d) polished marble
  3. 3.⚖️ Along a straight bar, measured from the left end, the effort is at 30 cm, the fulcrum at 40 cm and the load at 0 cm. Which class of lever is it? (a) class 3 (b) class 1 (c) class 2
  4. 4.Which of these is a lever? (a) a crane hook block (b) a crowbar (c) a road up a hill (d) a screw jack
  5. 5.🪝 A winch has a wheel of radius 10 cm and an axle of radius 5 cm. What effort on the wheel lifts a 380 N bucket on the axle, in newtons? (ideal)
  6. 6.🏋️ A machine lifts a load of 600 N when you push with 120 N. What is its mechanical advantage (MA)?
  7. 7.💪 Which force is at work: a compass needle turns? (a) gravity (b) muscular force (c) friction (d) magnetic force
  8. 8.True or false: a crowbar is a class 1 lever (fulcrum in the middle). (a) False (b) True
  9. 9.True or false: a seesaw is a class 2 lever (load in the middle). (a) False (b) True
  10. 10.⚙️ A wedge is … (a) a bar on a pivot (b) two ramps back to back (c) a wheel on a rod (d) a rope on a wheel
  11. 11.⚖️ A seesaw balances. Kabir (560 N) sits ? m from the pivot on one side; Ravi (280 N) sits 4 m from the pivot on the other side. What is the missing distance in metres?
  12. 12.🏋️ A smooth ramp is 4 m long and rises 2 m. What effort pushes a 400 N box up it, in newtons? (ideal ramp, no friction)
  13. 13.🪝 A winch has a wheel of radius 10 cm and an axle of radius 2 cm. What effort on the wheel lifts a 950 N bucket on the axle, in newtons? (ideal)
  14. 14.🪝 Fixed or movable pulley: which one only changes direction? (a) a fixed pulley (b) a movable pulley
  15. 15.🛞 Why are tyres made with deep treads? (a) to go slower (b) to grip the road (c) to save rubber (d) to look nice
  16. 16.💪 A box weighs 420 N. Taking 1 kg to weigh about 10 N, what is its mass in kilograms?
  17. 17.💪 Two children push a box to the right, one with 45 N and the other with 90 N. What is the net (total) force on the box, in newtons?
  18. 18.True or false: a truck loading ramp is a wheel and axle. (a) True (b) False
  19. 19.🏋️ In which unit is work measured? (a) metre (m) (b) newton (N) (c) watt hour (d) joule (J)
  20. 20.⚖️ Which class of lever is a pair of kitchen tongs? (a) class 2 (b) class 1 (c) class 3
  21. 21.⚖️ Which class of lever is a pair of scissors? (a) class 1 (b) class 3 (c) class 2
  22. 22.💪 Which force is at work: rubbing hands warms them? (a) magnetic force (b) friction (c) muscular force (d) gravity
  23. 23.🔍 Which is the odd one out? (a) a wheelchair ramp (b) a road up a hill (c) a truck loading ramp (d) a jar lid
  24. 24.True or false: a fixed pulley needs effort = load. (a) True (b) False
  25. 25.🏋️ A machine lifts a load of 360 N when you push with 180 N. What is its mechanical advantage (MA)?
  26. 26.⚙️ Most simple machines make work easier by letting us … (a) make new energy (b) switch off gravity (c) use a smaller force (d) stop all friction
  27. 27.🪝 Fixed or movable pulley: which one is on a flagpole top? (a) a movable pulley (b) a fixed pulley
  28. 28.🏋️ Pushing a crate 8 m took 3200 J of work. What force was used, in newtons?
  29. 29.💪 Is hitting a cricket ball a push or a pull? (a) a pull (b) a push
  30. 30.💪 A box weighs 570 N. Taking 1 kg to weigh about 10 N, what is its mass in kilograms?
  31. 31.💪 A bag has a mass of 14 kg. Taking 1 kg to weigh about 10 N, what is its weight in newtons?
  32. 32.⚖️ A seesaw balances. Arjun (? N) sits 4 m from the pivot on one side; Kabir (480 N) sits 1 m from the pivot on the other side. What is the missing weight in newtons?
  33. 33.True or false: oil on a squeaky hinge gives more friction. (a) True (b) False
  34. 34.⚖️ A lever bar balances. The load is 20 N at 30 cm from the fulcrum. The effort is ? N at 20 cm from the fulcrum on the other side. What is the missing force in newtons?
  35. 35.⚖️ A seesaw balances. Meena (? N) sits 2 m from the pivot on one side; Ravi (260 N) sits 1 m from the pivot on the other side. What is the missing weight in newtons?
  36. 36.⚖️ On a seesaw, a heavier child should sit … (a) farther from the pivot (b) anywhere (c) on the pivot (d) closer to the pivot
  37. 37.⚖️ Turning effect = force × … (a) time taken (b) distance from fulcrum (c) colour of bar (d) mass of fulcrum
  38. 38.True or false: a pair of kitchen tongs is a class 3 lever (effort in the middle). (a) False (b) True
  39. 39.🏋️ Pushing a crate 3 m took 90 J of work. What force was used, in newtons?
  40. 40.🏋️ A smooth ramp is 2 m long and rises 1 m. What effort pushes a 1100 N box up it, in newtons? (ideal ramp, no friction)

Answer key

  1. 190
  2. sandpaper
  3. class 3
  4. a crowbar
  5. 190
  6. 5
  7. magnetic force
  8. True
  9. False
  10. two ramps back to back
  11. 2
  12. 200
  13. 190
  14. a fixed pulley
  15. to grip the road
  16. 42
  17. 135
  18. False
  19. joule (J)
  20. class 3
  21. class 1
  22. friction
  23. a jar lid
  24. True
  25. 2
  26. use a smaller force
  27. a fixed pulley
  28. 400
  29. a push
  30. 57
  31. 140
  32. 120
  33. False
  34. 30
  35. 130
  36. closer to the pivot
  37. distance from fulcrum
  38. True
  39. 30
  40. 550

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