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Engineering Worksheet: Part 2 Test

Engineering lesson 16: Part 2 test: forces and machines · Set 26 · 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 cart is pulled to the right with 25 N and to the left with 15 N. Which way does the net force act? (a) to the left (b) to the right (c) no net force
  2. 2.True or false: a fixed pulley halves the effort. (a) True (b) False
  3. 3.⚖️ Turning effect = force × … (a) mass of fulcrum (b) time taken (c) distance from fulcrum (d) colour of bar
  4. 4.🏋️ A smooth ramp is 5 m long and rises 1 m. What effort pushes a 3750 N box up it, in newtons? (ideal ramp, no friction)
  5. 5.💪 A force is a … (a) push or a pull (b) unit of time (c) kind of colour (d) type of sound
  6. 6.💪 In a tug of war, one team pulls left with 65 N and the other pulls right with 50 N. What is the size of the net force, in newtons?
  7. 7.🛞 More or less friction: a grippy rubber sole? (a) less friction (b) more friction
  8. 8.True or false: a chisel is a wedge. (a) False (b) True
  9. 9.🏋️ A smooth ramp is 10 m long and rises 2 m. What effort pushes a 3000 N box up it, in newtons? (ideal ramp, no friction)
  10. 10.⚖️ A lever bar balances. The load is 400 N at 10 cm from the fulcrum. The effort is ? N at 50 cm from the fulcrum on the other side. What is the missing force in newtons?
  11. 11.🪝 A well winch has a handle (wheel) of radius 9 cm turning an axle of radius 3 cm. What is its mechanical advantage (MA)?
  12. 12.⚖️ Along a straight bar, measured from the left end, the effort is at 20 cm, the fulcrum at 30 cm and the load at 40 cm. Which class of lever is it? (a) class 1 (b) class 2 (c) class 3
  13. 13.💪 Is plucking a mango a push or a pull? (a) a push (b) a pull
  14. 14.True or false: pushing a swing is a pull. (a) False (b) True
  15. 15.🏋️ Pushing a crate 10 m took 4600 J of work. What force was used, in newtons?
  16. 16.🏋️ A machine lifts a load of 120 N when you push with 60 N. What is its mechanical advantage (MA)?
  17. 17.⚖️ A seesaw balances. Asha (420 N) sits 3 m from the pivot on one side; Arjun (420 N) sits ? m from the pivot on the other side. What is the missing distance in metres?
  18. 18.🏋️ A force of 150 N pushes a cart 10 m along the floor. How much work is done, in joules?
  19. 19.🪝 A well winch has a handle (wheel) of radius 12 cm turning an axle of radius 4 cm. What is its mechanical advantage (MA)?
  20. 20.⚙️ Which simple machine is a screw jack? (a) wheel and axle (b) pulley (c) lever (d) screw
  21. 21.True or false: a rough doormat gives less friction. (a) True (b) False
  22. 22.⚖️ A lever bar balances. The load is 600 N at ? cm from the fulcrum. The effort is 300 N at 60 cm from the fulcrum on the other side. What is the missing distance in centimetres?
  23. 23.True or false: a window blind cord is a screw. (a) False (b) True
  24. 24.🏋️ A smooth ramp is 12 m long and rises 2 m. What effort pushes a 600 N box up it, in newtons? (ideal ramp, no friction)
  25. 25.💪 In a tug of war, one team pulls right with 25 N and the other pulls left with 20 N. What is the size of the net force, in newtons?
  26. 26.💪 A bag has a mass of 10 kg. Taking 1 kg to weigh about 10 N, what is its weight in newtons?
  27. 27.💪 A cart is pulled to the right with 95 N and to the left with 110 N. Which way does the net force act? (a) to the left (b) no net force (c) to the right
  28. 28.True or false: pressing a doorbell is a pull. (a) True (b) False
  29. 29.⚖️ Along a straight bar, measured from the left end, the effort is at 50 cm, the fulcrum at 20 cm and the load at 60 cm. Which class of lever is it? (a) class 2 (b) class 1 (c) class 3
  30. 30.🪝 A pulley system has 3 rope sections holding up the load. To lift the load by 5 m, how many metres of rope must you pull?
  31. 31.True or false: a nutcracker is a lever. (a) False (b) True
  32. 32.⚖️ A seesaw balances. Kabir (280 N) sits 1 m from the pivot on one side; Meena (140 N) sits ? m from the pivot on the other side. What is the missing distance in metres?
  33. 33.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 3 N, a wooden plank 7 N, a carpet 10 N, sandpaper 13 N. Which surface gave the least friction? (a) a carpet (b) sandpaper (c) a wooden plank (d) a glass sheet
  34. 34.⚖️ Which class of lever is a pair of pliers? (a) class 3 (b) class 2 (c) class 1
  35. 35.True or false: the tip of a nail is a wedge. (a) True (b) False
  36. 36.True or false: a lemon squeezer is a class 2 lever (load in the middle). (a) True (b) False
  37. 37.🛞 Friction acts … (a) only on ice (b) with the motion (c) against the motion (d) only upwards
  38. 38.🔍 Which is the odd one out? (a) a wheel on ball bearings (b) a box pushed on carpet (c) a grippy rubber sole (d) chalk on a gym bar
  39. 39.True or false: a fishing rod is a class 3 lever (effort in the middle). (a) False (b) True
  40. 40.🛞 More or less friction: chalk on a gym bar? (a) less friction (b) more friction

Answer key

  1. to the right
  2. False
  3. distance from fulcrum
  4. 750
  5. push or a pull
  6. 15
  7. more friction
  8. True
  9. 600
  10. 80
  11. 3
  12. class 1
  13. a pull
  14. False
  15. 460
  16. 2
  17. 3
  18. 1500
  19. 3
  20. screw
  21. False
  22. 30
  23. False
  24. 100
  25. 5
  26. 100
  27. to the left
  28. False
  29. class 3
  30. 15
  31. True
  32. 2
  33. a glass sheet
  34. class 1
  35. True
  36. True
  37. against the motion
  38. a wheel on ball bearings
  39. True
  40. more friction

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