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Engineering Worksheet: Part 2 Test

Engineering lesson 16: Part 2 test: forces and machines · Set 907 · 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.🛞 Is friction helpful or a problem here: dragging a heavy box? (a) helpful (b) a problem
  2. 2.True or false: a fixed pulley rises with the load. (a) True (b) False
  3. 3.⚙️ Which simple machine is a wood screw? (a) inclined plane (b) wedge (c) screw (d) pulley
  4. 4.⚖️ On a seesaw, a heavier child should sit … (a) on the pivot (b) farther from the pivot (c) anywhere (d) closer to the pivot
  5. 5.⚖️ A seesaw balances. Ravi (? N) sits 3 m from the pivot on one side; Asha (420 N) sits 2 m from the pivot on the other side. What is the missing weight in newtons?
  6. 6.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 3 N, a glass sheet 4 N, a wooden plank 7 N, a carpet 10 N. Which surface gave the most friction? (a) a wooden plank (b) a glass sheet (c) ice (d) a carpet
  7. 7.🏋️ Pushing a crate 9 m took 3240 J of work. What force was used, in newtons?
  8. 8.⚖️ Which class of lever is a broom when sweeping? (a) class 2 (b) class 1 (c) class 3
  9. 9.🏋️ A smooth ramp is 8 m long and rises 2 m. What effort pushes a 1400 N box up it, in newtons? (ideal ramp, no friction)
  10. 10.💪 Is pushing a trolley a push or a pull? (a) a pull (b) a push
  11. 11.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 1 N, a wooden plank 5 N, a carpet 9 N, sandpaper 10 N. How many newtons more were needed on sandpaper than on ice?
  12. 12.🏋️ A smooth ramp is 2 m long and rises 1 m. What effort pushes a 300 N box up it, in newtons? (ideal ramp, no friction)
  13. 13.🏋️ A force of 180 N pushes a cart 1 m along the floor. How much work is done, in joules?
  14. 14.⚖️ In a class 3 lever, what is in the middle? (a) the fulcrum (b) the pulley (c) the effort (d) the load
  15. 15.💪 In a tug of war, one team pulls left with 60 N and the other pulls right with 15 N. What is the size of the net force, in newtons?
  16. 16.💪 In which unit do we measure force? (a) newton (N) (b) metre (m) (c) litre (L) (d) second (s)
  17. 17.🪝 Fixed or movable pulley: which one halves the effort? (a) a movable pulley (b) a fixed pulley
  18. 18.🪝 A winch has a wheel of radius 14 cm and an axle of radius 2 cm. What effort on the wheel lifts a 280 N bucket on the axle, in newtons? (ideal)
  19. 19.🏋️ A machine lifts a load of 60 N when you push with 30 N. What is its mechanical advantage (MA)?
  20. 20.🪝 What does a single fixed pulley change? (a) gravity (b) the colour of rope (c) the size of the load (d) the direction of pull
  21. 21.⚙️ A wedge is … (a) a bar on a pivot (b) a rope on a wheel (c) two ramps back to back (d) a wheel on a rod
  22. 22.⚖️ A seesaw balances. Asha (? N) sits 1 m from the pivot on one side; Ravi (160 N) sits 1 m from the pivot on the other side. What is the missing weight in newtons?
  23. 23.⚖️ Which class of lever is a lemon squeezer? (a) class 1 (b) class 2 (c) class 3
  24. 24.💪 Which force is at work: an apple falls down? (a) gravity (b) friction (c) muscular force (d) magnetic force
  25. 25.🔍 Which is the odd one out? (a) a box pushed on carpet (b) a grippy rubber sole (c) oil on a squeaky hinge (d) a rough doormat
  26. 26.🏋️ A force of 480 N pushes a cart 3 m along the floor. How much work is done, in joules?
  27. 27.⚙️ How many simple machines are there in the usual list? (a) 10 (b) 3 (c) 6 (d) 12
  28. 28.⚙️ Most simple machines make work easier by letting us … (a) stop all friction (b) use a smaller force (c) switch off gravity (d) make new energy
  29. 29.⚖️ A lever balances when … (a) turning effects match (b) both weights are equal (c) the fulcrum moves (d) the bar is short
  30. 30.True or false: a crowbar is a class 3 lever (effort in the middle). (a) True (b) False
  31. 31.💪 Is closing a drawer a push or a pull? (a) a push (b) a pull
  32. 32.🪝 A wheel and axle is a big wheel fixed to … (a) a flat ramp (b) a sharp wedge (c) a smaller rod (axle) (d) a loose rope
  33. 33.True or false: pulling a cart is a push. (a) True (b) False
  34. 34.True or false: a fixed pulley stays in one place. (a) True (b) False
  35. 35.🛞 Friction acts … (a) only upwards (b) against the motion (c) only on ice (d) with the motion
  36. 36.🏋️ A machine lifts a load of 1000 N when you push with 200 N. What is its mechanical advantage (MA)?
  37. 37.🏋️ A machine lifts a load of 40 N when you push with 20 N. What is its mechanical advantage (MA)?
  38. 38.⚖️ Along a straight bar, measured from the left end, the effort is at 70 cm, the fulcrum at 0 cm and the load at 40 cm. Which class of lever is it? (a) class 3 (b) class 1 (c) class 2
  39. 39.True or false: kicking a football is a push. (a) True (b) False
  40. 40.⚖️ Which class of lever is a pair of kitchen tongs? (a) class 2 (b) class 3 (c) class 1

Answer key

  1. a problem
  2. False
  3. screw
  4. closer to the pivot
  5. 280
  6. a carpet
  7. 360
  8. class 3
  9. 350
  10. a push
  11. 9
  12. 150
  13. 180
  14. the effort
  15. 45
  16. newton (N)
  17. a movable pulley
  18. 40
  19. 2
  20. the direction of pull
  21. two ramps back to back
  22. 160
  23. class 2
  24. gravity
  25. oil on a squeaky hinge
  26. 1440
  27. 6
  28. use a smaller force
  29. turning effects match
  30. False
  31. a push
  32. a smaller rod (axle)
  33. False
  34. True
  35. against the motion
  36. 5
  37. 2
  38. class 2
  39. True
  40. class 3

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