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Engineering Worksheet: Part 2 Test

Engineering lesson 16: Part 2 test: forces and machines · Set 158 · 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.

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  1. 1.⚖️ Which class of lever is a fishing rod? (a) class 3 (b) class 1 (c) class 2
  2. 2.⚖️ Which class of lever is a wheelbarrow? (a) class 3 (b) class 1 (c) class 2
  3. 3.⚖️ Turning effect = force × … (a) distance from fulcrum (b) time taken (c) colour of bar (d) mass of fulcrum
  4. 4.💪 Is hitting a cricket ball a push or a pull? (a) a pull (b) a push
  5. 5.True or false: a playground slide is an inclined plane. (a) False (b) True
  6. 6.🪝 A well winch has a handle (wheel) of radius 10 cm turning an axle of radius 2 cm. What is its mechanical advantage (MA)?
  7. 7.💪 In which unit do we measure force? (a) second (s) (b) metre (m) (c) newton (N) (d) litre (L)
  8. 8.🏋️ A machine lifts a load of 420 N when you push with 140 N. What is its mechanical advantage (MA)?
  9. 9.⚖️ Along a straight bar, measured from the left end, the effort is at 50 cm, the fulcrum at 90 cm and the load at 10 cm. Which class of lever is it? (a) class 3 (b) class 1 (c) class 2
  10. 10.🪝 A bucket weighing 80 N is lifted with a single fixed pulley at the top of a well. What effort is needed, in newtons? (ideal pulley, no friction)
  11. 11.🔍 Which is the odd one out? (a) skating on ice (b) sand on a slippery path (c) powder on a carrom board (d) a smooth steel slide
  12. 12.🪝 A well winch has a handle (wheel) of radius 3 cm turning an axle of radius 1 cm. What is its mechanical advantage (MA)?
  13. 13.🪝 Fixed or movable pulley: which one only changes direction? (a) a movable pulley (b) a fixed pulley
  14. 14.🪝 More rope sections holding a load means … (a) less effort needed (b) more effort needed (c) no change (d) the load floats
  15. 15.True or false: a fixed pulley only changes direction. (a) True (b) False
  16. 16.⚙️ How many simple machines are there in the usual list? (a) 12 (b) 6 (c) 10 (d) 3
  17. 17.🪝 Fixed or movable pulley: which one is on a flagpole top? (a) a fixed pulley (b) a movable pulley
  18. 18.⚖️ A seesaw balances. Zoya (200 N) sits 1 m from the pivot on one side; Meena (? N) sits 2 m from the pivot on the other side. What is the missing weight in newtons?
  19. 19.🏋️ A 19 kg box is lifted straight up by 3 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
  20. 20.🏋️ Can a simple machine reduce the work done? (a) yes, always (b) only on Mondays (c) no, work stays the same (d) yes, by half
  21. 21.💪 Is pressing a doorbell a push or a pull? (a) a push (b) a pull
  22. 22.True or false: pulling up your socks is a push. (a) True (b) False
  23. 23.🛞 Is friction helpful or a problem here: a knot holding a rope? (a) a problem (b) helpful
  24. 24.⚖️ A seesaw balances. Arjun (760 N) sits ? m from the pivot on one side; Meena (760 N) sits 4 m from the pivot on the other side. What is the missing distance in metres?
  25. 25.🪝 A winch has a wheel of radius 16 cm and an axle of radius 2 cm. What effort on the wheel lifts a 240 N bucket on the axle, in newtons? (ideal)
  26. 26.⚖️ What is the pivot point of a lever called? (a) the axle (b) the load (c) the effort (d) the fulcrum
  27. 27.⚖️ A seesaw balances. Meena (? N) sits 4 m from the pivot on one side; Zoya (400 N) sits 1 m from the pivot on the other side. What is the missing weight in newtons?
  28. 28.True or false: a crowbar is a class 1 lever (fulcrum in the middle). (a) True (b) False
  29. 29.🏋️ Pushing a crate 4 m took 1600 J of work. What force was used, in newtons?
  30. 30.⚖️ A seesaw balances. Zoya (280 N) sits 4 m from the pivot on one side; Kabir (560 N) sits ? m from the pivot on the other side. What is the missing distance in metres?
  31. 31.💪 Two equal forces push on a box from opposite sides. They are … (a) doubled (b) balanced (c) unbalanced (d) gravity
  32. 32.🛞 Why are tyres made with deep treads? (a) to go slower (b) to save rubber (c) to look nice (d) to grip the road
  33. 33.💪 Which force is at work: an apple falls down? (a) gravity (b) muscular force (c) magnetic force (d) friction
  34. 34.🪝 What does a single fixed pulley change? (a) the direction of pull (b) gravity (c) the colour of rope (d) the size of the load
  35. 35.True or false: pulling up your socks is a pull. (a) True (b) False
  36. 36.💪 Is kicking a football a push or a pull? (a) a pull (b) a push
  37. 37.⚖️ A lever bar balances. The load is 100 N at 50 cm from the fulcrum. The effort is ? N at 100 cm from the fulcrum on the other side. What is the missing force in newtons?
  38. 38.True or false: closing a drawer is a pull. (a) True (b) False
  39. 39.⚖️ A lever bar balances. The load is 320 N at 30 cm from the fulcrum. The effort is ? N at 80 cm from the fulcrum on the other side. What is the missing force in newtons?
  40. 40.Which of these is caused by magnetic force? (a) a fridge magnet sticks (b) rubbing hands warms them (c) an apple falls down (d) rain falls to the ground

Answer key

  1. class 3
  2. class 2
  3. distance from fulcrum
  4. a push
  5. True
  6. 5
  7. newton (N)
  8. 3
  9. class 3
  10. 80
  11. sand on a slippery path
  12. 3
  13. a fixed pulley
  14. less effort needed
  15. True
  16. 6
  17. a fixed pulley
  18. 100
  19. 570
  20. no, work stays the same
  21. a push
  22. False
  23. helpful
  24. 4
  25. 30
  26. the fulcrum
  27. 100
  28. True
  29. 400
  30. 2
  31. balanced
  32. to grip the road
  33. gravity
  34. the direction of pull
  35. True
  36. a push
  37. 50
  38. False
  39. 120
  40. a fridge magnet sticks

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