Engineering Worksheet: Part 2 Test

Engineering lesson 16: Part 2 test: forces and machines · Set 556 · 40 questions

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.

1. 1.💪 Two equal forces push on a box from opposite sides. They are … (a) unbalanced (b) gravity (c) doubled (d) balanced
2. 2.⚖️ A lever bar balances. The load is 90 N at 10 cm from the fulcrum. The effort is ? N at 30 cm from the fulcrum on the other side. What is the missing force in newtons?
3. 3.💪 In which unit do we measure force? (a) metre (m) (b) second (s) (c) litre (L) (d) newton (N)
4. 4.⚖️ A lever balances when … (a) turning effects match (b) the bar is short (c) both weights are equal (d) the fulcrum moves
5. 5.True or false: a box pushed on carpet gives less friction. (a) False (b) True
6. 6.⚖️ A lever bar balances. The load is ? N at 10 cm from the fulcrum. The effort is 90 N at 50 cm from the fulcrum on the other side. What is the missing force in newtons?
7. 7.🛞 Is friction helpful or a problem here: dragging a heavy box? (a) helpful (b) a problem
8. 8.💪 Is plucking a mango a push or a pull? (a) a push (b) a pull
9. 9.True or false: a jar lid is a screw. (a) False (b) True
10. 10.🪝 A well winch has a handle (wheel) of radius 24 cm turning an axle of radius 4 cm. What is its mechanical advantage (MA)?
11. 11.⚖️ A lever bar balances. The load is ? N at 20 cm from the fulcrum. The effort is 60 N at 80 cm from the fulcrum on the other side. What is the missing force in newtons?
12. 12.🛞 Why are tyres made with deep treads? (a) to go slower (b) to save rubber (c) to grip the road (d) to look nice
13. 13.🛞 Is friction helpful or a problem here: a knot holding a rope? (a) a problem (b) helpful
14. 14.⚙️ Which simple machine is a window blind cord? (a) wheel and axle (b) lever (c) pulley (d) inclined plane
15. 15.Which of these is caused by muscular force? (a) squeezing a lemon (b) a thrown ball comes down (c) shoes grip the floor (d) a rolling ball slows
16. 16.⚖️ A seesaw balances. Kabir (200 N) sits ? m from the pivot on one side; Asha (400 N) sits 2 m from the pivot on the other side. What is the missing distance in metres?
17. 17.💪 Is opening a drawer a push or a pull? (a) a push (b) a pull
18. 18.🔍 Which is the odd one out? (a) a bottle opener (b) a well winch handle (c) a water tap handle (d) a round doorknob
19. 19.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 4 N, a glass sheet 5 N, a wooden plank 8 N, sandpaper 9 N. How many newtons more were needed on sandpaper than on ice?
20. 20.True or false: opening a drawer is a push. (a) False (b) True
21. 21.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 2 N, a glass sheet 5 N, a wooden plank 9 N, a carpet 12 N. Which surface gave the most friction? (a) a carpet (b) a wooden plank (c) ice (d) a glass sheet
22. 22.⚙️ Which simple machine is a playground slide? (a) inclined plane (b) wedge (c) pulley (d) screw
23. 23.🔍 Which is the odd one out? (a) a round doorknob (b) a window blind cord (c) a well-bucket rope wheel (d) a flagpole rope wheel
24. 24.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 4 N, a carpet 6 N, sandpaper 10 N, ice 3 N. How many newtons more were needed on sandpaper than on ice?
25. 25.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 7 N, sandpaper 10 N, ice 3 N, a glass sheet 6 N. Which surface gave the least friction? (a) sandpaper (b) a wooden plank (c) ice (d) a glass sheet
26. 26.🛞 Is friction helpful or a problem here: writing with a pencil? (a) helpful (b) a problem
27. 27.🪝 A wheel and axle is a big wheel fixed to … (a) a loose rope (b) a sharp wedge (c) a smaller rod (axle) (d) a flat ramp
28. 28.🏋️ A 1 kg box is lifted straight up by 2 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
29. 29.True or false: drawing up a well bucket is a pull. (a) True (b) False
30. 30.🏋️ Can a simple machine reduce the work done? (a) only on Mondays (b) yes, by half (c) no, work stays the same (d) yes, always
31. 31.⚖️ A lever bar balances. The load is ? N at 10 cm from the fulcrum. The effort is 70 N at 20 cm from the fulcrum on the other side. What is the missing force in newtons?
32. 32.🪝 A bucket weighing 150 N is lifted with a single fixed pulley at the top of a well. What effort is needed, in newtons? (ideal pulley, no friction)
33. 33.⚖️ Along a straight bar, measured from the left end, the effort is at 70 cm, the fulcrum at 100 cm and the load at 30 cm. Which class of lever is it? (a) class 2 (b) class 1 (c) class 3
34. 34.⚖️ A seesaw balances. Meena (? N) sits 3 m from the pivot on one side; Arjun (420 N) sits 3 m from the pivot on the other side. What is the missing weight in newtons?
35. 35.⚖️ A seesaw balances. Ravi (260 N) sits 4 m from the pivot on one side; Zoya (? N) sits 2 m from the pivot on the other side. What is the missing weight in newtons?
36. 36.⚖️ A seesaw balances. Asha (? N) sits 4 m from the pivot on one side; Meena (640 N) sits 1 m from the pivot on the other side. What is the missing weight in newtons?
37. 37.⚖️ Going along a lever from one end to the other, the order is: effort, fulcrum, load. Which class of lever is it? (a) class 1 (b) class 2 (c) class 3
38. 38.⚖️ A seesaw balances. Asha (? N) sits 1 m from the pivot on one side; Meena (150 N) sits 4 m from the pivot on the other side. What is the missing weight in newtons?
39. 39.🏋️ Work is done when a force moves something … (a) only upwards (b) very slowly (c) through a distance (d) without moving it
40. 40.⚖️ A seesaw balances. Arjun (480 N) sits 1 m from the pivot on one side; Asha (160 N) sits ? m from the pivot on the other side. What is the missing distance in metres?

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