Engineering Worksheet: Part 2 Test

Engineering lesson 16: Part 2 test: forces and machines · Set 950 · 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.True or false: a bottle opener is a class 3 lever (effort in the middle). (a) False (b) True
2. 2.⚖️ What is the pivot point of a lever called? (a) the effort (b) the axle (c) the fulcrum (d) the load
3. 3.⚖️ Turning effect = force × … (a) mass of fulcrum (b) colour of bar (c) time taken (d) distance from fulcrum
4. 4.⚖️ Which class of lever is a crowbar? (a) class 3 (b) class 2 (c) class 1
5. 5.⚙️ Which simple machine is a truck loading ramp? (a) inclined plane (b) pulley (c) lever (d) wedge
6. 6.🛞 More or less friction: sand on a slippery path? (a) less friction (b) more friction
7. 7.True or false: plucking a mango is a pull. (a) False (b) True
8. 8.⚖️ A lever bar balances. The load is 240 N at 20 cm from the fulcrum. The effort is 120 N at ? cm from the fulcrum on the other side. What is the missing distance in centimetres?
9. 9.⚖️ Going along a lever from one end to the other, the order is: load, fulcrum, effort. Which class of lever is it? (a) class 2 (b) class 3 (c) class 1
10. 10.🛞 More or less friction: a grippy rubber sole? (a) less friction (b) more friction
11. 11.⚖️ Along a straight bar, measured from the left end, the effort is at 70 cm, the fulcrum at 30 cm and the load at 60 cm. Which class of lever is it? (a) class 1 (b) class 2 (c) class 3
12. 12.⚖️ A lever bar balances. The load is 180 N at ? cm from the fulcrum. The effort is 270 N at 20 cm from the fulcrum on the other side. What is the missing distance in centimetres?
13. 13.⚖️ Which class of lever is a lemon squeezer? (a) class 2 (b) class 3 (c) class 1
14. 14.🪝 Fixed or movable pulley: which one stays in one place? (a) a fixed pulley (b) a movable pulley
15. 15.🔍 Which is the odd one out? (a) a rough doormat (b) a wheel on ball bearings (c) powder on a carrom board (d) a smooth steel slide
16. 16.⚖️ A seesaw balances. Arjun (150 N) sits 2 m from the pivot on one side; Meena (? N) sits 1 m from the pivot on the other side. What is the missing weight in newtons?
17. 17.🏋️ Work is done when a force moves something … (a) very slowly (b) without moving it (c) through a distance (d) only upwards
18. 18.⚖️ A lever balances when … (a) both weights are equal (b) turning effects match (c) the fulcrum moves (d) the bar is short
19. 19.⚖️ A seesaw balances. Asha (340 N) sits 3 m from the pivot on one side; Arjun (? N) sits 2 m from the pivot on the other side. What is the missing weight in newtons?
20. 20.🏋️ A machine lifts a load of 950 N when you push with 190 N. What is its mechanical advantage (MA)?
21. 21.🏋️ Pushing a crate 9 m took 3600 J of work. What force was used, in newtons?
22. 22.⚖️ To lift a heavy rock with a crowbar more easily, push … (a) on the rock (b) on the fulcrum (c) far from the fulcrum (d) near the fulcrum
23. 23.🪝 Fixed or movable pulley: which one makes you pull 2× rope? (a) a fixed pulley (b) a movable pulley
24. 24.⚖️ Along a straight bar, measured from the left end, the effort is at 10 cm, the fulcrum at 40 cm and the load at 30 cm. Which class of lever is it? (a) class 1 (b) class 3 (c) class 2
25. 25.🏋️ A longer ramp to the same height needs … (a) less effort (b) more effort (c) the same effort (d) no effort
26. 26.💪 Which force is at work: a thrown ball comes down? (a) friction (b) gravity (c) muscular force (d) magnetic force
27. 27.🪝 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
28. 28.🏋️ A machine lifts a load of 600 N when you push with 100 N. What is its mechanical advantage (MA)?
29. 29.🏋️ A 5 kg box is lifted straight up by 5 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
30. 30.True or false: a movable pulley makes you pull 2× rope. (a) False (b) True
31. 31.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 4 N, a glass sheet 6 N, a wooden plank 9 N, a carpet 11 N. Which surface gave the least friction? (a) a glass sheet (b) a carpet (c) ice (d) a wooden plank
32. 32.⚙️ 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
33. 33.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 7 N, sandpaper 11 N, ice 4 N, a glass sheet 5 N. Which surface gave the least friction? (a) ice (b) a carpet (c) sandpaper (d) a glass sheet
34. 34.⚖️ A seesaw balances. Ravi (450 N) sits ? m from the pivot on one side; Kabir (450 N) sits 3 m from the pivot on the other side. What is the missing distance in metres?
35. 35.💪 Is drawing up a well bucket a push or a pull? (a) a pull (b) a push
36. 36.🪝 A pulley system lifts an 80 N load with an effort of 40 N. What is its mechanical advantage (MA)?
37. 37.True or false: a fixed pulley makes you pull 2× rope. (a) True (b) False
38. 38.💪 Two equal forces push on a box from opposite sides. They are … (a) gravity (b) balanced (c) unbalanced (d) doubled
39. 39.⚖️ Which class of lever is a pair of tweezers? (a) class 1 (b) class 2 (c) class 3
40. 40.True or false: a nutcracker is a wheel and axle. (a) False (b) True

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