Engineering Worksheet: Part 2 Test

Engineering lesson 16: Part 2 test: forces and machines · Set 807 · 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.⚖️ A lever bar balances. The load is ? N at 40 cm from the fulcrum. The effort is 80 N at 80 cm from the fulcrum on the other side. What is the missing force in newtons?
2. 2.💪 Which force is at work: brakes stop a bicycle? (a) muscular force (b) friction (c) magnetic force (d) gravity
3. 3.⚖️ A seesaw balances. Asha (? N) sits 4 m from the pivot on one side; Kabir (680 N) sits 1 m from the pivot on the other side. What is the missing weight in newtons?
4. 4.🏋️ Work is done when a force moves something … (a) only upwards (b) very slowly (c) through a distance (d) without moving it
5. 5.🛞 How can we reduce friction in a machine? (a) press parts harder (b) add sand (c) oil the moving parts (d) make parts rough
6. 6.⚖️ A seesaw balances. Ravi (190 N) sits 4 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?
7. 7.Which of these is a pulley? (a) a knife edge (b) a flagpole rope wheel (c) a claw hammer on a nail (d) a nutcracker
8. 8.🪝 A well winch has a handle (wheel) of radius 25 cm turning an axle of radius 5 cm. What is its mechanical advantage (MA)?
9. 9.⚙️ Which simple machine is a wood screw? (a) wheel and axle (b) pulley (c) screw (d) wedge
10. 10.💪 Which force is at work: pedalling a cycle? (a) magnetic force (b) muscular force (c) gravity (d) friction
11. 11.True or false: a rough doormat gives less friction. (a) False (b) True
12. 12.True or false: drawing up a well bucket is a pull. (a) False (b) True
13. 13.⚖️ Turning effect = force × … (a) colour of bar (b) mass of fulcrum (c) time taken (d) distance from fulcrum
14. 14.🪝 A pulley system has 3 rope sections holding up the load. To lift the load by 8 m, how many metres of rope must you pull?
15. 15.⚙️ Which simple machine is a round doorknob? (a) inclined plane (b) wheel and axle (c) screw (d) wedge
16. 16.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 7 N, a carpet 8 N, sandpaper 9 N, ice 3 N. Which surface gave the most friction? (a) a carpet (b) a glass sheet (c) ice (d) sandpaper
17. 17.⚖️ A lever balances when … (a) the fulcrum moves (b) both weights are equal (c) turning effects match (d) the bar is short
18. 18.⚖️ A seesaw balances. Kabir (520 N) sits 1 m from the pivot on one side; Arjun (130 N) sits ? m from the pivot on the other side. What is the missing distance in metres?
19. 19.⚖️ Along a straight bar, measured from the left end, the effort is at 40 cm, the fulcrum at 30 cm and the load at 80 cm. Which class of lever is it? (a) class 2 (b) class 3 (c) class 1
20. 20.🏋️ Pushing a crate 8 m took 2720 J of work. What force was used, in newtons?
21. 21.True or false: a chisel is a pulley. (a) True (b) False
22. 22.⚖️ Which class of lever is a bottle opener? (a) class 1 (b) class 3 (c) class 2
23. 23.🏋️ A 15 kg box is lifted straight up by 4 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
24. 24.🪝 A pulley system has 4 rope sections holding up the load. To lift the load by 5 m, how many metres of rope must you pull?
25. 25.Which of these is a lever? (a) the tip of a nail (b) a window blind cord (c) a bottle opener (d) a crane hook block
26. 26.🪝 A winch has a wheel of radius 9 cm and an axle of radius 3 cm. What effort on the wheel lifts a 600 N bucket on the axle, in newtons? (ideal)
27. 27.Which of these is a lever? (a) a steering wheel (b) a wheelchair ramp (c) a seesaw (d) a crane hook block
28. 28.🪝 A well winch has a handle (wheel) of radius 2 cm turning an axle of radius 1 cm. What is its mechanical advantage (MA)?
29. 29.⚖️ Going along a lever from one end to the other, the order is: load, effort, fulcrum. Which class of lever is it? (a) class 1 (b) class 2 (c) class 3
30. 30.🪝 More rope sections holding a load means … (a) no change (b) the load floats (c) less effort needed (d) more effort needed
31. 31.🔍 Which is the odd one out? (a) a grippy rubber sole (b) skating on ice (c) a box pushed on carpet (d) a tyre with deep treads
32. 32.⚖️ A seesaw balances. Meena (? N) sits 3 m from the pivot on one side; Arjun (390 N) sits 3 m from the pivot on the other side. What is the missing weight in newtons?
33. 33.🛞 Is friction helpful or a problem here: striking a matchstick? (a) a problem (b) helpful
34. 34.🏋️ In which unit is work measured? (a) metre (m) (b) joule (J) (c) watt hour (d) newton (N)
35. 35.⚖️ Along a straight bar, measured from the left end, the effort is at 60 cm, the fulcrum at 30 cm and the load at 0 cm. Which class of lever is it? (a) class 2 (b) class 3 (c) class 1
36. 36.⚖️ A seesaw balances. Kabir (540 N) sits 3 m from the pivot on one side; Meena (? N) sits 3 m from the pivot on the other side. What is the missing weight in newtons?
37. 37.⚖️ Which class of lever is a pair of tweezers? (a) class 3 (b) class 1 (c) class 2
38. 38.True or false: a fixed pulley makes you pull 2× rope. (a) True (b) False
39. 39.⚖️ Which class of lever is a pair of scissors? (a) class 2 (b) class 1 (c) class 3
40. 40.🛞 More or less friction: a wet tiled floor? (a) less friction (b) more friction

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