Engineering Worksheet: Part 2 Test

Engineering lesson 16: Part 2 test: forces and machines · Set 301 · 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.🪝 Fixed or movable pulley: which one halves the effort? (a) a movable pulley (b) a fixed pulley
2. 2.True or false: sand on a slippery path gives more friction. (a) True (b) False
3. 3.Which of these is an inclined plane? (a) a bottle cap (b) a bottle opener (c) a crane hook block (d) a truck loading ramp
4. 4.True or false: a steering wheel is an inclined plane. (a) True (b) False
5. 5.⚖️ A lever bar balances. The load is 180 N at ? cm from the fulcrum. The effort is 60 N at 90 cm from the fulcrum on the other side. What is the missing distance in centimetres?
6. 6.⚖️ A lever bar balances. The load is 180 N at 40 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?
7. 7.🏋️ A 9 kg box is lifted straight up by 3 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
8. 8.⚖️ A seesaw balances. Kabir (? N) sits 1 m from the pivot on one side; Zoya (140 N) sits 3 m from the pivot on the other side. What is the missing weight in newtons?
9. 9.⚖️ A seesaw balances. Arjun (? N) sits 1 m from the pivot on one side; Ravi (110 N) sits 4 m from the pivot on the other side. What is the missing weight in newtons?
10. 10.⚖️ Going along a lever from one end to the other, the order is: load, fulcrum, effort. Which class of lever is it? (a) class 3 (b) class 1 (c) class 2
11. 11.⚖️ Along a straight bar, measured from the left end, the effort is at 10 cm, the fulcrum at 20 cm and the load at 30 cm. Which class of lever is it? (a) class 3 (b) class 2 (c) class 1
12. 12.🛞 Friction acts … (a) against the motion (b) only on ice (c) with the motion (d) only upwards
13. 13.🪝 A wheel and axle is a big wheel fixed to … (a) a smaller rod (axle) (b) a flat ramp (c) a sharp wedge (d) a loose rope
14. 14.⚖️ A lever bar balances. The load is ? N at 10 cm from the fulcrum. The effort is 30 N at 90 cm from the fulcrum on the other side. What is the missing force in newtons?
15. 15.⚖️ Along a straight bar, measured from the left end, the effort is at 0 cm, the fulcrum at 40 cm and the load at 30 cm. Which class of lever is it? (a) class 3 (b) class 1 (c) class 2
16. 16.⚖️ A lever bar balances. The load is ? N at 40 cm from the fulcrum. The effort is 280 N at 100 cm from the fulcrum on the other side. What is the missing force in newtons?
17. 17.🪝 A pulley system lifts a 380 N load with an effort of 190 N. What is its mechanical advantage (MA)?
18. 18.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 2 N, a carpet 4 N, sandpaper 7 N, ice 1 N. Which surface gave the least friction? (a) sandpaper (b) a carpet (c) ice (d) a wooden plank
19. 19.💪 Is closing a drawer a push or a pull? (a) a push (b) a pull
20. 20.💪 Which force pulls everything towards the Earth? (a) magnetism (b) gravity (c) wind (d) friction
21. 21.🛞 More or less friction: skating on ice? (a) more friction (b) less friction
22. 22.True or false: your forearm is a class 1 lever (fulcrum in the middle). (a) True (b) False
23. 23.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 5 N, a wooden plank 6 N, a carpet 7 N, ice 2 N. Which surface gave the least friction? (a) a wooden plank (b) ice (c) a carpet (d) a glass sheet
24. 24.🏋️ Pushing a crate 8 m took 1280 J of work. What force was used, in newtons?
25. 25.💪 A bag has a mass of 45 kg. Taking 1 kg to weigh about 10 N, what is its weight in newtons?
26. 26.⚖️ A seesaw balances. Zoya (140 N) sits ? m from the pivot on one side; Kabir (140 N) sits 1 m from the pivot on the other side. What is the missing distance in metres?
27. 27.⚖️ A lever bar balances. The load is 300 N at ? cm from the fulcrum. The effort is 60 N at 100 cm from the fulcrum on the other side. What is the missing distance in centimetres?
28. 28.⚖️ What is the pivot point of a lever called? (a) the load (b) the axle (c) the effort (d) the fulcrum
29. 29.⚙️ Which simple machine is a knife edge? (a) lever (b) wedge (c) screw (d) pulley
30. 30.🛞 Rubbing your hands fast makes them … (a) wet (b) magnetic (c) warm (d) cold
31. 31.🏋️ Work is done when a force moves something … (a) without moving it (b) only upwards (c) very slowly (d) through a distance
32. 32.True or false: a crowbar is a class 1 lever (fulcrum in the middle). (a) False (b) True
33. 33.⚖️ A lever bar balances. The load is 630 N at ? cm from the fulcrum. The effort is 180 N at 70 cm from the fulcrum on the other side. What is the missing distance in centimetres?
34. 34.💪 Two children push a box to the right, one with 25 N and the other with 5 N. What is the net (total) force on the box, in newtons?
35. 35.⚖️ A seesaw balances. Asha (120 N) sits ? m from the pivot on one side; Ravi (120 N) sits 1 m from the pivot on the other side. What is the missing distance in metres?
36. 36.🪝 A pulley system lifts a 360 N load with an effort of 180 N. What is its mechanical advantage (MA)?
37. 37.🏋️ A smooth ramp is 3 m long and rises 1 m. What effort pushes a 300 N box up it, in newtons? (ideal ramp, no friction)
38. 38.🏋️ A longer ramp to the same height needs … (a) the same effort (b) more effort (c) less effort (d) no effort
39. 39.Which of these is a pulley? (a) a claw hammer on a nail (b) a flagpole rope wheel (c) a chisel (d) a nutcracker
40. 40.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 7 N, a carpet 8 N, ice 3 N, a glass sheet 6 N. Which surface gave the most friction? (a) a glass sheet (b) ice (c) a carpet (d) a wooden plank

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