Engineering Worksheet: Part 2 Test

Engineering lesson 16: Part 2 test: forces and machines · Set 16 · 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 smooth ramp is 18 m long and rises 3 m. What effort pushes a 900 N box up it, in newtons? (ideal ramp, no friction)
2. 2.⚖️ A seesaw balances. Kabir (170 N) sits 4 m from the pivot on one side; Arjun (680 N) sits ? m from the pivot on the other side. What is the missing distance in metres?
3. 3.⚖️ A seesaw balances. Zoya (? N) sits 4 m from the pivot on one side; Meena (760 N) sits 1 m from the pivot on the other side. What is the missing weight in newtons?
4. 4.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 3 N, a glass sheet 4 N, a carpet 5 N, sandpaper 7 N. Which surface gave the least friction? (a) a glass sheet (b) sandpaper (c) a carpet (d) ice
5. 5.⚖️ 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 3 (c) class 2
6. 6.⚖️ A seesaw balances. Ravi (100 N) sits ? m from the pivot on one side; Zoya (300 N) sits 1 m from the pivot on the other side. What is the missing distance in metres?
7. 7.True or false: a box pushed on carpet gives less friction. (a) False (b) True
8. 8.🏋️ Pushing a crate 7 m took 1470 J of work. What force was used, in newtons?
9. 9.🏋️ A machine lifts a load of 210 N when you push with 70 N. What is its mechanical advantage (MA)?
10. 10.🏋️ Pushing a crate 4 m took 880 J of work. What force was used, in newtons?
11. 11.🪝 A wheel and axle is a big wheel fixed to … (a) a flat ramp (b) a loose rope (c) a sharp wedge (d) a smaller rod (axle)
12. 12.⚖️ On a seesaw, a heavier child should sit … (a) farther from the pivot (b) closer to the pivot (c) on the pivot (d) anywhere
13. 13.⚖️ In a class 3 lever, what is in the middle? (a) the fulcrum (b) the effort (c) the pulley (d) the load
14. 14.🪝 A bucket weighing 400 N is lifted with a single fixed pulley at the top of a well. What effort is needed, in newtons? (ideal pulley, no friction)
15. 15.True or false: a fixed pulley makes you pull 2× rope. (a) True (b) False
16. 16.True or false: a wheelbarrow is a class 3 lever (effort in the middle). (a) True (b) False
17. 17.🛞 More or less friction: a rough doormat? (a) less friction (b) more friction
18. 18.🏋️ A smooth ramp is 6 m long and rises 3 m. What effort pushes a 500 N box up it, in newtons? (ideal ramp, no friction)
19. 19.True or false: a knife edge is a wheel and axle. (a) True (b) False
20. 20.⚖️ Which class of lever is a pair of tweezers? (a) class 1 (b) class 3 (c) class 2
21. 21.🏋️ A smooth ramp is 10 m long and rises 2 m. What effort pushes a 250 N box up it, in newtons? (ideal ramp, no friction)
22. 22.⚖️ A lever bar balances. The load is 360 N at 50 cm from the fulcrum. The effort is 450 N at ? cm from the fulcrum on the other side. What is the missing distance in centimetres?
23. 23.💪 Which force is at work: a magnet picks up pins? (a) muscular force (b) magnetic force (c) friction (d) gravity
24. 24.⚖️ Which class of lever is a pair of pliers? (a) class 1 (b) class 2 (c) class 3
25. 25.⚖️ A seesaw balances. Asha (140 N) sits 1 m from the pivot on one side; Arjun (? N) sits 1 m from the pivot on the other side. What is the missing weight in newtons?
26. 26.⚖️ Along a straight bar, measured from the left end, the effort is at 60 cm, the fulcrum at 40 cm and the load at 30 cm. Which class of lever is it? (a) class 1 (b) class 2 (c) class 3
27. 27.🪝 A winch has a wheel of radius 10 cm and an axle of radius 5 cm. What effort on the wheel lifts a 120 N bucket on the axle, in newtons? (ideal)
28. 28.⚖️ Which class of lever is a crowbar? (a) class 2 (b) class 3 (c) class 1
29. 29.True or false: powder on a carrom board gives less friction. (a) False (b) True
30. 30.⚖️ A seesaw balances. Arjun (? N) sits 4 m from the pivot on one side; Kabir (800 N) sits 1 m from the pivot on the other side. What is the missing weight in newtons?
31. 31.🔍 Which is the odd one out? (a) a crowbar (b) a nut and bolt (c) a wood screw (d) a screw jack
32. 32.⚖️ Going along a lever from one end to the other, the order is: effort, load, fulcrum. Which class of lever is it? (a) class 1 (b) class 3 (c) class 2
33. 33.⚖️ A lever bar balances. The load is 140 N at 20 cm from the fulcrum. The effort is 40 N at ? cm from the fulcrum on the other side. What is the missing distance in centimetres?
34. 34.🏋️ A 12 kg box is lifted straight up by 4 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
35. 35.🪝 What does a single fixed pulley change? (a) the colour of rope (b) gravity (c) the direction of pull (d) the size of the load
36. 36.🏋️ Pushing a crate 6 m took 300 J of work. What force was used, in newtons?
37. 37.💪 Is drawing up a well bucket a push or a pull? (a) a pull (b) a push
38. 38.🪝 A bucket weighing 450 N is lifted with a single fixed pulley at the top of a well. What effort is needed, in newtons? (ideal pulley, no friction)
39. 39.💪 Which force pulls everything towards the Earth? (a) friction (b) magnetism (c) gravity (d) wind
40. 40.🛞 Is friction helpful or a problem here: brakes stopping a cycle? (a) a problem (b) helpful

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