Engineering Worksheet: Part 2 Test

Engineering lesson 16: Part 2 test: forces and machines · Set 398 · 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.🏋️ Pushing a crate 6 m took 780 J of work. What force was used, in newtons?
2. 2.🛞 Is friction helpful or a problem here: dragging a heavy box? (a) a problem (b) helpful
3. 3.🛞 More or less friction: a wheel on ball bearings? (a) more friction (b) less friction
4. 4.⚖️ A lever bar balances. The load is 320 N at ? cm from the fulcrum. The effort is 40 N at 80 cm from the fulcrum on the other side. What is the missing distance in centimetres?
5. 5.🔍 Which is the odd one out? (a) a playground slide (b) a knife edge (c) a chisel (d) the tip of a nail
6. 6.⚙️ Which simple machine is a bottle cap? (a) wedge (b) screw (c) pulley (d) inclined plane
7. 7.🪝 A winch has a wheel of radius 14 cm and an axle of radius 2 cm. What effort on the wheel lifts an 840 N bucket on the axle, in newtons? (ideal)
8. 8.💪 Which can a force NOT do? (a) change its shape (b) change its colour (c) start it moving (d) stop it moving
9. 9.🏋️ A 6 kg box is lifted straight up by 1 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
10. 10.True or false: a wheel on ball bearings gives more friction. (a) True (b) False
11. 11.⚖️ A lever bar balances. The load is ? N at 30 cm from the fulcrum. The effort is 60 N at 30 cm from the fulcrum on the other side. What is the missing force in newtons?
12. 12.⚖️ Along a straight bar, measured from the left end, the effort is at 20 cm, the fulcrum at 40 cm and the load at 60 cm. Which class of lever is it? (a) class 1 (b) class 3 (c) class 2
13. 13.True or false: a fixed pulley makes you pull 2× rope. (a) True (b) False
14. 14.⚖️ A lever bar balances. The load is ? N at 30 cm from the fulcrum. The effort is 270 N at 50 cm from the fulcrum on the other side. What is the missing force in newtons?
15. 15.🛞 More or less friction: a box pushed on carpet? (a) more friction (b) less friction
16. 16.🪝 A wheel and axle is a big wheel fixed to … (a) a sharp wedge (b) a flat ramp (c) a loose rope (d) a smaller rod (axle)
17. 17.⚙️ Which simple machine is a knife edge? (a) wedge (b) wheel and axle (c) screw (d) lever
18. 18.⚙️ A screw is really … (a) a kind of wheel (b) a ramp wrapped round (c) a tiny pulley (d) a bent lever
19. 19.True or false: the tip of a nail is a lever. (a) False (b) True
20. 20.⚖️ A seesaw balances. Ravi (220 N) sits 4 m from the pivot on one side; Meena (? N) sits 2 m from the pivot on the other side. What is the missing weight in newtons?
21. 21.True or false: a pair of scissors is a class 2 lever (load in the middle). (a) True (b) False
22. 22.💪 A bag has a mass of 29 kg. Taking 1 kg to weigh about 10 N, what is its weight in newtons?
23. 23.⚖️ A seesaw balances. Kabir (760 N) sits 4 m from the pivot on one side; Meena (760 N) sits ? m from the pivot on the other side. What is the missing distance in metres?
24. 24.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 11 N, ice 4 N, a glass sheet 5 N, a wooden plank 7 N. How many newtons more were needed on a carpet than on ice?
25. 25.💪 Which force is at work: rain falls to the ground? (a) gravity (b) friction (c) magnetic force (d) muscular force
26. 26.True or false: a wood screw is a wheel and axle. (a) False (b) True
27. 27.⚖️ A lever bar balances. The load is 420 N at 10 cm from the fulcrum. The effort is 70 N at ? cm from the fulcrum on the other side. What is the missing distance in centimetres?
28. 28.True or false: your forearm is a class 3 lever (effort in the middle). (a) False (b) True
29. 29.True or false: hitting a cricket ball is a push. (a) False (b) True
30. 30.⚖️ A lever bar balances. The load is 70 N at 40 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?
31. 31.True or false: a fixed pulley needs effort = load. (a) True (b) False
32. 32.🪝 A load of 240 N hangs from a pulley system in which 3 rope sections hold up the load. What effort is needed, in newtons? (ideal pulleys)
33. 33.⚖️ A seesaw balances. Ravi (760 N) sits 3 m from the pivot on one side; Arjun (? N) sits 4 m from the pivot on the other side. What is the missing weight in newtons?
34. 34.🪝 A pulley system has 4 rope sections holding up the load. To lift the load by 8 m, how many metres of rope must you pull?
35. 35.🏋️ A smooth ramp is 10 m long and rises 2 m. What effort pushes a 3500 N box up it, in newtons? (ideal ramp, no friction)
36. 36.🪝 A well winch has a handle (wheel) of radius 4 cm turning an axle of radius 1 cm. What is its mechanical advantage (MA)?
37. 37.⚙️ How many simple machines are there in the usual list? (a) 6 (b) 3 (c) 12 (d) 10
38. 38.True or false: a fixed pulley hangs on the rope loop. (a) True (b) False
39. 39.🛞 Is friction helpful or a problem here: shoe soles wearing out? (a) a problem (b) helpful
40. 40.True or false: a lemon squeezer is a class 1 lever (fulcrum in the middle). (a) False (b) True

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