Engineering Worksheet: Part 2 Test

Engineering lesson 16: Part 2 test: forces and machines · Set 976 · 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 20 N at 50 cm from the fulcrum. The effort is 50 N at ? cm from the fulcrum on the other side. What is the missing distance in centimetres?
2. 2.⚖️ A lever balances when … (a) the fulcrum moves (b) turning effects match (c) both weights are equal (d) the bar is short
3. 3.True or false: a pair of pliers is a class 3 lever (effort in the middle). (a) True (b) False
4. 4.🔍 Which is the odd one out? (a) a chisel (b) an axe blade (c) the tip of a nail (d) a crane hook block
5. 5.⚖️ Along a straight bar, measured from the left end, the effort is at 50 cm, the fulcrum at 80 cm and the load at 30 cm. Which class of lever is it? (a) class 3 (b) class 1 (c) class 2
6. 6.🏋️ In which unit is work measured? (a) newton (N) (b) joule (J) (c) watt hour (d) metre (m)
7. 7.🛞 More or less friction: a wheel on ball bearings? (a) less friction (b) more friction
8. 8.True or false: a crane hook block is a lever. (a) False (b) True
9. 9.True or false: a pair of scissors is a class 1 lever (fulcrum in the middle). (a) False (b) True
10. 10.⚖️ A seesaw balances. Asha (? N) sits 1 m from the pivot on one side; Zoya (150 N) sits 3 m from the pivot on the other side. What is the missing weight in newtons?
11. 11.💪 Is pressing a doorbell a push or a pull? (a) a push (b) a pull
12. 12.⚖️ A seesaw balances. Ravi (560 N) sits ? m from the pivot on one side; Asha (560 N) sits 4 m from the pivot on the other side. What is the missing distance in metres?
13. 13.🪝 A winch has a wheel of radius 35 cm and an axle of radius 5 cm. What effort on the wheel lifts a 210 N bucket on the axle, in newtons? (ideal)
14. 14.🪝 A well winch has a handle (wheel) of radius 12 cm turning an axle of radius 4 cm. What is its mechanical advantage (MA)?
15. 15.🛞 More or less friction: a wet tiled floor? (a) more friction (b) less friction
16. 16.🏋️ Pushing a crate 6 m took 1980 J of work. What force was used, in newtons?
17. 17.⚖️ A lever bar balances. The load is 180 N at 30 cm from the fulcrum. The effort is 90 N at ? cm from the fulcrum on the other side. What is the missing distance in centimetres?
18. 18.🏋️ A 4 kg box is lifted straight up by 2 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
19. 19.🔍 Which is the odd one out? (a) a rough doormat (b) a grippy rubber sole (c) oil on a squeaky hinge (d) a box pushed on carpet
20. 20.🏋️ Mechanical advantage (MA) = … (a) load + effort (b) effort ÷ load (c) load ÷ effort (d) load × effort
21. 21.True or false: a movable pulley only changes direction. (a) False (b) True
22. 22.🏋️ Pushing a crate 3 m took 1140 J of work. What force was used, in newtons?
23. 23.🪝 A well winch has a handle (wheel) of radius 6 cm turning an axle of radius 1 cm. What is its mechanical advantage (MA)?
24. 24.⚖️ Going along a lever from one end to the other, the order is: effort, load, fulcrum. Which class of lever is it? (a) class 3 (b) class 2 (c) class 1
25. 25.True or false: a flagpole rope wheel is a wedge. (a) True (b) False
26. 26.💪 Two children push a box to the right, one with 50 N and the other with 20 N. What is the net (total) force on the box, in newtons?
27. 27.🔍 Which is the odd one out? (a) a screw jack (b) a nut and bolt (c) a knife edge (d) a wood screw
28. 28.🛞 Is friction helpful or a problem here: striking a matchstick? (a) a problem (b) helpful
29. 29.True or false: a fixed pulley is on a flagpole top. (a) False (b) True
30. 30.⚙️ Which simple machine is a flagpole rope wheel? (a) pulley (b) inclined plane (c) screw (d) lever
31. 31.🪝 Fixed or movable pulley: which one makes you pull 2× rope? (a) a fixed pulley (b) a movable pulley
32. 32.💪 Two children push a box to the right, one with 5 N and the other with 75 N. What is the net (total) force on the box, in newtons?
33. 33.⚖️ A seesaw balances. Kabir (150 N) sits 4 m from the pivot on one side; Zoya (? N) sits 1 m from the pivot on the other side. What is the missing weight in newtons?
34. 34.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 11 N, ice 2 N, a glass sheet 6 N, a wooden plank 9 N. Which surface gave the least friction? (a) a glass sheet (b) a wooden plank (c) a carpet (d) ice
35. 35.⚖️ A lever bar balances. The load is ? N at 40 cm from the fulcrum. The effort is 80 N at 40 cm from the fulcrum on the other side. What is the missing force in newtons?
36. 36.💪 Is drawing up a well bucket a push or a pull? (a) a push (b) a pull
37. 37.True or false: plucking a mango is a pull. (a) False (b) True
38. 38.💪 A bag has a mass of 58 kg. Taking 1 kg to weigh about 10 N, what is its weight in newtons?
39. 39.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 1 N, a wooden plank 4 N, a carpet 7 N, sandpaper 8 N. How many newtons more were needed on sandpaper than on ice?
40. 40.🔍 Which is the odd one out? (a) a window blind cord (b) a water tap handle (c) a round doorknob (d) a well winch handle

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