Engineering Worksheet: Part 2 Test

Engineering lesson 16: Part 2 test: forces and machines · Set 142 · 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.⚖️ Going along a lever from one end to the other, the order is: load, fulcrum, effort. Which class of lever is it? (a) class 2 (b) class 1 (c) class 3
2. 2.💪 A box weighs 540 N. Taking 1 kg to weigh about 10 N, what is its mass in kilograms?
3. 3.True or false: a wet tiled floor gives more friction. (a) True (b) False
4. 4.🔍 Which is the odd one out? (a) powder on a carrom board (b) chalk on a gym bar (c) skating on ice (d) a smooth steel slide
5. 5.⚖️ Along a straight bar, measured from the left end, the effort is at 30 cm, the fulcrum at 70 cm and the load at 10 cm. Which class of lever is it? (a) class 1 (b) class 2 (c) class 3
6. 6.True or false: a tug of war is a push. (a) True (b) False
7. 7.🛞 Is friction helpful or a problem here: walking without slipping? (a) helpful (b) a problem
8. 8.True or false: a rough doormat gives less friction. (a) False (b) True
9. 9.🏋️ A force of 50 N pushes a cart 7 m along the floor. How much work is done, in joules?
10. 10.🪝 A winch has a wheel of radius 32 cm and an axle of radius 4 cm. What effort on the wheel lifts a 560 N bucket on the axle, in newtons? (ideal)
11. 11.🏋️ Pushing a crate 3 m took 1050 J of work. What force was used, in newtons?
12. 12.🪝 A load of 120 N hangs from a pulley system in which 4 rope sections hold up the load. What effort is needed, in newtons? (ideal pulleys)
13. 13.🏋️ Pushing a crate 4 m took 1920 J of work. What force was used, in newtons?
14. 14.💪 Is pressing a doorbell a push or a pull? (a) a pull (b) a push
15. 15.⚖️ In a class 1 lever, what is in the middle? (a) the effort (b) nothing (c) the fulcrum (d) the load
16. 16.⚖️ In a class 2 lever, what is in the middle? (a) the load (b) the fulcrum (c) the effort (d) the axle
17. 17.🪝 A load of 60 N hangs from a pulley system in which 2 rope sections hold up the load. What effort is needed, in newtons? (ideal pulleys)
18. 18.True or false: a pair of kitchen tongs is a class 2 lever (load in the middle). (a) True (b) False
19. 19.True or false: pressing a doorbell is a pull. (a) False (b) True
20. 20.⚙️ Most simple machines make work easier by letting us … (a) switch off gravity (b) make new energy (c) use a smaller force (d) stop all friction
21. 21.⚖️ Turning effect = force × … (a) mass of fulcrum (b) colour of bar (c) distance from fulcrum (d) time taken
22. 22.🪝 Fixed or movable pulley: which one only changes direction? (a) a movable pulley (b) a fixed pulley
23. 23.🏋️ A 20 kg box is lifted straight up by 5 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
24. 24.⚖️ In a class 3 lever, what is in the middle? (a) the effort (b) the pulley (c) the fulcrum (d) the load
25. 25.⚖️ A lever bar balances. The load is ? N at 30 cm from the fulcrum. The effort is 240 N at 40 cm from the fulcrum on the other side. What is the missing force in newtons?
26. 26.💪 Which force is at work: a thrown ball comes down? (a) magnetic force (b) muscular force (c) gravity (d) friction
27. 27.⚖️ 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
28. 28.🏋️ A machine lifts a load of 320 N when you push with 80 N. What is its mechanical advantage (MA)?
29. 29.🪝 Fixed or movable pulley: which one halves the effort? (a) a movable pulley (b) a fixed pulley
30. 30.💪 Two equal forces push on a box from opposite sides. They are … (a) balanced (b) gravity (c) unbalanced (d) doubled
31. 31.⚖️ Along a straight bar, measured from the left end, the effort is at 40 cm, the fulcrum at 80 cm and the load at 20 cm. Which class of lever is it? (a) class 1 (b) class 2 (c) class 3
32. 32.Which of these is an inclined plane? (a) a knife edge (b) a crane hook block (c) a wheelchair ramp (d) a screw jack
33. 33.🛞 More or less friction: skating on ice? (a) less friction (b) more friction
34. 34.⚖️ Along a straight bar, measured from the left end, the effort is at 0 cm, the fulcrum at 20 cm and the load at 30 cm. Which class of lever is it? (a) class 3 (b) class 1 (c) class 2
35. 35.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 5 N, a carpet 9 N, sandpaper 12 N, ice 4 N. Which surface gave the least friction? (a) a wooden plank (b) sandpaper (c) ice (d) a carpet
36. 36.🛞 Is friction helpful or a problem here: a knot holding a rope? (a) a problem (b) helpful
37. 37.🪝 A load of 210 N hangs from a pulley system in which 3 rope sections hold up the load. What effort is needed, in newtons? (ideal pulleys)
38. 38.🔍 Which is the odd one out? (a) a window blind cord (b) a wood screw (c) a well-bucket rope wheel (d) a crane hook block
39. 39.True or false: a movable pulley stays in one place. (a) True (b) False
40. 40.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 2 N, a wooden plank 3 N, sandpaper 4 N, ice 1 N. Which surface gave the most friction? (a) a glass sheet (b) sandpaper (c) ice (d) a wooden plank

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