Engineering Worksheet: Part 2 Test

Engineering lesson 16: Part 2 test: forces and machines · Set 343 · 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.💪 Which force is at work: an apple falls down? (a) friction (b) magnetic force (c) muscular force (d) gravity
2. 2.True or false: pressing a doorbell is a push. (a) False (b) True
3. 3.True or false: a rough doormat gives more friction. (a) False (b) True
4. 4.⚖️ In a class 1 lever, what is in the middle? (a) the effort (b) the load (c) nothing (d) the fulcrum
5. 5.⚙️ Which simple machine is a wheelchair ramp? (a) screw (b) lever (c) wedge (d) inclined plane
6. 6.⚖️ Which class of lever is a beam balance? (a) class 2 (b) class 1 (c) class 3
7. 7.⚖️ Which class of lever is a lemon squeezer? (a) class 2 (b) class 3 (c) class 1
8. 8.⚖️ A seesaw balances. Kabir (400 N) sits 1 m from the pivot on one side; Asha (200 N) sits ? m from the pivot on the other side. What is the missing distance in metres?
9. 9.🏋️ Pushing a crate 9 m took 990 J of work. What force was used, in newtons?
10. 10.🪝 A pulley system has 4 rope sections holding up the load. To lift the load by 4 m, how many metres of rope must you pull?
11. 11.⚖️ Along a straight bar, measured from the left end, the effort is at 20 cm, the fulcrum at 60 cm and the load at 30 cm. Which class of lever is it? (a) class 3 (b) class 1 (c) class 2
12. 12.🔍 Which is the odd one out? (a) a box pushed on carpet (b) a wheel on ball bearings (c) sand on a slippery path (d) chalk on a gym bar
13. 13.🪝 A winch has a wheel of radius 24 cm and an axle of radius 4 cm. What effort on the wheel lifts a 120 N bucket on the axle, in newtons? (ideal)
14. 14.⚖️ Which class of lever is a pair of kitchen tongs? (a) class 1 (b) class 3 (c) class 2
15. 15.⚙️ Which simple machine is a door stopper? (a) inclined plane (b) wedge (c) wheel and axle (d) pulley
16. 16.🛞 How can we reduce friction in a machine? (a) add sand (b) make parts rough (c) press parts harder (d) oil the moving parts
17. 17.⚖️ A lever bar balances. The load is 540 N at 10 cm from the fulcrum. The effort is ? N at 60 cm from the fulcrum on the other side. What is the missing force in newtons?
18. 18.⚖️ A seesaw balances. Asha (150 N) sits 3 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?
19. 19.⚙️ Most simple machines make work easier by letting us … (a) make new energy (b) switch off gravity (c) stop all friction (d) use a smaller force
20. 20.⚖️ A seesaw balances. Kabir (200 N) sits 1 m from the pivot on one side; Meena (200 N) sits ? m from the pivot on the other side. What is the missing distance in metres?
21. 21.⚙️ A wedge is … (a) a bar on a pivot (b) a wheel on a rod (c) a rope on a wheel (d) two ramps back to back
22. 22.True or false: a fishing rod is a class 1 lever (fulcrum in the middle). (a) True (b) False
23. 23.🛞 Which surface gives the MOST friction to a sliding block? (a) polished marble (b) glass (c) sandpaper (d) ice
24. 24.⚖️ Going along a lever from one end to the other, the order is: load, effort, fulcrum. Which class of lever is it? (a) class 1 (b) class 2 (c) class 3
25. 25.🔍 Which is the odd one out? (a) a rough doormat (b) a wet tiled floor (c) oil on a squeaky hinge (d) skating on ice
26. 26.🛞 Rubbing your hands fast makes them … (a) wet (b) cold (c) warm (d) magnetic
27. 27.⚖️ Which class of lever is a seesaw? (a) class 3 (b) class 2 (c) class 1
28. 28.🏋️ Pushing a crate 2 m took 860 J of work. What force was used, in newtons?
29. 29.⚖️ A lever bar balances. The load is 140 N at ? cm from the fulcrum. The effort is 80 N at 70 cm from the fulcrum on the other side. What is the missing distance in centimetres?
30. 30.True or false: a truck loading ramp is an inclined plane. (a) False (b) True
31. 31.True or false: a seesaw is a class 2 lever (load in the middle). (a) True (b) False
32. 32.⚖️ A seesaw balances. Asha (360 N) sits 1 m from the pivot on one side; Zoya (180 N) sits ? m from the pivot on the other side. What is the missing distance in metres?
33. 33.🏋️ A 13 kg box is lifted straight up by 3 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
34. 34.🛞 Is friction helpful or a problem here: a knot holding a rope? (a) a problem (b) helpful
35. 35.⚙️ How many simple machines are there in the usual list? (a) 12 (b) 10 (c) 3 (d) 6
36. 36.🔍 Which is the odd one out? (a) an axe blade (b) the tip of a nail (c) a door stopper (d) a playground slide
37. 37.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 4 N, a carpet 6 N, sandpaper 9 N, ice 3 N. Which surface gave the least friction? (a) ice (b) sandpaper (c) a glass sheet (d) a carpet
38. 38.⚙️ Which simple machine is a window blind cord? (a) screw (b) pulley (c) wedge (d) wheel and axle
39. 39.🪝 A load of 660 N hangs from a pulley system in which 3 rope sections hold up the load. What effort is needed, in newtons? (ideal pulleys)
40. 40.🛞 Friction acts … (a) against the motion (b) with the motion (c) only on ice (d) only upwards

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