Engineering Worksheet: Part 2 Test

Engineering lesson 16: Part 2 test: forces and machines · Set 498 · 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 is the odd one out? (a) chalk on a gym bar (b) a grippy rubber sole (c) a wheel on ball bearings (d) sand on a slippery path
2. 2.⚖️ In a class 1 lever, what is in the middle? (a) the load (b) the fulcrum (c) nothing (d) the effort
3. 3.⚙️ Which simple machine is a crowbar? (a) screw (b) pulley (c) lever (d) wheel and axle
4. 4.⚖️ A seesaw balances. Ravi (? N) sits 2 m from the pivot on one side; Arjun (320 N) sits 2 m from the pivot on the other side. What is the missing weight in newtons?
5. 5.💪 Which can a force NOT do? (a) start it moving (b) change its shape (c) stop it moving (d) change its colour
6. 6.🔍 Which is the odd one out? (a) a bottle opener (b) a crowbar (c) a truck loading ramp (d) a seesaw
7. 7.⚖️ A lever balances when … (a) both weights are equal (b) turning effects match (c) the bar is short (d) the fulcrum moves
8. 8.🛞 More or less friction: a wet tiled floor? (a) less friction (b) more friction
9. 9.True or false: powder on a carrom board gives more friction. (a) False (b) True
10. 10.⚖️ On a seesaw, a heavier child should sit … (a) closer to the pivot (b) on the pivot (c) farther from the pivot (d) anywhere
11. 11.⚖️ Going along a lever from one end to the other, the order is: fulcrum, load, effort. Which class of lever is it? (a) class 2 (b) class 3 (c) class 1
12. 12.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 14 N, ice 4 N, a glass sheet 7 N, a wooden plank 11 N. Which surface gave the most friction? (a) a wooden plank (b) a glass sheet (c) ice (d) a carpet
13. 13.🛞 Is friction helpful or a problem here: a knot holding a rope? (a) helpful (b) a problem
14. 14.Which of these is caused by muscular force? (a) rubbing hands warms them (b) lifting a school bag (c) shoes grip the floor (d) a thrown ball comes down
15. 15.True or false: a pair of scissors is a class 2 lever (load in the middle). (a) True (b) False
16. 16.💪 Which force is at work: an apple falls down? (a) muscular force (b) gravity (c) friction (d) magnetic force
17. 17.True or false: your forearm is a class 3 lever (effort in the middle). (a) False (b) True
18. 18.💪 Is a tug of war a push or a pull? (a) a pull (b) a push
19. 19.⚙️ Which simple machine is a door stopper? (a) wedge (b) screw (c) inclined plane (d) lever
20. 20.Which of these is an inclined plane? (a) a door stopper (b) a seesaw (c) a truck loading ramp (d) a bottle cap
21. 21.💪 Which force is at work: pedalling a cycle? (a) gravity (b) muscular force (c) friction (d) magnetic force
22. 22.⚖️ A seesaw balances. Arjun (120 N) sits 3 m from the pivot on one side; Meena (360 N) sits ? m from the pivot on the other side. What is the missing distance in metres?
23. 23.🪝 Fixed or movable pulley: which one stays in one place? (a) a fixed pulley (b) a movable pulley
24. 24.🏋️ An 18 kg box is lifted straight up by 2 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
25. 25.🪝 A load of 480 N hangs from a pulley system in which 2 rope sections hold up the load. What effort is needed, in newtons? (ideal pulleys)
26. 26.⚖️ A seesaw balances. Asha (? N) sits 3 m from the pivot on one side; Ravi (540 N) sits 2 m from the pivot on the other side. What is the missing weight in newtons?
27. 27.🔍 Which is the odd one out? (a) a crowbar (b) a seesaw (c) a well-bucket rope wheel (d) a nutcracker
28. 28.⚖️ 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
29. 29.True or false: a movable pulley rises with the load. (a) False (b) True
30. 30.True or false: a seesaw is a screw. (a) True (b) False
31. 31.True or false: the tip of a nail is a wheel and axle. (a) False (b) True
32. 32.🔍 Which is the odd one out? (a) a seesaw (b) a window blind cord (c) a claw hammer on a nail (d) a crowbar
33. 33.🏋️ A 2 kg box is lifted straight up by 2 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
34. 34.⚖️ To lift a heavy rock with a crowbar more easily, push … (a) near the fulcrum (b) on the rock (c) on the fulcrum (d) far from the fulcrum
35. 35.💪 Which force is at work: rubbing hands warms them? (a) magnetic force (b) gravity (c) muscular force (d) friction
36. 36.🛞 More or less friction: a smooth steel slide? (a) more friction (b) less friction
37. 37.🔍 Which is the odd one out? (a) a tyre with deep treads (b) sand on a slippery path (c) a rough doormat (d) a smooth steel slide
38. 38.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 6 N, sandpaper 8 N, ice 1 N, a wooden plank 2 N. How many newtons more were needed on sandpaper than on ice?
39. 39.⚖️ A lever bar balances. The load is 40 N at 50 cm from the fulcrum. The effort is 100 N at ? cm from the fulcrum on the other side. What is the missing distance in centimetres?
40. 40.True or false: a steering wheel is a wedge. (a) False (b) True

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