Engineering Worksheet: Part 2 Test

Engineering lesson 16: Part 2 test: forces and machines · Set 832 · 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.True or false: a movable pulley only changes direction. (a) True (b) False
2. 2.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 8 N, a carpet 10 N, ice 3 N, a glass sheet 4 N. Which surface gave the most friction? (a) ice (b) a carpet (c) a wooden plank (d) a glass sheet
3. 3.⚖️ Going along a lever from one end to the other, the order is: load, fulcrum, effort. Which class of lever is it? (a) class 3 (b) class 1 (c) class 2
4. 4.True or false: a flagpole rope wheel is a lever. (a) False (b) True
5. 5.💪 Which force is at work: lifting a school bag? (a) muscular force (b) magnetic force (c) friction (d) gravity
6. 6.Which of these is a lever? (a) a flagpole rope wheel (b) a claw hammer on a nail (c) a truck loading ramp (d) a chisel
7. 7.🛞 Is friction helpful or a problem here: tyres wearing down? (a) a problem (b) helpful
8. 8.True or false: a movable pulley is on a flagpole top. (a) False (b) True
9. 9.True or false: a pair of pliers is a class 2 lever (load in the middle). (a) True (b) False
10. 10.⚖️ In a class 3 lever, what is in the middle? (a) the effort (b) the load (c) the pulley (d) the fulcrum
11. 11.🛞 How can we reduce friction in a machine? (a) add sand (b) press parts harder (c) oil the moving parts (d) make parts rough
12. 12.⚖️ A lever bar balances. The load is 480 N at 20 cm from the fulcrum. The effort is 160 N at ? cm from the fulcrum on the other side. What is the missing distance in centimetres?
13. 13.True or false: a seesaw is a class 1 lever (fulcrum in the middle). (a) True (b) False
14. 14.⚖️ Going along a lever from one end to the other, the order is: effort, load, fulcrum. Which class of lever is it? (a) class 2 (b) class 3 (c) class 1
15. 15.🛞 More or less friction: a wheel on ball bearings? (a) more friction (b) less friction
16. 16.🏋️ Pushing a crate 1 m took 260 J of work. What force was used, in newtons?
17. 17.🏋️ An 11 kg box is lifted straight up by 2 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
18. 18.Which of these is an inclined plane? (a) a playground slide (b) a well-bucket rope wheel (c) a door stopper (d) a crowbar
19. 19.💪 Is pulling a cart a push or a pull? (a) a pull (b) a push
20. 20.🏋️ A machine lifts a load of 660 N when you push with 110 N. What is its mechanical advantage (MA)?
21. 21.💪 Is closing a drawer a push or a pull? (a) a push (b) a pull
22. 22.⚙️ Which simple machine is a crane hook block? (a) lever (b) pulley (c) screw (d) inclined plane
23. 23.⚖️ A seesaw balances. Kabir (? N) sits 1 m from the pivot on one side; Ravi (160 N) sits 1 m from the pivot on the other side. What is the missing weight in newtons?
24. 24.⚖️ Which class of lever is a pair of tweezers? (a) class 1 (b) class 2 (c) class 3
25. 25.🪝 More rope sections holding a load means … (a) the load floats (b) less effort needed (c) no change (d) more effort needed
26. 26.⚖️ Going along a lever from one end to the other, the order is: effort, fulcrum, load. Which class of lever is it? (a) class 3 (b) class 1 (c) class 2
27. 27.⚖️ A lever bar balances. The load is ? N at 20 cm from the fulcrum. The effort is 180 N at 70 cm from the fulcrum on the other side. What is the missing force in newtons?
28. 28.True or false: a crowbar is a class 2 lever (load in the middle). (a) False (b) True
29. 29.🔍 Which is the odd one out? (a) a rough doormat (b) a wet tiled floor (c) skating on ice (d) powder on a carrom board
30. 30.True or false: a movable pulley needs effort = load. (a) True (b) False
31. 31.🏋️ A smooth ramp is 3 m long and rises 1 m. What effort pushes a 150 N box up it, in newtons? (ideal ramp, no friction)
32. 32.⚖️ Along a straight bar, measured from the left end, the effort is at 10 cm, the fulcrum at 80 cm and the load at 50 cm. Which class of lever is it? (a) class 2 (b) class 1 (c) class 3
33. 33.🪝 A winch has a wheel of radius 7 cm and an axle of radius 1 cm. What effort on the wheel lifts a 1260 N bucket on the axle, in newtons? (ideal)
34. 34.🏋️ Work is done when a force moves something … (a) without moving it (b) through a distance (c) only upwards (d) very slowly
35. 35.🔍 Which is the odd one out? (a) a box pushed on carpet (b) a wheel on ball bearings (c) a grippy rubber sole (d) sand on a slippery path
36. 36.True or false: pressing a doorbell is a pull. (a) True (b) False
37. 37.⚖️ Which class of lever is a pair of pliers? (a) class 3 (b) class 1 (c) class 2
38. 38.True or false: powder on a carrom board gives less friction. (a) True (b) False
39. 39.⚖️ On a seesaw, a heavier child should sit … (a) anywhere (b) farther from the pivot (c) closer to the pivot (d) on the pivot
40. 40.🏋️ In which unit is work measured? (a) metre (m) (b) joule (J) (c) watt hour (d) newton (N)

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