Engineering Worksheet: Part 2 Test

Engineering lesson 16: Part 2 test: forces and machines · Set 730 · 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.🏋️ In which unit is work measured? (a) watt hour (b) metre (m) (c) joule (J) (d) newton (N)
2. 2.⚖️ Which class of lever is a pair of pliers? (a) class 3 (b) class 1 (c) class 2
3. 3.⚖️ A seesaw balances. Ravi (200 N) sits ? m from the pivot on one side; Meena (200 N) sits 2 m from the pivot on the other side. What is the missing distance in metres?
4. 4.🔍 Which is the odd one out? (a) a well winch handle (b) a round doorknob (c) a steering wheel (d) a window blind cord
5. 5.True or false: a pair of pliers is a class 2 lever (load in the middle). (a) True (b) False
6. 6.💪 A cart is pulled to the right with 30 N and to the left with 35 N. Which way does the net force act? (a) to the right (b) to the left (c) no net force
7. 7.⚖️ A lever bar balances. The load is 70 N at 20 cm from the fulcrum. The effort is 20 N at ? cm from the fulcrum on the other side. What is the missing distance in centimetres?
8. 8.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 9 N, ice 1 N, a glass sheet 3 N, a wooden plank 6 N. Which surface gave the most friction? (a) ice (b) a wooden plank (c) sandpaper (d) a glass sheet
9. 9.💪 Which force is at work: a fridge magnet sticks? (a) magnetic force (b) gravity (c) friction (d) muscular force
10. 10.⚙️ Which simple machine is a door stopper? (a) pulley (b) wedge (c) inclined plane (d) lever
11. 11.💪 Which force is at work: a rolling ball slows? (a) friction (b) gravity (c) muscular force (d) magnetic force
12. 12.True or false: a well-bucket rope wheel is a pulley. (a) True (b) False
13. 13.True or false: pressing a doorbell is a pull. (a) True (b) False
14. 14.💪 In which unit do we measure force? (a) newton (N) (b) litre (L) (c) metre (m) (d) second (s)
15. 15.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 4 N, a wooden plank 5 N, a carpet 6 N, sandpaper 9 N. How many newtons more were needed on sandpaper than on a glass sheet?
16. 16.⚖️ A seesaw balances. Kabir (? N) sits 2 m from the pivot on one side; Zoya (240 N) sits 1 m from the pivot on the other side. What is the missing weight in newtons?
17. 17.⚙️ A screw is really … (a) a kind of wheel (b) a tiny pulley (c) a bent lever (d) a ramp wrapped round
18. 18.⚖️ A lever bar balances. The load is 490 N at 40 cm from the fulcrum. The effort is ? N at 70 cm from the fulcrum on the other side. What is the missing force in newtons?
19. 19.⚖️ On a seesaw, a heavier child should sit … (a) farther from the pivot (b) anywhere (c) closer to the pivot (d) on the pivot
20. 20.💪 Which force is at work: an apple falls down? (a) muscular force (b) friction (c) gravity (d) magnetic force
21. 21.True or false: a tyre with deep treads gives less friction. (a) True (b) False
22. 22.💪 Which force is at work: a compass needle turns? (a) muscular force (b) magnetic force (c) friction (d) gravity
23. 23.🛞 More or less friction: a grippy rubber sole? (a) more friction (b) less friction
24. 24.⚖️ 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 3 (c) class 1
25. 25.💪 Which force is at work: a magnet picks up pins? (a) friction (b) muscular force (c) gravity (d) magnetic force
26. 26.⚖️ Turning effect = force × … (a) time taken (b) distance from fulcrum (c) colour of bar (d) mass of fulcrum
27. 27.🛞 Is friction helpful or a problem here: tyres wearing down? (a) helpful (b) a problem
28. 28.💪 Is closing a drawer a push or a pull? (a) a pull (b) a push
29. 29.💪 Is drawing up a well bucket a push or a pull? (a) a pull (b) a push
30. 30.💪 A force is a … (a) kind of colour (b) unit of time (c) push or a pull (d) type of sound
31. 31.🪝 Fixed or movable pulley: which one rises with the load? (a) a movable pulley (b) a fixed pulley
32. 32.True or false: plucking a mango is a push. (a) False (b) True
33. 33.🪝 Fixed or movable pulley: which one halves the effort? (a) a fixed pulley (b) a movable pulley
34. 34.🪝 A load of 80 N hangs from a pulley system in which 2 rope sections hold up the load. What effort is needed, in newtons? (ideal pulleys)
35. 35.💪 Two children push a box to the right, one with 25 N and the other with 55 N. What is the net (total) force on the box, in newtons?
36. 36.True or false: a pair of pliers is a class 1 lever (fulcrum in the middle). (a) True (b) False
37. 37.⚖️ Which class of lever is a pair of scissors? (a) class 1 (b) class 2 (c) class 3
38. 38.🪝 A winch has a wheel of radius 21 cm and an axle of radius 3 cm. What effort on the wheel lifts a 1400 N bucket on the axle, in newtons? (ideal)
39. 39.🔍 Which is the odd one out? (a) a bottle opener (b) a seesaw (c) a well winch handle (d) a crowbar
40. 40.⚙️ Which simple machine is the tip of a nail? (a) screw (b) wedge (c) inclined plane (d) wheel and axle

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