Engineering Worksheet: Part 2 Test

Engineering lesson 16: Part 2 test: forces and machines · Set 256 · 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) a crowbar (b) a nutcracker (c) a well winch handle (d) a seesaw
2. 2.⚖️ Turning effect = force × … (a) distance from fulcrum (b) time taken (c) mass of fulcrum (d) colour of bar
3. 3.🔍 Which is the odd one out? (a) a rough doormat (b) a box pushed on carpet (c) a wheel on ball bearings (d) sand on a slippery path
4. 4.🛞 Is friction helpful or a problem here: striking a matchstick? (a) helpful (b) a problem
5. 5.🪝 A wheel and axle is a big wheel fixed to … (a) a flat ramp (b) a loose rope (c) a sharp wedge (d) a smaller rod (axle)
6. 6.True or false: a box pushed on carpet gives more friction. (a) False (b) True
7. 7.🪝 Fixed or movable pulley: which one is on a flagpole top? (a) a fixed pulley (b) a movable pulley
8. 8.⚖️ A seesaw balances. Ravi (300 N) sits 2 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.True or false: the tip of a nail is a pulley. (a) True (b) False
10. 10.Which of these is caused by friction? (a) a magnet picks up pins (b) a fridge magnet sticks (c) an apple falls down (d) rubbing hands warms them
11. 11.💪 Which force is at work: a fridge magnet sticks? (a) magnetic force (b) muscular force (c) friction (d) gravity
12. 12.⚖️ A seesaw balances. Arjun (150 N) sits ? m from the pivot on one side; Kabir (150 N) sits 1 m from the pivot on the other side. What is the missing distance in metres?
13. 13.🔍 Which is the odd one out? (a) a tyre with deep treads (b) a smooth steel slide (c) a rough doormat (d) chalk on a gym bar
14. 14.🪝 A winch has a wheel of radius 35 cm and an axle of radius 5 cm. What effort on the wheel lifts a 1330 N bucket on the axle, in newtons? (ideal)
15. 15.⚖️ What is the pivot point of a lever called? (a) the load (b) the fulcrum (c) the effort (d) the axle
16. 16.🪝 A load of 420 N hangs from a pulley system in which 3 rope sections hold up the load. What effort is needed, in newtons? (ideal pulleys)
17. 17.True or false: hitting a cricket ball is a pull. (a) True (b) False
18. 18.True or false: pushing a trolley is a pull. (a) False (b) True
19. 19.⚖️ A lever balances when … (a) the bar is short (b) turning effects match (c) both weights are equal (d) the fulcrum moves
20. 20.🏋️ A smooth ramp is 10 m long and rises 2 m. What effort pushes a 2250 N box up it, in newtons? (ideal ramp, no friction)
21. 21.True or false: a nutcracker is a class 2 lever (load in the middle). (a) True (b) False
22. 22.⚖️ Which class of lever is a fishing rod? (a) class 3 (b) class 2 (c) class 1
23. 23.💪 Is pressing a doorbell a push or a pull? (a) a push (b) a pull
24. 24.🪝 Fixed or movable pulley: which one hangs on the rope loop? (a) a fixed pulley (b) a movable pulley
25. 25.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 6 N, a wooden plank 10 N, a carpet 14 N, ice 4 N. How many newtons more were needed on a carpet than on ice?
26. 26.🏋️ Mechanical advantage (MA) = … (a) load ÷ effort (b) load × effort (c) effort ÷ load (d) load + effort
27. 27.⚖️ A lever bar balances. The load is ? N at 20 cm from the fulcrum. The effort is 140 N at 60 cm from the fulcrum on the other side. What is the missing force in newtons?
28. 28.True or false: an axe blade is a pulley. (a) False (b) True
29. 29.🪝 A pulley system lifts a 240 N load with an effort of 80 N. What is its mechanical advantage (MA)?
30. 30.⚖️ A lever bar balances. The load is ? N at 50 cm from the fulcrum. The effort is 350 N at 70 cm from the fulcrum on the other side. What is the missing force in newtons?
31. 31.🏋️ Work is done when a force moves something … (a) through a distance (b) without moving it (c) only upwards (d) very slowly
32. 32.⚖️ Which class of lever is a pair of pliers? (a) class 3 (b) class 1 (c) class 2
33. 33.⚖️ A lever bar balances. The load is 200 N at 20 cm from the fulcrum. The effort is ? N at 40 cm from the fulcrum on the other side. What is the missing force in newtons?
34. 34.True or false: a fishing rod is a class 3 lever (effort in the middle). (a) False (b) True
35. 35.⚖️ On a seesaw, a heavier child should sit … (a) on the pivot (b) closer to the pivot (c) anywhere (d) farther from the pivot
36. 36.🔍 Which is the odd one out? (a) a wheelchair ramp (b) a chisel (c) a truck loading ramp (d) a playground slide
37. 37.True or false: pressing a doorbell is a pull. (a) False (b) True
38. 38.⚖️ Which class of lever is a wheelbarrow? (a) class 2 (b) class 3 (c) class 1
39. 39.🏋️ In which unit is work measured? (a) newton (N) (b) watt hour (c) joule (J) (d) metre (m)
40. 40.True or false: opening a drawer is a pull. (a) False (b) True

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