Engineering Worksheet: Part 2 Test

Engineering lesson 16: Part 2 test: forces and machines · Set 378 · 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.💪 Two equal forces push on a box from opposite sides. They are … (a) balanced (b) unbalanced (c) doubled (d) gravity
2. 2.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 5 N, a carpet 6 N, sandpaper 9 N, a glass sheet 4 N. Which surface gave the most friction? (a) a carpet (b) a wooden plank (c) a glass sheet (d) sandpaper
3. 3.🔍 Which is the odd one out? (a) a water tap handle (b) a wood screw (c) a bottle cap (d) a jar lid
4. 4.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 4 N, sandpaper 7 N, ice 1 N, a glass sheet 3 N. Which surface gave the least friction? (a) sandpaper (b) a glass sheet (c) a wooden plank (d) ice
5. 5.⚖️ A lever bar balances. The load is 120 N at ? cm from the fulcrum. The effort is 150 N at 40 cm from the fulcrum on the other side. What is the missing distance in centimetres?
6. 6.True or false: oil on a squeaky hinge gives more friction. (a) True (b) False
7. 7.True or false: a rough doormat gives more friction. (a) True (b) False
8. 8.🏋️ Can a simple machine reduce the work done? (a) yes, by half (b) yes, always (c) only on Mondays (d) no, work stays the same
9. 9.🏋️ A force of 70 N pushes a cart 2 m along the floor. How much work is done, in joules?
10. 10.⚖️ On a seesaw, a heavier child should sit … (a) anywhere (b) closer to the pivot (c) on the pivot (d) farther from the pivot
11. 11.⚙️ Which simple machine is a truck loading ramp? (a) pulley (b) wheel and axle (c) inclined plane (d) screw
12. 12.🪝 A pulley system has 4 rope sections holding up the load. To lift the load by 9 m, how many metres of rope must you pull?
13. 13.⚖️ Along a straight bar, measured from the left end, the effort is at 60 cm, the fulcrum at 20 cm and the load at 30 cm. Which class of lever is it? (a) class 1 (b) class 2 (c) class 3
14. 14.Which of these is caused by friction? (a) a magnet picks up pins (b) a compass needle turns (c) shoes grip the floor (d) an apple falls down
15. 15.🏋️ Mechanical advantage (MA) = … (a) load + effort (b) effort ÷ load (c) load × effort (d) load ÷ effort
16. 16.True or false: a fixed pulley rises with the load. (a) False (b) True
17. 17.🪝 A wheel and axle is a big wheel fixed to … (a) a loose rope (b) a sharp wedge (c) a flat ramp (d) a smaller rod (axle)
18. 18.🛞 More or less friction: a grippy rubber sole? (a) more friction (b) less friction
19. 19.⚖️ A lever bar balances. The load is 100 N at ? cm from the fulcrum. The effort is 10 N at 100 cm from the fulcrum on the other side. What is the missing distance in centimetres?
20. 20.⚖️ 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
21. 21.True or false: hitting a cricket ball is a push. (a) False (b) True
22. 22.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 15 N, a glass sheet 4 N, a wooden plank 8 N, a carpet 11 N. Which surface gave the least friction? (a) a glass sheet (b) a carpet (c) sandpaper (d) a wooden plank
23. 23.⚖️ A seesaw balances. Zoya (130 N) sits 3 m from the pivot on one side; Meena (390 N) sits ? m from the pivot on the other side. What is the missing distance in metres?
24. 24.⚙️ How many simple machines are there in the usual list? (a) 10 (b) 3 (c) 12 (d) 6
25. 25.⚖️ Along a straight bar, measured from the left end, the effort is at 30 cm, the fulcrum at 0 cm and the load at 70 cm. Which class of lever is it? (a) class 2 (b) class 1 (c) class 3
26. 26.🛞 More or less friction: a wet tiled floor? (a) more friction (b) less friction
27. 27.⚖️ In a class 1 lever, what is in the middle? (a) the load (b) the fulcrum (c) nothing (d) the effort
28. 28.💪 Which can a force NOT do? (a) start it moving (b) stop it moving (c) change its colour (d) change its shape
29. 29.Which of these is caused by muscular force? (a) a rolling ball slows (b) a river flows downhill (c) lifting a school bag (d) a thrown ball comes down
30. 30.🔍 Which is the odd one out? (a) a box pushed on carpet (b) a rough doormat (c) chalk on a gym bar (d) a smooth steel slide
31. 31.⚖️ A seesaw balances. Meena (? N) sits 1 m from the pivot on one side; Arjun (160 N) sits 1 m from the pivot on the other side. What is the missing weight in newtons?
32. 32.🪝 A well winch has a handle (wheel) of radius 30 cm turning an axle of radius 5 cm. What is its mechanical advantage (MA)?
33. 33.True or false: your forearm is a class 2 lever (load in the middle). (a) True (b) False
34. 34.⚖️ A seesaw balances. Ravi (110 N) sits 1 m from the pivot on one side; Kabir (? N) sits 1 m from the pivot on the other side. What is the missing weight in newtons?
35. 35.🪝 A well winch has a handle (wheel) of radius 24 cm turning an axle of radius 4 cm. What is its mechanical advantage (MA)?
36. 36.⚖️ Along a straight bar, measured from the left end, the effort is at 10 cm, the fulcrum at 60 cm and the load at 50 cm. Which class of lever is it? (a) class 1 (b) class 3 (c) class 2
37. 37.🏋️ In which unit is work measured? (a) watt hour (b) metre (m) (c) newton (N) (d) joule (J)
38. 38.⚖️ A lever bar balances. The load is ? N at 50 cm from the fulcrum. The effort is 100 N at 80 cm from the fulcrum on the other side. What is the missing force in newtons?
39. 39.True or false: a seesaw is a class 1 lever (fulcrum in the middle). (a) True (b) False
40. 40.⚖️ Which class of lever is a beam balance? (a) class 2 (b) class 3 (c) class 1

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