Engineering Worksheet: Part 2 Test

Engineering lesson 16: Part 2 test: forces and machines · Set 517 · 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.🪝 A winch has a wheel of radius 35 cm and an axle of radius 5 cm. What effort on the wheel lifts a 1190 N bucket on the axle, in newtons? (ideal)
2. 2.🔍 Which is the odd one out? (a) a bottle opener (b) a nutcracker (c) a well-bucket rope wheel (d) a seesaw
3. 3.⚖️ Going along a lever from one end to the other, the order is: load, effort, fulcrum. Which class of lever is it? (a) class 2 (b) class 1 (c) class 3
4. 4.🏋️ A force of 370 N pushes a cart 4 m along the floor. How much work is done, in joules?
5. 5.True or false: a seesaw is a class 1 lever (fulcrum in the middle). (a) False (b) True
6. 6.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 3 N, a carpet 6 N, sandpaper 7 N, a glass sheet 1 N. Which surface gave the least friction? (a) a carpet (b) a glass sheet (c) sandpaper (d) a wooden plank
7. 7.💪 Two children push a box to the right, one with 90 N and the other with 80 N. What is the net (total) force on the box, in newtons?
8. 8.💪 Two equal forces push on a box from opposite sides. They are … (a) unbalanced (b) balanced (c) gravity (d) doubled
9. 9.🏋️ A machine lifts a load of 250 N when you push with 50 N. What is its mechanical advantage (MA)?
10. 10.⚖️ Which class of lever is a crowbar? (a) class 3 (b) class 2 (c) class 1
11. 11.💪 Is pushing a swing a push or a pull? (a) a pull (b) a push
12. 12.True or false: a lemon squeezer is a class 2 lever (load in the middle). (a) False (b) True
13. 13.💪 Is closing a drawer a push or a pull? (a) a pull (b) a push
14. 14.⚖️ A lever balances when … (a) both weights are equal (b) the bar is short (c) the fulcrum moves (d) turning effects match
15. 15.🪝 A well winch has a handle (wheel) of radius 14 cm turning an axle of radius 2 cm. What is its mechanical advantage (MA)?
16. 16.🪝 A bucket weighing 340 N is lifted with a single fixed pulley at the top of a well. What effort is needed, in newtons? (ideal pulley, no friction)
17. 17.Which of these is a pulley? (a) a bottle opener (b) a jar lid (c) the tip of a nail (d) a window blind cord
18. 18.🔍 Which is the odd one out? (a) a well-bucket rope wheel (b) a claw hammer on a nail (c) a window blind cord (d) a crane hook block
19. 19.Which of these is a wheel and axle? (a) a round doorknob (b) a nutcracker (c) a playground slide (d) a well-bucket rope wheel
20. 20.⚙️ Which simple machine is a bottle cap? (a) wedge (b) inclined plane (c) pulley (d) screw
21. 21.True or false: a well-bucket rope wheel is an inclined plane. (a) True (b) False
22. 22.🛞 More or less friction: a grippy rubber sole? (a) less friction (b) more friction
23. 23.True or false: pressing a doorbell is a pull. (a) False (b) True
24. 24.⚖️ A seesaw balances. Ravi (600 N) sits ? m from the pivot on one side; Kabir (600 N) sits 3 m from the pivot on the other side. What is the missing distance in metres?
25. 25.⚙️ Which simple machine is a chisel? (a) wedge (b) wheel and axle (c) screw (d) pulley
26. 26.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 11 N, a glass sheet 3 N, a wooden plank 6 N, a carpet 8 N. Which surface gave the least friction? (a) a carpet (b) a wooden plank (c) sandpaper (d) a glass sheet
27. 27.🏋️ Can a simple machine reduce the work done? (a) yes, always (b) no, work stays the same (c) only on Mondays (d) yes, by half
28. 28.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 6 N, sandpaper 7 N, ice 3 N, a glass sheet 5 N. Which surface gave the most friction? (a) ice (b) a glass sheet (c) a wooden plank (d) sandpaper
29. 29.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 6 N, a wooden plank 7 N, a carpet 8 N, ice 4 N. How many newtons more were needed on a carpet than on ice?
30. 30.⚖️ A seesaw balances. Zoya (600 N) sits 4 m from the pivot on one side; Asha (? N) sits 3 m from the pivot on the other side. What is the missing weight in newtons?
31. 31.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 9 N, a glass sheet 3 N, a wooden plank 4 N, a carpet 7 N. How many newtons more were needed on sandpaper than on a glass sheet?
32. 32.⚙️ Which simple machine is a door stopper? (a) wedge (b) pulley (c) lever (d) wheel and axle
33. 33.💪 Which force is at work: pedalling a cycle? (a) friction (b) gravity (c) muscular force (d) magnetic force
34. 34.⚖️ Which class of lever is a beam balance? (a) class 2 (b) class 3 (c) class 1
35. 35.⚖️ Which class of lever is a nutcracker? (a) class 2 (b) class 1 (c) class 3
36. 36.💪 Which force is at work: rain falls to the ground? (a) friction (b) gravity (c) magnetic force (d) muscular force
37. 37.💪 Two children push a box to the right, one with 35 N and the other with 25 N. What is the net (total) force on the box, in newtons?
38. 38.True or false: a wood screw is a screw. (a) True (b) False
39. 39.⚖️ A seesaw balances. Ravi (? N) sits 4 m from the pivot on one side; Meena (440 N) sits 3 m from the pivot on the other side. What is the missing weight in newtons?
40. 40.⚖️ A lever bar balances. The load is 80 N at 30 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?

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