Engineering Worksheet: Part 2 Test

Engineering lesson 16: Part 2 test: forces and machines · Set 753 · 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 seesaw balances. Asha (? N) sits 1 m from the pivot on one side; Meena (120 N) sits 1 m from the pivot on the other side. What is the missing weight in newtons?
2. 2.💪 A box weighs 330 N. Taking 1 kg to weigh about 10 N, what is its mass in kilograms?
3. 3.⚖️ A seesaw balances. Kabir (? N) sits 2 m from the pivot on one side; Arjun (200 N) sits 4 m from the pivot on the other side. What is the missing weight in newtons?
4. 4.🛞 More or less friction: skating on ice? (a) less friction (b) more friction
5. 5.True or false: a window blind cord is a pulley. (a) False (b) True
6. 6.⚖️ A seesaw balances. Kabir (440 N) sits 2 m from the pivot on one side; Arjun (? N) sits 4 m from the pivot on the other side. What is the missing weight in newtons?
7. 7.🛞 Rubbing your hands fast makes them … (a) cold (b) wet (c) warm (d) magnetic
8. 8.🪝 A well winch has a handle (wheel) of radius 30 cm turning an axle of radius 5 cm. What is its mechanical advantage (MA)?
9. 9.Which of these is a screw? (a) a bottle cap (b) a truck loading ramp (c) an axe blade (d) a flagpole rope wheel
10. 10.True or false: a wheelchair ramp is a wedge. (a) True (b) False
11. 11.🛞 More or less friction: sand on a slippery path? (a) more friction (b) less friction
12. 12.🪝 A load of 100 N hangs from a pulley system in which 2 rope sections hold up the load. What effort is needed, in newtons? (ideal pulleys)
13. 13.True or false: a smooth steel slide gives more friction. (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 1 (b) class 2 (c) class 3
15. 15.⚖️ Along a straight bar, measured from the left end, the effort is at 90 cm, the fulcrum at 60 cm and the load at 30 cm. Which class of lever is it? (a) class 2 (b) class 3 (c) class 1
16. 16.True or false: plucking a mango is a pull. (a) False (b) True
17. 17.True or false: a crowbar is a class 2 lever (load in the middle). (a) True (b) False
18. 18.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 1 N, a glass sheet 3 N, a wooden plank 4 N, sandpaper 5 N. Which surface gave the least friction? (a) a glass sheet (b) a wooden plank (c) ice (d) sandpaper
19. 19.⚖️ Along a straight bar, measured from the left end, the effort is at 70 cm, the fulcrum at 30 cm and the load at 20 cm. Which class of lever is it? (a) class 2 (b) class 3 (c) class 1
20. 20.🛞 More or less friction: a tyre with deep treads? (a) more friction (b) less friction
21. 21.🪝 A pulley system lifts a 720 N load with an effort of 180 N. What is its mechanical advantage (MA)?
22. 22.⚖️ A lever bar balances. The load is 400 N at 40 cm from the fulcrum. The effort is 200 N at ? cm from the fulcrum on the other side. What is the missing distance in centimetres?
23. 23.🔍 Which is the odd one out? (a) a crowbar (b) a door stopper (c) a bottle opener (d) a claw hammer on a nail
24. 24.🏋️ A smooth ramp is 4 m long and rises 2 m. What effort pushes a 1600 N box up it, in newtons? (ideal ramp, no friction)
25. 25.🛞 Is friction helpful or a problem here: walking without slipping? (a) a problem (b) helpful
26. 26.💪 A bag has a mass of 38 kg. Taking 1 kg to weigh about 10 N, what is its weight in newtons?
27. 27.⚖️ A seesaw balances. Kabir (330 N) sits 1 m from the pivot on one side; Arjun (110 N) sits ? m from the pivot on the other side. What is the missing distance in metres?
28. 28.⚙️ Which simple machine is a steering wheel? (a) inclined plane (b) screw (c) wheel and axle (d) wedge
29. 29.💪 Is opening a drawer a push or a pull? (a) a push (b) a pull
30. 30.⚖️ Along a straight bar, measured from the left end, the effort is at 40 cm, the fulcrum at 30 cm and the load at 0 cm. Which class of lever is it? (a) class 2 (b) class 1 (c) class 3
31. 31.True or false: a box pushed on carpet gives less friction. (a) True (b) False
32. 32.🏋️ Pushing a crate 1 m took 430 J of work. What force was used, in newtons?
33. 33.🏋️ A smooth ramp is 18 m long and rises 3 m. What effort pushes a 5400 N box up it, in newtons? (ideal ramp, no friction)
34. 34.🏋️ A 14 kg box is lifted straight up by 1 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
35. 35.⚖️ Along a straight bar, measured from the left end, the effort is at 20 cm, the fulcrum at 40 cm and the load at 60 cm. Which class of lever is it? (a) class 2 (b) class 3 (c) class 1
36. 36.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 10 N, a glass sheet 1 N, a wooden plank 4 N, a carpet 7 N. Which surface gave the most friction? (a) sandpaper (b) a glass sheet (c) a carpet (d) a wooden plank
37. 37.🔍 Which is the odd one out? (a) a crowbar (b) a crane hook block (c) a window blind cord (d) a flagpole rope wheel
38. 38.True or false: a pair of kitchen tongs is a class 1 lever (fulcrum in the middle). (a) False (b) True
39. 39.🪝 A winch has a wheel of radius 8 cm and an axle of radius 1 cm. What effort on the wheel lifts an 800 N bucket on the axle, in newtons? (ideal)
40. 40.⚖️ Which class of lever is a seesaw? (a) class 2 (b) class 3 (c) class 1

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