Engineering Worksheet: Part 2 Test

Engineering lesson 16: Part 2 test: forces and machines · Set 320 · 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.⚙️ Most simple machines make work easier by letting us … (a) switch off gravity (b) make new energy (c) stop all friction (d) use a smaller force
2. 2.🪝 A winch has a wheel of radius 6 cm and an axle of radius 1 cm. What effort on the wheel lifts a 960 N bucket on the axle, in newtons? (ideal)
3. 3.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 2 N, a wooden plank 5 N, a carpet 8 N, sandpaper 10 N. How many newtons more were needed on sandpaper than on a glass sheet?
4. 4.⚖️ Going along a lever from one end to the other, the order is: effort, load, fulcrum. Which class of lever is it? (a) class 3 (b) class 2 (c) class 1
5. 5.⚖️ Along a straight bar, measured from the left end, the effort is at 30 cm, the fulcrum at 10 cm and the load at 40 cm. Which class of lever is it? (a) class 2 (b) class 1 (c) class 3
6. 6.True or false: a nutcracker is a class 2 lever (load in the middle). (a) False (b) True
7. 7.🏋️ Pushing a crate 3 m took 300 J of work. What force was used, in newtons?
8. 8.🔍 Which is the odd one out? (a) a crowbar (b) a nutcracker (c) a well-bucket rope wheel (d) a seesaw
9. 9.True or false: a pair of tweezers is a class 1 lever (fulcrum in the middle). (a) True (b) False
10. 10.True or false: plucking a mango is a push. (a) True (b) False
11. 11.True or false: a movable pulley needs effort = load. (a) True (b) False
12. 12.True or false: a fixed pulley only changes direction. (a) False (b) True
13. 13.🛞 Is friction helpful or a problem here: walking without slipping? (a) helpful (b) a problem
14. 14.🏋️ An 11 kg box is lifted straight up by 1 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
15. 15.Which of these is an inclined plane? (a) a nut and bolt (b) a road up a hill (c) a well-bucket rope wheel (d) a screw jack
16. 16.⚖️ A seesaw balances. Arjun (510 N) sits 2 m from the pivot on one side; Meena (? N) sits 3 m from the pivot on the other side. What is the missing weight in newtons?
17. 17.True or false: a pair of scissors is a class 1 lever (fulcrum in the middle). (a) True (b) False
18. 18.🪝 A wheel and axle is a big wheel fixed to … (a) a smaller rod (axle) (b) a loose rope (c) a flat ramp (d) a sharp wedge
19. 19.⚖️ Turning effect = force × … (a) mass of fulcrum (b) time taken (c) colour of bar (d) distance from fulcrum
20. 20.True or false: pressing a doorbell is a push. (a) True (b) False
21. 21.Which of these is a screw? (a) a bottle opener (b) a claw hammer on a nail (c) a well winch handle (d) a nut and bolt
22. 22.⚖️ A seesaw balances. Meena (300 N) sits 4 m from the pivot on one side; Arjun (? N) sits 2 m from the pivot on the other side. What is the missing weight in newtons?
23. 23.🔍 Which is the odd one out? (a) skating on ice (b) powder on a carrom board (c) a grippy rubber sole (d) a smooth steel slide
24. 24.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 2 N, a glass sheet 6 N, a wooden plank 8 N, sandpaper 9 N. Which surface gave the least friction? (a) sandpaper (b) a wooden plank (c) ice (d) a glass sheet
25. 25.True or false: a crowbar is a class 2 lever (load in the middle). (a) False (b) True
26. 26.⚖️ Going along a lever from one end to the other, the order is: load, effort, fulcrum. Which class of lever is it? (a) class 1 (b) class 3 (c) class 2
27. 27.True or false: a fixed pulley stays in one place. (a) False (b) True
28. 28.💪 Two children push a box to the right, one with 30 N and the other with 35 N. What is the net (total) force on the box, in newtons?
29. 29.Which of these is a wheel and axle? (a) a well winch handle (b) a crane hook block (c) a jar lid (d) a seesaw
30. 30.Which of these is a lever? (a) a nut and bolt (b) a bottle opener (c) a crane hook block (d) a screw jack
31. 31.🏋️ Pushing a crate 3 m took 1410 J of work. What force was used, in newtons?
32. 32.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 7 N, sandpaper 9 N, ice 2 N, a glass sheet 3 N. How many newtons more were needed on sandpaper than on ice?
33. 33.True or false: a nut and bolt is a wheel and axle. (a) True (b) False
34. 34.🏋️ A machine lifts a load of 240 N when you push with 60 N. What is its mechanical advantage (MA)?
35. 35.⚖️ A lever bar balances. The load is 490 N at 50 cm from the fulcrum. The effort is 350 N at ? cm from the fulcrum on the other side. What is the missing distance in centimetres?
36. 36.⚖️ Which class of lever is a pair of pliers? (a) class 1 (b) class 3 (c) class 2
37. 37.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 1 N, a wooden plank 5 N, a carpet 8 N, sandpaper 10 N. Which surface gave the least friction? (a) a carpet (b) sandpaper (c) a wooden plank (d) a glass sheet
38. 38.⚖️ On a seesaw, a heavier child should sit … (a) farther from the pivot (b) on the pivot (c) anywhere (d) closer to the pivot
39. 39.🛞 Is friction helpful or a problem here: a knot holding a rope? (a) a problem (b) helpful
40. 40.⚖️ Along a straight bar, measured from the left end, the effort is at 30 cm, the fulcrum at 60 cm and the load at 100 cm. Which class of lever is it? (a) class 3 (b) class 1 (c) class 2

Free engineering lessons, practice and worksheets at talentjr.in/engineering-for-kids