Engineering Worksheet: Part 2 Test

Engineering lesson 16: Part 2 test: forces and machines · Set 433 · 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.True or false: a pair of scissors is a class 1 lever (fulcrum in the middle). (a) False (b) True
2. 2.💪 Which force is at work: a river flows downhill? (a) gravity (b) muscular force (c) magnetic force (d) friction
3. 3.True or false: a beam balance is a class 3 lever (effort in the middle). (a) False (b) True
4. 4.True or false: a crane hook block is a wedge. (a) True (b) False
5. 5.⚖️ Which class of lever is a pair of tweezers? (a) class 1 (b) class 2 (c) class 3
6. 6.🏋️ A force of 250 N pushes a cart 1 m along the floor. How much work is done, in joules?
7. 7.🏋️ Mechanical advantage (MA) = … (a) effort ÷ load (b) load + effort (c) load ÷ effort (d) load × effort
8. 8.⚖️ On a seesaw, a heavier child should sit … (a) on the pivot (b) farther from the pivot (c) anywhere (d) closer to the pivot
9. 9.⚙️ Which simple machine is a water tap handle? (a) wheel and axle (b) pulley (c) inclined plane (d) lever
10. 10.Which of these is caused by friction? (a) shoes grip the floor (b) an apple falls down (c) a thrown ball comes down (d) pedalling a cycle
11. 11.🪝 Fixed or movable pulley: which one stays in one place? (a) a movable pulley (b) a fixed pulley
12. 12.⚖️ Along a straight bar, measured from the left end, the effort is at 10 cm, the fulcrum at 30 cm and the load at 60 cm. Which class of lever is it? (a) class 1 (b) class 3 (c) class 2
13. 13.🏋️ A force of 280 N pushes a cart 5 m along the floor. How much work is done, in joules?
14. 14.Which of these is a pulley? (a) a crane hook block (b) a nut and bolt (c) a wheelchair ramp (d) the tip of a nail
15. 15.True or false: a wheelbarrow is a class 3 lever (effort in the middle). (a) False (b) True
16. 16.🏋️ In which unit is work measured? (a) metre (m) (b) watt hour (c) joule (J) (d) newton (N)
17. 17.True or false: a pair of tweezers is a class 2 lever (load in the middle). (a) True (b) False
18. 18.🛞 Is friction helpful or a problem here: tyres wearing down? (a) a problem (b) helpful
19. 19.True or false: a fixed pulley only changes direction. (a) True (b) False
20. 20.True or false: a tug of war is a pull. (a) True (b) False
21. 21.⚖️ A lever bar balances. The load is ? N at 40 cm from the fulcrum. The effort is 80 N at 30 cm from the fulcrum on the other side. What is the missing force in newtons?
22. 22.💪 A cart is pulled to the right with 65 N and to the left with 80 N. Which way does the net force act? (a) to the right (b) no net force (c) to the left
23. 23.🛞 More or less friction: a rough doormat? (a) less friction (b) more friction
24. 24.⚖️ Along a straight bar, measured from the left end, the effort is at 60 cm, the fulcrum at 40 cm and the load at 30 cm. Which class of lever is it? (a) class 1 (b) class 3 (c) class 2
25. 25.🛞 Is friction helpful or a problem here: a door hinge squeaking? (a) helpful (b) a problem
26. 26.⚖️ Along a straight bar, measured from the left end, the effort is at 90 cm, the fulcrum at 30 cm and the load at 50 cm. Which class of lever is it? (a) class 2 (b) class 3 (c) class 1
27. 27.Which of these is a screw? (a) a chisel (b) a nut and bolt (c) the tip of a nail (d) a bottle opener
28. 28.⚖️ Along a straight bar, measured from the left end, the effort is at 10 cm, the fulcrum at 70 cm and the load at 40 cm. Which class of lever is it? (a) class 1 (b) class 2 (c) class 3
29. 29.⚖️ A seesaw balances. Ravi (360 N) sits 2 m from the pivot on one side; Arjun (? N) sits 3 m from the pivot on the other side. What is the missing weight in newtons?
30. 30.🏋️ A smooth ramp is 4 m long and rises 2 m. What effort pushes a 600 N box up it, in newtons? (ideal ramp, no friction)
31. 31.⚖️ A seesaw balances. Asha (? N) sits 3 m from the pivot on one side; Zoya (510 N) sits 3 m from the pivot on the other side. What is the missing weight in newtons?
32. 32.True or false: a pair of pliers is a class 2 lever (load in the middle). (a) True (b) False
33. 33.🏋️ A longer ramp to the same height needs … (a) more effort (b) less effort (c) the same effort (d) no effort
34. 34.⚖️ Along a straight bar, measured from the left end, the effort is at 40 cm, the fulcrum at 80 cm and the load at 0 cm. Which class of lever is it? (a) class 2 (b) class 1 (c) class 3
35. 35.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 11 N, ice 2 N, a glass sheet 5 N, a wooden plank 9 N. Which surface gave the least friction? (a) a glass sheet (b) ice (c) a carpet (d) a wooden plank
36. 36.💪 Is pressing a doorbell a push or a pull? (a) a push (b) a pull
37. 37.True or false: pressing a doorbell is a pull. (a) True (b) False
38. 38.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 4 N, a glass sheet 7 N, a wooden plank 8 N, sandpaper 11 N. Which surface gave the most friction? (a) ice (b) a glass sheet (c) a wooden plank (d) sandpaper
39. 39.⚖️ A seesaw balances. Kabir (360 N) sits ? m from the pivot on one side; Zoya (180 N) sits 2 m from the pivot on the other side. What is the missing distance in metres?
40. 40.True or false: a fishing rod is a class 2 lever (load in the middle). (a) False (b) True

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