Engineering Worksheet: Part 2 Test

Engineering lesson 16: Part 2 test: forces and machines · Set 467 · 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.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 4 N, sandpaper 6 N, a glass sheet 1 N, a wooden plank 2 N. Which surface gave the most friction? (a) a carpet (b) a wooden plank (c) sandpaper (d) a glass sheet
2. 2.⚖️ Which class of lever is a nutcracker? (a) class 2 (b) class 3 (c) class 1
3. 3.True or false: oil on a squeaky hinge gives more friction. (a) True (b) False
4. 4.🏋️ A machine lifts a load of 120 N when you push with 40 N. What is its mechanical advantage (MA)?
5. 5.⚖️ A seesaw balances. Meena (520 N) sits 3 m from the pivot on one side; Zoya (? N) sits 4 m from the pivot on the other side. What is the missing weight in newtons?
6. 6.🏋️ In which unit is work measured? (a) metre (m) (b) joule (J) (c) watt hour (d) newton (N)
7. 7.🏋️ An 11 kg box is lifted straight up by 3 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
8. 8.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 4 N, a wooden plank 5 N, a carpet 6 N, ice 2 N. Which surface gave the most friction? (a) a carpet (b) a wooden plank (c) ice (d) a glass sheet
9. 9.🏋️ A smooth ramp is 6 m long and rises 2 m. What effort pushes a 600 N box up it, in newtons? (ideal ramp, no friction)
10. 10.⚖️ A seesaw balances. Arjun (320 N) sits ? m from the pivot on one side; Kabir (480 N) sits 2 m from the pivot on the other side. What is the missing distance in metres?
11. 11.⚖️ Along a straight bar, measured from the left end, the effort is at 40 cm, the fulcrum at 10 cm and the load at 0 cm. Which class of lever is it? (a) class 1 (b) class 2 (c) class 3
12. 12.True or false: a box pushed on carpet gives more friction. (a) False (b) True
13. 13.True or false: pressing a doorbell is a pull. (a) False (b) True
14. 14.🏋️ Mechanical advantage (MA) = … (a) load × effort (b) load + effort (c) load ÷ effort (d) effort ÷ load
15. 15.True or false: kicking a football is a push. (a) True (b) False
16. 16.🏋️ A 19 kg box is lifted straight up by 4 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
17. 17.⚖️ A lever bar balances. The load is 80 N at 20 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?
18. 18.⚖️ Along a straight bar, measured from the left end, the effort is at 80 cm, the fulcrum at 40 cm and the load at 30 cm. Which class of lever is it? (a) class 1 (b) class 2 (c) class 3
19. 19.🛞 More or less friction: a rough doormat? (a) less friction (b) more friction
20. 20.⚖️ A lever bar balances. The load is ? N at 30 cm from the fulcrum. The effort is 240 N at 30 cm from the fulcrum on the other side. What is the missing force in newtons?
21. 21.⚖️ A seesaw balances. Arjun (360 N) sits 2 m from the pivot on one side; Zoya (240 N) sits ? m from the pivot on the other side. What is the missing distance in metres?
22. 22.⚖️ A seesaw balances. Meena (400 N) sits ? m from the pivot on one side; Ravi (100 N) sits 4 m from the pivot on the other side. What is the missing distance in metres?
23. 23.Which of these is a screw? (a) a bottle cap (b) a door stopper (c) a water tap handle (d) a road up a hill
24. 24.⚖️ A lever bar balances. The load is ? N at 20 cm from the fulcrum. The effort is 160 N at 50 cm from the fulcrum on the other side. What is the missing force in newtons?
25. 25.⚖️ A lever bar balances. The load is 160 N at 20 cm from the fulcrum. The effort is ? N at 20 cm from the fulcrum on the other side. What is the missing force in newtons?
26. 26.True or false: a fixed pulley stays in one place. (a) True (b) False
27. 27.💪 Two children push a box to the right, one with 50 N and the other with 60 N. What is the net (total) force on the box, in newtons?
28. 28.Which of these is a lever? (a) a flagpole rope wheel (b) a claw hammer on a nail (c) a round doorknob (d) a crane hook block
29. 29.⚖️ A seesaw balances. Ravi (240 N) sits 4 m from the pivot on one side; Asha (? N) sits 2 m from the pivot on the other side. What is the missing weight in newtons?
30. 30.True or false: a crowbar is a class 2 lever (load in the middle). (a) True (b) False
31. 31.⚖️ A seesaw balances. Asha (190 N) sits 4 m from the pivot on one side; Arjun (760 N) sits ? m from the pivot on the other side. What is the missing distance in metres?
32. 32.True or false: a crowbar is a wedge. (a) False (b) True
33. 33.🛞 More or less friction: sand on a slippery path? (a) less friction (b) more friction
34. 34.🏋️ A force of 230 N pushes a cart 7 m along the floor. How much work is done, in joules?
35. 35.💪 Is pushing a swing a push or a pull? (a) a push (b) a pull
36. 36.🪝 A winch has a wheel of radius 20 cm and an axle of radius 4 cm. What effort on the wheel lifts a 100 N bucket on the axle, in newtons? (ideal)
37. 37.🛞 More or less friction: a smooth steel slide? (a) less friction (b) more friction
38. 38.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 14 N, a glass sheet 3 N, a wooden plank 6 N, a carpet 10 N. Which surface gave the least friction? (a) a wooden plank (b) a glass sheet (c) a carpet (d) sandpaper
39. 39.💪 Which force is at work: rain falls to the ground? (a) friction (b) gravity (c) muscular force (d) magnetic force
40. 40.🛞 How can we reduce friction in a machine? (a) add sand (b) make parts rough (c) press parts harder (d) oil the moving parts

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