Engineering Worksheet: Part 2 Test

Engineering lesson 16: Part 2 test: forces and machines · Set 271 · 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.🛞 Is friction helpful or a problem here: striking a matchstick? (a) a problem (b) helpful
2. 2.🛞 Is friction helpful or a problem here: gripping a cricket bat? (a) a problem (b) helpful
3. 3.⚖️ Along a straight bar, measured from the left end, the effort is at 70 cm, the fulcrum at 50 cm and the load at 30 cm. Which class of lever is it? (a) class 3 (b) class 1 (c) class 2
4. 4.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 9 N, ice 1 N, a wooden plank 2 N, a carpet 6 N. Which surface gave the least friction? (a) sandpaper (b) a carpet (c) a wooden plank (d) ice
5. 5.⚙️ How many simple machines are there in the usual list? (a) 10 (b) 3 (c) 12 (d) 6
6. 6.True or false: a movable pulley needs effort = load. (a) True (b) False
7. 7.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 5 N, a wooden plank 6 N, a carpet 7 N, ice 2 N. Which surface gave the least friction? (a) a carpet (b) a wooden plank (c) ice (d) a glass sheet
8. 8.Which of these is caused by magnetic force? (a) a river flows downhill (b) squeezing a lemon (c) a magnet picks up pins (d) rain falls to the ground
9. 9.🛞 More or less friction: a wheel on ball bearings? (a) more friction (b) less friction
10. 10.🪝 A pulley system lifts a 60 N load with an effort of 20 N. What is its mechanical advantage (MA)?
11. 11.💪 A bag has a mass of 58 kg. Taking 1 kg to weigh about 10 N, what is its weight in newtons?
12. 12.💪 Two children push a box to the right, one with 85 N and the other with 55 N. What is the net (total) force on the box, in newtons?
13. 13.🛞 More or less friction: a rough doormat? (a) less friction (b) more friction
14. 14.🪝 Fixed or movable pulley: which one stays in one place? (a) a movable pulley (b) a fixed pulley
15. 15.⚖️ A seesaw balances. Ravi (240 N) sits 1 m from the pivot on one side; Zoya (120 N) sits ? m from the pivot on the other side. What is the missing distance in metres?
16. 16.True or false: a fixed pulley only changes direction. (a) True (b) False
17. 17.⚖️ A seesaw balances. Arjun (180 N) sits 3 m from the pivot on one side; Ravi (? N) sits 1 m from the pivot on the other side. What is the missing weight in newtons?
18. 18.💪 Which force pulls everything towards the Earth? (a) wind (b) magnetism (c) friction (d) gravity
19. 19.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 6 N, sandpaper 10 N, ice 1 N, a glass sheet 5 N. Which surface gave the most friction? (a) ice (b) sandpaper (c) a wooden plank (d) a glass sheet
20. 20.⚖️ A lever bar balances. The load is 1000 N at 10 cm from the fulcrum. The effort is 100 N at ? cm from the fulcrum on the other side. What is the missing distance in centimetres?
21. 21.💪 Is pulling a cart a push or a pull? (a) a pull (b) a push
22. 22.⚙️ Which simple machine is a truck loading ramp? (a) wedge (b) inclined plane (c) wheel and axle (d) pulley
23. 23.💪 In which unit do we measure force? (a) metre (m) (b) second (s) (c) litre (L) (d) newton (N)
24. 24.🪝 Fixed or movable pulley: which one makes you pull 2× rope? (a) a fixed pulley (b) a movable pulley
25. 25.True or false: your forearm is a class 3 lever (effort in the middle). (a) False (b) True
26. 26.⚖️ On a seesaw, a heavier child should sit … (a) closer to the pivot (b) anywhere (c) on the pivot (d) farther from the pivot
27. 27.True or false: a crane hook block is a lever. (a) True (b) False
28. 28.⚖️ A lever bar balances. The load is 180 N at 30 cm from the fulcrum. The effort is ? N at 30 cm from the fulcrum on the other side. What is the missing force in newtons?
29. 29.🔍 Which is the odd one out? (a) powder on a carrom board (b) a tyre with deep treads (c) a grippy rubber sole (d) sand on a slippery path
30. 30.💪 Two children push a box to the right, one with 75 N and the other with 85 N. What is the net (total) force on the box, in newtons?
31. 31.⚖️ A lever balances when … (a) both weights are equal (b) the bar is short (c) the fulcrum moves (d) turning effects match
32. 32.True or false: a wet tiled floor gives less friction. (a) True (b) False
33. 33.⚖️ A seesaw balances. Asha (? N) sits 3 m from the pivot on one side; Kabir (390 N) sits 3 m from the pivot on the other side. What is the missing weight in newtons?
34. 34.⚖️ In a class 3 lever, what is in the middle? (a) the fulcrum (b) the effort (c) the load (d) the pulley
35. 35.🛞 Is friction helpful or a problem here: brakes stopping a cycle? (a) helpful (b) a problem
36. 36.True or false: a fixed pulley hangs on the rope loop. (a) True (b) False
37. 37.🏋️ A smooth ramp is 6 m long and rises 1 m. What effort pushes a 3000 N box up it, in newtons? (ideal ramp, no friction)
38. 38.Which of these is caused by friction? (a) a compass needle turns (b) rain falls to the ground (c) pedalling a cycle (d) a rolling ball slows
39. 39.🪝 Fixed or movable pulley: which one hangs on the rope loop? (a) a movable pulley (b) a fixed pulley
40. 40.⚖️ A seesaw balances. Arjun (640 N) sits ? m from the pivot on one side; Zoya (160 N) sits 4 m from the pivot on the other side. What is the missing distance in metres?

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