Engineering Worksheet: Part 2 Test

Engineering lesson 16: Part 2 test: forces and machines · Set 605 · 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.🪝 Fixed or movable pulley: which one hangs on the rope loop? (a) a fixed pulley (b) a movable pulley
2. 2.🪝 A well winch has a handle (wheel) of radius 12 cm turning an axle of radius 3 cm. What is its mechanical advantage (MA)?
3. 3.🔍 Which is the odd one out? (a) a jar lid (b) a playground slide (c) a wheelchair ramp (d) a truck loading ramp
4. 4.True or false: plucking a mango is a pull. (a) True (b) False
5. 5.🛞 Which surface gives the MOST friction to a sliding block? (a) polished marble (b) ice (c) sandpaper (d) glass
6. 6.🛞 Is friction helpful or a problem here: a knot holding a rope? (a) helpful (b) a problem
7. 7.🔍 Which is the odd one out? (a) powder on a carrom board (b) skating on ice (c) a wet tiled floor (d) a tyre with deep treads
8. 8.🏋️ Pushing a crate 1 m took 260 J of work. What force was used, in newtons?
9. 9.🪝 A pulley system lifts an 80 N load with an effort of 40 N. What is its mechanical advantage (MA)?
10. 10.True or false: pushing a swing is a push. (a) False (b) True
11. 11.💪 In which unit do we measure force? (a) second (s) (b) newton (N) (c) litre (L) (d) metre (m)
12. 12.⚖️ Along a straight bar, measured from the left end, the effort is at 30 cm, the fulcrum at 50 cm and the load at 40 cm. Which class of lever is it? (a) class 3 (b) class 1 (c) class 2
13. 13.⚖️ To lift a heavy rock with a crowbar more easily, push … (a) on the fulcrum (b) far from the fulcrum (c) near the fulcrum (d) on the rock
14. 14.Which of these is a wedge? (a) a window blind cord (b) a road up a hill (c) a flagpole rope wheel (d) the tip of a nail
15. 15.True or false: plucking a mango is a push. (a) True (b) False
16. 16.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 6 N, a wooden plank 8 N, a carpet 9 N, ice 3 N. Which surface gave the most friction? (a) a carpet (b) ice (c) a glass sheet (d) a wooden plank
17. 17.⚖️ 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
18. 18.🪝 A winch has a wheel of radius 12 cm and an axle of radius 3 cm. What effort on the wheel lifts a 600 N bucket on the axle, in newtons? (ideal)
19. 19.True or false: a fixed pulley needs effort = load. (a) False (b) True
20. 20.🛞 More or less friction: a grippy rubber sole? (a) less friction (b) more friction
21. 21.💪 Which force pulls everything towards the Earth? (a) magnetism (b) gravity (c) friction (d) wind
22. 22.⚖️ A seesaw balances. Arjun (800 N) sits 1 m from the pivot on one side; Ravi (200 N) sits ? m from the pivot on the other side. What is the missing distance in metres?
23. 23.🏋️ A machine lifts a load of 240 N when you push with 40 N. What is its mechanical advantage (MA)?
24. 24.🏋️ A longer ramp to the same height needs … (a) the same effort (b) more effort (c) less effort (d) no effort
25. 25.Which of these is caused by gravity? (a) a rolling ball slows (b) a compass needle turns (c) brakes stop a bicycle (d) rain falls to the ground
26. 26.⚖️ Along a straight bar, measured from the left end, the effort is at 30 cm, the fulcrum at 60 cm and the load at 10 cm. Which class of lever is it? (a) class 1 (b) class 2 (c) class 3
27. 27.🪝 A pulley system lifts a 140 N load with an effort of 70 N. What is its mechanical advantage (MA)?
28. 28.⚖️ Which class of lever is a crowbar? (a) class 2 (b) class 3 (c) class 1
29. 29.⚖️ A seesaw balances. Kabir (320 N) sits ? m from the pivot on one side; Arjun (640 N) sits 2 m from the pivot on the other side. What is the missing distance in metres?
30. 30.🪝 A pulley system lifts a 540 N load with an effort of 270 N. What is its mechanical advantage (MA)?
31. 31.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 5 N, a carpet 6 N, sandpaper 7 N, ice 4 N. Which surface gave the least friction? (a) a wooden plank (b) sandpaper (c) ice (d) a carpet
32. 32.🛞 Is friction helpful or a problem here: walking without slipping? (a) a problem (b) helpful
33. 33.⚖️ A lever bar balances. The load is 240 N at 10 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?
34. 34.🛞 Rubbing your hands fast makes them … (a) warm (b) wet (c) cold (d) magnetic
35. 35.⚖️ A lever bar balances. The load is 420 N at ? cm from the fulcrum. The effort is 350 N at 60 cm from the fulcrum on the other side. What is the missing distance in centimetres?
36. 36.🔍 Which is the odd one out? (a) a wheelchair ramp (b) a playground slide (c) a truck loading ramp (d) a round doorknob
37. 37.🛞 More or less friction: a box pushed on carpet? (a) more friction (b) less friction
38. 38.💪 Two children push a box to the right, one with 35 N and the other with 35 N. What is the net (total) force on the box, in newtons?
39. 39.True or false: a fixed pulley makes you pull 2× rope. (a) True (b) False
40. 40.🛞 More or less friction: skating on ice? (a) more friction (b) less friction

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