Engineering Worksheet: Part 2 Test

Engineering lesson 16: Part 2 test: forces and machines · Set 255 · 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.⚖️ In a class 1 lever, what is in the middle? (a) the load (b) the effort (c) the fulcrum (d) nothing
2. 2.True or false: pressing a doorbell is a pull. (a) False (b) True
3. 3.⚖️ A seesaw balances. Arjun (? N) sits 3 m from the pivot on one side; Kabir (570 N) sits 2 m from the pivot on the other side. What is the missing weight in newtons?
4. 4.True or false: plucking a mango is a push. (a) False (b) True
5. 5.🪝 A bucket weighing 40 N is lifted with a single fixed pulley at the top of a well. What effort is needed, in newtons? (ideal pulley, no friction)
6. 6.Which of these is a wedge? (a) a crowbar (b) a screw jack (c) a chisel (d) a flagpole rope wheel
7. 7.🏋️ A force of 50 N pushes a cart 9 m along the floor. How much work is done, in joules?
8. 8.🪝 A well winch has a handle (wheel) of radius 10 cm turning an axle of radius 2 cm. What is its mechanical advantage (MA)?
9. 9.💪 Which can a force NOT do? (a) change its shape (b) start it moving (c) change its colour (d) stop it moving
10. 10.💪 A bag has a mass of 13 kg. Taking 1 kg to weigh about 10 N, what is its weight in newtons?
11. 11.🛞 Friction acts … (a) with the motion (b) only upwards (c) only on ice (d) against the motion
12. 12.🔍 Which is the odd one out? (a) sand on a slippery path (b) powder on a carrom board (c) skating on ice (d) oil on a squeaky hinge
13. 13.🔍 Which is the odd one out? (a) a seesaw (b) a bottle cap (c) a screw jack (d) a jar lid
14. 14.True or false: pressing a doorbell is a push. (a) False (b) True
15. 15.⚖️ A lever bar balances. The load is 280 N at ? cm from the fulcrum. The effort is 80 N at 70 cm from the fulcrum on the other side. What is the missing distance in centimetres?
16. 16.💪 A box weighs 70 N. Taking 1 kg to weigh about 10 N, what is its mass in kilograms?
17. 17.💪 Two equal forces push on a box from opposite sides. They are … (a) gravity (b) doubled (c) balanced (d) unbalanced
18. 18.🛞 Rubbing your hands fast makes them … (a) warm (b) cold (c) magnetic (d) wet
19. 19.⚖️ Turning effect = force × … (a) distance from fulcrum (b) mass of fulcrum (c) time taken (d) colour of bar
20. 20.⚖️ Along a straight bar, measured from the left end, the effort is at 70 cm, the fulcrum at 30 cm and the load at 80 cm. Which class of lever is it? (a) class 1 (b) class 3 (c) class 2
21. 21.⚖️ 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
22. 22.True or false: a smooth steel slide gives less friction. (a) False (b) True
23. 23.💪 Is drawing up a well bucket a push or a pull? (a) a pull (b) a push
24. 24.Which of these is a pulley? (a) a truck loading ramp (b) a window blind cord (c) a steering wheel (d) a crowbar
25. 25.⚙️ Most simple machines make work easier by letting us … (a) use a smaller force (b) stop all friction (c) make new energy (d) switch off gravity
26. 26.🏋️ A 6 kg box is lifted straight up by 3 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
27. 27.🛞 More or less friction: a rough doormat? (a) less friction (b) more friction
28. 28.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 8 N, a carpet 11 N, ice 1 N, a glass sheet 5 N. Which surface gave the most friction? (a) a glass sheet (b) ice (c) a wooden plank (d) a carpet
29. 29.🏋️ A 7 kg box is lifted straight up by 3 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
30. 30.🪝 A pulley system has 1 rope section holding up the load. To lift the load by 2 m, how many metres of rope must you pull?
31. 31.🪝 A bucket weighing 80 N is lifted with a single fixed pulley at the top of a well. What effort is needed, in newtons? (ideal pulley, no friction)
32. 32.True or false: a wheel on ball bearings gives more friction. (a) False (b) True
33. 33.🏋️ A smooth ramp is 3 m long and rises 1 m. What effort pushes a 2250 N box up it, in newtons? (ideal ramp, no friction)
34. 34.True or false: a fixed pulley halves the effort. (a) True (b) False
35. 35.🛞 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 9 N, sandpaper 11 N. Which surface gave the least friction? (a) sandpaper (b) a wooden plank (c) ice (d) a glass sheet
36. 36.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 8 N, sandpaper 9 N, ice 4 N, a glass sheet 5 N. Which surface gave the least friction? (a) a glass sheet (b) ice (c) a carpet (d) sandpaper
37. 37.⚖️ A lever bar balances. The load is ? N at 20 cm from the fulcrum. The effort is 100 N at 50 cm from the fulcrum on the other side. What is the missing force in newtons?
38. 38.🔍 Which is the odd one out? (a) skating on ice (b) a wheel on ball bearings (c) a wet tiled floor (d) a tyre with deep treads
39. 39.⚙️ A screw is really … (a) a kind of wheel (b) a ramp wrapped round (c) a tiny pulley (d) a bent lever
40. 40.⚖️ A seesaw balances. Arjun (520 N) sits ? m from the pivot on one side; Zoya (260 N) sits 4 m from the pivot on the other side. What is the missing distance in metres?

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