Engineering Worksheet: Part 2 Test

Engineering lesson 16: Part 2 test: forces and machines · Set 638 · 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.⚖️ Which class of lever is a nutcracker? (a) class 1 (b) class 2 (c) class 3
2. 2.⚙️ Most simple machines make work easier by letting us … (a) switch off gravity (b) use a smaller force (c) stop all friction (d) make new energy
3. 3.True or false: drawing up a well bucket is a pull. (a) False (b) True
4. 4.🏋️ Pushing a crate 9 m took 4140 J of work. What force was used, in newtons?
5. 5.🪝 A pulley system has 1 rope section holding up the load. To lift the load by 6 m, how many metres of rope must you pull?
6. 6.🛞 More or less friction: a wet tiled floor? (a) less friction (b) more friction
7. 7.💪 Is opening a drawer a push or a pull? (a) a pull (b) a push
8. 8.🪝 Fixed or movable pulley: which one hangs on the rope loop? (a) a movable pulley (b) a fixed pulley
9. 9.⚖️ Going along a lever from one end to the other, the order is: fulcrum, effort, load. Which class of lever is it? (a) class 2 (b) class 3 (c) class 1
10. 10.🪝 What does a single fixed pulley change? (a) the colour of rope (b) the direction of pull (c) the size of the load (d) gravity
11. 11.⚖️ A lever balances when … (a) turning effects match (b) the bar is short (c) both weights are equal (d) the fulcrum moves
12. 12.True or false: pushing a swing is a push. (a) False (b) True
13. 13.🪝 Fixed or movable pulley: which one makes you pull 2× rope? (a) a fixed pulley (b) a movable pulley
14. 14.True or false: a fishing rod is a class 1 lever (fulcrum in the middle). (a) False (b) True
15. 15.🪝 A bucket weighing 120 N is lifted with a single fixed pulley at the top of a well. What effort is needed, in newtons? (ideal pulley, no friction)
16. 16.💪 In which unit do we measure force? (a) second (s) (b) metre (m) (c) newton (N) (d) litre (L)
17. 17.⚖️ A seesaw balances. Asha (300 N) sits 3 m from the pivot on one side; Ravi (? N) sits 3 m from the pivot on the other side. What is the missing weight in newtons?
18. 18.💪 Two children push a box to the right, one with 5 N and the other with 20 N. What is the net (total) force on the box, in newtons?
19. 19.⚖️ A seesaw balances. Kabir (? N) sits 1 m from the pivot on one side; Ravi (110 N) sits 3 m from the pivot on the other side. What is the missing weight in newtons?
20. 20.🛞 Rubbing your hands fast makes them … (a) warm (b) cold (c) magnetic (d) wet
21. 21.True or false: a bottle opener is a screw. (a) True (b) False
22. 22.💪 Which can a force NOT do? (a) stop it moving (b) start it moving (c) change its shape (d) change its colour
23. 23.True or false: a grippy rubber sole gives less friction. (a) True (b) False
24. 24.💪 A box weighs 130 N. Taking 1 kg to weigh about 10 N, what is its mass in kilograms?
25. 25.💪 Is kicking a football a push or a pull? (a) a pull (b) a push
26. 26.⚖️ A seesaw balances. Kabir (450 N) sits 1 m from the pivot on one side; Arjun (150 N) sits ? m from the pivot on the other side. What is the missing distance in metres?
27. 27.⚖️ Which class of lever is a beam balance? (a) class 1 (b) class 3 (c) class 2
28. 28.True or false: a movable pulley needs effort = load. (a) False (b) True
29. 29.⚖️ Going along a lever from one end to the other, the order is: load, fulcrum, effort. Which class of lever is it? (a) class 3 (b) class 1 (c) class 2
30. 30.🛞 More or less friction: chalk on a gym bar? (a) more friction (b) less friction
31. 31.🛞 Which surface gives the MOST friction to a sliding block? (a) glass (b) ice (c) sandpaper (d) polished marble
32. 32.🔍 Which is the odd one out? (a) a rough doormat (b) powder on a carrom board (c) oil on a squeaky hinge (d) a wheel on ball bearings
33. 33.⚖️ A lever bar balances. The load is ? N at 30 cm from the fulcrum. The effort is 240 N at 60 cm from the fulcrum on the other side. What is the missing force in newtons?
34. 34.True or false: pulling up your socks is a pull. (a) False (b) True
35. 35.🪝 A wheel and axle is a big wheel fixed to … (a) a loose rope (b) a flat ramp (c) a sharp wedge (d) a smaller rod (axle)
36. 36.💪 Two children push a box to the right, one with 40 N and the other with 5 N. What is the net (total) force on the box, in newtons?
37. 37.🏋️ An 18 kg box is lifted straight up by 2 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
38. 38.⚖️ A seesaw balances. Zoya (110 N) sits ? m from the pivot on one side; Asha (330 N) sits 1 m from the pivot on the other side. What is the missing distance in metres?
39. 39.🪝 Fixed or movable pulley: which one only changes direction? (a) a movable pulley (b) a fixed pulley
40. 40.⚖️ Along a straight bar, measured from the left end, the effort is at 20 cm, the fulcrum at 10 cm and the load at 50 cm. Which class of lever is it? (a) class 1 (b) class 2 (c) class 3

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