Engineering Worksheet: Part 2 Test

Engineering lesson 16: Part 2 test: forces and machines · Set 531 · 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.🏋️ Pushing a crate 10 m took 300 J of work. What force was used, in newtons?
2. 2.🪝 A well winch has a handle (wheel) of radius 28 cm turning an axle of radius 4 cm. What is its mechanical advantage (MA)?
3. 3.⚖️ On a seesaw, a heavier child should sit … (a) closer to the pivot (b) anywhere (c) farther from the pivot (d) on the pivot
4. 4.🏋️ Can a simple machine reduce the work done? (a) yes, always (b) only on Mondays (c) yes, by half (d) no, work stays the same
5. 5.🏋️ Pushing a crate 1 m took 280 J of work. What force was used, in newtons?
6. 6.⚖️ A seesaw balances. Asha (330 N) sits ? m from the pivot on one side; Kabir (330 N) sits 3 m from the pivot on the other side. What is the missing distance in metres?
7. 7.True or false: a lemon squeezer is a class 1 lever (fulcrum in the middle). (a) False (b) True
8. 8.🪝 A load of 60 N hangs from a pulley system in which 3 rope sections hold up the load. What effort is needed, in newtons? (ideal pulleys)
9. 9.⚖️ To lift a heavy rock with a crowbar more easily, push … (a) on the fulcrum (b) near the fulcrum (c) on the rock (d) far from the fulcrum
10. 10.⚖️ Along a straight bar, measured from the left end, the effort is at 30 cm, the fulcrum at 70 cm and the load at 40 cm. Which class of lever is it? (a) class 1 (b) class 3 (c) class 2
11. 11.🏋️ In which unit is work measured? (a) newton (N) (b) metre (m) (c) joule (J) (d) watt hour
12. 12.True or false: pulling up your socks is a push. (a) True (b) False
13. 13.🛞 Is friction helpful or a problem here: gripping a cricket bat? (a) a problem (b) helpful
14. 14.⚖️ A seesaw balances. Arjun (450 N) sits 4 m from the pivot on one side; Meena (? N) sits 3 m from the pivot on the other side. What is the missing weight in newtons?
15. 15.🪝 A pulley system has 4 rope sections holding up the load. To lift the load by 9 m, how many metres of rope must you pull?
16. 16.🏋️ A longer ramp to the same height needs … (a) more effort (b) no effort (c) the same effort (d) less effort
17. 17.🏋️ A 6 kg box is lifted straight up by 5 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
18. 18.True or false: drawing up a well bucket is a pull. (a) False (b) True
19. 19.🛞 More or less friction: a tyre with deep treads? (a) less friction (b) more friction
20. 20.🛞 Is friction helpful or a problem here: tyres wearing down? (a) helpful (b) a problem
21. 21.🛞 Is friction helpful or a problem here: brakes stopping a cycle? (a) a problem (b) helpful
22. 22.True or false: a movable pulley rises with the load. (a) True (b) False
23. 23.🛞 Friction acts … (a) with the motion (b) only upwards (c) only on ice (d) against the motion
24. 24.🏋️ A machine lifts a load of 80 N when you push with 40 N. What is its mechanical advantage (MA)?
25. 25.🏋️ A machine lifts a load of 120 N when you push with 30 N. What is its mechanical advantage (MA)?
26. 26.⚙️ How many simple machines are there in the usual list? (a) 6 (b) 10 (c) 3 (d) 12
27. 27.⚖️ A lever bar balances. The load is 420 N at ? cm from the fulcrum. The effort is 240 N at 70 cm from the fulcrum on the other side. What is the missing distance in centimetres?
28. 28.🛞 Is friction helpful or a problem here: a door hinge squeaking? (a) helpful (b) a problem
29. 29.💪 A cart is pulled to the right with 35 N and to the left with 45 N. Which way does the net force act? (a) to the left (b) to the right (c) no net force
30. 30.🏋️ Pushing a crate 1 m took 70 J of work. What force was used, in newtons?
31. 31.💪 Which force is at work: rain falls to the ground? (a) magnetic force (b) gravity (c) friction (d) muscular force
32. 32.⚖️ Turning effect = force × … (a) time taken (b) colour of bar (c) distance from fulcrum (d) mass of fulcrum
33. 33.Which of these is an inclined plane? (a) a water tap handle (b) a round doorknob (c) a bottle opener (d) a wheelchair ramp
34. 34.🔍 Which is the odd one out? (a) a rough doormat (b) skating on ice (c) a box pushed on carpet (d) a grippy rubber sole
35. 35.Which of these is a pulley? (a) a flagpole rope wheel (b) a wood screw (c) a bottle opener (d) a round doorknob
36. 36.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 1 N, a glass sheet 2 N, a wooden plank 6 N, a carpet 8 N. Which surface gave the least friction? (a) ice (b) a wooden plank (c) a carpet (d) a glass sheet
37. 37.⚙️ Most simple machines make work easier by letting us … (a) stop all friction (b) make new energy (c) use a smaller force (d) switch off gravity
38. 38.💪 Two children push a box to the right, one with 75 N and the other with 50 N. What is the net (total) force on the box, in newtons?
39. 39.Which of these is a pulley? (a) a steering wheel (b) the tip of a nail (c) a window blind cord (d) a bottle opener
40. 40.🏋️ A machine lifts a load of 390 N when you push with 130 N. What is its mechanical advantage (MA)?

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