Engineering Worksheet: Part 2 Test

Engineering lesson 16: Part 2 test: forces and machines · Set 93 · 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.🪝 A bucket weighing 260 N is lifted with a single fixed pulley at the top of a well. What effort is needed, in newtons? (ideal pulley, no friction)
2. 2.True or false: a seesaw is a class 3 lever (effort in the middle). (a) False (b) True
3. 3.🏋️ Pushing a crate 6 m took 1380 J of work. What force was used, in newtons?
4. 4.True or false: opening a drawer is a push. (a) True (b) False
5. 5.🏋️ In which unit is work measured? (a) metre (m) (b) watt hour (c) joule (J) (d) newton (N)
6. 6.⚖️ A seesaw balances. Kabir (390 N) sits 2 m from the pivot on one side; Zoya (? N) sits 3 m from the pivot on the other side. What is the missing weight in newtons?
7. 7.🏋️ Work is done when a force moves something … (a) without moving it (b) only upwards (c) very slowly (d) through a distance
8. 8.⚖️ A lever bar balances. The load is 120 N at 20 cm from the fulcrum. The effort is 80 N at ? cm from the fulcrum on the other side. What is the missing distance in centimetres?
9. 9.True or false: a fixed pulley stays in one place. (a) True (b) False
10. 10.⚖️ A lever bar balances. The load is 630 N at 10 cm from the fulcrum. The effort is ? N at 90 cm from the fulcrum on the other side. What is the missing force in newtons?
11. 11.🏋️ Can a simple machine reduce the work done? (a) no, work stays the same (b) only on Mondays (c) yes, always (d) yes, by half
12. 12.Which of these is a pulley? (a) a window blind cord (b) a road up a hill (c) a nutcracker (d) the tip of a nail
13. 13.💪 Two equal forces push on a box from opposite sides. They are … (a) doubled (b) balanced (c) gravity (d) unbalanced
14. 14.🛞 More or less friction: a wheel on ball bearings? (a) more friction (b) less friction
15. 15.🏋️ A machine lifts a load of 780 N when you push with 130 N. What is its mechanical advantage (MA)?
16. 16.🏋️ A smooth ramp is 18 m long and rises 3 m. What effort pushes a 1800 N box up it, in newtons? (ideal ramp, no friction)
17. 17.🪝 A load of 150 N hangs from a pulley system in which 3 rope sections hold up the load. What effort is needed, in newtons? (ideal pulleys)
18. 18.🔍 Which is the odd one out? (a) a grippy rubber sole (b) skating on ice (c) a rough doormat (d) a box pushed on carpet
19. 19.⚖️ Going along a lever from one end to the other, the order is: effort, fulcrum, load. Which class of lever is it? (a) class 2 (b) class 3 (c) class 1
20. 20.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 3 N, a glass sheet 7 N, a wooden plank 8 N, a carpet 11 N. Which surface gave the most friction? (a) a carpet (b) ice (c) a wooden plank (d) a glass sheet
21. 21.⚙️ How many simple machines are there in the usual list? (a) 10 (b) 6 (c) 12 (d) 3
22. 22.⚖️ A lever bar balances. The load is 120 N at 20 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?
23. 23.🪝 A load of 360 N hangs from a pulley system in which 2 rope sections hold up the load. What effort is needed, in newtons? (ideal pulleys)
24. 24.Which of these is a wedge? (a) a seesaw (b) a steering wheel (c) a well-bucket rope wheel (d) an axe blade
25. 25.⚙️ Which simple machine is a knife edge? (a) wheel and axle (b) inclined plane (c) wedge (d) screw
26. 26.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 3 N, a wooden plank 6 N, a carpet 8 N, sandpaper 10 N. How many newtons more were needed on sandpaper than on ice?
27. 27.🛞 Which surface gives the MOST friction to a sliding block? (a) polished marble (b) glass (c) sandpaper (d) ice
28. 28.True or false: a bottle cap is a wheel and axle. (a) False (b) True
29. 29.🏋️ An 11 kg box is lifted straight up by 5 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
30. 30.⚖️ A lever bar balances. The load is 560 N at ? cm from the fulcrum. The effort is 400 N at 70 cm from the fulcrum on the other side. What is the missing distance in centimetres?
31. 31.⚖️ A lever bar balances. The load is 320 N at ? cm from the fulcrum. The effort is 160 N at 80 cm from the fulcrum on the other side. What is the missing distance in centimetres?
32. 32.💪 A bag has a mass of 45 kg. Taking 1 kg to weigh about 10 N, what is its weight in newtons?
33. 33.⚖️ Along a straight bar, measured from the left end, the effort is at 40 cm, the fulcrum at 70 cm and the load at 30 cm. Which class of lever is it? (a) class 1 (b) class 2 (c) class 3
34. 34.⚖️ A lever bar balances. The load is 60 N at 50 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?
35. 35.🏋️ A force of 230 N did 230 J of work. How many metres did the object move?
36. 36.True or false: a wet tiled floor gives more friction. (a) True (b) False
37. 37.💪 Which force is at work: lifting a school bag? (a) friction (b) gravity (c) magnetic force (d) muscular force
38. 38.⚖️ Going along a lever from one end to the other, the order is: load, fulcrum, effort. Which class of lever is it? (a) class 2 (b) class 1 (c) class 3
39. 39.💪 A cart is pulled to the right with 100 N and to the left with 85 N. Which way does the net force act? (a) to the left (b) no net force (c) to the right
40. 40.⚖️ Which class of lever is your forearm? (a) class 2 (b) class 1 (c) class 3

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