Engineering Worksheet: Part 2 Test

Engineering lesson 16: Part 2 test: forces and machines · Set 799 · 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.⚙️ How many simple machines are there in the usual list? (a) 10 (b) 12 (c) 3 (d) 6
2. 2.True or false: a window blind cord is a pulley. (a) False (b) True
3. 3.⚖️ A lever bar balances. The load is 100 N at 10 cm from the fulcrum. The effort is 10 N at ? cm from the fulcrum on the other side. What is the missing distance in centimetres?
4. 4.🪝 A load of 920 N hangs from a pulley system in which 4 rope sections hold up the load. What effort is needed, in newtons? (ideal pulleys)
5. 5.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 8 N, ice 1 N, a glass sheet 3 N, a carpet 7 N. Which surface gave the least friction? (a) ice (b) a carpet (c) sandpaper (d) a glass sheet
6. 6.⚖️ A seesaw balances. Kabir (120 N) sits 1 m from the pivot on one side; Asha (120 N) sits ? m from the pivot on the other side. What is the missing distance in metres?
7. 7.⚖️ Going along a lever from one end to the other, the order is: effort, load, fulcrum. Which class of lever is it? (a) class 1 (b) class 3 (c) class 2
8. 8.💪 Two children push a box to the right, one with 85 N and the other with 90 N. What is the net (total) force on the box, in newtons?
9. 9.⚖️ Going along a lever from one end to the other, the order is: load, effort, fulcrum. Which class of lever is it? (a) class 1 (b) class 2 (c) class 3
10. 10.True or false: your forearm is a class 3 lever (effort in the middle). (a) False (b) True
11. 11.🏋️ A machine lifts a load of 40 N when you push with 20 N. What is its mechanical advantage (MA)?
12. 12.💪 Which force is at work: a river flows downhill? (a) friction (b) muscular force (c) magnetic force (d) gravity
13. 13.⚖️ Turning effect = force × … (a) distance from fulcrum (b) colour of bar (c) time taken (d) mass of fulcrum
14. 14.🏋️ A 3 kg box is lifted straight up by 5 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
15. 15.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 10 N, ice 3 N, a wooden plank 6 N, a carpet 7 N. Which surface gave the most friction? (a) a wooden plank (b) a carpet (c) ice (d) sandpaper
16. 16.⚖️ A lever bar balances. The load is 810 N at 50 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?
17. 17.True or false: a movable pulley rises with the load. (a) True (b) False
18. 18.🏋️ Can a simple machine reduce the work done? (a) no, work stays the same (b) yes, always (c) yes, by half (d) only on Mondays
19. 19.⚖️ A lever bar balances. The load is ? N at 40 cm from the fulcrum. The effort is 280 N at 80 cm from the fulcrum on the other side. What is the missing force in newtons?
20. 20.Which of these is caused by magnetic force? (a) pedalling a cycle (b) a river flows downhill (c) brakes stop a bicycle (d) a fridge magnet sticks
21. 21.🛞 Which surface gives the MOST friction to a sliding block? (a) polished marble (b) sandpaper (c) glass (d) ice
22. 22.🏋️ 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?
23. 23.💪 Is pulling a cart a push or a pull? (a) a push (b) a pull
24. 24.⚖️ Which class of lever is a fishing rod? (a) class 2 (b) class 3 (c) class 1
25. 25.⚖️ On a seesaw, a heavier child should sit … (a) anywhere (b) closer to the pivot (c) farther from the pivot (d) on the pivot
26. 26.🏋️ Pushing a crate 3 m took 450 J of work. What force was used, in newtons?
27. 27.⚖️ A seesaw balances. Asha (190 N) sits ? m from the pivot on one side; Zoya (190 N) sits 1 m from the pivot on the other side. What is the missing distance in metres?
28. 28.🏋️ Pushing a crate 6 m took 2820 J of work. What force was used, in newtons?
29. 29.Which of these is caused by magnetic force? (a) a rolling ball slows (b) shoes grip the floor (c) a thrown ball comes down (d) a magnet picks up pins
30. 30.True or false: plucking a mango is a push. (a) False (b) True
31. 31.⚙️ A wedge is … (a) a wheel on a rod (b) two ramps back to back (c) a rope on a wheel (d) a bar on a pivot
32. 32.⚖️ Which class of lever is a beam balance? (a) class 3 (b) class 1 (c) class 2
33. 33.🏋️ A smooth ramp is 15 m long and rises 3 m. What effort pushes a 2000 N box up it, in newtons? (ideal ramp, no friction)
34. 34.🏋️ In which unit is work measured? (a) watt hour (b) metre (m) (c) joule (J) (d) newton (N)
35. 35.⚖️ A seesaw balances. Kabir (570 N) sits 3 m from the pivot on one side; Meena (570 N) sits ? m from the pivot on the other side. What is the missing distance in metres?
36. 36.🛞 Rubbing your hands fast makes them … (a) warm (b) magnetic (c) wet (d) cold
37. 37.⚖️ In a class 1 lever, what is in the middle? (a) nothing (b) the effort (c) the fulcrum (d) the load
38. 38.🏋️ A force of 310 N did 620 J of work. How many metres did the object move?
39. 39.🪝 A pulley system has 4 rope sections holding up the load. To lift the load by 4 m, how many metres of rope must you pull?
40. 40.🪝 What does a single fixed pulley change? (a) the size of the load (b) gravity (c) the direction of pull (d) the colour of rope

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