Engineering Worksheet: Part 2 Test

Engineering lesson 16: Part 2 test: forces and machines · Set 404 · 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 bag has a mass of 25 kg. Taking 1 kg to weigh about 10 N, what is its weight in newtons?
2. 2.🪝 A well winch has a handle (wheel) of radius 24 cm turning an axle of radius 4 cm. What is its mechanical advantage (MA)?
3. 3.🏋️ A smooth ramp is 9 m long and rises 3 m. What effort pushes a 1650 N box up it, in newtons? (ideal ramp, no friction)
4. 4.⚙️ Which simple machine is a crane hook block? (a) screw (b) wheel and axle (c) lever (d) pulley
5. 5.🏋️ A smooth ramp is 18 m long and rises 3 m. What effort pushes a 1500 N box up it, in newtons? (ideal ramp, no friction)
6. 6.💪 Two children push a box to the right, one with 95 N and the other with 30 N. What is the net (total) force on the box, in newtons?
7. 7.⚙️ A wedge is … (a) a wheel on a rod (b) a bar on a pivot (c) a rope on a wheel (d) two ramps back to back
8. 8.💪 A bag has a mass of 49 kg. Taking 1 kg to weigh about 10 N, what is its weight in newtons?
9. 9.⚖️ Which class of lever is a pair of kitchen tongs? (a) class 2 (b) class 1 (c) class 3
10. 10.🛞 Friction acts … (a) only on ice (b) against the motion (c) only upwards (d) with the motion
11. 11.True or false: a pair of tweezers is a class 1 lever (fulcrum in the middle). (a) False (b) True
12. 12.💪 A cart is pulled to the right with 30 N and to the left with 20 N. Which way does the net force act? (a) to the right (b) to the left (c) no net force
13. 13.Which of these is caused by gravity? (a) a rolling ball slows (b) a fridge magnet sticks (c) a thrown ball comes down (d) squeezing a lemon
14. 14.⚖️ A lever bar balances. The load is 320 N at ? cm from the fulcrum. The effort is 200 N at 80 cm from the fulcrum on the other side. What is the missing distance in centimetres?
15. 15.🏋️ Pushing a crate 4 m took 160 J of work. What force was used, in newtons?
16. 16.⚖️ Which class of lever is a bottle opener? (a) class 3 (b) class 2 (c) class 1
17. 17.💪 In which unit do we measure force? (a) newton (N) (b) litre (L) (c) second (s) (d) metre (m)
18. 18.🛞 Is friction helpful or a problem here: a door hinge squeaking? (a) helpful (b) a problem
19. 19.💪 Is closing a drawer a push or a pull? (a) a pull (b) a push
20. 20.⚖️ A seesaw balances. Asha (380 N) sits 4 m from the pivot on one side; Meena (760 N) sits ? m from the pivot on the other side. What is the missing distance in metres?
21. 21.🪝 A pulley system has 4 rope sections holding up the load. To lift the load by 7 m, how many metres of rope must you pull?
22. 22.🪝 A pulley system has 3 rope sections holding up the load. To lift the load by 7 m, how many metres of rope must you pull?
23. 23.🔍 Which is the odd one out? (a) a wood screw (b) a jar lid (c) a well-bucket rope wheel (d) a nut and bolt
24. 24.⚖️ On a seesaw, a heavier child should sit … (a) on the pivot (b) farther from the pivot (c) closer to the pivot (d) anywhere
25. 25.⚖️ Along a straight bar, measured from the left end, the effort is at 50 cm, the fulcrum at 0 cm and the load at 20 cm. Which class of lever is it? (a) class 3 (b) class 1 (c) class 2
26. 26.True or false: a lemon squeezer is a class 3 lever (effort in the middle). (a) False (b) True
27. 27.🪝 A winch has a wheel of radius 9 cm and an axle of radius 3 cm. What effort on the wheel lifts a 210 N bucket on the axle, in newtons? (ideal)
28. 28.🪝 Fixed or movable pulley: which one rises with the load? (a) a fixed pulley (b) a movable pulley
29. 29.🏋️ Pushing a crate 4 m took 1480 J of work. What force was used, in newtons?
30. 30.⚖️ A seesaw balances. Arjun (160 N) sits 2 m from the pivot on one side; Zoya (320 N) sits ? m from the pivot on the other side. What is the missing distance in metres?
31. 31.🏋️ Can a simple machine reduce the work done? (a) yes, always (b) only on Mondays (c) no, work stays the same (d) yes, by half
32. 32.🛞 Rubbing your hands fast makes them … (a) magnetic (b) wet (c) warm (d) cold
33. 33.🏋️ Work is done when a force moves something … (a) without moving it (b) only upwards (c) through a distance (d) very slowly
34. 34.🛞 More or less friction: oil on a squeaky hinge? (a) more friction (b) less friction
35. 35.⚖️ Along a straight bar, measured from the left end, the effort is at 30 cm, the fulcrum at 40 cm and the load at 0 cm. Which class of lever is it? (a) class 3 (b) class 1 (c) class 2
36. 36.⚖️ Along a straight bar, measured from the left end, the effort is at 30 cm, the fulcrum at 60 cm and the load at 90 cm. Which class of lever is it? (a) class 2 (b) class 1 (c) class 3
37. 37.Which of these is a wedge? (a) a bottle opener (b) a chisel (c) a crowbar (d) a flagpole rope wheel
38. 38.🔍 Which is the odd one out? (a) a flagpole rope wheel (b) a crane hook block (c) a well-bucket rope wheel (d) a nutcracker
39. 39.🛞 More or less friction: a rough doormat? (a) less friction (b) more friction
40. 40.🏋️ A smooth ramp is 12 m long and rises 2 m. What effort pushes a 900 N box up it, in newtons? (ideal ramp, no friction)

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