Engineering Worksheet: Part 2 Test

Engineering lesson 16: Part 2 test: forces and machines · Set 631 · 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 lever bar balances. The load is 90 N at ? cm from the fulcrum. The effort is 50 N at 90 cm from the fulcrum on the other side. What is the missing distance in centimetres?
2. 2.🪝 More rope sections holding a load means … (a) no change (b) less effort needed (c) more effort needed (d) the load floats
3. 3.⚖️ Along a straight bar, measured from the left end, the effort is at 0 cm, the fulcrum at 70 cm and the load at 30 cm. Which class of lever is it? (a) class 3 (b) class 1 (c) class 2
4. 4.⚖️ A lever bar balances. The load is ? N at 20 cm from the fulcrum. The effort is 40 N at 90 cm from the fulcrum on the other side. What is the missing force in newtons?
5. 5.💪 Which force pulls everything towards the Earth? (a) friction (b) gravity (c) wind (d) magnetism
6. 6.🛞 Is friction helpful or a problem here: brakes stopping a cycle? (a) helpful (b) a problem
7. 7.💪 A cart is pulled to the right with 25 N and to the left with 25 N. Which way does the net force act? (a) to the left (b) to the right (c) no net force
8. 8.Which of these is a wedge? (a) a bottle cap (b) an axe blade (c) a nutcracker (d) a playground slide
9. 9.🪝 A pulley system lifts a 340 N load with an effort of 170 N. What is its mechanical advantage (MA)?
10. 10.True or false: a bottle cap is a screw. (a) False (b) True
11. 11.🏋️ In which unit is work measured? (a) watt hour (b) joule (J) (c) metre (m) (d) newton (N)
12. 12.⚙️ Which simple machine is a steering wheel? (a) wedge (b) wheel and axle (c) pulley (d) screw
13. 13.⚖️ Going along a lever from one end to the other, the order is: effort, fulcrum, load. Which class of lever is it? (a) class 3 (b) class 1 (c) class 2
14. 14.🪝 A bucket weighing 40 N is lifted with a single fixed pulley at the top of a well. What effort is needed, in newtons? (ideal pulley, no friction)
15. 15.🏋️ A force of 140 N did 560 J of work. How many metres did the object move?
16. 16.🏋️ Work is done when a force moves something … (a) very slowly (b) without moving it (c) only upwards (d) through a distance
17. 17.💪 A bag has a mass of 44 kg. Taking 1 kg to weigh about 10 N, what is its weight in newtons?
18. 18.⚖️ What is the pivot point of a lever called? (a) the load (b) the effort (c) the axle (d) the fulcrum
19. 19.⚖️ A lever bar balances. The load is 180 N at ? cm from the fulcrum. The effort is 100 N at 90 cm from the fulcrum on the other side. What is the missing distance in centimetres?
20. 20.⚙️ A screw is really … (a) a bent lever (b) a kind of wheel (c) a tiny pulley (d) a ramp wrapped round
21. 21.⚖️ A seesaw balances. Asha (680 N) sits ? m from the pivot on one side; Kabir (510 N) sits 4 m from the pivot on the other side. What is the missing distance in metres?
22. 22.💪 Is pressing a doorbell a push or a pull? (a) a pull (b) a push
23. 23.⚖️ A seesaw balances. Meena (? N) sits 1 m from the pivot on one side; Asha (190 N) sits 4 m from the pivot on the other side. What is the missing weight in newtons?
24. 24.⚖️ A lever bar balances. The load is 40 N at 50 cm from the fulcrum. The effort is 50 N at ? cm from the fulcrum on the other side. What is the missing distance in centimetres?
25. 25.⚙️ Which simple machine is a wood screw? (a) inclined plane (b) wheel and axle (c) screw (d) pulley
26. 26.🪝 A load of 240 N hangs from a pulley system in which 2 rope sections hold up the load. What effort is needed, in newtons? (ideal pulleys)
27. 27.🛞 Is friction helpful or a problem here: shoe soles wearing out? (a) helpful (b) a problem
28. 28.💪 A bag has a mass of 28 kg. Taking 1 kg to weigh about 10 N, what is its weight in newtons?
29. 29.🏋️ Can a simple machine reduce the work done? (a) yes, always (b) no, work stays the same (c) yes, by half (d) only on Mondays
30. 30.⚖️ Along a straight bar, measured from the left end, the effort is at 30 cm, the fulcrum at 80 cm and the load at 60 cm. Which class of lever is it? (a) class 2 (b) class 1 (c) class 3
31. 31.💪 Which force is at work: a magnet picks up pins? (a) magnetic force (b) friction (c) gravity (d) muscular force
32. 32.🔍 Which is the odd one out? (a) a box pushed on carpet (b) a grippy rubber sole (c) a wet tiled floor (d) a tyre with deep treads
33. 33.💪 Which force is at work: a river flows downhill? (a) magnetic force (b) friction (c) muscular force (d) gravity
34. 34.True or false: a rough doormat gives less friction. (a) False (b) True
35. 35.True or false: opening a drawer is a push. (a) False (b) True
36. 36.🏋️ A machine lifts a load of 210 N when you push with 70 N. What is its mechanical advantage (MA)?
37. 37.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 3 N, a glass sheet 4 N, a wooden plank 6 N, sandpaper 7 N. How many newtons more were needed on sandpaper than on ice?
38. 38.💪 A bag has a mass of 40 kg. Taking 1 kg to weigh about 10 N, what is its weight in newtons?
39. 39.⚖️ A lever bar balances. The load is ? N at 30 cm from the fulcrum. The effort is 120 N at 80 cm from the fulcrum on the other side. What is the missing force in newtons?
40. 40.⚖️ A seesaw balances. Meena (? N) sits 2 m from the pivot on one side; Kabir (260 N) sits 4 m from the pivot on the other side. What is the missing weight in newtons?

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