Engineering Worksheet: Part 2 Test

Engineering lesson 16: Part 2 test: forces and machines · Set 466 · 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.⚖️ Along a straight bar, measured from the left end, the effort is at 0 cm, the fulcrum at 40 cm and the load at 80 cm. Which class of lever is it? (a) class 3 (b) class 1 (c) class 2
2. 2.💪 In a tug of war, one team pulls left with 90 N and the other pulls right with 65 N. What is the size of the net force, in newtons?
3. 3.🏋️ A machine lifts a load of 60 N when you push with 30 N. What is its mechanical advantage (MA)?
4. 4.💪 Which force pulls everything towards the Earth? (a) wind (b) friction (c) magnetism (d) gravity
5. 5.⚖️ Which class of lever is a broom when sweeping? (a) class 2 (b) class 3 (c) class 1
6. 6.⚙️ Which simple machine is a claw hammer on a nail? (a) pulley (b) wheel and axle (c) screw (d) lever
7. 7.🛞 Is friction helpful or a problem here: a knot holding a rope? (a) helpful (b) a problem
8. 8.🏋️ Work is done when a force moves something … (a) through a distance (b) without moving it (c) very slowly (d) only upwards
9. 9.🏋️ Pushing a crate 2 m took 260 J of work. What force was used, in newtons?
10. 10.⚖️ On a seesaw, a heavier child should sit … (a) farther from the pivot (b) on the pivot (c) anywhere (d) closer to the pivot
11. 11.💪 A cart is pulled to the right with 60 N and to the left with 60 N. Which way does the net force act? (a) to the right (b) to the left (c) no net force
12. 12.⚖️ A seesaw balances. Arjun (? N) sits 1 m from the pivot on one side; Zoya (180 N) sits 2 m from the pivot on the other side. What is the missing weight in newtons?
13. 13.🏋️ A 4 kg box is lifted straight up by 2 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
14. 14.🪝 Fixed or movable pulley: which one halves the effort? (a) a fixed pulley (b) a movable pulley
15. 15.🛞 How can we reduce friction in a machine? (a) make parts rough (b) press parts harder (c) add sand (d) oil the moving parts
16. 16.🔍 Which is the odd one out? (a) a jar lid (b) a wood screw (c) a knife edge (d) a bottle cap
17. 17.🪝 A pulley system lifts a 200 N load with an effort of 50 N. What is its mechanical advantage (MA)?
18. 18.🪝 A pulley system has 1 rope section holding up the load. To lift the load by 7 m, how many metres of rope must you pull?
19. 19.🛞 More or less friction: powder on a carrom board? (a) more friction (b) less friction
20. 20.True or false: a bottle opener is a class 2 lever (load in the middle). (a) True (b) False
21. 21.⚖️ Along a straight bar, measured from the left end, the effort is at 50 cm, the fulcrum at 20 cm and the load at 80 cm. Which class of lever is it? (a) class 1 (b) class 3 (c) class 2
22. 22.⚖️ Going along a lever from one end to the other, the order is: fulcrum, load, effort. Which class of lever is it? (a) class 3 (b) class 1 (c) class 2
23. 23.⚖️ A seesaw balances. Ravi (330 N) sits 4 m from the pivot on one side; Meena (440 N) sits ? m from the pivot on the other side. What is the missing distance in metres?
24. 24.⚖️ A lever bar balances. The load is 450 N at 10 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.🛞 More or less friction: a grippy rubber sole? (a) less friction (b) more friction
26. 26.💪 In a tug of war, one team pulls right with 65 N and the other pulls left with 5 N. What is the size of the net force, in newtons?
27. 27.True or false: a nutcracker is a lever. (a) False (b) True
28. 28.⚖️ Which class of lever is a seesaw? (a) class 1 (b) class 3 (c) class 2
29. 29.🪝 A bucket weighing 220 N is lifted with a single fixed pulley at the top of a well. What effort is needed, in newtons? (ideal pulley, no friction)
30. 30.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 12 N, ice 3 N, a glass sheet 7 N, a carpet 8 N. Which surface gave the least friction? (a) a glass sheet (b) ice (c) sandpaper (d) a carpet
31. 31.🪝 A load of 160 N hangs from a pulley system in which 2 rope sections hold up the load. What effort is needed, in newtons? (ideal pulleys)
32. 32.🪝 Fixed or movable pulley: which one rises with the load? (a) a movable pulley (b) a fixed pulley
33. 33.⚖️ Which class of lever is a pair of kitchen tongs? (a) class 3 (b) class 2 (c) class 1
34. 34.Which of these is an inclined plane? (a) a playground slide (b) a crane hook block (c) a round doorknob (d) a crowbar
35. 35.⚖️ Along a straight bar, measured from the left end, the effort is at 70 cm, the fulcrum at 30 cm and the load at 90 cm. Which class of lever is it? (a) class 3 (b) class 1 (c) class 2
36. 36.💪 In which unit do we measure force? (a) litre (L) (b) second (s) (c) newton (N) (d) metre (m)
37. 37.⚖️ Along a straight bar, measured from the left end, the effort is at 70 cm, the fulcrum at 10 cm and the load at 50 cm. Which class of lever is it? (a) class 1 (b) class 2 (c) class 3
38. 38.⚙️ How many simple machines are there in the usual list? (a) 6 (b) 12 (c) 10 (d) 3
39. 39.🔍 Which is the odd one out? (a) a wheel on ball bearings (b) a grippy rubber sole (c) powder on a carrom board (d) a wet tiled floor
40. 40.🪝 Fixed or movable pulley: which one only changes direction? (a) a fixed pulley (b) a movable pulley

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