Engineering Worksheet: Part 2 Test

Engineering lesson 16: Part 2 test: forces and machines · Set 415 · 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.🏋️ Mechanical advantage (MA) = … (a) load × effort (b) load + effort (c) effort ÷ load (d) load ÷ effort
2. 2.True or false: a fixed pulley stays in one place. (a) True (b) False
3. 3.⚙️ Most simple machines make work easier by letting us … (a) use a smaller force (b) stop all friction (c) make new energy (d) switch off gravity
4. 4.True or false: a round doorknob is an inclined plane. (a) False (b) True
5. 5.🏋️ Can a simple machine reduce the work done? (a) yes, by half (b) no, work stays the same (c) yes, always (d) only on Mondays
6. 6.🪝 A load of 560 N hangs from a pulley system in which 4 rope sections hold up the load. What effort is needed, in newtons? (ideal pulleys)
7. 7.True or false: closing a drawer is a push. (a) False (b) True
8. 8.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 8 N, sandpaper 9 N, ice 3 N, a wooden plank 7 N. Which surface gave the most friction? (a) sandpaper (b) ice (c) a carpet (d) a wooden plank
9. 9.True or false: plucking a mango is a push. (a) True (b) False
10. 10.🪝 More rope sections holding a load means … (a) less effort needed (b) more effort needed (c) the load floats (d) no change
11. 11.🔍 Which is the odd one out? (a) a bottle cap (b) an axe blade (c) a wood screw (d) a nut and bolt
12. 12.💪 In a tug of war, one team pulls right with 75 N and the other pulls left with 35 N. What is the size of the net force, in newtons?
13. 13.🪝 A load of 560 N hangs from a pulley system in which 2 rope sections hold up the load. What effort is needed, in newtons? (ideal pulleys)
14. 14.⚖️ What is the pivot point of a lever called? (a) the fulcrum (b) the effort (c) the load (d) the axle
15. 15.⚙️ How many simple machines are there in the usual list? (a) 10 (b) 6 (c) 12 (d) 3
16. 16.⚖️ Which class of lever is a seesaw? (a) class 2 (b) class 1 (c) class 3
17. 17.⚖️ A lever bar balances. The load is ? N at 50 cm from the fulcrum. The effort is 500 N at 50 cm from the fulcrum on the other side. What is the missing force in newtons?
18. 18.True or false: a fixed pulley makes you pull 2× rope. (a) True (b) False
19. 19.⚖️ To lift a heavy rock with a crowbar more easily, push … (a) far from the fulcrum (b) on the rock (c) near the fulcrum (d) on the fulcrum
20. 20.True or false: a window blind cord is a pulley. (a) True (b) False
21. 21.💪 Two equal forces push on a box from opposite sides. They are … (a) doubled (b) gravity (c) balanced (d) unbalanced
22. 22.True or false: a fixed pulley halves the effort. (a) True (b) False
23. 23.⚖️ A lever bar balances. The load is 120 N at ? cm from the fulcrum. The effort is 120 N at 30 cm from the fulcrum on the other side. What is the missing distance in centimetres?
24. 24.⚖️ A lever bar balances. The load is 400 N at ? cm from the fulcrum. The effort is 50 N at 80 cm from the fulcrum on the other side. What is the missing distance in centimetres?
25. 25.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 1 N, a wooden plank 2 N, a carpet 6 N, sandpaper 10 N. Which surface gave the most friction? (a) a wooden plank (b) a carpet (c) sandpaper (d) a glass sheet
26. 26.True or false: pressing a doorbell is a push. (a) False (b) True
27. 27.True or false: a movable pulley rises with the load. (a) True (b) False
28. 28.🔍 Which is the odd one out? (a) a bottle opener (b) a seesaw (c) a crowbar (d) the tip of a nail
29. 29.True or false: sand on a slippery path gives more friction. (a) False (b) True
30. 30.⚖️ A seesaw balances. Ravi (150 N) sits ? m from the pivot on one side; Kabir (600 N) sits 1 m from the pivot on the other side. What is the missing distance in metres?
31. 31.True or false: a box pushed on carpet gives more friction. (a) False (b) True
32. 32.Which of these is a screw? (a) a wood screw (b) a truck loading ramp (c) a claw hammer on a nail (d) a steering wheel
33. 33.⚖️ A seesaw balances. Meena (240 N) sits 2 m from the pivot on one side; Ravi (240 N) sits ? m from the pivot on the other side. What is the missing distance in metres?
34. 34.⚖️ Along a straight bar, measured from the left end, the effort is at 20 cm, the fulcrum at 80 cm and the load at 40 cm. Which class of lever is it? (a) class 3 (b) class 1 (c) class 2
35. 35.⚖️ Which class of lever is your forearm? (a) class 3 (b) class 1 (c) class 2
36. 36.🏋️ Work is done when a force moves something … (a) only upwards (b) very slowly (c) without moving it (d) through a distance
37. 37.💪 In a tug of war, one team pulls left with 85 N and the other pulls right with 80 N. What is the size of the net force, in newtons?
38. 38.⚖️ Along a straight bar, measured from the left end, the effort is at 50 cm, the fulcrum at 30 cm and the load at 90 cm. Which class of lever is it? (a) class 2 (b) class 1 (c) class 3
39. 39.🏋️ A 16 kg box is lifted straight up by 4 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
40. 40.True or false: a nutcracker is an inclined plane. (a) True (b) False

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