Engineering Worksheet: Part 2 Test

Engineering lesson 16: Part 2 test: forces and machines · Set 54 · 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.Which of these is a screw? (a) a wood screw (b) a window blind cord (c) a flagpole rope wheel (d) an axe blade
2. 2.True or false: a nutcracker is a pulley. (a) False (b) True
3. 3.⚖️ A lever bar balances. The load is 240 N at 50 cm from the fulcrum. The effort is ? N at 80 cm from the fulcrum on the other side. What is the missing force in newtons?
4. 4.🏋️ A 1 kg box is lifted straight up by 1 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
5. 5.🪝 A pulley system lifts a 160 N load with an effort of 40 N. What is its mechanical advantage (MA)?
6. 6.💪 A bag has a mass of 58 kg. Taking 1 kg to weigh about 10 N, what is its weight in newtons?
7. 7.🪝 Fixed or movable pulley: which one only changes direction? (a) a fixed pulley (b) a movable pulley
8. 8.⚖️ Which class of lever is a pair of pliers? (a) class 3 (b) class 2 (c) class 1
9. 9.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 3 N, a wooden plank 5 N, a carpet 6 N, sandpaper 8 N. Which surface gave the most friction? (a) ice (b) a carpet (c) a wooden plank (d) sandpaper
10. 10.True or false: a door stopper is a screw. (a) False (b) True
11. 11.🏋️ Pushing a crate 2 m took 280 J of work. What force was used, in newtons?
12. 12.💪 A cart is pulled to the right with 35 N and to the left with 40 N. Which way does the net force act? (a) to the left (b) to the right (c) no net force
13. 13.True or false: a crane hook block is a lever. (a) True (b) False
14. 14.🛞 Is friction helpful or a problem here: dragging a heavy box? (a) helpful (b) a problem
15. 15.⚙️ Which simple machine is a claw hammer on a nail? (a) wheel and axle (b) pulley (c) lever (d) inclined plane
16. 16.🪝 A pulley system lifts a 960 N load with an effort of 240 N. What is its mechanical advantage (MA)?
17. 17.🛞 Is friction helpful or a problem here: striking a matchstick? (a) a problem (b) helpful
18. 18.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 15 N, ice 4 N, a glass sheet 7 N, a wooden plank 11 N. How many newtons more were needed on a carpet than on ice?
19. 19.⚖️ Going along a lever from one end to the other, the order is: load, fulcrum, effort. Which class of lever is it? (a) class 2 (b) class 3 (c) class 1
20. 20.⚙️ Which simple machine is a well winch handle? (a) wedge (b) lever (c) pulley (d) wheel and axle
21. 21.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 4 N, a wooden plank 8 N, a carpet 12 N, sandpaper 14 N. Which surface gave the least friction? (a) a wooden plank (b) a glass sheet (c) a carpet (d) sandpaper
22. 22.⚖️ A seesaw balances. Meena (110 N) sits ? m from the pivot on one side; Arjun (110 N) sits 1 m from the pivot on the other side. What is the missing distance in metres?
23. 23.⚖️ A lever bar balances. The load is 40 N at 50 cm from the fulcrum. The effort is ? N at 20 cm from the fulcrum on the other side. What is the missing force in newtons?
24. 24.💪 In a tug of war, one team pulls right with 70 N and the other pulls left with 40 N. What is the size of the net force, in newtons?
25. 25.🏋️ Pushing a crate 7 m took 1890 J of work. What force was used, in newtons?
26. 26.🔍 Which is the odd one out? (a) a nut and bolt (b) a jar lid (c) a seesaw (d) a bottle cap
27. 27.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 2 N, a glass sheet 5 N, a wooden plank 6 N, a carpet 7 N. How many newtons more were needed on a carpet than on ice?
28. 28.⚖️ In a class 3 lever, what is in the middle? (a) the load (b) the effort (c) the fulcrum (d) the pulley
29. 29.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 5 N, sandpaper 6 N, a glass sheet 1 N, a wooden plank 2 N. Which surface gave the least friction? (a) sandpaper (b) a wooden plank (c) a carpet (d) a glass sheet
30. 30.💪 Is closing a drawer a push or a pull? (a) a push (b) a pull
31. 31.🏋️ A machine lifts a load of 320 N when you push with 160 N. What is its mechanical advantage (MA)?
32. 32.⚖️ On a seesaw, a heavier child should sit … (a) anywhere (b) closer to the pivot (c) on the pivot (d) farther from the pivot
33. 33.🪝 A pulley system lifts a 380 N load with an effort of 190 N. What is its mechanical advantage (MA)?
34. 34.⚖️ A lever bar balances. The load is 270 N at ? cm from the fulcrum. The effort is 270 N at 30 cm from the fulcrum on the other side. What is the missing distance in centimetres?
35. 35.💪 Two equal forces push on a box from opposite sides. They are … (a) balanced (b) doubled (c) unbalanced (d) gravity
36. 36.🪝 A bucket weighing 200 N is lifted with a single fixed pulley at the top of a well. What effort is needed, in newtons? (ideal pulley, no friction)
37. 37.True or false: sand on a slippery path gives less friction. (a) True (b) False
38. 38.⚖️ A lever balances when … (a) the fulcrum moves (b) the bar is short (c) both weights are equal (d) turning effects match
39. 39.⚖️ A seesaw balances. Meena (? N) sits 2 m from the pivot on one side; Ravi (240 N) sits 4 m from the pivot on the other side. What is the missing weight in newtons?
40. 40.🪝 A load of 100 N hangs from a pulley system in which 2 rope sections hold up the load. What effort is needed, in newtons? (ideal pulleys)

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