Engineering Worksheet: Part 2 Test

Engineering lesson 16: Part 2 test: forces and machines · Set 760 · 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.⚖️ On a seesaw, a heavier child should sit … (a) on the pivot (b) farther from the pivot (c) anywhere (d) closer to the pivot
2. 2.💪 Which force is at work: squeezing a lemon? (a) gravity (b) friction (c) muscular force (d) magnetic force
3. 3.⚖️ A seesaw balances. Zoya (720 N) sits 3 m from the pivot on one side; Kabir (540 N) sits ? m from the pivot on the other side. What is the missing distance in metres?
4. 4.💪 A bag has a mass of 12 kg. Taking 1 kg to weigh about 10 N, what is its weight in newtons?
5. 5.True or false: a fishing rod is a class 2 lever (load in the middle). (a) False (b) True
6. 6.🏋️ Pushing a crate 1 m took 210 J of work. What force was used, in newtons?
7. 7.True or false: a road up a hill is a screw. (a) False (b) True
8. 8.⚖️ A lever balances when … (a) turning effects match (b) the bar is short (c) the fulcrum moves (d) both weights are equal
9. 9.🪝 Fixed or movable pulley: which one stays in one place? (a) a fixed pulley (b) a movable pulley
10. 10.⚖️ Which class of lever is a broom when sweeping? (a) class 1 (b) class 2 (c) class 3
11. 11.True or false: a lemon squeezer is a class 3 lever (effort in the middle). (a) False (b) True
12. 12.True or false: pulling a cart is a pull. (a) False (b) True
13. 13.⚖️ Going along a lever from one end to the other, the order is: effort, load, fulcrum. Which class of lever is it? (a) class 2 (b) class 1 (c) class 3
14. 14.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 8 N, sandpaper 11 N, ice 3 N, a glass sheet 6 N. Which surface gave the least friction? (a) a carpet (b) ice (c) sandpaper (d) a glass sheet
15. 15.🪝 A winch has a wheel of radius 5 cm and an axle of radius 1 cm. What effort on the wheel lifts a 350 N bucket on the axle, in newtons? (ideal)
16. 16.True or false: a fixed pulley halves the effort. (a) True (b) False
17. 17.🪝 A wheel and axle is a big wheel fixed to … (a) a smaller rod (axle) (b) a flat ramp (c) a sharp wedge (d) a loose rope
18. 18.🏋️ In which unit is work measured? (a) newton (N) (b) joule (J) (c) watt hour (d) metre (m)
19. 19.🏋️ A force of 330 N pushes a cart 4 m along the floor. How much work is done, in joules?
20. 20.⚖️ Which class of lever is a pair of kitchen tongs? (a) class 1 (b) class 3 (c) class 2
21. 21.Which of these is an inclined plane? (a) a seesaw (b) a road up a hill (c) a wood screw (d) a crane hook block
22. 22.🛞 More or less friction: sand on a slippery path? (a) less friction (b) more friction
23. 23.⚖️ Turning effect = force × … (a) mass of fulcrum (b) distance from fulcrum (c) colour of bar (d) time taken
24. 24.⚖️ Which class of lever is a nutcracker? (a) class 2 (b) class 1 (c) class 3
25. 25.True or false: pushing a swing is a pull. (a) False (b) True
26. 26.⚖️ Along a straight bar, measured from the left end, the effort is at 40 cm, the fulcrum at 80 cm and the load at 0 cm. Which class of lever is it? (a) class 2 (b) class 1 (c) class 3
27. 27.🪝 Fixed or movable pulley: which one hangs on the rope loop? (a) a fixed pulley (b) a movable pulley
28. 28.🏋️ A force of 40 N did 40 J of work. How many metres did the object move?
29. 29.💪 A bag has a mass of 25 kg. Taking 1 kg to weigh about 10 N, what is its weight in newtons?
30. 30.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 9 N, ice 2 N, a glass sheet 4 N, a carpet 6 N. Which surface gave the most friction? (a) a carpet (b) sandpaper (c) a glass sheet (d) ice
31. 31.🏋️ Mechanical advantage (MA) = … (a) effort ÷ load (b) load ÷ effort (c) load × effort (d) load + effort
32. 32.⚖️ Which class of lever is your forearm? (a) class 1 (b) class 2 (c) class 3
33. 33.💪 A cart is pulled to the right with 80 N and to the left with 85 N. Which way does the net force act? (a) to the right (b) no net force (c) to the left
34. 34.🏋️ Pushing a crate 8 m took 1120 J of work. What force was used, in newtons?
35. 35.True or false: kicking a football is a pull. (a) True (b) False
36. 36.True or false: a knife edge is a wedge. (a) True (b) False
37. 37.🏋️ A machine lifts a load of 600 N when you push with 150 N. What is its mechanical advantage (MA)?
38. 38.True or false: a fixed pulley needs effort = load. (a) True (b) False
39. 39.🔍 Which is the odd one out? (a) a crowbar (b) a seesaw (c) a knife edge (d) a bottle opener
40. 40.🏋️ Pushing a crate 7 m took 350 J of work. What force was used, in newtons?

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