Engineering Worksheet: Part 2 Test

Engineering lesson 16: Part 2 test: forces and machines · Set 74 · 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.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 10 N, sandpaper 12 N, ice 3 N, a wooden plank 7 N. Which surface gave the least friction? (a) a wooden plank (b) sandpaper (c) ice (d) a carpet
2. 2.⚖️ A lever bar balances. The load is ? N at 20 cm from the fulcrum. The effort is 200 N at 30 cm from the fulcrum on the other side. What is the missing force in newtons?
3. 3.🏋️ A force of 200 N did 1000 J of work. How many metres did the object move?
4. 4.⚙️ How many simple machines are there in the usual list? (a) 3 (b) 10 (c) 12 (d) 6
5. 5.🏋️ Pushing a crate 4 m took 840 J of work. What force was used, in newtons?
6. 6.🏋️ Pushing a crate 5 m took 50 J of work. What force was used, in newtons?
7. 7.🪝 Fixed or movable pulley: which one makes you pull 2× rope? (a) a fixed pulley (b) a movable pulley
8. 8.⚙️ A wedge is … (a) a wheel on a rod (b) a rope on a wheel (c) a bar on a pivot (d) two ramps back to back
9. 9.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 7 N, sandpaper 8 N, ice 2 N, a glass sheet 5 N. Which surface gave the most friction? (a) sandpaper (b) a wooden plank (c) a glass sheet (d) ice
10. 10.🔍 Which is the odd one out? (a) a smooth steel slide (b) powder on a carrom board (c) a wheel on ball bearings (d) a box pushed on carpet
11. 11.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 10 N, sandpaper 12 N, ice 4 N, a wooden plank 7 N. How many newtons more were needed on sandpaper than on ice?
12. 12.⚖️ A seesaw balances. Ravi (? N) sits 4 m from the pivot on one side; Arjun (600 N) sits 2 m from the pivot on the other side. What is the missing weight in newtons?
13. 13.🛞 More or less friction: powder on a carrom board? (a) less friction (b) more friction
14. 14.True or false: a fixed pulley needs effort = load. (a) True (b) False
15. 15.⚖️ A seesaw balances. Ravi (440 N) sits 1 m from the pivot on one side; Arjun (110 N) sits ? m from the pivot on the other side. What is the missing distance in metres?
16. 16.⚖️ Along a straight bar, measured from the left end, the effort is at 20 cm, the fulcrum at 30 cm and the load at 70 cm. Which class of lever is it? (a) class 1 (b) class 2 (c) class 3
17. 17.🏋️ Work is done when a force moves something … (a) only upwards (b) through a distance (c) very slowly (d) without moving it
18. 18.🪝 A pulley system has 4 rope sections holding up the load. To lift the load by 8 m, how many metres of rope must you pull?
19. 19.Which of these is an inclined plane? (a) a well-bucket rope wheel (b) a jar lid (c) a road up a hill (d) a door stopper
20. 20.True or false: a window blind cord is a pulley. (a) True (b) False
21. 21.🛞 More or less friction: a wheel on ball bearings? (a) less friction (b) more friction
22. 22.🏋️ A force of 150 N did 300 J of work. How many metres did the object move?
23. 23.True or false: drawing up a well bucket is a push. (a) False (b) True
24. 24.💪 Which force is at work: an apple falls down? (a) gravity (b) friction (c) magnetic force (d) muscular force
25. 25.⚖️ A seesaw balances. Zoya (600 N) sits 4 m from the pivot on one side; Arjun (600 N) sits ? m from the pivot on the other side. What is the missing distance in metres?
26. 26.⚖️ A lever bar balances. The load is ? N at 10 cm from the fulcrum. The effort is 10 N at 20 cm from the fulcrum on the other side. What is the missing force in newtons?
27. 27.🏋️ A machine lifts a load of 210 N when you push with 70 N. What is its mechanical advantage (MA)?
28. 28.True or false: a fixed pulley halves the effort. (a) True (b) False
29. 29.⚖️ On a seesaw, a heavier child should sit … (a) closer to the pivot (b) anywhere (c) farther from the pivot (d) on the pivot
30. 30.🏋️ A force of 330 N did 1320 J of work. How many metres did the object move?
31. 31.🏋️ Mechanical advantage (MA) = … (a) load + effort (b) effort ÷ load (c) load ÷ effort (d) load × effort
32. 32.🏋️ 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
33. 33.💪 Two children push a box to the right, one with 10 N and the other with 40 N. What is the net (total) force on the box, in newtons?
34. 34.🛞 More or less friction: a smooth steel slide? (a) more friction (b) less friction
35. 35.💪 Two children push a box to the right, one with 10 N and the other with 50 N. What is the net (total) force on the box, in newtons?
36. 36.🔍 Which is the odd one out? (a) a wheel on ball bearings (b) oil on a squeaky hinge (c) a wet tiled floor (d) a rough doormat
37. 37.🛞 Is friction helpful or a problem here: striking a matchstick? (a) helpful (b) a problem
38. 38.True or false: plucking a mango is a pull. (a) True (b) False
39. 39.True or false: a fixed pulley makes you pull 2× rope. (a) True (b) False
40. 40.🏋️ A force of 450 N pushes a cart 2 m along the floor. How much work is done, in joules?

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