Engineering Worksheet: Part 2 Test

Engineering lesson 16: Part 2 test: forces and machines · Set 68 · 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.💪 Two children push a box to the right, one with 60 N and the other with 95 N. What is the net (total) force on the box, in newtons?
2. 2.⚖️ A lever balances when … (a) turning effects match (b) both weights are equal (c) the fulcrum moves (d) the bar is short
3. 3.💪 Which force is at work: rain falls to the ground? (a) magnetic force (b) muscular force (c) gravity (d) friction
4. 4.⚖️ Along a straight bar, measured from the left end, the effort is at 20 cm, the fulcrum at 0 cm and the load at 30 cm. Which class of lever is it? (a) class 2 (b) class 3 (c) class 1
5. 5.💪 In a tug of war, one team pulls left with 30 N and the other pulls right with 20 N. What is the size of the net force, in newtons?
6. 6.💪 Which force is at work: a fridge magnet sticks? (a) gravity (b) muscular force (c) friction (d) magnetic force
7. 7.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 1 N, a glass sheet 2 N, a carpet 6 N, sandpaper 8 N. How many newtons more were needed on sandpaper than on ice?
8. 8.🛞 More or less friction: a box pushed on carpet? (a) more friction (b) less friction
9. 9.⚙️ Which simple machine is a nut and bolt? (a) wheel and axle (b) pulley (c) lever (d) screw
10. 10.⚖️ In a class 1 lever, what is in the middle? (a) the effort (b) nothing (c) the load (d) the fulcrum
11. 11.💪 Which force is at work: a river flows downhill? (a) friction (b) gravity (c) magnetic force (d) muscular force
12. 12.⚖️ What is the pivot point of a lever called? (a) the fulcrum (b) the load (c) the axle (d) the effort
13. 13.⚖️ A seesaw balances. Kabir (260 N) sits 2 m from the pivot on one side; Ravi (? N) sits 2 m from the pivot on the other side. What is the missing weight in newtons?
14. 14.True or false: a fishing rod is a class 2 lever (load in the middle). (a) True (b) False
15. 15.⚖️ Along a straight bar, measured from the left end, the effort is at 80 cm, the fulcrum at 10 cm and the load at 50 cm. Which class of lever is it? (a) class 1 (b) class 3 (c) class 2
16. 16.🛞 Rubbing your hands fast makes them … (a) cold (b) wet (c) magnetic (d) warm
17. 17.Which of these is a wedge? (a) a window blind cord (b) a jar lid (c) a wood screw (d) a knife edge
18. 18.💪 Which force is at work: an apple falls down? (a) muscular force (b) magnetic force (c) gravity (d) friction
19. 19.🪝 More rope sections holding a load means … (a) less effort needed (b) the load floats (c) more effort needed (d) no change
20. 20.🪝 A pulley system lifts a 180 N load with an effort of 60 N. What is its mechanical advantage (MA)?
21. 21.True or false: a crowbar is a pulley. (a) True (b) False
22. 22.🔍 Which is the odd one out? (a) skating on ice (b) a tyre with deep treads (c) a rough doormat (d) chalk on a gym bar
23. 23.🪝 A pulley system lifts a 160 N load with an effort of 40 N. What is its mechanical advantage (MA)?
24. 24.💪 Which force is at work: pedalling a cycle? (a) friction (b) magnetic force (c) gravity (d) muscular force
25. 25.💪 Is pressing a doorbell a push or a pull? (a) a pull (b) a push
26. 26.🏋️ A smooth ramp is 12 m long and rises 2 m. What effort pushes a 1200 N box up it, in newtons? (ideal ramp, no friction)
27. 27.🏋️ Can a simple machine reduce the work done? (a) only on Mondays (b) yes, always (c) no, work stays the same (d) yes, by half
28. 28.🔍 Which is the odd one out? (a) a wheel on ball bearings (b) chalk on a gym bar (c) a wet tiled floor (d) powder on a carrom board
29. 29.⚖️ To lift a heavy rock with a crowbar more easily, push … (a) far from the fulcrum (b) on the rock (c) on the fulcrum (d) near the fulcrum
30. 30.True or false: a wet tiled floor gives more friction. (a) False (b) True
31. 31.⚖️ Going along a lever from one end to the other, the order is: fulcrum, load, effort. Which class of lever is it? (a) class 2 (b) class 1 (c) class 3
32. 32.🛞 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 3 N, a carpet 6 N. How many newtons more were needed on sandpaper than on ice?
33. 33.💪 In a tug of war, one team pulls left with 65 N and the other pulls right with 50 N. What is the size of the net force, in newtons?
34. 34.💪 A cart is pulled to the right with 70 N and to the left with 55 N. Which way does the net force act? (a) to the left (b) no net force (c) to the right
35. 35.🪝 Fixed or movable pulley: which one rises with the load? (a) a movable pulley (b) a fixed pulley
36. 36.⚖️ A seesaw balances. Meena (? N) sits 2 m from the pivot on one side; Zoya (380 N) sits 1 m from the pivot on the other side. What is the missing weight in newtons?
37. 37.🏋️ A longer ramp to the same height needs … (a) no effort (b) the same effort (c) more effort (d) less effort
38. 38.🏋️ Mechanical advantage (MA) = … (a) effort ÷ load (b) load + effort (c) load ÷ effort (d) load × effort
39. 39.🛞 More or less friction: a rough doormat? (a) more friction (b) less friction
40. 40.⚖️ In a class 3 lever, what is in the middle? (a) the load (b) the pulley (c) the fulcrum (d) the effort

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