Engineering Worksheet: Part 2 Test

Engineering lesson 16: Part 2 test: forces and machines · Set 587 · 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.⚖️ Along a straight bar, measured from the left end, the effort is at 60 cm, the fulcrum at 10 cm and the load at 40 cm. Which class of lever is it? (a) class 1 (b) class 3 (c) class 2
2. 2.True or false: a nutcracker is a class 2 lever (load in the middle). (a) False (b) True
3. 3.🛞 More or less friction: chalk on a gym bar? (a) less friction (b) more friction
4. 4.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 4 N, a wooden plank 7 N, a carpet 11 N, sandpaper 13 N. Which surface gave the most friction? (a) a carpet (b) a wooden plank (c) a glass sheet (d) sandpaper
5. 5.True or false: a pair of pliers is a class 3 lever (effort in the middle). (a) False (b) True
6. 6.🏋️ A machine lifts a load of 90 N when you push with 30 N. What is its mechanical advantage (MA)?
7. 7.True or false: plucking a mango is a push. (a) False (b) True
8. 8.⚖️ A seesaw balances. Ravi (280 N) sits ? m from the pivot on one side; Kabir (560 N) sits 2 m from the pivot on the other side. What is the missing distance in metres?
9. 9.⚖️ A lever bar balances. The load is 540 N at 40 cm from the fulcrum. The effort is 240 N at ? cm from the fulcrum on the other side. What is the missing distance in centimetres?
10. 10.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 4 N, a carpet 8 N, sandpaper 9 N, ice 3 N. Which surface gave the least friction? (a) ice (b) a carpet (c) sandpaper (d) a wooden plank
11. 11.💪 Which force pulls everything towards the Earth? (a) wind (b) magnetism (c) friction (d) gravity
12. 12.⚖️ A seesaw balances. Ravi (? N) sits 4 m from the pivot on one side; Arjun (440 N) sits 2 m from the pivot on the other side. What is the missing weight in newtons?
13. 13.Which of these is a pulley? (a) a crane hook block (b) a knife edge (c) a screw jack (d) a seesaw
14. 14.🛞 More or less friction: sand on a slippery path? (a) less friction (b) more friction
15. 15.⚙️ A screw is really … (a) a tiny pulley (b) a kind of wheel (c) a ramp wrapped round (d) a bent lever
16. 16.🪝 More rope sections holding a load means … (a) the load floats (b) less effort needed (c) no change (d) more effort needed
17. 17.🏋️ Pushing a crate 7 m took 1610 J of work. What force was used, in newtons?
18. 18.🛞 Why are tyres made with deep treads? (a) to grip the road (b) to save rubber (c) to look nice (d) to go slower
19. 19.🔍 Which is the odd one out? (a) a box pushed on carpet (b) a tyre with deep treads (c) a wet tiled floor (d) a grippy rubber sole
20. 20.True or false: a fixed pulley stays in one place. (a) False (b) True
21. 21.Which of these is a wheel and axle? (a) a flagpole rope wheel (b) a knife edge (c) a well winch handle (d) a nutcracker
22. 22.🛞 More or less friction: skating on ice? (a) more friction (b) less friction
23. 23.🛞 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 carpet 7 N, sandpaper 8 N. Which surface gave the least friction? (a) a glass sheet (b) ice (c) sandpaper (d) a carpet
24. 24.💪 Is a tug of war a push or a pull? (a) a pull (b) a push
25. 25.⚖️ A lever balances when … (a) both weights are equal (b) turning effects match (c) the fulcrum moves (d) the bar is short
26. 26.⚖️ A lever bar balances. The load is 720 N at 20 cm from the fulcrum. The effort is 180 N at ? cm from the fulcrum on the other side. What is the missing distance in centimetres?
27. 27.⚖️ A lever bar balances. The load is 240 N at ? cm from the fulcrum. The effort is 80 N at 30 cm from the fulcrum on the other side. What is the missing distance in centimetres?
28. 28.🪝 Fixed or movable pulley: which one makes you pull 2× rope? (a) a fixed pulley (b) a movable pulley
29. 29.🏋️ Can a simple machine reduce the work done? (a) only on Mondays (b) no, work stays the same (c) yes, always (d) yes, by half
30. 30.True or false: a tyre with deep treads gives less friction. (a) False (b) True
31. 31.⚖️ To lift a heavy rock with a crowbar more easily, push … (a) on the fulcrum (b) on the rock (c) far from the fulcrum (d) near the fulcrum
32. 32.⚖️ Along a straight bar, measured from the left end, the effort is at 20 cm, the fulcrum at 30 cm and the load at 50 cm. Which class of lever is it? (a) class 3 (b) class 2 (c) class 1
33. 33.⚖️ A seesaw balances. Zoya (400 N) sits ? m from the pivot on one side; Ravi (400 N) sits 2 m from the pivot on the other side. What is the missing distance in metres?
34. 34.⚖️ Which class of lever is a broom when sweeping? (a) class 1 (b) class 3 (c) class 2
35. 35.💪 In a tug of war, one team pulls left with 60 N and the other pulls right with 15 N. What is the size of the net force, in newtons?
36. 36.🏋️ Pushing a crate 10 m took 3100 J of work. What force was used, in newtons?
37. 37.True or false: pressing a doorbell is a pull. (a) False (b) True
38. 38.True or false: powder on a carrom board gives more friction. (a) False (b) True
39. 39.🔍 Which is the odd one out? (a) a grippy rubber sole (b) powder on a carrom board (c) a rough doormat (d) a box pushed on carpet
40. 40.⚖️ A lever bar balances. The load is 180 N at 20 cm from the fulcrum. The effort is 180 N at ? cm from the fulcrum on the other side. What is the missing distance in centimetres?

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