Engineering Worksheet: Part 2 Test

Engineering lesson 16: Part 2 test: forces and machines · Set 521 · 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.💪 Is a tug of war a push or a pull? (a) a push (b) a pull
2. 2.💪 Which force pulls everything towards the Earth? (a) wind (b) gravity (c) magnetism (d) friction
3. 3.🪝 More rope sections holding a load means … (a) no change (b) less effort needed (c) more effort needed (d) the load floats
4. 4.🛞 Is friction helpful or a problem here: shoe soles wearing out? (a) helpful (b) a problem
5. 5.🔍 Which is the odd one out? (a) chalk on a gym bar (b) powder on a carrom board (c) a wheel on ball bearings (d) a smooth steel slide
6. 6.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 8 N, ice 1 N, a wooden plank 3 N, a carpet 6 N. Which surface gave the least friction? (a) a carpet (b) ice (c) a wooden plank (d) sandpaper
7. 7.⚖️ A seesaw balances. Zoya (? N) sits 2 m from the pivot on one side; Kabir (200 N) sits 4 m from the pivot on the other side. What is the missing weight in newtons?
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.True or false: a nutcracker is a class 3 lever (effort in the middle). (a) True (b) False
10. 10.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 9 N, ice 1 N, a glass sheet 2 N, a wooden plank 5 N. Which surface gave the most friction? (a) a glass sheet (b) ice (c) sandpaper (d) a wooden plank
11. 11.💪 Two children push a box to the right, one with 20 N and the other with 35 N. What is the net (total) force on the box, in newtons?
12. 12.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 10 N, ice 3 N, a glass sheet 6 N, a wooden plank 9 N. How many newtons more were needed on sandpaper than on ice?
13. 13.⚖️ Which class of lever is a wheelbarrow? (a) class 2 (b) class 3 (c) class 1
14. 14.⚖️ Along a straight bar, measured from the left end, the effort is at 0 cm, the fulcrum at 50 cm and the load at 40 cm. Which class of lever is it? (a) class 2 (b) class 3 (c) class 1
15. 15.⚖️ Going along a lever from one end to the other, the order is: fulcrum, effort, load. Which class of lever is it? (a) class 3 (b) class 2 (c) class 1
16. 16.⚖️ Which class of lever is a nutcracker? (a) class 1 (b) class 2 (c) class 3
17. 17.🏋️ Can a simple machine reduce the work done? (a) only on Mondays (b) yes, by half (c) no, work stays the same (d) yes, always
18. 18.True or false: a lemon squeezer is a class 3 lever (effort in the middle). (a) False (b) True
19. 19.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 10 N, sandpaper 11 N, ice 3 N, a wooden plank 7 N. How many newtons more were needed on sandpaper than on ice?
20. 20.⚖️ A lever bar balances. The load is 150 N at ? cm from the fulcrum. The effort is 150 N at 30 cm from the fulcrum on the other side. What is the missing distance in centimetres?
21. 21.⚖️ Along a straight bar, measured from the left end, the effort is at 30 cm, the fulcrum at 80 cm and the load at 40 cm. Which class of lever is it? (a) class 1 (b) class 2 (c) class 3
22. 22.⚖️ A seesaw balances. Ravi (390 N) sits ? m from the pivot on one side; Meena (260 N) sits 3 m from the pivot on the other side. What is the missing distance in metres?
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 wooden plank 6 N, sandpaper 7 N. Which surface gave the most friction? (a) a glass sheet (b) ice (c) sandpaper (d) a wooden plank
24. 24.🛞 More or less friction: a grippy rubber sole? (a) more friction (b) less friction
25. 25.🏋️ A smooth ramp is 15 m long and rises 3 m. What effort pushes a 500 N box up it, in newtons? (ideal ramp, no friction)
26. 26.True or false: a tyre with deep treads gives less friction. (a) True (b) False
27. 27.Which of these is a lever? (a) a steering wheel (b) a wheelchair ramp (c) a well-bucket rope wheel (d) a bottle opener
28. 28.True or false: a pair of pliers is a class 3 lever (effort in the middle). (a) True (b) False
29. 29.⚖️ A seesaw balances. Ravi (120 N) sits 2 m from the pivot on one side; Arjun (240 N) sits ? m from the pivot on the other side. What is the missing distance in metres?
30. 30.💪 Is pressing a doorbell a push or a pull? (a) a push (b) a pull
31. 31.💪 Which force is at work: an apple falls down? (a) muscular force (b) friction (c) gravity (d) magnetic force
32. 32.🔍 Which is the odd one out? (a) a well-bucket rope wheel (b) a flagpole rope wheel (c) a wheelchair ramp (d) a window blind cord
33. 33.⚖️ In a class 1 lever, what is in the middle? (a) the fulcrum (b) the load (c) nothing (d) the effort
34. 34.🏋️ A force of 230 N pushes a cart 1 m along the floor. How much work is done, in joules?
35. 35.True or false: a lemon squeezer is a class 2 lever (load in the middle). (a) True (b) False
36. 36.⚖️ A seesaw balances. Kabir (? N) sits 3 m from the pivot on one side; Zoya (420 N) sits 2 m from the pivot on the other side. What is the missing weight in newtons?
37. 37.⚖️ A lever bar balances. The load is 60 N at 10 cm from the fulcrum. The effort is 10 N at ? cm from the fulcrum on the other side. What is the missing distance in centimetres?
38. 38.🪝 A pulley system has 3 rope sections holding up the load. To lift the load by 3 m, how many metres of rope must you pull?
39. 39.True or false: opening a drawer is a push. (a) False (b) True
40. 40.🏋️ A force of 410 N pushes a cart 9 m along the floor. How much work is done, in joules?

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