Engineering Worksheet: Part 2 Test

Engineering lesson 16: Part 2 test: forces and machines · Set 43 · 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.💪 A bag has a mass of 40 kg. Taking 1 kg to weigh about 10 N, what is its weight in newtons?
2. 2.⚙️ A screw is really … (a) a kind of wheel (b) a tiny pulley (c) a bent lever (d) a ramp wrapped round
3. 3.🏋️ A 9 kg box is lifted straight up by 2 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
4. 4.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 5 N, a carpet 7 N, sandpaper 9 N, a glass sheet 1 N. Which surface gave the most friction? (a) a glass sheet (b) a carpet (c) sandpaper (d) a wooden plank
5. 5.⚖️ A seesaw balances. Kabir (510 N) sits ? m from the pivot on one side; Asha (680 N) sits 3 m from the pivot on the other side. What is the missing distance in metres?
6. 6.🪝 Fixed or movable pulley: which one halves the effort? (a) a fixed pulley (b) a movable pulley
7. 7.💪 Which force is at work: a compass needle turns? (a) friction (b) gravity (c) magnetic force (d) muscular force
8. 8.💪 Two children push a box to the right, one with 55 N and the other with 45 N. What is the net (total) force on the box, in newtons?
9. 9.True or false: a fixed pulley needs effort = load. (a) False (b) True
10. 10.🪝 A wheel and axle is a big wheel fixed to … (a) a flat ramp (b) a loose rope (c) a sharp wedge (d) a smaller rod (axle)
11. 11.Which of these is a wheel and axle? (a) a bottle cap (b) a knife edge (c) a round doorknob (d) a nutcracker
12. 12.🔍 Which is the odd one out? (a) powder on a carrom board (b) a smooth steel slide (c) oil on a squeaky hinge (d) a tyre with deep treads
13. 13.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 6 N, a carpet 9 N, sandpaper 10 N, ice 2 N. Which surface gave the most friction? (a) sandpaper (b) a carpet (c) ice (d) a wooden plank
14. 14.⚖️ In a class 1 lever, what is in the middle? (a) the effort (b) the fulcrum (c) the load (d) nothing
15. 15.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 5 N, a wooden plank 9 N, a carpet 11 N, ice 3 N. Which surface gave the least friction? (a) a carpet (b) a wooden plank (c) ice (d) a glass sheet
16. 16.⚖️ A seesaw balances. Asha (160 N) sits ? m from the pivot on one side; Meena (480 N) sits 1 m from the pivot on the other side. What is the missing distance in metres?
17. 17.🏋️ A smooth ramp is 2 m long and rises 1 m. What effort pushes a 1400 N box up it, in newtons? (ideal ramp, no friction)
18. 18.🛞 Why are tyres made with deep treads? (a) to save rubber (b) to go slower (c) to grip the road (d) to look nice
19. 19.⚖️ A lever bar balances. The load is 400 N at ? cm from the fulcrum. The effort is 100 N at 40 cm from the fulcrum on the other side. What is the missing distance in centimetres?
20. 20.⚙️ Which simple machine is a chisel? (a) lever (b) pulley (c) inclined plane (d) wedge
21. 21.💪 Is closing a drawer a push or a pull? (a) a push (b) a pull
22. 22.🛞 More or less friction: powder on a carrom board? (a) less friction (b) more friction
23. 23.True or false: a movable pulley is on a flagpole top. (a) False (b) True
24. 24.⚖️ Which class of lever is a crowbar? (a) class 3 (b) class 1 (c) class 2
25. 25.🪝 A bucket weighing 60 N is lifted with a single fixed pulley at the top of a well. What effort is needed, in newtons? (ideal pulley, no friction)
26. 26.Which of these is caused by muscular force? (a) a magnet picks up pins (b) squeezing a lemon (c) a river flows downhill (d) brakes stop a bicycle
27. 27.💪 Is opening a drawer a push or a pull? (a) a push (b) a pull
28. 28.🪝 A pulley system lifts an 810 N load with an effort of 270 N. What is its mechanical advantage (MA)?
29. 29.🏋️ Can a simple machine reduce the work done? (a) no, work stays the same (b) only on Mondays (c) yes, always (d) yes, by half
30. 30.🏋️ A 6 kg box is lifted straight up by 4 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
31. 31.⚖️ A seesaw balances. Arjun (360 N) sits 4 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?
32. 32.⚖️ Which class of lever is a fishing rod? (a) class 2 (b) class 1 (c) class 3
33. 33.🛞 How can we reduce friction in a machine? (a) add sand (b) press parts harder (c) make parts rough (d) oil the moving parts
34. 34.🛞 Is friction helpful or a problem here: a door hinge squeaking? (a) a problem (b) helpful
35. 35.🏋️ A longer ramp to the same height needs … (a) the same effort (b) more effort (c) no effort (d) less effort
36. 36.🛞 More or less friction: a grippy rubber sole? (a) more friction (b) less friction
37. 37.🛞 Is friction helpful or a problem here: shoe soles wearing out? (a) a problem (b) helpful
38. 38.Which of these is caused by magnetic force? (a) a river flows downhill (b) brakes stop a bicycle (c) a thrown ball comes down (d) a compass needle turns
39. 39.⚖️ A lever bar balances. The load is ? N at 30 cm from the fulcrum. The effort is 60 N at 80 cm from the fulcrum on the other side. What is the missing force in newtons?
40. 40.True or false: plucking a mango is a push. (a) False (b) True

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