Engineering Worksheet: Part 2 Test

Engineering lesson 16: Part 2 test: forces and machines · Set 332 · 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.🛞 How can we reduce friction in a machine? (a) make parts rough (b) press parts harder (c) oil the moving parts (d) add sand
2. 2.🪝 A bucket weighing 190 N is lifted with a single fixed pulley at the top of a well. What effort is needed, in newtons? (ideal pulley, no friction)
3. 3.🏋️ Mechanical advantage (MA) = … (a) load × effort (b) effort ÷ load (c) load + effort (d) load ÷ effort
4. 4.⚖️ A lever balances when … (a) both weights are equal (b) turning effects match (c) the bar is short (d) the fulcrum moves
5. 5.⚙️ Which simple machine is a steering wheel? (a) wheel and axle (b) pulley (c) lever (d) screw
6. 6.True or false: pressing a doorbell is a push. (a) True (b) False
7. 7.🪝 A pulley system lifts an 810 N load with an effort of 270 N. What is its mechanical advantage (MA)?
8. 8.True or false: pushing a trolley is a pull. (a) True (b) False
9. 9.🪝 More rope sections holding a load means … (a) no change (b) the load floats (c) more effort needed (d) less effort needed
10. 10.🔍 Which is the odd one out? (a) a wheel on ball bearings (b) a grippy rubber sole (c) a rough doormat (d) sand on a slippery path
11. 11.Which of these is a lever? (a) a steering wheel (b) a nutcracker (c) a well-bucket rope wheel (d) the tip of a nail
12. 12.💪 Which force is at work: brakes stop a bicycle? (a) gravity (b) magnetic force (c) muscular force (d) friction
13. 13.💪 A bag has a mass of 41 kg. Taking 1 kg to weigh about 10 N, what is its weight in newtons?
14. 14.⚙️ Most simple machines make work easier by letting us … (a) use a smaller force (b) switch off gravity (c) stop all friction (d) make new energy
15. 15.⚖️ Along a straight bar, measured from the left end, the effort is at 40 cm, the fulcrum at 10 cm and the load at 0 cm. Which class of lever is it? (a) class 2 (b) class 3 (c) class 1
16. 16.⚖️ Along a straight bar, measured from the left end, the effort is at 80 cm, the fulcrum at 20 cm and the load at 40 cm. Which class of lever is it? (a) class 1 (b) class 2 (c) class 3
17. 17.⚖️ Which class of lever is a crowbar? (a) class 1 (b) class 3 (c) class 2
18. 18.True or false: a pair of pliers is a class 2 lever (load in the middle). (a) False (b) True
19. 19.True or false: a movable pulley is on a flagpole top. (a) True (b) False
20. 20.🏋️ A 15 kg box is lifted straight up by 4 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
21. 21.⚖️ Going along a lever from one end to the other, the order is: effort, fulcrum, load. Which class of lever is it? (a) class 2 (b) class 3 (c) class 1
22. 22.🏋️ A 20 kg box is lifted straight up by 2 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
23. 23.⚖️ A seesaw balances. Arjun (? N) sits 3 m from the pivot on one side; Asha (540 N) sits 1 m from the pivot on the other side. What is the missing weight in newtons?
24. 24.🏋️ Work is done when a force moves something … (a) through a distance (b) without moving it (c) only upwards (d) very slowly
25. 25.🛞 Is friction helpful or a problem here: writing with a pencil? (a) helpful (b) a problem
26. 26.⚖️ Along a straight bar, measured from the left end, the effort is at 50 cm, the fulcrum at 10 cm and the load at 0 cm. Which class of lever is it? (a) class 3 (b) class 2 (c) class 1
27. 27.True or false: closing a drawer is a push. (a) False (b) True
28. 28.🔍 Which is the odd one out? (a) the tip of a nail (b) a crowbar (c) a seesaw (d) a bottle opener
29. 29.⚖️ In a class 1 lever, what is in the middle? (a) the load (b) the effort (c) nothing (d) the fulcrum
30. 30.⚖️ A lever bar balances. The load is 120 N at 20 cm from the fulcrum. The effort is 120 N at ? cm from the fulcrum on the other side. What is the missing distance in centimetres?
31. 31.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 5 N, a carpet 6 N, sandpaper 8 N, ice 4 N. How many newtons more were needed on sandpaper than on ice?
32. 32.🛞 More or less friction: chalk on a gym bar? (a) less friction (b) more friction
33. 33.💪 Is kicking a football a push or a pull? (a) a pull (b) a push
34. 34.True or false: a lemon squeezer is a class 2 lever (load in the middle). (a) False (b) True
35. 35.🔍 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
36. 36.🔍 Which is the odd one out? (a) a claw hammer on a nail (b) a nutcracker (c) a wheelchair ramp (d) a bottle opener
37. 37.⚖️ A seesaw balances. Ravi (330 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?
38. 38.🛞 Which surface gives the MOST friction to a sliding block? (a) glass (b) polished marble (c) ice (d) sandpaper
39. 39.⚙️ Which simple machine is a claw hammer on a nail? (a) wedge (b) pulley (c) lever (d) wheel and axle
40. 40.🏋️ A force of 200 N did 1200 J of work. How many metres did the object move?

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