Engineering Worksheet: Part 2 Test

Engineering lesson 16: Part 2 test: forces and machines · Set 165 · 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.🪝 More rope sections holding a load means … (a) no change (b) less effort needed (c) the load floats (d) more effort needed
2. 2.🪝 Fixed or movable pulley: which one halves the effort? (a) a fixed pulley (b) a movable pulley
3. 3.💪 In which unit do we measure force? (a) newton (N) (b) metre (m) (c) litre (L) (d) second (s)
4. 4.Which of these is caused by friction? (a) a river flows downhill (b) rain falls to the ground (c) a fridge magnet sticks (d) a rolling ball slows
5. 5.True or false: pressing a doorbell is a push. (a) False (b) True
6. 6.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 4 N, a carpet 7 N, ice 1 N, a glass sheet 3 N. Which surface gave the most friction? (a) a carpet (b) a glass sheet (c) ice (d) a wooden plank
7. 7.🪝 A load of 720 N hangs from a pulley system in which 4 rope sections hold up the load. What effort is needed, in newtons? (ideal pulleys)
8. 8.Which of these is an inclined plane? (a) a road up a hill (b) a steering wheel (c) a water tap handle (d) a nutcracker
9. 9.🛞 More or less friction: a wet tiled floor? (a) less friction (b) more friction
10. 10.💪 Is hitting a cricket ball a push or a pull? (a) a push (b) a pull
11. 11.⚖️ Which class of lever is a crowbar? (a) class 3 (b) class 1 (c) class 2
12. 12.⚖️ In a class 1 lever, what is in the middle? (a) the load (b) nothing (c) the fulcrum (d) the effort
13. 13.True or false: a movable pulley stays in one place. (a) False (b) True
14. 14.⚖️ A seesaw balances. Ravi (400 N) sits ? m from the pivot on one side; Zoya (200 N) sits 4 m from the pivot on the other side. What is the missing distance in metres?
15. 15.⚖️ A lever bar balances. The load is 560 N at 10 cm from the fulcrum. The effort is ? N at 70 cm from the fulcrum on the other side. What is the missing force in newtons?
16. 16.True or false: oil on a squeaky hinge gives less friction. (a) True (b) False
17. 17.🪝 A wheel and axle is a big wheel fixed to … (a) a sharp wedge (b) a flat ramp (c) a smaller rod (axle) (d) a loose rope
18. 18.⚙️ Which simple machine is a knife edge? (a) wedge (b) pulley (c) wheel and axle (d) screw
19. 19.🔍 Which is the odd one out? (a) skating on ice (b) a box pushed on carpet (c) powder on a carrom board (d) a smooth steel slide
20. 20.🪝 A load of 300 N hangs from a pulley system in which 3 rope sections hold up the load. What effort is needed, in newtons? (ideal pulleys)
21. 21.🪝 A load of 480 N hangs from a pulley system in which 3 rope sections hold up the load. What effort is needed, in newtons? (ideal pulleys)
22. 22.⚖️ A seesaw balances. Meena (340 N) sits 1 m from the pivot on one side; Arjun (? N) sits 2 m from the pivot on the other side. What is the missing weight in newtons?
23. 23.💪 A box weighs 190 N. Taking 1 kg to weigh about 10 N, what is its mass in kilograms?
24. 24.True or false: a movable pulley only changes direction. (a) True (b) False
25. 25.🛞 Is friction helpful or a problem here: a door hinge squeaking? (a) a problem (b) helpful
26. 26.Which of these is caused by muscular force? (a) a thrown ball comes down (b) a compass needle turns (c) a magnet picks up pins (d) lifting a school bag
27. 27.💪 Is kicking a football a push or a pull? (a) a pull (b) a push
28. 28.🛞 More or less friction: a box pushed on carpet? (a) less friction (b) more friction
29. 29.Which of these is caused by friction? (a) pedalling a cycle (b) rain falls to the ground (c) shoes grip the floor (d) an apple falls down
30. 30.⚖️ A lever balances when … (a) the fulcrum moves (b) both weights are equal (c) turning effects match (d) the bar is short
31. 31.⚖️ Going along a lever from one end to the other, the order is: load, effort, fulcrum. Which class of lever is it? (a) class 3 (b) class 1 (c) class 2
32. 32.🏋️ Mechanical advantage (MA) = … (a) load + effort (b) effort ÷ load (c) load × effort (d) load ÷ effort
33. 33.⚙️ Which simple machine is a round doorknob? (a) lever (b) wheel and axle (c) wedge (d) screw
34. 34.⚖️ A lever bar balances. The load is 560 N at 20 cm from the fulcrum. The effort is ? N at 70 cm from the fulcrum on the other side. What is the missing force in newtons?
35. 35.⚖️ Along a straight bar, measured from the left end, the effort is at 10 cm, the fulcrum at 40 cm and the load at 70 cm. Which class of lever is it? (a) class 1 (b) class 3 (c) class 2
36. 36.⚖️ A seesaw balances. Asha (110 N) sits ? m from the pivot on one side; Arjun (220 N) sits 1 m from the pivot on the other side. What is the missing distance in metres?
37. 37.⚖️ Along a straight bar, measured from the left end, the effort is at 30 cm, the fulcrum at 40 cm and the load at 70 cm. Which class of lever is it? (a) class 3 (b) class 2 (c) class 1
38. 38.🛞 Is friction helpful or a problem here: striking a matchstick? (a) a problem (b) helpful
39. 39.True or false: a wood screw is a lever. (a) False (b) True
40. 40.🏋️ A 16 kg box is lifted straight up by 5 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?

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