Engineering Worksheet: Part 2 Test

Engineering lesson 16: Part 2 test: forces and machines · Set 680 · 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 90 cm, the fulcrum at 60 cm and the load at 30 cm. Which class of lever is it? (a) class 2 (b) class 1 (c) class 3
2. 2.🔍 Which is the odd one out? (a) sand on a slippery path (b) a tyre with deep treads (c) a wet tiled floor (d) chalk on a gym bar
3. 3.🏋️ In which unit is work measured? (a) watt hour (b) joule (J) (c) newton (N) (d) metre (m)
4. 4.True or false: a tyre with deep treads gives less friction. (a) True (b) False
5. 5.⚖️ A lever bar balances. The load is 60 N at 20 cm from the fulcrum. The effort is 40 N at ? cm from the fulcrum on the other side. What is the missing distance in centimetres?
6. 6.🪝 A bucket weighing 320 N is lifted with a single fixed pulley at the top of a well. What effort is needed, in newtons? (ideal pulley, no friction)
7. 7.💪 Is closing a drawer a push or a pull? (a) a pull (b) a push
8. 8.Which of these is an inclined plane? (a) a knife edge (b) a screw jack (c) a bottle cap (d) a road up a hill
9. 9.💪 Two children push a box to the right, one with 65 N and the other with 40 N. What is the net (total) force on the box, in newtons?
10. 10.⚖️ A lever bar balances. The load is 60 N at ? cm from the fulcrum. The effort is 20 N at 60 cm from the fulcrum on the other side. What is the missing distance in centimetres?
11. 11.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 2 N, a glass sheet 4 N, a carpet 7 N, sandpaper 10 N. Which surface gave the least friction? (a) a glass sheet (b) a carpet (c) sandpaper (d) ice
12. 12.🏋️ Can a simple machine reduce the work done? (a) no, work stays the same (b) yes, always (c) yes, by half (d) only on Mondays
13. 13.🪝 A pulley system lifts a 500 N load with an effort of 250 N. What is its mechanical advantage (MA)?
14. 14.💪 A cart is pulled to the right with 30 N and to the left with 45 N. Which way does the net force act? (a) to the left (b) no net force (c) to the right
15. 15.🏋️ Work is done when a force moves something … (a) through a distance (b) without moving it (c) only upwards (d) very slowly
16. 16.True or false: powder on a carrom board gives less friction. (a) True (b) False
17. 17.🪝 A well winch has a handle (wheel) of radius 20 cm turning an axle of radius 5 cm. What is its mechanical advantage (MA)?
18. 18.🛞 How can we reduce friction in a machine? (a) make parts rough (b) press parts harder (c) add sand (d) oil the moving parts
19. 19.⚖️ A seesaw balances. Kabir (120 N) sits 1 m from the pivot on one side; Asha (? N) sits 1 m from the pivot on the other side. What is the missing weight in newtons?
20. 20.True or false: a fixed pulley is on a flagpole top. (a) False (b) True
21. 21.💪 Two equal forces push on a box from opposite sides. They are … (a) unbalanced (b) balanced (c) doubled (d) gravity
22. 22.⚖️ A lever bar balances. The load is 360 N at 30 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?
23. 23.⚖️ On a seesaw, a heavier child should sit … (a) closer to the pivot (b) on the pivot (c) anywhere (d) farther from the pivot
24. 24.🏋️ A 4 kg box is lifted straight up by 4 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
25. 25.⚖️ Which class of lever is a bottle opener? (a) class 3 (b) class 1 (c) class 2
26. 26.🪝 A pulley system lifts a 600 N load with an effort of 150 N. What is its mechanical advantage (MA)?
27. 27.True or false: a pair of kitchen tongs is a class 1 lever (fulcrum in the middle). (a) False (b) True
28. 28.True or false: skating on ice gives more friction. (a) False (b) True
29. 29.⚖️ Turning effect = force × … (a) distance from fulcrum (b) time taken (c) colour of bar (d) mass of fulcrum
30. 30.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 4 N, a glass sheet 5 N, a wooden plank 6 N, sandpaper 7 N. How many newtons more were needed on sandpaper than on ice?
31. 31.🛞 Is friction helpful or a problem here: writing with a pencil? (a) a problem (b) helpful
32. 32.🛞 More or less friction: oil on a squeaky hinge? (a) more friction (b) less friction
33. 33.⚖️ In a class 3 lever, what is in the middle? (a) the fulcrum (b) the effort (c) the load (d) the pulley
34. 34.⚖️ A seesaw balances. Asha (? N) sits 1 m from the pivot on one side; Arjun (140 N) sits 2 m from the pivot on the other side. What is the missing weight in newtons?
35. 35.🏋️ A machine lifts a load of 60 N when you push with 20 N. What is its mechanical advantage (MA)?
36. 36.⚖️ Which class of lever is a beam balance? (a) class 2 (b) class 1 (c) class 3
37. 37.Which of these is caused by friction? (a) a river flows downhill (b) rubbing hands warms them (c) a compass needle turns (d) a magnet picks up pins
38. 38.True or false: a water tap handle is a wedge. (a) False (b) True
39. 39.🏋️ A longer ramp to the same height needs … (a) the same effort (b) no effort (c) less effort (d) more effort
40. 40.⚙️ How many simple machines are there in the usual list? (a) 12 (b) 3 (c) 10 (d) 6

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