Engineering Worksheet: Part 2 Test

Engineering lesson 16: Part 2 test: forces and machines · Set 514 · 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.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 3 N, a wooden plank 5 N, a carpet 7 N, sandpaper 10 N. Which surface gave the least friction? (a) a carpet (b) sandpaper (c) a glass sheet (d) a wooden plank
2. 2.True or false: a wheel on ball bearings gives more friction. (a) False (b) True
3. 3.Which of these is a lever? (a) a well-bucket rope wheel (b) a jar lid (c) a steering wheel (d) a crowbar
4. 4.💪 Two equal forces push on a box from opposite sides. They are … (a) unbalanced (b) balanced (c) doubled (d) gravity
5. 5.🏋️ Work is done when a force moves something … (a) without moving it (b) very slowly (c) through a distance (d) only upwards
6. 6.⚙️ A wedge is … (a) a wheel on a rod (b) two ramps back to back (c) a bar on a pivot (d) a rope on a wheel
7. 7.True or false: a bottle opener is a class 3 lever (effort in the middle). (a) True (b) False
8. 8.⚖️ On a seesaw, a heavier child should sit … (a) farther from the pivot (b) on the pivot (c) anywhere (d) closer to the pivot
9. 9.⚖️ Along a straight bar, measured from the left end, the effort is at 20 cm, the fulcrum at 10 cm and the load at 30 cm. Which class of lever is it? (a) class 3 (b) class 1 (c) class 2
10. 10.⚖️ A lever bar balances. The load is ? N at 20 cm from the fulcrum. The effort is 60 N at 70 cm from the fulcrum on the other side. What is the missing force in newtons?
11. 11.⚖️ To lift a heavy rock with a crowbar more easily, push … (a) on the rock (b) far from the fulcrum (c) near the fulcrum (d) on the fulcrum
12. 12.🏋️ A force of 250 N did 1500 J of work. How many metres did the object move?
13. 13.🏋️ A machine lifts a load of 400 N when you push with 100 N. What is its mechanical advantage (MA)?
14. 14.⚖️ A seesaw balances. Asha (? N) sits 3 m from the pivot on one side; Kabir (330 N) sits 3 m from the pivot on the other side. What is the missing weight in newtons?
15. 15.🪝 A pulley system lifts a 400 N load with an effort of 100 N. What is its mechanical advantage (MA)?
16. 16.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 8 N, ice 1 N, a glass sheet 3 N, a carpet 4 N. Which surface gave the most friction? (a) a glass sheet (b) ice (c) sandpaper (d) a carpet
17. 17.💪 Is hitting a cricket ball a push or a pull? (a) a pull (b) a push
18. 18.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 1 N, a glass sheet 2 N, a carpet 3 N, sandpaper 4 N. Which surface gave the most friction? (a) a glass sheet (b) ice (c) a carpet (d) sandpaper
19. 19.⚖️ Which class of lever is a nutcracker? (a) class 3 (b) class 1 (c) class 2
20. 20.💪 Two children push a box to the right, one with 80 N and the other with 20 N. What is the net (total) force on the box, in newtons?
21. 21.🏋️ A force of 130 N pushes a cart 6 m along the floor. How much work is done, in joules?
22. 22.⚖️ A seesaw balances. Zoya (680 N) sits 4 m from the pivot on one side; Arjun (680 N) sits ? m from the pivot on the other side. What is the missing distance in metres?
23. 23.⚖️ A lever bar balances. The load is 560 N at 20 cm from the fulcrum. The effort is 140 N at ? cm from the fulcrum on the other side. What is the missing distance in centimetres?
24. 24.🛞 Friction acts … (a) only on ice (b) only upwards (c) with the motion (d) against the motion
25. 25.⚖️ Going along a lever from one end to the other, the order is: fulcrum, load, effort. Which class of lever is it? (a) class 1 (b) class 3 (c) class 2
26. 26.True or false: a beam balance is a class 1 lever (fulcrum in the middle). (a) True (b) False
27. 27.⚖️ A lever bar balances. The load is 300 N at ? cm from the fulcrum. The effort is 120 N at 100 cm from the fulcrum on the other side. What is the missing distance in centimetres?
28. 28.🏋️ A 10 kg box is lifted straight up by 5 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
29. 29.🏋️ Mechanical advantage (MA) = … (a) load + effort (b) load ÷ effort (c) effort ÷ load (d) load × effort
30. 30.🔍 Which is the odd one out? (a) a smooth steel slide (b) a wet tiled floor (c) a grippy rubber sole (d) powder on a carrom board
31. 31.True or false: a lemon squeezer is a class 2 lever (load in the middle). (a) False (b) True
32. 32.True or false: a tug of war is a pull. (a) True (b) False
33. 33.Which of these is a lever? (a) a nut and bolt (b) a bottle cap (c) a wood screw (d) a nutcracker
34. 34.🪝 Fixed or movable pulley: which one stays in one place? (a) a movable pulley (b) a fixed pulley
35. 35.⚖️ Turning effect = force × … (a) time taken (b) distance from fulcrum (c) colour of bar (d) mass of fulcrum
36. 36.🪝 A pulley system lifts a 60 N load with an effort of 30 N. What is its mechanical advantage (MA)?
37. 37.⚖️ A lever bar balances. The load is 240 N at ? cm from the fulcrum. The effort is 60 N at 40 cm from the fulcrum on the other side. What is the missing distance in centimetres?
38. 38.Which of these is a wedge? (a) a chisel (b) a window blind cord (c) a bottle opener (d) a wood screw
39. 39.Which of these is an inclined plane? (a) a bottle cap (b) a jar lid (c) a truck loading ramp (d) a door stopper
40. 40.⚖️ A lever bar balances. The load is 160 N at 10 cm from the fulcrum. The effort is ? N at 20 cm from the fulcrum on the other side. What is the missing force in newtons?

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