Engineering Worksheet: Part 2 Test

Engineering lesson 16: Part 2 test: forces and machines · Set 803 · 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 80 cm, the fulcrum at 10 cm and the load at 50 cm. Which class of lever is it? (a) class 3 (b) class 2 (c) class 1
2. 2.🏋️ A machine lifts a load of 90 N when you push with 30 N. What is its mechanical advantage (MA)?
3. 3.🛞 More or less friction: sand on a slippery path? (a) more friction (b) less friction
4. 4.⚖️ What is the pivot point of a lever called? (a) the effort (b) the axle (c) the load (d) the fulcrum
5. 5.⚖️ On a seesaw, a heavier child should sit … (a) anywhere (b) closer to the pivot (c) farther from the pivot (d) on the pivot
6. 6.💪 Two children push a box to the right, one with 85 N and the other with 10 N. What is the net (total) force on the box, in newtons?
7. 7.Which of these is a wheel and axle? (a) a wheelchair ramp (b) a jar lid (c) a round doorknob (d) an axe blade
8. 8.True or false: pushing a trolley is a push. (a) True (b) False
9. 9.🔍 Which is the odd one out? (a) a smooth steel slide (b) chalk on a gym bar (c) a grippy rubber sole (d) a tyre with deep treads
10. 10.🪝 Fixed or movable pulley: which one hangs on the rope loop? (a) a movable pulley (b) a fixed pulley
11. 11.Which of these is caused by gravity? (a) pedalling a cycle (b) a river flows downhill (c) brakes stop a bicycle (d) a compass needle turns
12. 12.🛞 Is friction helpful or a problem here: machine parts heating up? (a) a problem (b) helpful
13. 13.💪 Two equal forces push on a box from opposite sides. They are … (a) doubled (b) balanced (c) gravity (d) unbalanced
14. 14.🏋️ A force of 250 N pushes a cart 3 m along the floor. How much work is done, in joules?
15. 15.⚖️ A seesaw balances. Zoya (? N) sits 3 m from the pivot on one side; Arjun (510 N) sits 1 m from the pivot on the other side. What is the missing weight in newtons?
16. 16.⚖️ A seesaw balances. Zoya (? N) sits 3 m from the pivot on one side; Kabir (570 N) sits 1 m from the pivot on the other side. What is the missing weight in newtons?
17. 17.💪 Is pushing a trolley a push or a pull? (a) a pull (b) a push
18. 18.💪 Is a tug of war a push or a pull? (a) a push (b) a pull
19. 19.💪 Two children push a box to the right, one with 50 N and the other with 90 N. What is the net (total) force on the box, in newtons?
20. 20.⚖️ A lever bar balances. The load is 200 N at 10 cm from the fulcrum. The effort is 20 N at ? cm from the fulcrum on the other side. What is the missing distance in centimetres?
21. 21.Which of these is caused by gravity? (a) a compass needle turns (b) a magnet picks up pins (c) an apple falls down (d) brakes stop a bicycle
22. 22.⚖️ A lever bar balances. The load is 300 N at ? cm from the fulcrum. The effort is 250 N at 60 cm from the fulcrum on the other side. What is the missing distance in centimetres?
23. 23.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 10 N, a glass sheet 3 N, a wooden plank 6 N, a carpet 7 N. Which surface gave the least friction? (a) sandpaper (b) a glass sheet (c) a carpet (d) a wooden plank
24. 24.⚖️ Which class of lever is a lemon squeezer? (a) class 3 (b) class 1 (c) class 2
25. 25.🛞 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 6 N, sandpaper 9 N. Which surface gave the least friction? (a) a glass sheet (b) sandpaper (c) ice (d) a carpet
26. 26.🛞 Friction acts … (a) with the motion (b) against the motion (c) only on ice (d) only upwards
27. 27.💪 Two children push a box to the right, one with 35 N and the other with 40 N. What is the net (total) force on the box, in newtons?
28. 28.True or false: drawing up a well bucket is a push. (a) True (b) False
29. 29.⚖️ Turning effect = force × … (a) mass of fulcrum (b) colour of bar (c) distance from fulcrum (d) time taken
30. 30.🛞 More or less friction: skating on ice? (a) less friction (b) more friction
31. 31.🔍 Which is the odd one out? (a) oil on a squeaky hinge (b) powder on a carrom board (c) chalk on a gym bar (d) skating on ice
32. 32.🛞 Is friction helpful or a problem here: a knot holding a rope? (a) a problem (b) helpful
33. 33.💪 Which can a force NOT do? (a) change its shape (b) stop it moving (c) change its colour (d) start it moving
34. 34.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 9 N, sandpaper 13 N, a glass sheet 2 N, a wooden plank 5 N. Which surface gave the least friction? (a) sandpaper (b) a glass sheet (c) a wooden plank (d) a carpet
35. 35.🏋️ A force of 120 N pushes a cart 6 m along the floor. How much work is done, in joules?
36. 36.🏋️ Work is done when a force moves something … (a) very slowly (b) without moving it (c) only upwards (d) through a distance
37. 37.⚖️ A lever bar balances. The load is ? N at 10 cm from the fulcrum. The effort is 100 N at 70 cm from the fulcrum on the other side. What is the missing force in newtons?
38. 38.🏋️ A smooth ramp is 9 m long and rises 3 m. What effort pushes a 600 N box up it, in newtons? (ideal ramp, no friction)
39. 39.True or false: pushing a trolley is a pull. (a) True (b) False
40. 40.🔍 Which is the odd one out? (a) a rough doormat (b) a grippy rubber sole (c) a wet tiled floor (d) sand on a slippery path

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