Engineering Worksheet: Part 2 Test

Engineering lesson 16: Part 2 test: forces and machines · Set 897 · 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.⚖️ A lever bar balances. The load is ? N at 20 cm from the fulcrum. The effort is 100 N at 80 cm from the fulcrum on the other side. What is the missing force in newtons?
2. 2.🏋️ In which unit is work measured? (a) joule (J) (b) watt hour (c) metre (m) (d) newton (N)
3. 3.⚖️ A seesaw balances. Zoya (? N) sits 2 m from the pivot on one side; Meena (200 N) sits 2 m from the pivot on the other side. What is the missing weight in newtons?
4. 4.⚖️ Along a straight bar, measured from the left end, the effort is at 40 cm, the fulcrum at 60 cm and the load at 30 cm. Which class of lever is it? (a) class 3 (b) class 2 (c) class 1
5. 5.💪 In which unit do we measure force? (a) second (s) (b) metre (m) (c) litre (L) (d) newton (N)
6. 6.💪 Two equal forces push on a box from opposite sides. They are … (a) unbalanced (b) gravity (c) balanced (d) doubled
7. 7.True or false: a movable pulley rises with the load. (a) False (b) True
8. 8.💪 Is drawing up a well bucket a push or a pull? (a) a push (b) a pull
9. 9.💪 A force is a … (a) kind of colour (b) unit of time (c) type of sound (d) push or a pull
10. 10.True or false: a grippy rubber sole gives less friction. (a) True (b) False
11. 11.⚖️ A seesaw balances. Arjun (100 N) sits ? m from the pivot on one side; Meena (100 N) sits 1 m from the pivot on the other side. What is the missing distance in metres?
12. 12.Which of these is a lever? (a) a well winch handle (b) a bottle cap (c) a well-bucket rope wheel (d) a claw hammer on a nail
13. 13.🏋️ A longer ramp to the same height needs … (a) no effort (b) the same effort (c) more effort (d) less effort
14. 14.⚖️ To lift a heavy rock with a crowbar more easily, push … (a) on the rock (b) on the fulcrum (c) near the fulcrum (d) far from the fulcrum
15. 15.🪝 A winch has a wheel of radius 16 cm and an axle of radius 4 cm. What effort on the wheel lifts a 160 N bucket on the axle, in newtons? (ideal)
16. 16.🏋️ Mechanical advantage (MA) = … (a) load + effort (b) load × effort (c) load ÷ effort (d) effort ÷ load
17. 17.🏋️ Pushing a crate 4 m took 1160 J of work. What force was used, in newtons?
18. 18.Which of these is a screw? (a) a wood screw (b) the tip of a nail (c) a knife edge (d) a round doorknob
19. 19.💪 In a tug of war, one team pulls left with 50 N and the other pulls right with 25 N. What is the size of the net force, in newtons?
20. 20.⚙️ How many simple machines are there in the usual list? (a) 6 (b) 10 (c) 3 (d) 12
21. 21.💪 Two children push a box to the right, one with 80 N and the other with 30 N. What is the net (total) force on the box, in newtons?
22. 22.⚖️ A lever balances when … (a) the bar is short (b) turning effects match (c) both weights are equal (d) the fulcrum moves
23. 23.🪝 A wheel and axle is a big wheel fixed to … (a) a flat ramp (b) a sharp wedge (c) a smaller rod (axle) (d) a loose rope
24. 24.💪 Which force is at work: rain falls to the ground? (a) magnetic force (b) muscular force (c) friction (d) gravity
25. 25.🛞 More or less friction: skating on ice? (a) more friction (b) less friction
26. 26.🪝 A pulley system has 1 rope section holding up the load. To lift the load by 7 m, how many metres of rope must you pull?
27. 27.⚖️ A seesaw balances. Ravi (600 N) sits ? m from the pivot on one side; Arjun (150 N) sits 4 m from the pivot on the other side. What is the missing distance in metres?
28. 28.⚖️ Which class of lever is a pair of scissors? (a) class 3 (b) class 2 (c) class 1
29. 29.⚖️ A seesaw balances. Asha (? N) sits 3 m from the pivot on one side; Zoya (330 N) sits 1 m from the pivot on the other side. What is the missing weight in newtons?
30. 30.🏋️ A force of 50 N did 500 J of work. How many metres did the object move?
31. 31.⚖️ Turning effect = force × … (a) time taken (b) colour of bar (c) mass of fulcrum (d) distance from fulcrum
32. 32.🔍 Which is the odd one out? (a) a rough doormat (b) sand on a slippery path (c) a wet tiled floor (d) chalk on a gym bar
33. 33.🛞 Is friction helpful or a problem here: walking without slipping? (a) a problem (b) helpful
34. 34.🏋️ A machine lifts a load of 450 N when you push with 90 N. What is its mechanical advantage (MA)?
35. 35.⚖️ A lever bar balances. The load is 300 N at 40 cm from the fulcrum. The effort is ? N at 60 cm from the fulcrum on the other side. What is the missing force in newtons?
36. 36.🏋️ A force of 300 N pushes a cart 1 m along the floor. How much work is done, in joules?
37. 37.True or false: a beam balance is a class 2 lever (load in the middle). (a) True (b) False
38. 38.💪 Which force is at work: a rolling ball slows? (a) gravity (b) friction (c) magnetic force (d) muscular force
39. 39.Which of these is caused by gravity? (a) a thrown ball comes down (b) a compass needle turns (c) a fridge magnet sticks (d) pedalling a cycle
40. 40.⚖️ A seesaw balances. Asha (? N) sits 2 m from the pivot on one side; Ravi (280 N) sits 3 m from the pivot on the other side. What is the missing weight in newtons?

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