Engineering Worksheet: Part 2 Test

Engineering lesson 16: Part 2 test: forces and machines · Set 595 · 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 seesaw balances. Arjun (? N) sits 3 m from the pivot on one side; Ravi (300 N) sits 1 m from the pivot on the other side. What is the missing weight in newtons?
2. 2.💪 Which force is at work: brakes stop a bicycle? (a) friction (b) muscular force (c) gravity (d) magnetic force
3. 3.⚖️ Along a straight bar, measured from the left end, the effort is at 10 cm, the fulcrum at 90 cm and the load at 50 cm. Which class of lever is it? (a) class 3 (b) class 1 (c) class 2
4. 4.🪝 A pulley system lifts an 80 N load with an effort of 20 N. What is its mechanical advantage (MA)?
5. 5.🏋️ A force of 280 N did 2240 J of work. How many metres did the object move?
6. 6.🪝 A winch has a wheel of radius 10 cm and an axle of radius 2 cm. What effort on the wheel lifts a 400 N bucket on the axle, in newtons? (ideal)
7. 7.🏋️ In which unit is work measured? (a) watt hour (b) metre (m) (c) newton (N) (d) joule (J)
8. 8.⚖️ Which class of lever is a pair of scissors? (a) class 2 (b) class 3 (c) class 1
9. 9.🏋️ Work is done when a force moves something … (a) only upwards (b) through a distance (c) very slowly (d) without moving it
10. 10.Which of these is caused by gravity? (a) a compass needle turns (b) a thrown ball comes down (c) a fridge magnet sticks (d) squeezing a lemon
11. 11.🏋️ Pushing a crate 5 m took 2200 J of work. What force was used, in newtons?
12. 12.🏋️ A smooth ramp is 6 m long and rises 3 m. What effort pushes a 1300 N box up it, in newtons? (ideal ramp, no friction)
13. 13.True or false: pressing a doorbell is a pull. (a) False (b) True
14. 14.💪 Two children push a box to the right, one with 25 N and the other with 60 N. What is the net (total) force on the box, in newtons?
15. 15.💪 In which unit do we measure force? (a) litre (L) (b) metre (m) (c) second (s) (d) newton (N)
16. 16.⚙️ How many simple machines are there in the usual list? (a) 6 (b) 10 (c) 3 (d) 12
17. 17.🏋️ A force of 390 N pushes a cart 3 m along the floor. How much work is done, in joules?
18. 18.🪝 A pulley system has 3 rope sections holding up the load. To lift the load by 1 m, how many metres of rope must you pull?
19. 19.True or false: pushing a trolley is a push. (a) False (b) True
20. 20.⚖️ In a class 1 lever, what is in the middle? (a) the effort (b) the load (c) nothing (d) the fulcrum
21. 21.💪 Two equal forces push on a box from opposite sides. They are … (a) unbalanced (b) doubled (c) gravity (d) balanced
22. 22.💪 Is kicking a football a push or a pull? (a) a push (b) a pull
23. 23.⚖️ Which class of lever is a wheelbarrow? (a) class 3 (b) class 1 (c) class 2
24. 24.True or false: a pair of pliers is a class 1 lever (fulcrum in the middle). (a) False (b) True
25. 25.🏋️ A machine lifts a load of 540 N when you push with 180 N. What is its mechanical advantage (MA)?
26. 26.🪝 A pulley system lifts an 880 N load with an effort of 220 N. What is its mechanical advantage (MA)?
27. 27.True or false: drawing up a well bucket is a push. (a) False (b) True
28. 28.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 9 N, sandpaper 12 N, ice 3 N, a glass sheet 6 N. How many newtons more were needed on sandpaper than on ice?
29. 29.True or false: a crane hook block is a pulley. (a) False (b) True
30. 30.⚖️ A lever bar balances. The load is ? N at 30 cm from the fulcrum. The effort is 270 N at 60 cm from the fulcrum on the other side. What is the missing force in newtons?
31. 31.🪝 A winch has a wheel of radius 16 cm and an axle of radius 4 cm. What effort on the wheel lifts a 760 N bucket on the axle, in newtons? (ideal)
32. 32.True or false: a tyre with deep treads gives more friction. (a) True (b) False
33. 33.⚖️ A seesaw balances. Kabir (120 N) sits 3 m from the pivot on one side; Ravi (? N) sits 1 m from the pivot on the other side. What is the missing weight in newtons?
34. 34.🏋️ Pushing a crate 8 m took 3840 J of work. What force was used, in newtons?
35. 35.True or false: opening a drawer is a push. (a) False (b) True
36. 36.🛞 More or less friction: a smooth steel slide? (a) less friction (b) more friction
37. 37.🏋️ A machine lifts a load of 90 N when you push with 30 N. What is its mechanical advantage (MA)?
38. 38.💪 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?
39. 39.🛞 More or less friction: a wet tiled floor? (a) more friction (b) less friction
40. 40.🪝 A well winch has a handle (wheel) of radius 8 cm turning an axle of radius 2 cm. What is its mechanical advantage (MA)?

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