Engineering Worksheet: Part 2 Test

Engineering lesson 16: Part 2 test: forces and machines · Set 818 · 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 200 N at 90 cm from the fulcrum on the other side. What is the missing force in newtons?
2. 2.💪 In a tug of war, one team pulls right with 90 N and the other pulls left with 40 N. What is the size of the net force, in newtons?
3. 3.🛞 Is friction helpful or a problem here: striking a matchstick? (a) helpful (b) a problem
4. 4.⚖️ A lever bar balances. The load is 100 N at 30 cm from the fulcrum. The effort is 150 N at ? cm from the fulcrum on the other side. What is the missing distance in centimetres?
5. 5.💪 Is pressing a doorbell a push or a pull? (a) a pull (b) a push
6. 6.🏋️ A smooth ramp is 4 m long and rises 2 m. What effort pushes a 1300 N box up it, in newtons? (ideal ramp, no friction)
7. 7.💪 A bag has a mass of 14 kg. Taking 1 kg to weigh about 10 N, what is its weight in newtons?
8. 8.💪 Which force is at work: a compass needle turns? (a) friction (b) gravity (c) magnetic force (d) muscular force
9. 9.🛞 More or less friction: a box pushed on carpet? (a) less friction (b) more friction
10. 10.True or false: a movable pulley hangs on the rope loop. (a) False (b) True
11. 11.⚖️ Which class of lever is a nutcracker? (a) class 3 (b) class 2 (c) class 1
12. 12.⚙️ A wedge is … (a) a wheel on a rod (b) a bar on a pivot (c) two ramps back to back (d) a rope on a wheel
13. 13.True or false: a fixed pulley only changes direction. (a) True (b) False
14. 14.⚖️ Along a straight bar, measured from the left end, the effort is at 20 cm, the fulcrum at 60 cm and the load at 100 cm. Which class of lever is it? (a) class 3 (b) class 2 (c) class 1
15. 15.True or false: sand on a slippery path gives less friction. (a) True (b) False
16. 16.🪝 A well winch has a handle (wheel) of radius 25 cm turning an axle of radius 5 cm. What is its mechanical advantage (MA)?
17. 17.💪 Which force is at work: squeezing a lemon? (a) friction (b) magnetic force (c) muscular force (d) gravity
18. 18.🏋️ In which unit is work measured? (a) newton (N) (b) watt hour (c) metre (m) (d) joule (J)
19. 19.🏋️ A force of 240 N pushes a cart 8 m along the floor. How much work is done, in joules?
20. 20.🏋️ A force of 160 N did 1600 J of work. How many metres did the object move?
21. 21.🏋️ A longer ramp to the same height needs … (a) more effort (b) the same effort (c) less effort (d) no effort
22. 22.⚖️ Along a straight bar, measured from the left end, the effort is at 10 cm, the fulcrum at 50 cm and the load at 0 cm. Which class of lever is it? (a) class 1 (b) class 2 (c) class 3
23. 23.🏋️ A force of 460 N pushes a cart 4 m along the floor. How much work is done, in joules?
24. 24.⚖️ A lever bar balances. The load is 900 N at 10 cm from the fulcrum. The effort is ? N at 90 cm from the fulcrum on the other side. What is the missing force in newtons?
25. 25.⚖️ Turning effect = force × … (a) time taken (b) mass of fulcrum (c) distance from fulcrum (d) colour of bar
26. 26.⚖️ Along a straight bar, measured from the left end, the effort is at 0 cm, the fulcrum at 40 cm and the load at 10 cm. Which class of lever is it? (a) class 3 (b) class 1 (c) class 2
27. 27.True or false: a fixed pulley makes you pull 2× rope. (a) True (b) False
28. 28.⚖️ A seesaw balances. Zoya (280 N) sits 1 m from the pivot on one side; Arjun (140 N) sits ? m from the pivot on the other side. What is the missing distance in metres?
29. 29.⚖️ In a class 3 lever, what is in the middle? (a) the load (b) the effort (c) the fulcrum (d) the pulley
30. 30.⚖️ Along a straight bar, measured from the left end, the effort is at 20 cm, the fulcrum at 0 cm and the load at 60 cm. Which class of lever is it? (a) class 1 (b) class 3 (c) class 2
31. 31.🛞 Friction acts … (a) against the motion (b) only on ice (c) with the motion (d) only upwards
32. 32.🏋️ Pushing a crate 3 m took 480 J of work. What force was used, in newtons?
33. 33.⚖️ A lever bar balances. The load is 90 N at 20 cm from the fulcrum. The effort is ? N at 90 cm from the fulcrum on the other side. What is the missing force in newtons?
34. 34.⚖️ Along a straight bar, measured from the left end, the effort is at 0 cm, the fulcrum at 50 cm and the load at 40 cm. Which class of lever is it? (a) class 1 (b) class 3 (c) class 2
35. 35.🪝 A load of 340 N hangs from a pulley system in which 2 rope sections hold up the load. What effort is needed, in newtons? (ideal pulleys)
36. 36.⚖️ A lever bar balances. The load is 480 N at 30 cm from the fulcrum. The effort is 180 N at ? cm from the fulcrum on the other side. What is the missing distance in centimetres?
37. 37.⚖️ A lever bar balances. The load is 280 N at ? cm from the fulcrum. The effort is 210 N at 40 cm from the fulcrum on the other side. What is the missing distance in centimetres?
38. 38.🔍 Which is the odd one out? (a) a crowbar (b) a bottle opener (c) a truck loading ramp (d) a claw hammer on a nail
39. 39.⚖️ In a class 1 lever, what is in the middle? (a) the load (b) nothing (c) the effort (d) the fulcrum
40. 40.⚖️ On a seesaw, a heavier child should sit … (a) anywhere (b) on the pivot (c) farther from the pivot (d) closer to the pivot

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