Engineering Worksheet: Part 2 Test

Engineering lesson 16: Part 2 test: forces and machines · Set 462 · 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 900 N at 40 cm from the fulcrum. The effort is ? N at 100 cm from the fulcrum on the other side. What is the missing force in newtons?
2. 2.True or false: hitting a cricket ball is a pull. (a) True (b) False
3. 3.True or false: a nutcracker is a screw. (a) True (b) False
4. 4.🏋️ A force of 260 N did 1040 J of work. How many metres did the object move?
5. 5.⚖️ A seesaw balances. Arjun (? N) sits 4 m from the pivot on one side; Asha (680 N) sits 3 m from the pivot on the other side. What is the missing weight in newtons?
6. 6.⚖️ A lever bar balances. The load is 90 N at ? cm from the fulcrum. The effort is 60 N at 30 cm from the fulcrum on the other side. What is the missing distance in centimetres?
7. 7.True or false: a seesaw is a class 1 lever (fulcrum in the middle). (a) True (b) False
8. 8.💪 Which force is at work: pedalling a cycle? (a) magnetic force (b) muscular force (c) friction (d) gravity
9. 9.🏋️ Mechanical advantage (MA) = … (a) effort ÷ load (b) load ÷ effort (c) load + effort (d) load × effort
10. 10.🪝 A well winch has a handle (wheel) of radius 15 cm turning an axle of radius 5 cm. What is its mechanical advantage (MA)?
11. 11.🪝 Fixed or movable pulley: which one halves the effort? (a) a movable pulley (b) a fixed pulley
12. 12.⚖️ A seesaw balances. Ravi (? N) sits 2 m from the pivot on one side; Arjun (240 N) sits 1 m from the pivot on the other side. What is the missing weight in newtons?
13. 13.🛞 How can we reduce friction in a machine? (a) press parts harder (b) make parts rough (c) oil the moving parts (d) add sand
14. 14.🪝 Fixed or movable pulley: which one needs effort = load? (a) a fixed pulley (b) a movable pulley
15. 15.⚖️ A lever bar balances. The load is ? N at 10 cm from the fulcrum. The effort is 30 N at 20 cm from the fulcrum on the other side. What is the missing force in newtons?
16. 16.⚖️ A lever bar balances. The load is 180 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?
17. 17.🛞 More or less friction: a rough doormat? (a) less friction (b) more friction
18. 18.True or false: a wheel on ball bearings gives more friction. (a) False (b) True
19. 19.⚖️ On a seesaw, a heavier child should sit … (a) farther from the pivot (b) anywhere (c) closer to the pivot (d) on the pivot
20. 20.True or false: a tyre with deep treads gives less friction. (a) True (b) False
21. 21.🪝 A pulley system has 2 rope sections holding up the load. To lift the load by 9 m, how many metres of rope must you pull?
22. 22.🔍 Which is the odd one out? (a) skating on ice (b) a smooth steel slide (c) a grippy rubber sole (d) a wet tiled floor
23. 23.⚙️ Which simple machine is a well winch handle? (a) wheel and axle (b) lever (c) pulley (d) screw
24. 24.🏋️ A 1 kg box is lifted straight up by 1 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
25. 25.⚖️ Along a straight bar, measured from the left end, the effort is at 40 cm, the fulcrum at 20 cm and the load at 80 cm. Which class of lever is it? (a) class 3 (b) class 1 (c) class 2
26. 26.🪝 A wheel and axle is a big wheel fixed to … (a) a smaller rod (axle) (b) a flat ramp (c) a sharp wedge (d) a loose rope
27. 27.⚖️ Along a straight bar, measured from the left end, the effort is at 40 cm, the fulcrum at 0 cm and the load at 30 cm. Which class of lever is it? (a) class 1 (b) class 3 (c) class 2
28. 28.🏋️ A longer ramp to the same height needs … (a) no effort (b) the same effort (c) more effort (d) less effort
29. 29.🏋️ A 14 kg box is lifted straight up by 1 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
30. 30.Which of these is caused by muscular force? (a) a fridge magnet sticks (b) a thrown ball comes down (c) a rolling ball slows (d) pedalling a cycle
31. 31.🔍 Which is the odd one out? (a) a bottle opener (b) a well winch handle (c) a round doorknob (d) a water tap handle
32. 32.True or false: a pair of kitchen tongs is a class 3 lever (effort in the middle). (a) True (b) False
33. 33.🏋️ A smooth ramp is 6 m long and rises 1 m. What effort pushes a 3000 N box up it, in newtons? (ideal ramp, no friction)
34. 34.🪝 A well winch has a handle (wheel) of radius 28 cm turning an axle of radius 4 cm. What is its mechanical advantage (MA)?
35. 35.True or false: a tug of war is a pull. (a) False (b) True
36. 36.⚖️ A seesaw balances. Asha (? N) sits 1 m from the pivot on one side; Zoya (160 N) sits 2 m from the pivot on the other side. What is the missing weight in newtons?
37. 37.⚖️ A seesaw balances. Arjun (400 N) sits ? m from the pivot on one side; Meena (400 N) sits 2 m from the pivot on the other side. What is the missing distance in metres?
38. 38.True or false: a chisel is a wedge. (a) True (b) False
39. 39.⚖️ A lever bar balances. The load is 80 N at 50 cm from the fulcrum. The effort is 50 N at ? cm from the fulcrum on the other side. What is the missing distance in centimetres?
40. 40.True or false: a crowbar is a class 1 lever (fulcrum in the middle). (a) True (b) False

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