Engineering Worksheet: Part 2 Test

Engineering lesson 16: Part 2 test: forces and machines · Set 473 · 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.⚖️ Which class of lever is a fishing rod? (a) class 3 (b) class 2 (c) class 1
2. 2.True or false: a crane hook block is an inclined plane. (a) False (b) True
3. 3.True or false: a crane hook block is a wheel and axle. (a) False (b) True
4. 4.⚖️ A seesaw balances. Ravi (520 N) sits 4 m from the pivot on one side; Zoya (? N) sits 4 m from the pivot on the other side. What is the missing weight in newtons?
5. 5.⚖️ Along a straight bar, measured from the left end, the effort is at 30 cm, the fulcrum at 40 cm and the load at 0 cm. Which class of lever is it? (a) class 1 (b) class 3 (c) class 2
6. 6.🏋️ A smooth ramp is 4 m long and rises 2 m. What effort pushes a 500 N box up it, in newtons? (ideal ramp, no friction)
7. 7.🛞 More or less friction: chalk on a gym bar? (a) less friction (b) more friction
8. 8.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 1 N, a glass sheet 4 N, a carpet 5 N, sandpaper 6 N. Which surface gave the least friction? (a) sandpaper (b) a glass sheet (c) ice (d) a carpet
9. 9.⚖️ On a seesaw, a heavier child should sit … (a) farther from the pivot (b) on the pivot (c) anywhere (d) closer to the pivot
10. 10.🏋️ A 20 kg box is lifted straight up by 2 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
11. 11.💪 A box weighs 20 N. Taking 1 kg to weigh about 10 N, what is its mass in kilograms?
12. 12.⚖️ To lift a heavy rock with a crowbar more easily, push … (a) far from the fulcrum (b) on the rock (c) near the fulcrum (d) on the fulcrum
13. 13.🪝 Fixed or movable pulley: which one is on a flagpole top? (a) a fixed pulley (b) a movable pulley
14. 14.True or false: a fixed pulley halves the effort. (a) False (b) True
15. 15.💪 Which force is at work: a rolling ball slows? (a) magnetic force (b) gravity (c) friction (d) muscular force
16. 16.Which of these is an inclined plane? (a) the tip of a nail (b) a water tap handle (c) a well winch handle (d) a road up a hill
17. 17.Which of these is a screw? (a) a jar lid (b) a water tap handle (c) a round doorknob (d) a well winch handle
18. 18.⚖️ Which class of lever is a pair of pliers? (a) class 3 (b) class 1 (c) class 2
19. 19.🏋️ A machine lifts a load of 450 N when you push with 150 N. What is its mechanical advantage (MA)?
20. 20.⚖️ A seesaw balances. Arjun (160 N) sits 3 m from the pivot on one side; Zoya (? N) sits 1 m from the pivot on the other side. What is the missing weight in newtons?
21. 21.True or false: a crowbar is a class 1 lever (fulcrum in the middle). (a) False (b) True
22. 22.🏋️ A smooth ramp is 9 m long and rises 3 m. What effort pushes a 750 N box up it, in newtons? (ideal ramp, no friction)
23. 23.🪝 A well winch has a handle (wheel) of radius 30 cm turning an axle of radius 5 cm. What is its mechanical advantage (MA)?
24. 24.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 4 N, a glass sheet 8 N, a wooden plank 11 N, a carpet 15 N. Which surface gave the most friction? (a) a carpet (b) a wooden plank (c) a glass sheet (d) ice
25. 25.🏋️ A force of 320 N did 960 J of work. How many metres did the object move?
26. 26.🛞 Is friction helpful or a problem here: brakes stopping a cycle? (a) a problem (b) helpful
27. 27.True or false: a pair of pliers is a class 2 lever (load in the middle). (a) False (b) True
28. 28.🪝 More rope sections holding a load means … (a) more effort needed (b) the load floats (c) no change (d) less effort needed
29. 29.True or false: pushing a trolley is a pull. (a) False (b) True
30. 30.True or false: skating on ice gives more friction. (a) False (b) True
31. 31.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 7 N, sandpaper 9 N, ice 3 N, a wooden plank 5 N. How many newtons more were needed on sandpaper than on ice?
32. 32.⚖️ Along a straight bar, measured from the left end, the effort is at 10 cm, the fulcrum at 0 cm and the load at 50 cm. Which class of lever is it? (a) class 2 (b) class 3 (c) class 1
33. 33.🛞 More or less friction: oil on a squeaky hinge? (a) less friction (b) more friction
34. 34.🛞 Which surface gives the MOST friction to a sliding block? (a) polished marble (b) glass (c) sandpaper (d) ice
35. 35.True or false: the tip of a nail is a lever. (a) True (b) False
36. 36.💪 Which force is at work: a compass needle turns? (a) friction (b) gravity (c) magnetic force (d) muscular force
37. 37.⚖️ Along a straight bar, measured from the left end, the effort is at 30 cm, the fulcrum at 70 cm and the load at 110 cm. Which class of lever is it? (a) class 2 (b) class 1 (c) class 3
38. 38.⚖️ Going along a lever from one end to the other, the order is: effort, load, fulcrum. Which class of lever is it? (a) class 3 (b) class 1 (c) class 2
39. 39.⚖️ A lever bar balances. The load is 270 N at ? cm from the fulcrum. The effort is 180 N at 30 cm from the fulcrum on the other side. What is the missing distance in centimetres?
40. 40.🔍 Which is the odd one out? (a) oil on a squeaky hinge (b) powder on a carrom board (c) a tyre with deep treads (d) a wet tiled floor

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