Engineering Worksheet: Part 2 Test

Engineering lesson 16: Part 2 test: forces and machines · Set 784 · 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.⚖️ Along a straight bar, measured from the left end, the effort is at 60 cm, the fulcrum at 20 cm and the load at 10 cm. Which class of lever is it? (a) class 2 (b) class 3 (c) class 1
2. 2.🪝 What does a single fixed pulley change? (a) gravity (b) the size of the load (c) the colour of rope (d) the direction of pull
3. 3.⚖️ In a class 1 lever, what is in the middle? (a) the load (b) the effort (c) nothing (d) the fulcrum
4. 4.🪝 A well winch has a handle (wheel) of radius 40 cm turning an axle of radius 5 cm. What is its mechanical advantage (MA)?
5. 5.True or false: a pair of scissors is a class 1 lever (fulcrum in the middle). (a) False (b) True
6. 6.Which of these is caused by muscular force? (a) rubbing hands warms them (b) an apple falls down (c) rain falls to the ground (d) squeezing a lemon
7. 7.True or false: a flagpole rope wheel is a wedge. (a) True (b) False
8. 8.⚙️ Which simple machine is a window blind cord? (a) pulley (b) wheel and axle (c) lever (d) inclined plane
9. 9.🏋️ A machine lifts a load of 80 N when you push with 20 N. What is its mechanical advantage (MA)?
10. 10.True or false: a smooth steel slide gives less friction. (a) True (b) False
11. 11.⚖️ On a seesaw, a heavier child should sit … (a) on the pivot (b) farther from the pivot (c) anywhere (d) closer to the pivot
12. 12.⚖️ A lever bar balances. The load is 360 N at 10 cm from the fulcrum. The effort is ? N at 40 cm from the fulcrum on the other side. What is the missing force in newtons?
13. 13.🔍 Which is the odd one out? (a) a rough doormat (b) a box pushed on carpet (c) skating on ice (d) a tyre with deep treads
14. 14.True or false: a fixed pulley makes you pull 2× rope. (a) False (b) True
15. 15.🏋️ A force of 470 N did 3760 J of work. How many metres did the object move?
16. 16.💪 Two children push a box to the right, one with 95 N and the other with 35 N. What is the net (total) force on the box, in newtons?
17. 17.⚖️ Which class of lever is a pair of pliers? (a) class 2 (b) class 1 (c) class 3
18. 18.🏋️ A machine lifts a load of 80 N when you push with 40 N. What is its mechanical advantage (MA)?
19. 19.🪝 A wheel and axle is a big wheel fixed to … (a) a sharp wedge (b) a loose rope (c) a smaller rod (axle) (d) a flat ramp
20. 20.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 9 N, a glass sheet 1 N, a wooden plank 4 N, a carpet 8 N. Which surface gave the least friction? (a) a wooden plank (b) a carpet (c) sandpaper (d) a glass sheet
21. 21.💪 In which unit do we measure force? (a) metre (m) (b) second (s) (c) newton (N) (d) litre (L)
22. 22.⚖️ A seesaw balances. Asha (? N) sits 1 m from the pivot on one side; Zoya (200 N) sits 2 m from the pivot on the other side. What is the missing weight in newtons?
23. 23.True or false: a knife edge is a lever. (a) False (b) True
24. 24.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 1 N, a glass sheet 5 N, a wooden plank 6 N, a carpet 9 N. How many newtons more were needed on a carpet than on ice?
25. 25.True or false: a fixed pulley rises with the load. (a) False (b) True
26. 26.🛞 More or less friction: chalk on a gym bar? (a) more friction (b) less friction
27. 27.🏋️ A force of 470 N did 1880 J of work. How many metres did the object move?
28. 28.🏋️ A smooth ramp is 8 m long and rises 2 m. What effort pushes a 1400 N box up it, in newtons? (ideal ramp, no friction)
29. 29.💪 A bag has a mass of 49 kg. Taking 1 kg to weigh about 10 N, what is its weight in newtons?
30. 30.True or false: a wet tiled floor gives more friction. (a) False (b) True
31. 31.Which of these is a wedge? (a) a window blind cord (b) a water tap handle (c) a chisel (d) a claw hammer on a nail
32. 32.⚖️ Which class of lever is a crowbar? (a) class 3 (b) class 2 (c) class 1
33. 33.💪 A box weighs 300 N. Taking 1 kg to weigh about 10 N, what is its mass in kilograms?
34. 34.🪝 A well winch has a handle (wheel) of radius 3 cm turning an axle of radius 1 cm. What is its mechanical advantage (MA)?
35. 35.True or false: plucking a mango is a pull. (a) False (b) True
36. 36.True or false: a pair of pliers is a class 2 lever (load in the middle). (a) False (b) True
37. 37.True or false: a seesaw is a class 3 lever (effort in the middle). (a) False (b) True
38. 38.True or false: kicking a football is a pull. (a) False (b) True
39. 39.🪝 A bucket weighing 420 N is lifted with a single fixed pulley at the top of a well. What effort is needed, in newtons? (ideal pulley, no friction)
40. 40.⚖️ A seesaw balances. Meena (190 N) sits 2 m from the pivot on one side; Arjun (? N) sits 1 m from the pivot on the other side. What is the missing weight in newtons?

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