Engineering Worksheet: Part 2 Test

Engineering lesson 16: Part 2 test: forces and machines · Set 863 · 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 pulley system lifts a 100 N load with an effort of 50 N. What is its mechanical advantage (MA)?
2. 2.💪 Is pushing a trolley a push or a pull? (a) a push (b) a pull
3. 3.True or false: pulling a cart is a push. (a) False (b) True
4. 4.⚖️ Along a straight bar, measured from the left end, the effort is at 20 cm, the fulcrum at 30 cm and the load at 60 cm. Which class of lever is it? (a) class 1 (b) class 3 (c) class 2
5. 5.⚖️ A lever bar balances. The load is 240 N at 40 cm from the fulcrum. The effort is ? N at 60 cm from the fulcrum on the other side. What is the missing force in newtons?
6. 6.💪 Which force is at work: brakes stop a bicycle? (a) gravity (b) magnetic force (c) muscular force (d) friction
7. 7.🪝 A pulley system lifts a 760 N load with an effort of 190 N. What is its mechanical advantage (MA)?
8. 8.💪 In a tug of war, one team pulls left with 25 N and the other pulls right with 5 N. What is the size of the net force, in newtons?
9. 9.⚙️ Which simple machine is the tip of a nail? (a) pulley (b) wheel and axle (c) wedge (d) lever
10. 10.💪 Is closing a drawer a push or a pull? (a) a push (b) a pull
11. 11.⚖️ Which class of lever is a beam balance? (a) class 1 (b) class 3 (c) class 2
12. 12.True or false: a pair of scissors is a class 1 lever (fulcrum in the middle). (a) True (b) False
13. 13.⚖️ Turning effect = force × … (a) time taken (b) mass of fulcrum (c) colour of bar (d) distance from fulcrum
14. 14.⚖️ Along a straight bar, measured from the left end, the effort is at 70 cm, the fulcrum at 20 cm and the load at 40 cm. Which class of lever is it? (a) class 3 (b) class 2 (c) class 1
15. 15.🛞 More or less friction: a tyre with deep treads? (a) more friction (b) less friction
16. 16.⚖️ A lever balances when … (a) the bar is short (b) turning effects match (c) the fulcrum moves (d) both weights are equal
17. 17.🪝 A load of 180 N hangs from a pulley system in which 2 rope sections hold up the load. What effort is needed, in newtons? (ideal pulleys)
18. 18.True or false: a seesaw is a class 3 lever (effort in the middle). (a) False (b) True
19. 19.🔍 Which is the odd one out? (a) a box pushed on carpet (b) a rough doormat (c) a smooth steel slide (d) a tyre with deep treads
20. 20.⚖️ A seesaw balances. Asha (? N) sits 4 m from the pivot on one side; Ravi (520 N) sits 1 m from the pivot on the other side. What is the missing weight in newtons?
21. 21.⚙️ A screw is really … (a) a kind of wheel (b) a bent lever (c) a tiny pulley (d) a ramp wrapped round
22. 22.True or false: a pair of scissors is a class 3 lever (effort in the middle). (a) False (b) True
23. 23.True or false: pulling up your socks is a pull. (a) False (b) True
24. 24.🏋️ A machine lifts a load of 380 N when you push with 190 N. What is its mechanical advantage (MA)?
25. 25.⚖️ A seesaw balances. Zoya (600 N) sits 1 m from the pivot on one side; Arjun (150 N) sits ? m from the pivot on the other side. What is the missing distance in metres?
26. 26.True or false: a smooth steel slide gives more friction. (a) False (b) True
27. 27.🏋️ Can a simple machine reduce the work done? (a) yes, by half (b) yes, always (c) only on Mondays (d) no, work stays the same
28. 28.💪 A box weighs 60 N. Taking 1 kg to weigh about 10 N, what is its mass in kilograms?
29. 29.🪝 A bucket weighing 370 N is lifted with a single fixed pulley at the top of a well. What effort is needed, in newtons? (ideal pulley, no friction)
30. 30.🪝 A winch has a wheel of radius 6 cm and an axle of radius 3 cm. What effort on the wheel lifts a 380 N bucket on the axle, in newtons? (ideal)
31. 31.⚙️ Which simple machine is a screw jack? (a) screw (b) lever (c) inclined plane (d) pulley
32. 32.⚖️ In a class 3 lever, what is in the middle? (a) the pulley (b) the load (c) the fulcrum (d) the effort
33. 33.True or false: a well winch handle is a lever. (a) True (b) False
34. 34.💪 A box weighs 500 N. Taking 1 kg to weigh about 10 N, what is its mass in kilograms?
35. 35.🪝 A wheel and axle is a big wheel fixed to … (a) a sharp wedge (b) a loose rope (c) a flat ramp (d) a smaller rod (axle)
36. 36.⚖️ Along a straight bar, measured from the left end, the effort is at 40 cm, the fulcrum at 0 cm and the load at 20 cm. Which class of lever is it? (a) class 1 (b) class 3 (c) class 2
37. 37.True or false: a nutcracker is a class 2 lever (load in the middle). (a) True (b) False
38. 38.⚖️ A seesaw balances. Asha (100 N) sits 2 m from the pivot on one side; Zoya (200 N) sits ? m from the pivot on the other side. What is the missing distance in metres?
39. 39.⚖️ A lever bar balances. The load is 720 N at 30 cm from the fulcrum. The effort is ? N at 80 cm from the fulcrum on the other side. What is the missing force in newtons?
40. 40.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 6 N, a wooden plank 7 N, a carpet 11 N, ice 2 N. Which surface gave the most friction? (a) a glass sheet (b) a carpet (c) ice (d) a wooden plank

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