Engineering Worksheet: Part 2 Test

Engineering lesson 16: Part 2 test: forces and machines · Set 616 · 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 90 N at 50 cm from the fulcrum. The effort is ? N at 30 cm from the fulcrum on the other side. What is the missing force in newtons?
2. 2.⚖️ 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 2 (b) class 3 (c) class 1
3. 3.🏋️ Mechanical advantage (MA) = … (a) load ÷ effort (b) load × effort (c) load + effort (d) effort ÷ load
4. 4.💪 In a tug of war, one team pulls left with 85 N and the other pulls right with 15 N. What is the size of the net force, in newtons?
5. 5.Which of these is a pulley? (a) a round doorknob (b) the tip of a nail (c) a crane hook block (d) a truck loading ramp
6. 6.⚖️ A seesaw balances. Zoya (480 N) sits 1 m from the pivot on one side; Arjun (? N) sits 3 m from the pivot on the other side. What is the missing weight in newtons?
7. 7.⚙️ Which simple machine is a round doorknob? (a) lever (b) wheel and axle (c) screw (d) wedge
8. 8.True or false: a smooth steel slide gives more friction. (a) False (b) True
9. 9.💪 In a tug of war, one team pulls right with 15 N and the other pulls left with 10 N. What is the size of the net force, in newtons?
10. 10.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 5 N, a carpet 6 N, sandpaper 10 N, a glass sheet 1 N. Which surface gave the least friction? (a) a carpet (b) a glass sheet (c) a wooden plank (d) sandpaper
11. 11.🏋️ A machine lifts a load of 420 N when you push with 140 N. What is its mechanical advantage (MA)?
12. 12.True or false: a wet tiled floor gives more friction. (a) False (b) True
13. 13.True or false: a truck loading ramp is a pulley. (a) True (b) False
14. 14.⚖️ Along a straight bar, measured from the left end, the effort is at 30 cm, the fulcrum at 10 cm and the load at 60 cm. Which class of lever is it? (a) class 2 (b) class 3 (c) class 1
15. 15.⚖️ In a class 1 lever, what is in the middle? (a) the effort (b) the fulcrum (c) nothing (d) the load
16. 16.💪 Which can a force NOT do? (a) change its colour (b) start it moving (c) change its shape (d) stop it moving
17. 17.True or false: a movable pulley rises with the load. (a) False (b) True
18. 18.💪 Is pushing a swing a push or a pull? (a) a pull (b) a push
19. 19.True or false: a movable pulley hangs on the rope loop. (a) False (b) True
20. 20.🪝 What does a single fixed pulley change? (a) the colour of rope (b) the size of the load (c) the direction of pull (d) gravity
21. 21.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 2 N, a carpet 4 N, sandpaper 5 N, ice 1 N. Which surface gave the least friction? (a) a glass sheet (b) sandpaper (c) ice (d) a carpet
22. 22.🛞 More or less friction: skating on ice? (a) more friction (b) less friction
23. 23.⚖️ A lever bar balances. The load is 200 N at 20 cm from the fulcrum. The effort is 100 N at ? cm from the fulcrum on the other side. What is the missing distance in centimetres?
24. 24.True or false: a fixed pulley is on a flagpole top. (a) False (b) True
25. 25.⚖️ Going along a lever from one end to the other, the order is: load, fulcrum, effort. Which class of lever is it? (a) class 2 (b) class 3 (c) class 1
26. 26.💪 Is opening a drawer a push or a pull? (a) a pull (b) a push
27. 27.True or false: a movable pulley halves the effort. (a) True (b) False
28. 28.⚙️ Most simple machines make work easier by letting us … (a) make new energy (b) use a smaller force (c) switch off gravity (d) stop all friction
29. 29.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 4 N, a glass sheet 5 N, a wooden plank 6 N, sandpaper 8 N. How many newtons more were needed on sandpaper than on ice?
30. 30.🛞 Is friction helpful or a problem here: gripping a cricket bat? (a) helpful (b) a problem
31. 31.True or false: plucking a mango is a push. (a) True (b) False
32. 32.True or false: a nutcracker is a class 2 lever (load in the middle). (a) False (b) True
33. 33.⚖️ A seesaw balances. Kabir (? N) sits 3 m from the pivot on one side; Asha (510 N) sits 2 m from the pivot on the other side. What is the missing weight in newtons?
34. 34.🪝 A pulley system has 3 rope sections holding up the load. To lift the load by 2 m, how many metres of rope must you pull?
35. 35.⚖️ Along a straight bar, measured from the left end, the effort is at 50 cm, the fulcrum at 20 cm and the load at 80 cm. Which class of lever is it? (a) class 1 (b) class 2 (c) class 3
36. 36.🏋️ Work is done when a force moves something … (a) through a distance (b) very slowly (c) only upwards (d) without moving it
37. 37.💪 A box weighs 240 N. Taking 1 kg to weigh about 10 N, what is its mass in kilograms?
38. 38.True or false: a wet tiled floor gives less friction. (a) False (b) True
39. 39.🛞 Is friction helpful or a problem here: writing with a pencil? (a) helpful (b) a problem
40. 40.⚖️ A seesaw balances. Asha (360 N) sits 4 m from the pivot on one side; Arjun (720 N) sits ? m from the pivot on the other side. What is the missing distance in metres?

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