Engineering Worksheet: Part 2 Test

Engineering lesson 16: Part 2 test: forces and machines · Set 469 · 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 broom when sweeping? (a) class 2 (b) class 1 (c) class 3
2. 2.⚖️ Which class of lever is a fishing rod? (a) class 1 (b) class 3 (c) class 2
3. 3.🏋️ A force of 490 N did 4410 J of work. How many metres did the object move?
4. 4.⚖️ Along a straight bar, measured from the left end, the effort is at 50 cm, the fulcrum at 10 cm and the load at 90 cm. Which class of lever is it? (a) class 1 (b) class 2 (c) class 3
5. 5.⚙️ Which simple machine is a crowbar? (a) wheel and axle (b) inclined plane (c) wedge (d) lever
6. 6.⚖️ A seesaw balances. Meena (? N) sits 4 m from the pivot on one side; Kabir (800 N) sits 1 m from the pivot on the other side. What is the missing weight in newtons?
7. 7.💪 Is opening a drawer a push or a pull? (a) a pull (b) a push
8. 8.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 3 N, a glass sheet 7 N, a carpet 9 N, sandpaper 12 N. How many newtons more were needed on sandpaper than on ice?
9. 9.True or false: a grippy rubber sole gives less friction. (a) True (b) False
10. 10.⚖️ A seesaw balances. Asha (? N) sits 1 m from the pivot on one side; Ravi (170 N) sits 2 m from the pivot on the other side. What is the missing weight in newtons?
11. 11.⚙️ How many simple machines are there in the usual list? (a) 6 (b) 12 (c) 10 (d) 3
12. 12.🪝 A pulley system lifts a 120 N load with an effort of 60 N. What is its mechanical advantage (MA)?
13. 13.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 7 N, sandpaper 9 N, a glass sheet 1 N, a wooden plank 3 N. Which surface gave the most friction? (a) a carpet (b) sandpaper (c) a glass sheet (d) a wooden plank
14. 14.💪 Two children push a box to the right, one with 95 N and the other with 30 N. What is the net (total) force on the box, in newtons?
15. 15.🛞 More or less friction: a grippy rubber sole? (a) more friction (b) less friction
16. 16.⚖️ Going along a lever from one end to the other, the order is: effort, load, fulcrum. Which class of lever is it? (a) class 1 (b) class 2 (c) class 3
17. 17.⚖️ In a class 2 lever, what is in the middle? (a) the fulcrum (b) the load (c) the axle (d) the effort
18. 18.⚙️ Which simple machine is a wood screw? (a) inclined plane (b) pulley (c) wheel and axle (d) screw
19. 19.💪 Which force pulls everything towards the Earth? (a) gravity (b) magnetism (c) wind (d) friction
20. 20.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 8 N, a carpet 12 N, sandpaper 16 N, a glass sheet 4 N. Which surface gave the least friction? (a) a carpet (b) a glass sheet (c) a wooden plank (d) sandpaper
21. 21.🛞 Is friction helpful or a problem here: brakes stopping a cycle? (a) helpful (b) a problem
22. 22.💪 Which can a force NOT do? (a) stop it moving (b) change its shape (c) start it moving (d) change its colour
23. 23.⚖️ Turning effect = force × … (a) colour of bar (b) distance from fulcrum (c) mass of fulcrum (d) time taken
24. 24.⚖️ Going along a lever from one end to the other, the order is: fulcrum, effort, load. Which class of lever is it? (a) class 1 (b) class 2 (c) class 3
25. 25.🪝 A wheel and axle is a big wheel fixed to … (a) a loose rope (b) a smaller rod (axle) (c) a sharp wedge (d) a flat ramp
26. 26.⚙️ Most simple machines make work easier by letting us … (a) use a smaller force (b) make new energy (c) stop all friction (d) switch off gravity
27. 27.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 4 N, a wooden plank 6 N, a carpet 10 N, sandpaper 12 N. Which surface gave the least friction? (a) a glass sheet (b) sandpaper (c) a carpet (d) a wooden plank
28. 28.🏋️ A 2 kg box is lifted straight up by 2 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
29. 29.🏋️ Can a simple machine reduce the work done? (a) yes, by half (b) no, work stays the same (c) yes, always (d) only on Mondays
30. 30.⚖️ Which class of lever is a pair of pliers? (a) class 3 (b) class 1 (c) class 2
31. 31.🪝 A load of 380 N hangs from a pulley system in which 2 rope sections hold up the load. What effort is needed, in newtons? (ideal pulleys)
32. 32.🏋️ A smooth ramp is 4 m long and rises 2 m. What effort pushes a 600 N box up it, in newtons? (ideal ramp, no friction)
33. 33.True or false: a movable pulley stays in one place. (a) True (b) False
34. 34.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 6 N, a carpet 7 N, sandpaper 8 N, ice 3 N. Which surface gave the least friction? (a) a wooden plank (b) sandpaper (c) a carpet (d) ice
35. 35.⚖️ A seesaw balances. Asha (120 N) sits ? m from the pivot on one side; Zoya (240 N) sits 1 m from the pivot on the other side. What is the missing distance in metres?
36. 36.🛞 More or less friction: a wheel on ball bearings? (a) more friction (b) less friction
37. 37.True or false: a fixed pulley hangs on the rope loop. (a) True (b) False
38. 38.⚖️ On a seesaw, a heavier child should sit … (a) on the pivot (b) closer to the pivot (c) farther from the pivot (d) anywhere
39. 39.🏋️ Pushing a crate 7 m took 770 J of work. What force was used, in newtons?
40. 40.🏋️ A 6 kg box is lifted straight up by 2 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?

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