Engineering Worksheet: Part 2 Test

Engineering lesson 16: Part 2 test: forces and machines · Set 685 · 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 force pulls everything towards the Earth? (a) wind (b) friction (c) magnetism (d) gravity
2. 2.⚖️ Along a straight bar, measured from the left end, the effort is at 30 cm, the fulcrum at 50 cm and the load at 40 cm. Which class of lever is it? (a) class 1 (b) class 3 (c) class 2
3. 3.True or false: a fixed pulley halves the effort. (a) False (b) True
4. 4.💪 Two equal forces push on a box from opposite sides. They are … (a) balanced (b) unbalanced (c) gravity (d) doubled
5. 5.⚖️ In a class 1 lever, what is in the middle? (a) the fulcrum (b) nothing (c) the effort (d) the load
6. 6.🏋️ A 13 kg box is lifted straight up by 2 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
7. 7.True or false: a grippy rubber sole gives less friction. (a) True (b) False
8. 8.🛞 Rubbing your hands fast makes them … (a) wet (b) cold (c) warm (d) magnetic
9. 9.🔍 Which is the odd one out? (a) a well-bucket rope wheel (b) a wood screw (c) a window blind cord (d) a crane hook block
10. 10.🏋️ A 10 kg box is lifted straight up by 1 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
11. 11.True or false: a round doorknob is an inclined plane. (a) True (b) False
12. 12.🛞 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 9 N, ice 4 N. Which surface gave the least friction? (a) ice (b) sandpaper (c) a wooden plank (d) a carpet
13. 13.🔍 Which is the odd one out? (a) a claw hammer on a nail (b) a seesaw (c) a bottle opener (d) a bottle cap
14. 14.🪝 A bucket weighing 290 N is lifted with a single fixed pulley at the top of a well. What effort is needed, in newtons? (ideal pulley, no friction)
15. 15.⚖️ A lever bar balances. The load is 450 N at ? cm from the fulcrum. The effort is 270 N at 50 cm from the fulcrum on the other side. What is the missing distance in centimetres?
16. 16.🪝 Fixed or movable pulley: which one needs effort = load? (a) a fixed pulley (b) a movable pulley
17. 17.🪝 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)
18. 18.⚖️ Along a straight bar, measured from the left end, the effort is at 40 cm, the fulcrum at 80 cm and the load at 10 cm. Which class of lever is it? (a) class 1 (b) class 3 (c) class 2
19. 19.⚖️ A lever bar balances. The load is 270 N at 50 cm from the fulcrum. The effort is 150 N at ? cm from the fulcrum on the other side. What is the missing distance in centimetres?
20. 20.⚖️ Which class of lever is a lemon squeezer? (a) class 3 (b) class 2 (c) class 1
21. 21.💪 Is a tug of war a push or a pull? (a) a pull (b) a push
22. 22.True or false: a fixed pulley rises with the load. (a) False (b) True
23. 23.🪝 A bucket weighing 260 N is lifted with a single fixed pulley at the top of a well. What effort is needed, in newtons? (ideal pulley, no friction)
24. 24.🔍 Which is the odd one out? (a) a screw jack (b) a wood screw (c) a well-bucket rope wheel (d) a bottle cap
25. 25.⚖️ Going along a lever from one end to the other, the order is: fulcrum, effort, load. Which class of lever is it? (a) class 3 (b) class 2 (c) class 1
26. 26.⚖️ A lever bar balances. The load is 20 N at ? cm from the fulcrum. The effort is 30 N at 20 cm from the fulcrum on the other side. What is the missing distance in centimetres?
27. 27.True or false: a knife edge is an inclined plane. (a) True (b) False
28. 28.🏋️ A smooth ramp is 6 m long and rises 3 m. What effort pushes an 800 N box up it, in newtons? (ideal ramp, no friction)
29. 29.🛞 How can we reduce friction in a machine? (a) press parts harder (b) oil the moving parts (c) make parts rough (d) add sand
30. 30.⚖️ A seesaw balances. Asha (190 N) sits 3 m from the pivot on one side; Arjun (570 N) sits ? m from the pivot on the other side. What is the missing distance in metres?
31. 31.🏋️ A force of 10 N pushes a cart 3 m along the floor. How much work is done, in joules?
32. 32.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 1 N, a glass sheet 3 N, a wooden plank 7 N, sandpaper 10 N. How many newtons more were needed on sandpaper than on ice?
33. 33.⚖️ Turning effect = force × … (a) distance from fulcrum (b) colour of bar (c) mass of fulcrum (d) time taken
34. 34.🛞 Is friction helpful or a problem here: striking a matchstick? (a) a problem (b) helpful
35. 35.🏋️ Pushing a crate 5 m took 450 J of work. What force was used, in newtons?
36. 36.🏋️ A 3 kg box is lifted straight up by 2 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
37. 37.True or false: a fixed pulley stays in one place. (a) True (b) False
38. 38.💪 Which force is at work: brakes stop a bicycle? (a) muscular force (b) gravity (c) magnetic force (d) friction
39. 39.🛞 Friction acts … (a) only on ice (b) against the motion (c) with the motion (d) only upwards
40. 40.True or false: plucking a mango is a push. (a) True (b) False

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