Engineering Worksheet: Part 2 Test

Engineering lesson 16: Part 2 test: forces and machines · Set 458 · 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 ? N at 30 cm from the fulcrum. The effort is 180 N at 100 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 40 cm, the fulcrum at 0 cm and the load at 50 cm. Which class of lever is it? (a) class 1 (b) class 3 (c) class 2
3. 3.💪 Two equal forces push on a box from opposite sides. They are … (a) unbalanced (b) gravity (c) balanced (d) doubled
4. 4.⚖️ In a class 3 lever, what is in the middle? (a) the fulcrum (b) the effort (c) the load (d) the pulley
5. 5.🏋️ A force of 500 N pushes a cart 8 m along the floor. How much work is done, in joules?
6. 6.🪝 A load of 840 N hangs from a pulley system in which 4 rope sections hold up the load. What effort is needed, in newtons? (ideal pulleys)
7. 7.🛞 Is friction helpful or a problem here: writing with a pencil? (a) a problem (b) helpful
8. 8.🔍 Which is the odd one out? (a) a tyre with deep treads (b) sand on a slippery path (c) a box pushed on carpet (d) a wheel on ball bearings
9. 9.💪 Which force is at work: a compass needle turns? (a) muscular force (b) gravity (c) magnetic force (d) friction
10. 10.⚖️ 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 1 (c) class 3
11. 11.🏋️ Pushing a crate 8 m took 1040 J of work. What force was used, in newtons?
12. 12.🛞 Rubbing your hands fast makes them … (a) cold (b) warm (c) magnetic (d) wet
13. 13.⚙️ Which simple machine is a seesaw? (a) wheel and axle (b) lever (c) pulley (d) inclined plane
14. 14.💪 Which force is at work: rain falls to the ground? (a) muscular force (b) gravity (c) magnetic force (d) friction
15. 15.⚖️ Going along a lever from one end to the other, the order is: fulcrum, load, effort. Which class of lever is it? (a) class 2 (b) class 1 (c) class 3
16. 16.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 10 N, a glass sheet 3 N, a wooden plank 5 N, a carpet 9 N. How many newtons more were needed on sandpaper than on a glass sheet?
17. 17.⚖️ 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
18. 18.⚖️ A seesaw balances. Asha (110 N) sits 3 m from the pivot on one side; Kabir (? N) sits 1 m from the pivot on the other side. What is the missing weight in newtons?
19. 19.💪 Which force is at work: a rolling ball slows? (a) muscular force (b) gravity (c) friction (d) magnetic force
20. 20.🪝 A load of 560 N hangs from a pulley system in which 2 rope sections hold up the load. What effort is needed, in newtons? (ideal pulleys)
21. 21.True or false: a pair of pliers is a class 1 lever (fulcrum in the middle). (a) False (b) True
22. 22.🔍 Which is the odd one out? (a) a crowbar (b) a claw hammer on a nail (c) a bottle opener (d) a wheelchair ramp
23. 23.⚖️ A seesaw balances. Asha (510 N) sits 2 m from the pivot on one side; Ravi (340 N) sits ? m from the pivot on the other side. What is the missing distance in metres?
24. 24.True or false: a box pushed on carpet gives more friction. (a) True (b) False
25. 25.⚙️ A wedge is … (a) two ramps back to back (b) a bar on a pivot (c) a wheel on a rod (d) a rope on a wheel
26. 26.True or false: pressing a doorbell is a pull. (a) False (b) True
27. 27.🔍 Which is the odd one out? (a) oil on a squeaky hinge (b) a box pushed on carpet (c) powder on a carrom board (d) a smooth steel slide
28. 28.🏋️ A machine lifts a load of 1020 N when you push with 170 N. What is its mechanical advantage (MA)?
29. 29.⚖️ A seesaw balances. Ravi (100 N) sits 2 m from the pivot on one side; Arjun (200 N) sits ? m from the pivot on the other side. What is the missing distance in metres?
30. 30.⚖️ A lever bar balances. The load is 300 N at ? cm from the fulcrum. The effort is 300 N at 30 cm from the fulcrum on the other side. What is the missing distance in centimetres?
31. 31.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 5 N, a carpet 8 N, sandpaper 9 N, a glass sheet 1 N. How many newtons more were needed on sandpaper than on a glass sheet?
32. 32.🔍 Which is the odd one out? (a) a jar lid (b) an axe blade (c) the tip of a nail (d) a chisel
33. 33.🪝 A bucket weighing 20 N is lifted with a single fixed pulley at the top of a well. What effort is needed, in newtons? (ideal pulley, no friction)
34. 34.🔍 Which is the odd one out? (a) a wheelchair ramp (b) an axe blade (c) a road up a hill (d) a playground slide
35. 35.🪝 Fixed or movable pulley: which one is on a flagpole top? (a) a fixed pulley (b) a movable pulley
36. 36.⚖️ A seesaw balances. Ravi (440 N) sits ? m from the pivot on one side; Meena (440 N) sits 4 m from the pivot on the other side. What is the missing distance in metres?
37. 37.🪝 A pulley system lifts a 400 N load with an effort of 100 N. What is its mechanical advantage (MA)?
38. 38.🏋️ A force of 460 N pushes a cart 6 m along the floor. How much work is done, in joules?
39. 39.💪 Is pressing a doorbell a push or a pull? (a) a pull (b) a push
40. 40.💪 A force is a … (a) type of sound (b) kind of colour (c) push or a pull (d) unit of time

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