Engineering Worksheet: Part 2 Test

Engineering lesson 16: Part 2 test: forces and machines · Set 434 · 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.True or false: a claw hammer on a nail is a lever. (a) False (b) True
2. 2.⚖️ Along a straight bar, measured from the left end, the effort is at 80 cm, the fulcrum at 20 cm and the load at 60 cm. Which class of lever is it? (a) class 2 (b) class 1 (c) class 3
3. 3.🏋️ A smooth ramp is 18 m long and rises 3 m. What effort pushes a 3600 N box up it, in newtons? (ideal ramp, no friction)
4. 4.💪 Is pulling up your socks a push or a pull? (a) a push (b) a pull
5. 5.⚖️ A seesaw balances. Ravi (260 N) sits ? m from the pivot on one side; Zoya (520 N) sits 2 m from the pivot on the other side. What is the missing distance in metres?
6. 6.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 10 N, ice 2 N, a glass sheet 4 N, a carpet 8 N. Which surface gave the most friction? (a) a carpet (b) a glass sheet (c) sandpaper (d) ice
7. 7.⚙️ Which simple machine is a playground slide? (a) lever (b) wedge (c) inclined plane (d) pulley
8. 8.Which of these is caused by magnetic force? (a) shoes grip the floor (b) a magnet picks up pins (c) pedalling a cycle (d) rain falls to the ground
9. 9.🛞 More or less friction: oil on a squeaky hinge? (a) less friction (b) more friction
10. 10.⚖️ On a seesaw, a heavier child should sit … (a) farther from the pivot (b) anywhere (c) closer to the pivot (d) on the pivot
11. 11.⚖️ A lever bar balances. The load is 210 N at ? cm from the fulcrum. The effort is 70 N at 30 cm from the fulcrum on the other side. What is the missing distance in centimetres?
12. 12.🛞 More or less friction: powder on a carrom board? (a) less friction (b) more friction
13. 13.🛞 How can we reduce friction in a machine? (a) press parts harder (b) add sand (c) oil the moving parts (d) make parts rough
14. 14.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 6 N, a carpet 9 N, sandpaper 10 N, a glass sheet 2 N. Which surface gave the least friction? (a) sandpaper (b) a carpet (c) a wooden plank (d) a glass sheet
15. 15.🪝 A pulley system has 2 rope sections holding up the load. To lift the load by 7 m, how many metres of rope must you pull?
16. 16.🪝 More rope sections holding a load means … (a) more effort needed (b) the load floats (c) no change (d) less effort needed
17. 17.⚖️ A seesaw balances. Meena (560 N) sits 1 m from the pivot on one side; Zoya (140 N) sits ? m from the pivot on the other side. What is the missing distance in metres?
18. 18.⚖️ In a class 2 lever, what is in the middle? (a) the fulcrum (b) the effort (c) the axle (d) the load
19. 19.🔍 Which is the odd one out? (a) a smooth steel slide (b) a tyre with deep treads (c) skating on ice (d) oil on a squeaky hinge
20. 20.🏋️ Pushing a crate 8 m took 3520 J of work. What force was used, in newtons?
21. 21.⚙️ Which simple machine is a flagpole rope wheel? (a) pulley (b) wheel and axle (c) wedge (d) inclined plane
22. 22.True or false: oil on a squeaky hinge gives more friction. (a) True (b) False
23. 23.⚖️ 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
24. 24.⚖️ A seesaw balances. Arjun (? N) sits 4 m from the pivot on one side; Zoya (520 N) sits 4 m from the pivot on the other side. What is the missing weight in newtons?
25. 25.True or false: plucking a mango is a pull. (a) False (b) True
26. 26.🛞 Is friction helpful or a problem here: brakes stopping a cycle? (a) a problem (b) helpful
27. 27.⚙️ A wedge is … (a) a wheel on a rod (b) two ramps back to back (c) a rope on a wheel (d) a bar on a pivot
28. 28.⚖️ A lever bar balances. The load is ? N at 40 cm from the fulcrum. The effort is 160 N at 20 cm from the fulcrum on the other side. What is the missing force in newtons?
29. 29.⚖️ To lift a heavy rock with a crowbar more easily, push … (a) near the fulcrum (b) far from the fulcrum (c) on the rock (d) on the fulcrum
30. 30.🏋️ A machine lifts a load of 350 N when you push with 70 N. What is its mechanical advantage (MA)?
31. 31.🛞 More or less friction: a wet tiled floor? (a) less friction (b) more friction
32. 32.🔍 Which is the odd one out? (a) a knife edge (b) the tip of a nail (c) an axe blade (d) a well-bucket rope wheel
33. 33.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 2 N, a glass sheet 4 N, a wooden plank 7 N, sandpaper 9 N. Which surface gave the most friction? (a) a wooden plank (b) sandpaper (c) a glass sheet (d) ice
34. 34.True or false: a fixed pulley rises with the load. (a) True (b) False
35. 35.💪 Which force is at work: pedalling a cycle? (a) gravity (b) magnetic force (c) friction (d) muscular force
36. 36.🛞 Which surface gives the MOST friction to a sliding block? (a) glass (b) sandpaper (c) polished marble (d) ice
37. 37.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 11 N, ice 1 N, a wooden plank 3 N, a carpet 7 N. Which surface gave the least friction? (a) ice (b) a wooden plank (c) sandpaper (d) a carpet
38. 38.⚖️ A lever bar balances. The load is 150 N at ? cm from the fulcrum. The effort is 30 N at 50 cm from the fulcrum on the other side. What is the missing distance in centimetres?
39. 39.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 9 N, sandpaper 11 N, a glass sheet 2 N, a wooden plank 6 N. How many newtons more were needed on sandpaper than on a glass sheet?
40. 40.🏋️ Work is done when a force moves something … (a) through a distance (b) only upwards (c) very slowly (d) without moving it

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