Engineering Worksheet: Part 2 Test

Engineering lesson 16: Part 2 test: forces and machines · Set 234 · 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 winch has a wheel of radius 20 cm and an axle of radius 5 cm. What effort on the wheel lifts a 200 N bucket on the axle, in newtons? (ideal)
2. 2.⚖️ Turning effect = force × … (a) time taken (b) colour of bar (c) mass of fulcrum (d) distance from fulcrum
3. 3.Which of these is caused by friction? (a) a compass needle turns (b) a thrown ball comes down (c) shoes grip the floor (d) a river flows downhill
4. 4.🔍 Which is the odd one out? (a) sand on a slippery path (b) a grippy rubber sole (c) a box pushed on carpet (d) a smooth steel slide
5. 5.💪 Which force is at work: lifting a school bag? (a) muscular force (b) friction (c) magnetic force (d) gravity
6. 6.🏋️ Pushing a crate 10 m took 1000 J of work. What force was used, in newtons?
7. 7.True or false: an axe blade is a wedge. (a) True (b) False
8. 8.🪝 Fixed or movable pulley: which one only changes direction? (a) a fixed pulley (b) a movable pulley
9. 9.⚖️ A seesaw balances. Ravi (100 N) sits ? m from the pivot on one side; Kabir (200 N) sits 1 m from the pivot on the other side. What is the missing distance in metres?
10. 10.True or false: a movable pulley rises with the load. (a) True (b) False
11. 11.True or false: a crane hook block is a pulley. (a) True (b) False
12. 12.🛞 Is friction helpful or a problem here: writing with a pencil? (a) a problem (b) helpful
13. 13.🏋️ A 17 kg box is lifted straight up by 5 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
14. 14.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 11 N, ice 1 N, a glass sheet 4 N, a wooden plank 8 N. Which surface gave the least friction? (a) sandpaper (b) ice (c) a glass sheet (d) a wooden plank
15. 15.⚖️ Along a straight bar, measured from the left end, the effort is at 80 cm, the fulcrum at 50 cm and the load at 10 cm. Which class of lever is it? (a) class 1 (b) class 2 (c) class 3
16. 16.True or false: pulling up your socks is a push. (a) False (b) True
17. 17.🏋️ A machine lifts a load of 450 N when you push with 150 N. What is its mechanical advantage (MA)?
18. 18.💪 Is pulling up your socks a push or a pull? (a) a pull (b) a push
19. 19.🪝 Fixed or movable pulley: which one stays in one place? (a) a movable pulley (b) a fixed pulley
20. 20.💪 Which force pulls everything towards the Earth? (a) friction (b) magnetism (c) wind (d) gravity
21. 21.💪 Which force is at work: pedalling a cycle? (a) muscular force (b) gravity (c) magnetic force (d) friction
22. 22.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 3 N, a wooden plank 6 N, a carpet 8 N, sandpaper 12 N. Which surface gave the least friction? (a) sandpaper (b) a wooden plank (c) a carpet (d) a glass sheet
23. 23.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 8 N, sandpaper 11 N, ice 2 N, a glass sheet 4 N. Which surface gave the least friction? (a) a glass sheet (b) a wooden plank (c) ice (d) sandpaper
24. 24.🔍 Which is the odd one out? (a) a tyre with deep treads (b) a rough doormat (c) a wet tiled floor (d) a box pushed on carpet
25. 25.⚖️ Which class of lever is a pair of tweezers? (a) class 1 (b) class 3 (c) class 2
26. 26.🏋️ A smooth ramp is 6 m long and rises 3 m. What effort pushes a 500 N box up it, in newtons? (ideal ramp, no friction)
27. 27.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 8 N, ice 1 N, a glass sheet 5 N, a wooden plank 7 N. Which surface gave the least friction? (a) a wooden plank (b) a glass sheet (c) ice (d) a carpet
28. 28.⚖️ A seesaw balances. Asha (160 N) sits 3 m from the pivot on one side; Meena (? N) sits 1 m from the pivot on the other side. What is the missing weight in newtons?
29. 29.💪 Two children push a box to the right, one with 30 N and the other with 35 N. What is the net (total) force on the box, in newtons?
30. 30.⚖️ A seesaw balances. Meena (340 N) sits 4 m from the pivot on one side; Ravi (680 N) sits ? m from the pivot on the other side. What is the missing distance in metres?
31. 31.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 1 N, a glass sheet 2 N, a carpet 4 N, sandpaper 7 N. Which surface gave the most friction? (a) a carpet (b) a glass sheet (c) sandpaper (d) ice
32. 32.🪝 More rope sections holding a load means … (a) the load floats (b) less effort needed (c) no change (d) more effort needed
33. 33.Which of these is a wedge? (a) a well-bucket rope wheel (b) a crowbar (c) a knife edge (d) a crane hook block
34. 34.🏋️ 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?
35. 35.⚖️ A lever bar balances. The load is 80 N at ? cm from the fulcrum. The effort is 60 N at 40 cm from the fulcrum on the other side. What is the missing distance in centimetres?
36. 36.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 6 N, a wooden plank 7 N, sandpaper 9 N, ice 3 N. Which surface gave the least friction? (a) a wooden plank (b) ice (c) a glass sheet (d) sandpaper
37. 37.⚖️ Which class of lever is a seesaw? (a) class 3 (b) class 2 (c) class 1
38. 38.True or false: a tyre with deep treads gives more friction. (a) True (b) False
39. 39.⚖️ A lever balances when … (a) both weights are equal (b) turning effects match (c) the fulcrum moves (d) the bar is short
40. 40.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 4 N, a carpet 5 N, sandpaper 9 N, a glass sheet 1 N. Which surface gave the most friction? (a) sandpaper (b) a glass sheet (c) a wooden plank (d) a carpet

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