Engineering Worksheet: Part 2 Test

Engineering lesson 16: Part 2 test: forces and machines · Set 899 · 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 simple machine is a knife edge? (a) pulley (b) screw (c) wheel and axle (d) wedge
2. 2.🏋️ A 14 kg box is lifted straight up by 1 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
3. 3.🔍 Which is the odd one out? (a) an axe blade (b) a bottle opener (c) a knife edge (d) the tip of a nail
4. 4.🛞 More or less friction: powder on a carrom board? (a) less friction (b) more friction
5. 5.⚖️ A seesaw balances. Kabir (400 N) sits ? m from the pivot on one side; Arjun (800 N) sits 2 m from the pivot on the other side. What is the missing distance in metres?
6. 6.⚙️ Which simple machine is a road up a hill? (a) wedge (b) wheel and axle (c) inclined plane (d) lever
7. 7.💪 Which force is at work: brakes stop a bicycle? (a) gravity (b) magnetic force (c) friction (d) muscular force
8. 8.⚖️ Which class of lever is a crowbar? (a) class 3 (b) class 2 (c) class 1
9. 9.Which of these is an inclined plane? (a) a crowbar (b) a well winch handle (c) a door stopper (d) a wheelchair ramp
10. 10.💪 Two children push a box to the right, one with 5 N and the other with 20 N. What is the net (total) force on the box, in newtons?
11. 11.⚙️ Which simple machine is a well-bucket rope wheel? (a) screw (b) pulley (c) wheel and axle (d) wedge
12. 12.🏋️ A smooth ramp is 15 m long and rises 3 m. What effort pushes a 3000 N box up it, in newtons? (ideal ramp, no friction)
13. 13.True or false: a wood screw is a screw. (a) False (b) True
14. 14.Which of these is a pulley? (a) a truck loading ramp (b) a screw jack (c) a playground slide (d) a flagpole rope wheel
15. 15.⚙️ Most simple machines make work easier by letting us … (a) stop all friction (b) make new energy (c) use a smaller force (d) switch off gravity
16. 16.🛞 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 8 N, ice 3 N. Which surface gave the least friction? (a) a carpet (b) a glass sheet (c) a wooden plank (d) ice
17. 17.⚖️ A seesaw balances. Zoya (? N) sits 4 m from the pivot on one side; Ravi (800 N) sits 3 m from the pivot on the other side. What is the missing weight in newtons?
18. 18.True or false: a movable pulley hangs on the rope loop. (a) True (b) False
19. 19.⚖️ A lever balances when … (a) the bar is short (b) turning effects match (c) the fulcrum moves (d) both weights are equal
20. 20.True or false: pushing a swing is a pull. (a) False (b) True
21. 21.🛞 Which surface gives the MOST friction to a sliding block? (a) glass (b) sandpaper (c) polished marble (d) ice
22. 22.⚖️ A lever bar balances. The load is 180 N at ? cm from the fulcrum. The effort is 450 N at 20 cm from the fulcrum on the other side. What is the missing distance in centimetres?
23. 23.🏋️ A smooth ramp is 12 m long and rises 2 m. What effort pushes a 1200 N box up it, in newtons? (ideal ramp, no friction)
24. 24.🏋️ A 2 kg box is lifted straight up by 4 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
25. 25.True or false: a movable pulley needs effort = load. (a) True (b) False
26. 26.🔍 Which is the odd one out? (a) a window blind cord (b) a flagpole rope wheel (c) a well-bucket rope wheel (d) a road up a hill
27. 27.🪝 A winch has a wheel of radius 8 cm and an axle of radius 1 cm. What effort on the wheel lifts a 1120 N bucket on the axle, in newtons? (ideal)
28. 28.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 3 N, a glass sheet 6 N, a carpet 8 N, sandpaper 9 N. Which surface gave the least friction? (a) sandpaper (b) ice (c) a carpet (d) a glass sheet
29. 29.🏋️ A smooth ramp is 4 m long and rises 1 m. What effort pushes a 3200 N box up it, in newtons? (ideal ramp, no friction)
30. 30.True or false: a playground slide is a wedge. (a) True (b) False
31. 31.🔍 Which is the odd one out? (a) a smooth steel slide (b) a wet tiled floor (c) powder on a carrom board (d) a grippy rubber sole
32. 32.⚖️ Which class of lever is a pair of scissors? (a) class 1 (b) class 3 (c) class 2
33. 33.🏋️ Pushing a crate 9 m took 810 J of work. What force was used, in newtons?
34. 34.⚖️ On a seesaw, a heavier child should sit … (a) anywhere (b) on the pivot (c) farther from the pivot (d) closer to the pivot
35. 35.⚖️ Which class of lever is a fishing rod? (a) class 1 (b) class 3 (c) class 2
36. 36.⚖️ A seesaw balances. Kabir (390 N) sits 1 m from the pivot on one side; Meena (130 N) sits ? m from the pivot on the other side. What is the missing distance in metres?
37. 37.💪 Which force is at work: rain falls to the ground? (a) muscular force (b) gravity (c) magnetic force (d) friction
38. 38.True or false: plucking a mango is a push. (a) False (b) True
39. 39.⚖️ A lever bar balances. The load is ? N at 50 cm from the fulcrum. The effort is 50 N at 50 cm from the fulcrum on the other side. What is the missing force in newtons?
40. 40.🛞 Why are tyres made with deep treads? (a) to save rubber (b) to look nice (c) to grip the road (d) to go slower

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