Engineering Worksheet: Part 2 Test

Engineering lesson 16: Part 2 test: forces and machines · Set 653 · 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 movable pulley hangs on the rope loop. (a) True (b) False
2. 2.🏋️ Pushing a crate 10 m took 3400 J of work. What force was used, in newtons?
3. 3.🛞 Is friction helpful or a problem here: machine parts heating up? (a) helpful (b) a problem
4. 4.🔍 Which is the odd one out? (a) chalk on a gym bar (b) a box pushed on carpet (c) sand on a slippery path (d) a wheel on ball bearings
5. 5.⚖️ A lever bar balances. The load is 500 N at 30 cm from the fulcrum. The effort is ? N at 50 cm from the fulcrum on the other side. What is the missing force in newtons?
6. 6.⚙️ Most simple machines make work easier by letting us … (a) switch off gravity (b) stop all friction (c) use a smaller force (d) make new energy
7. 7.⚖️ Turning effect = force × … (a) colour of bar (b) time taken (c) mass of fulcrum (d) distance from fulcrum
8. 8.⚖️ Along a straight bar, measured from the left end, the effort is at 50 cm, the fulcrum at 30 cm and the load at 60 cm. Which class of lever is it? (a) class 1 (b) class 2 (c) class 3
9. 9.⚙️ Which simple machine is a road up a hill? (a) pulley (b) inclined plane (c) lever (d) wheel and axle
10. 10.True or false: sand on a slippery path gives more friction. (a) False (b) True
11. 11.⚖️ In a class 1 lever, what is in the middle? (a) the effort (b) the load (c) nothing (d) the fulcrum
12. 12.⚖️ A seesaw balances. Asha (360 N) sits 2 m from the pivot on one side; Kabir (? N) sits 2 m from the pivot on the other side. What is the missing weight in newtons?
13. 13.⚖️ Which class of lever is a pair of pliers? (a) class 2 (b) class 3 (c) class 1
14. 14.💪 Which force is at work: a rolling ball slows? (a) magnetic force (b) friction (c) gravity (d) muscular force
15. 15.⚖️ Which class of lever is a broom when sweeping? (a) class 3 (b) class 1 (c) class 2
16. 16.🛞 More or less friction: a box pushed on carpet? (a) more friction (b) less friction
17. 17.💪 A bag has a mass of 21 kg. Taking 1 kg to weigh about 10 N, what is its weight in newtons?
18. 18.⚖️ A lever bar balances. The load is 540 N at 10 cm from the fulcrum. The effort is ? N at 90 cm from the fulcrum on the other side. What is the missing force in newtons?
19. 19.⚖️ A lever bar balances. The load is ? N at 40 cm from the fulcrum. The effort is 40 N at 80 cm from the fulcrum on the other side. What is the missing force in newtons?
20. 20.🪝 A winch has a wheel of radius 4 cm and an axle of radius 2 cm. What effort on the wheel lifts a 240 N bucket on the axle, in newtons? (ideal)
21. 21.🔍 Which is the odd one out? (a) a crane hook block (b) a well-bucket rope wheel (c) a window blind cord (d) a seesaw
22. 22.🛞 How can we reduce friction in a machine? (a) make parts rough (b) press parts harder (c) add sand (d) oil the moving parts
23. 23.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 4 N, a carpet 6 N, sandpaper 7 N, ice 3 N. Which surface gave the least friction? (a) a carpet (b) ice (c) a glass sheet (d) sandpaper
24. 24.💪 Which force is at work: a magnet picks up pins? (a) magnetic force (b) friction (c) gravity (d) muscular force
25. 25.⚖️ A seesaw balances. Arjun (400 N) sits 1 m from the pivot on one side; Zoya (100 N) sits ? m from the pivot on the other side. What is the missing distance in metres?
26. 26.🏋️ A force of 390 N did 780 J of work. How many metres did the object move?
27. 27.True or false: a pair of scissors is a class 2 lever (load in the middle). (a) False (b) True
28. 28.True or false: a well winch handle is a wheel and axle. (a) True (b) False
29. 29.True or false: powder on a carrom board gives less friction. (a) False (b) True
30. 30.🪝 A pulley system has 1 rope section holding up the load. To lift the load by 9 m, how many metres of rope must you pull?
31. 31.True or false: a rough doormat gives less friction. (a) True (b) False
32. 32.🪝 A pulley system has 2 rope sections holding up the load. To lift the load by 1 m, how many metres of rope must you pull?
33. 33.🏋️ A force of 450 N pushes a cart 9 m along the floor. How much work is done, in joules?
34. 34.💪 A box weighs 130 N. Taking 1 kg to weigh about 10 N, what is its mass in kilograms?
35. 35.🪝 A winch has a wheel of radius 24 cm and an axle of radius 3 cm. What effort on the wheel lifts a 1360 N bucket on the axle, in newtons? (ideal)
36. 36.🛞 More or less friction: powder on a carrom board? (a) less friction (b) more friction
37. 37.⚖️ A seesaw balances. Ravi (320 N) sits 4 m from the pivot on one side; Asha (? N) sits 2 m from the pivot on the other side. What is the missing weight in newtons?
38. 38.⚙️ How many simple machines are there in the usual list? (a) 12 (b) 10 (c) 6 (d) 3
39. 39.💪 Two children push a box to the right, one with 65 N and the other with 25 N. What is the net (total) force on the box, in newtons?
40. 40.💪 A force is a … (a) type of sound (b) kind of colour (c) unit of time (d) push or a pull

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