Engineering Worksheet: Part 2 Test

Engineering lesson 16: Part 2 test: forces and machines · Set 476 · 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 well winch handle? (a) wheel and axle (b) pulley (c) screw (d) lever
2. 2.True or false: a crane hook block is a pulley. (a) False (b) True
3. 3.⚖️ A seesaw balances. Arjun (260 N) sits 1 m from the pivot on one side; Zoya (? N) sits 2 m from the pivot on the other side. What is the missing weight in newtons?
4. 4.🔍 Which is the odd one out? (a) a water tap handle (b) a claw hammer on a nail (c) a seesaw (d) a crowbar
5. 5.⚖️ Along a straight bar, measured from the left end, the effort is at 30 cm, the fulcrum at 50 cm and the load at 10 cm. Which class of lever is it? (a) class 3 (b) class 1 (c) class 2
6. 6.⚖️ A seesaw balances. Zoya (110 N) sits ? m from the pivot on one side; Asha (440 N) sits 1 m from the pivot on the other side. What is the missing distance in metres?
7. 7.💪 Which force is at work: a magnet picks up pins? (a) friction (b) gravity (c) muscular force (d) magnetic force
8. 8.🔍 Which is the odd one out? (a) a smooth steel slide (b) a tyre with deep treads (c) a rough doormat (d) a grippy rubber sole
9. 9.True or false: a movable pulley only changes direction. (a) True (b) False
10. 10.💪 Is pressing a doorbell a push or a pull? (a) a push (b) a pull
11. 11.⚖️ Along a straight bar, measured from the left end, the effort is at 0 cm, the fulcrum at 40 cm and the load at 50 cm. Which class of lever is it? (a) class 3 (b) class 1 (c) class 2
12. 12.💪 Is opening a drawer a push or a pull? (a) a push (b) a pull
13. 13.True or false: a pair of tweezers is a class 3 lever (effort in the middle). (a) True (b) False
14. 14.🪝 A load of 400 N hangs from a pulley system in which 4 rope sections hold up the load. What effort is needed, in newtons? (ideal pulleys)
15. 15.⚖️ Turning effect = force × … (a) colour of bar (b) time taken (c) distance from fulcrum (d) mass of fulcrum
16. 16.🏋️ Work is done when a force moves something … (a) very slowly (b) through a distance (c) without moving it (d) only upwards
17. 17.🛞 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 wooden plank 7 N, a carpet 9 N. How many newtons more were needed on a carpet than on ice?
18. 18.💪 Is pulling up your socks a push or a pull? (a) a push (b) a pull
19. 19.🏋️ A force of 410 N did 3690 J of work. How many metres did the object move?
20. 20.⚖️ A lever bar balances. The load is ? N at 40 cm from the fulcrum. The effort is 280 N at 20 cm from the fulcrum on the other side. What is the missing force in newtons?
21. 21.🪝 A pulley system has 2 rope sections holding up the load. To lift the load by 9 m, how many metres of rope must you pull?
22. 22.🔍 Which is the odd one out? (a) powder on a carrom board (b) a wheel on ball bearings (c) skating on ice (d) a box pushed on carpet
23. 23.⚖️ In a class 3 lever, what is in the middle? (a) the fulcrum (b) the pulley (c) the effort (d) the load
24. 24.True or false: kicking a football is a pull. (a) True (b) False
25. 25.⚖️ Along a straight bar, measured from the left end, the effort is at 70 cm, the fulcrum at 50 cm and the load at 10 cm. Which class of lever is it? (a) class 2 (b) class 1 (c) class 3
26. 26.🛞 How can we reduce friction in a machine? (a) add sand (b) oil the moving parts (c) make parts rough (d) press parts harder
27. 27.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 10 N, ice 2 N, a glass sheet 5 N, a wooden plank 9 N. Which surface gave the least friction? (a) a wooden plank (b) a carpet (c) a glass sheet (d) ice
28. 28.💪 Which force pulls everything towards the Earth? (a) friction (b) magnetism (c) gravity (d) wind
29. 29.🏋️ In which unit is work measured? (a) joule (J) (b) metre (m) (c) newton (N) (d) watt hour
30. 30.True or false: plucking a mango is a pull. (a) True (b) False
31. 31.⚖️ In a class 1 lever, what is in the middle? (a) the effort (b) the load (c) the fulcrum (d) nothing
32. 32.🛞 More or less friction: skating on ice? (a) less friction (b) more friction
33. 33.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 3 N, a carpet 4 N, sandpaper 8 N, ice 1 N. Which surface gave the most friction? (a) a glass sheet (b) a carpet (c) sandpaper (d) ice
34. 34.🏋️ Mechanical advantage (MA) = … (a) load + effort (b) effort ÷ load (c) load × effort (d) load ÷ effort
35. 35.🔍 Which is the odd one out? (a) a knife edge (b) a wheelchair ramp (c) a door stopper (d) an axe blade
36. 36.⚙️ A wedge is … (a) a bar on a pivot (b) a rope on a wheel (c) a wheel on a rod (d) two ramps back to back
37. 37.True or false: a crowbar is a class 3 lever (effort in the middle). (a) False (b) True
38. 38.⚖️ On a seesaw, a heavier child should sit … (a) anywhere (b) closer to the pivot (c) on the pivot (d) farther from the pivot
39. 39.🏋️ A force of 190 N pushes a cart 1 m along the floor. How much work is done, in joules?
40. 40.True or false: sand on a slippery path gives less friction. (a) False (b) True

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