Engineering Worksheet: Part 2 Test

Engineering lesson 16: Part 2 test: forces and machines · Set 192 · 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 nutcracker is an inclined plane. (a) True (b) False
2. 2.⚙️ Which simple machine is a bottle opener? (a) wedge (b) screw (c) inclined plane (d) lever
3. 3.⚖️ A seesaw balances. Arjun (450 N) sits ? m from the pivot on one side; Kabir (450 N) sits 3 m from the pivot on the other side. What is the missing distance in metres?
4. 4.🪝 Fixed or movable pulley: which one stays in one place? (a) a movable pulley (b) a fixed pulley
5. 5.🪝 A pulley system has 1 rope section holding up the load. To lift the load by 3 m, how many metres of rope must you pull?
6. 6.⚖️ A seesaw balances. Arjun (180 N) sits ? m from the pivot on one side; Ravi (360 N) sits 1 m from the pivot on the other side. What is the missing distance in metres?
7. 7.True or false: a movable pulley makes you pull 2× rope. (a) False (b) True
8. 8.🏋️ In which unit is work measured? (a) watt hour (b) metre (m) (c) newton (N) (d) joule (J)
9. 9.⚙️ Which simple machine is a door stopper? (a) wheel and axle (b) wedge (c) lever (d) screw
10. 10.True or false: a tyre with deep treads gives more friction. (a) True (b) False
11. 11.⚙️ Which simple machine is a round doorknob? (a) wheel and axle (b) lever (c) screw (d) inclined plane
12. 12.🛞 More or less friction: powder on a carrom board? (a) less friction (b) more friction
13. 13.🏋️ A 2 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.🛞 More or less friction: a rough doormat? (a) more friction (b) less friction
15. 15.⚙️ Which simple machine is a window blind cord? (a) screw (b) pulley (c) lever (d) wheel and axle
16. 16.🔍 Which is the odd one out? (a) a door stopper (b) the tip of a nail (c) an axe blade (d) a nutcracker
17. 17.🏋️ Can a simple machine reduce the work done? (a) yes, always (b) yes, by half (c) only on Mondays (d) no, work stays the same
18. 18.⚖️ In a class 1 lever, what is in the middle? (a) the fulcrum (b) nothing (c) the load (d) the effort
19. 19.🛞 More or less friction: skating on ice? (a) more friction (b) less friction
20. 20.⚖️ A lever balances when … (a) both weights are equal (b) the bar is short (c) the fulcrum moves (d) turning effects match
21. 21.True or false: powder on a carrom board gives more friction. (a) False (b) True
22. 22.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 4 N, a wooden plank 5 N, a carpet 9 N, ice 2 N. Which surface gave the least friction? (a) a wooden plank (b) ice (c) a glass sheet (d) a carpet
23. 23.Which of these is caused by friction? (a) a rolling ball slows (b) an apple falls down (c) lifting a school bag (d) a compass needle turns
24. 24.💪 Is opening a drawer a push or a pull? (a) a pull (b) a push
25. 25.⚖️ A lever bar balances. The load is ? N at 50 cm from the fulcrum. The effort is 400 N at 30 cm from the fulcrum on the other side. What is the missing force in newtons?
26. 26.🏋️ A machine lifts a load of 800 N when you push with 160 N. What is its mechanical advantage (MA)?
27. 27.⚖️ On a seesaw, a heavier child should sit … (a) on the pivot (b) anywhere (c) closer to the pivot (d) farther from the pivot
28. 28.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 5 N, a carpet 6 N, sandpaper 7 N, a glass sheet 2 N. Which surface gave the least friction? (a) sandpaper (b) a wooden plank (c) a carpet (d) a glass sheet
29. 29.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 10 N, a glass sheet 1 N, a wooden plank 5 N, a carpet 8 N. Which surface gave the least friction? (a) sandpaper (b) a glass sheet (c) a carpet (d) a wooden plank
30. 30.⚖️ A lever bar balances. The load is ? N at 40 cm from the fulcrum. The effort is 120 N at 100 cm from the fulcrum on the other side. What is the missing force in newtons?
31. 31.🪝 Fixed or movable pulley: which one only changes direction? (a) a fixed pulley (b) a movable pulley
32. 32.True or false: a fixed pulley needs effort = load. (a) False (b) True
33. 33.💪 In a tug of war, one team pulls left with 60 N and the other pulls right with 10 N. What is the size of the net force, in newtons?
34. 34.🔍 Which is the odd one out? (a) chalk on a gym bar (b) a rough doormat (c) a tyre with deep treads (d) skating on ice
35. 35.🪝 Fixed or movable pulley: which one hangs on the rope loop? (a) a movable pulley (b) a fixed pulley
36. 36.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 11 N, sandpaper 12 N, ice 4 N, a glass sheet 8 N. How many newtons more were needed on sandpaper than on ice?
37. 37.🏋️ A force of 170 N did 1700 J of work. How many metres did the object move?
38. 38.🏋️ A force of 20 N did 100 J of work. How many metres did the object move?
39. 39.🪝 Fixed or movable pulley: which one needs effort = load? (a) a movable pulley (b) a fixed pulley
40. 40.⚖️ In a class 2 lever, what is in the middle? (a) the fulcrum (b) the load (c) the axle (d) the effort

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