Engineering Worksheet: Part 2 Test

Engineering lesson 16: Part 2 test: forces and machines · Set 312 · 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 is the odd one out? (a) chalk on a gym bar (b) sand on a slippery path (c) a tyre with deep treads (d) a smooth steel slide
2. 2.⚖️ 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?
3. 3.True or false: opening a drawer is a push. (a) False (b) True
4. 4.💪 Is drawing up a well bucket a push or a pull? (a) a pull (b) a push
5. 5.⚖️ Along a straight bar, measured from the left end, the effort is at 0 cm, the fulcrum at 10 cm and the load at 20 cm. Which class of lever is it? (a) class 3 (b) class 2 (c) class 1
6. 6.⚖️ Going along a lever from one end to the other, the order is: fulcrum, effort, load. Which class of lever is it? (a) class 1 (b) class 2 (c) class 3
7. 7.🏋️ A force of 290 N pushes a cart 3 m along the floor. How much work is done, in joules?
8. 8.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 1 N, a glass sheet 4 N, a wooden plank 7 N, a carpet 8 N. Which surface gave the most friction? (a) ice (b) a glass sheet (c) a carpet (d) a wooden plank
9. 9.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 5 N, a wooden plank 8 N, sandpaper 9 N, ice 1 N. How many newtons more were needed on sandpaper than on ice?
10. 10.⚖️ A seesaw balances. Ravi (200 N) sits ? m from the pivot on one side; Kabir (600 N) sits 1 m from the pivot on the other side. What is the missing distance in metres?
11. 11.🏋️ A longer ramp to the same height needs … (a) the same effort (b) more effort (c) no effort (d) less effort
12. 12.🪝 Fixed or movable pulley: which one halves the effort? (a) a movable pulley (b) a fixed pulley
13. 13.⚖️ A lever balances when … (a) the fulcrum moves (b) the bar is short (c) turning effects match (d) both weights are equal
14. 14.💪 A bag has a mass of 36 kg. Taking 1 kg to weigh about 10 N, what is its weight in newtons?
15. 15.⚖️ On a seesaw, a heavier child should sit … (a) on the pivot (b) anywhere (c) closer to the pivot (d) farther from the pivot
16. 16.🏋️ A 4 kg box is lifted straight up by 5 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
17. 17.💪 In a tug of war, one team pulls right with 10 N and the other pulls left with 5 N. What is the size of the net force, in newtons?
18. 18.⚖️ A seesaw balances. Ravi (? N) sits 2 m from the pivot on one side; Zoya (220 N) sits 4 m from the pivot on the other side. What is the missing weight in newtons?
19. 19.🪝 A load of 240 N hangs from a pulley system in which 2 rope sections hold up the load. What effort is needed, in newtons? (ideal pulleys)
20. 20.🏋️ A force of 410 N pushes a cart 4 m along the floor. How much work is done, in joules?
21. 21.True or false: a rough doormat gives less friction. (a) True (b) False
22. 22.💪 Is opening a drawer a push or a pull? (a) a push (b) a pull
23. 23.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 8 N, ice 2 N, a glass sheet 5 N, a wooden plank 7 N. How many newtons more were needed on sandpaper than on ice?
24. 24.⚙️ A wedge is … (a) a rope on a wheel (b) a bar on a pivot (c) a wheel on a rod (d) two ramps back to back
25. 25.⚖️ A seesaw balances. Kabir (510 N) sits ? m from the pivot on one side; Zoya (170 N) sits 3 m from the pivot on the other side. What is the missing distance in metres?
26. 26.⚖️ A lever bar balances. The load is ? N at 10 cm from the fulcrum. The effort is 20 N at 40 cm from the fulcrum on the other side. What is the missing force in newtons?
27. 27.⚖️ Along a straight bar, measured from the left end, the effort is at 20 cm, the fulcrum at 30 cm and the load at 60 cm. Which class of lever is it? (a) class 1 (b) class 3 (c) class 2
28. 28.Which of these is caused by magnetic force? (a) a river flows downhill (b) squeezing a lemon (c) a magnet picks up pins (d) shoes grip the floor
29. 29.⚖️ To lift a heavy rock with a crowbar more easily, push … (a) on the fulcrum (b) on the rock (c) near the fulcrum (d) far from the fulcrum
30. 30.🛞 More or less friction: powder on a carrom board? (a) more friction (b) less friction
31. 31.Which of these is caused by friction? (a) an apple falls down (b) rain falls to the ground (c) a compass needle turns (d) shoes grip the floor
32. 32.🛞 Why are tyres made with deep treads? (a) to look nice (b) to go slower (c) to save rubber (d) to grip the road
33. 33.🏋️ Can a simple machine reduce the work done? (a) only on Mondays (b) yes, by half (c) yes, always (d) no, work stays the same
34. 34.🪝 What does a single fixed pulley change? (a) gravity (b) the colour of rope (c) the size of the load (d) the direction of pull
35. 35.💪 In a tug of war, one team pulls right with 35 N and the other pulls left with 30 N. What is the size of the net force, in newtons?
36. 36.🔍 Which is the odd one out? (a) a jar lid (b) a screw jack (c) a wood screw (d) a round doorknob
37. 37.⚖️ Which class of lever is a crowbar? (a) class 2 (b) class 3 (c) class 1
38. 38.🔍 Which is the odd one out? (a) a crane hook block (b) a claw hammer on a nail (c) a flagpole rope wheel (d) a well-bucket rope wheel
39. 39.🏋️ A force of 460 N did 2760 J of work. How many metres did the object move?
40. 40.🪝 A well winch has a handle (wheel) of radius 4 cm turning an axle of radius 1 cm. What is its mechanical advantage (MA)?

Free engineering lessons, practice and worksheets at talentjr.in/engineering-for-kids