Engineering Worksheet: Part 2 Test

Engineering lesson 16: Part 2 test: forces and machines · Set 917 · 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.⚖️ On a seesaw, a heavier child should sit … (a) farther from the pivot (b) closer to the pivot (c) on the pivot (d) anywhere
2. 2.🛞 Friction acts … (a) against the motion (b) only upwards (c) only on ice (d) with the motion
3. 3.Which of these is a wheel and axle? (a) a seesaw (b) a playground slide (c) a water tap handle (d) a truck loading ramp
4. 4.True or false: a round doorknob is a screw. (a) False (b) True
5. 5.💪 Which force is at work: a river flows downhill? (a) magnetic force (b) gravity (c) muscular force (d) friction
6. 6.🛞 How can we reduce friction in a machine? (a) oil the moving parts (b) add sand (c) press parts harder (d) make parts rough
7. 7.🪝 A wheel and axle is a big wheel fixed to … (a) a flat ramp (b) a smaller rod (axle) (c) a loose rope (d) a sharp wedge
8. 8.💪 Is plucking a mango a push or a pull? (a) a pull (b) a push
9. 9.⚖️ A lever bar balances. The load is 800 N at 30 cm from the fulcrum. The effort is ? N at 100 cm from the fulcrum on the other side. What is the missing force in newtons?
10. 10.⚖️ A lever bar balances. The load is 400 N at 50 cm from the fulcrum. The effort is ? N at 80 cm from the fulcrum on the other side. What is the missing force in newtons?
11. 11.💪 In a tug of war, one team pulls left with 85 N and the other pulls right with 45 N. What is the size of the net force, in newtons?
12. 12.🛞 Is friction helpful or a problem here: a door hinge squeaking? (a) a problem (b) helpful
13. 13.True or false: a pair of pliers is a class 1 lever (fulcrum in the middle). (a) False (b) True
14. 14.⚖️ To lift a heavy rock with a crowbar more easily, push … (a) far from the fulcrum (b) on the rock (c) on the fulcrum (d) near the fulcrum
15. 15.🏋️ A 2 kg box is lifted straight up by 3 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
16. 16.⚙️ Which simple machine is a round doorknob? (a) wedge (b) pulley (c) wheel and axle (d) screw
17. 17.True or false: a crane hook block is a pulley. (a) False (b) True
18. 18.⚖️ A lever bar balances. The load is 100 N at ? cm from the fulcrum. The effort is 50 N at 100 cm from the fulcrum on the other side. What is the missing distance in centimetres?
19. 19.💪 Is kicking a football a push or a pull? (a) a push (b) a pull
20. 20.💪 Which force is at work: squeezing a lemon? (a) magnetic force (b) muscular force (c) gravity (d) friction
21. 21.⚖️ Which class of lever is a bottle opener? (a) class 3 (b) class 2 (c) class 1
22. 22.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 2 N, a wooden plank 3 N, a carpet 4 N, sandpaper 5 N. Which surface gave the most friction? (a) a carpet (b) a glass sheet (c) sandpaper (d) a wooden plank
23. 23.🪝 Fixed or movable pulley: which one is on a flagpole top? (a) a fixed pulley (b) a movable pulley
24. 24.⚖️ Going along a lever from one end to the other, the order is: load, effort, fulcrum. Which class of lever is it? (a) class 1 (b) class 3 (c) class 2
25. 25.💪 In a tug of war, one team pulls left with 95 N and the other pulls right with 50 N. What is the size of the net force, in newtons?
26. 26.🏋️ A 15 kg box is lifted straight up by 5 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
27. 27.💪 In a tug of war, one team pulls right with 20 N and the other pulls left with 5 N. What is the size of the net force, in newtons?
28. 28.🛞 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 5 N, ice 1 N. How many newtons more were needed on sandpaper than on ice?
29. 29.💪 Is a tug of war a push or a pull? (a) a pull (b) a push
30. 30.💪 A bag has a mass of 53 kg. Taking 1 kg to weigh about 10 N, what is its weight in newtons?
31. 31.⚖️ A lever bar balances. The load is 20 N at 40 cm from the fulcrum. The effort is 40 N at ? cm from the fulcrum on the other side. What is the missing distance in centimetres?
32. 32.True or false: a movable pulley only changes direction. (a) True (b) False
33. 33.⚖️ A lever bar balances. The load is 160 N at 10 cm from the fulcrum. The effort is ? N at 20 cm from the fulcrum on the other side. What is the missing force in newtons?
34. 34.🏋️ A machine lifts a load of 540 N when you push with 180 N. What is its mechanical advantage (MA)?
35. 35.⚖️ A seesaw balances. Zoya (340 N) sits ? m from the pivot on one side; Meena (510 N) sits 2 m from the pivot on the other side. What is the missing distance in metres?
36. 36.🪝 A load of 210 N hangs from a pulley system in which 3 rope sections hold up the load. What effort is needed, in newtons? (ideal pulleys)
37. 37.🪝 A load of 500 N hangs from a pulley system in which 2 rope sections hold up the load. What effort is needed, in newtons? (ideal pulleys)
38. 38.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 5 N, a carpet 6 N, sandpaper 9 N, ice 4 N. Which surface gave the least friction? (a) ice (b) a glass sheet (c) sandpaper (d) a carpet
39. 39.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 7 N, sandpaper 8 N, a glass sheet 2 N, a wooden plank 3 N. Which surface gave the most friction? (a) a wooden plank (b) sandpaper (c) a glass sheet (d) a carpet
40. 40.⚖️ Turning effect = force × … (a) mass of fulcrum (b) distance from fulcrum (c) time taken (d) colour of bar

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