Engineering Worksheet: Part 2 Test

Engineering lesson 16: Part 2 test: forces and machines · Set 640 · 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 of these is a pulley? (a) a well-bucket rope wheel (b) a nutcracker (c) a jar lid (d) a seesaw
2. 2.🛞 Which surface gives the MOST friction to a sliding block? (a) polished marble (b) ice (c) glass (d) sandpaper
3. 3.True or false: a wet tiled floor gives less friction. (a) False (b) True
4. 4.⚙️ Which simple machine is a screw jack? (a) wheel and axle (b) inclined plane (c) pulley (d) screw
5. 5.⚖️ Which class of lever is your forearm? (a) class 1 (b) class 2 (c) class 3
6. 6.True or false: a jar lid is a wedge. (a) True (b) False
7. 7.⚖️ A seesaw balances. Arjun (? N) sits 2 m from the pivot on one side; Meena (320 N) sits 4 m from the pivot on the other side. What is the missing weight in newtons?
8. 8.True or false: a grippy rubber sole gives less friction. (a) False (b) True
9. 9.True or false: a movable pulley needs effort = load. (a) False (b) True
10. 10.⚖️ In a class 2 lever, what is in the middle? (a) the effort (b) the axle (c) the load (d) the fulcrum
11. 11.True or false: a bottle cap is a screw. (a) False (b) True
12. 12.🪝 Fixed or movable pulley: which one only changes direction? (a) a fixed pulley (b) a movable pulley
13. 13.🪝 More rope sections holding a load means … (a) no change (b) more effort needed (c) less effort needed (d) the load floats
14. 14.💪 In a tug of war, one team pulls right with 35 N and the other pulls left with 25 N. What is the size of the net force, in newtons?
15. 15.Which of these is caused by muscular force? (a) brakes stop a bicycle (b) a fridge magnet sticks (c) squeezing a lemon (d) a compass needle turns
16. 16.⚖️ A lever bar balances. The load is 720 N at ? cm from the fulcrum. The effort is 240 N at 90 cm from the fulcrum on the other side. What is the missing distance in centimetres?
17. 17.🪝 A well winch has a handle (wheel) of radius 14 cm turning an axle of radius 2 cm. What is its mechanical advantage (MA)?
18. 18.💪 Two children push a box to the right, one with 30 N and the other with 60 N. What is the net (total) force on the box, in newtons?
19. 19.💪 A bag has a mass of 5 kg. Taking 1 kg to weigh about 10 N, what is its weight in newtons?
20. 20.🛞 More or less friction: powder on a carrom board? (a) more friction (b) less friction
21. 21.🏋️ Pushing a crate 3 m took 240 J of work. What force was used, in newtons?
22. 22.🪝 A bucket weighing 470 N is lifted with a single fixed pulley at the top of a well. What effort is needed, in newtons? (ideal pulley, no friction)
23. 23.💪 Is pulling a cart a push or a pull? (a) a push (b) a pull
24. 24.🛞 Rubbing your hands fast makes them … (a) warm (b) wet (c) magnetic (d) cold
25. 25.🪝 A pulley system has 3 rope sections holding up the load. To lift the load by 10 m, how many metres of rope must you pull?
26. 26.True or false: your forearm is a class 3 lever (effort in the middle). (a) False (b) True
27. 27.⚖️ In a class 3 lever, what is in the middle? (a) the fulcrum (b) the pulley (c) the load (d) the effort
28. 28.True or false: pushing a swing is a push. (a) True (b) False
29. 29.🏋️ Work is done when a force moves something … (a) through a distance (b) only upwards (c) very slowly (d) without moving it
30. 30.⚙️ How many simple machines are there in the usual list? (a) 3 (b) 12 (c) 6 (d) 10
31. 31.💪 Which force is at work: rubbing hands warms them? (a) gravity (b) friction (c) magnetic force (d) muscular force
32. 32.⚖️ A lever bar balances. The load is ? N at 20 cm from the fulcrum. The effort is 40 N at 40 cm from the fulcrum on the other side. What is the missing force in newtons?
33. 33.🛞 More or less friction: a box pushed on carpet? (a) less friction (b) more friction
34. 34.True or false: closing a drawer is a push. (a) True (b) False
35. 35.True or false: pushing a trolley is a pull. (a) True (b) False
36. 36.🔍 Which is the odd one out? (a) a chisel (b) a road up a hill (c) a wheelchair ramp (d) a playground slide
37. 37.⚖️ Along a straight bar, measured from the left end, the effort is at 60 cm, the fulcrum at 40 cm and the load at 30 cm. Which class of lever is it? (a) class 2 (b) class 1 (c) class 3
38. 38.🪝 Fixed or movable pulley: which one needs effort = load? (a) a fixed pulley (b) a movable pulley
39. 39.⚖️ On a seesaw, a heavier child should sit … (a) on the pivot (b) farther from the pivot (c) closer to the pivot (d) anywhere
40. 40.⚖️ A lever bar balances. The load is 210 N at 10 cm from the fulcrum. The effort is ? N at 70 cm from the fulcrum on the other side. What is the missing force in newtons?

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