Engineering Worksheet: Part 2 Test

Engineering lesson 16: Part 2 test: forces and machines · Set 55 · 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 caused by gravity? (a) a compass needle turns (b) rain falls to the ground (c) a fridge magnet sticks (d) rubbing hands warms them
2. 2.🏋️ Pushing a crate 9 m took 720 J of work. What force was used, in newtons?
3. 3.⚖️ A lever bar balances. The load is ? N at 50 cm from the fulcrum. The effort is 450 N at 50 cm from the fulcrum on the other side. What is the missing force in newtons?
4. 4.🛞 More or less friction: a wheel on ball bearings? (a) more friction (b) less friction
5. 5.🛞 Is friction helpful or a problem here: a knot holding a rope? (a) helpful (b) a problem
6. 6.⚖️ Along a straight bar, measured from the left end, the effort is at 30 cm, the fulcrum at 40 cm and the load at 60 cm. Which class of lever is it? (a) class 2 (b) class 1 (c) class 3
7. 7.⚖️ A seesaw balances. Ravi (? N) sits 4 m from the pivot on one side; Meena (400 N) sits 4 m from the pivot on the other side. What is the missing weight in newtons?
8. 8.⚖️ Along a straight bar, measured from the left end, the effort is at 20 cm, the fulcrum at 60 cm and the load at 0 cm. Which class of lever is it? (a) class 3 (b) class 1 (c) class 2
9. 9.⚖️ In a class 3 lever, what is in the middle? (a) the fulcrum (b) the effort (c) the pulley (d) the load
10. 10.⚖️ A lever bar balances. The load is 420 N at ? cm from the fulcrum. The effort is 60 N at 70 cm from the fulcrum on the other side. What is the missing distance in centimetres?
11. 11.🪝 A load of 380 N hangs from a pulley system in which 2 rope sections hold up the load. What effort is needed, in newtons? (ideal pulleys)
12. 12.🪝 A load of 480 N hangs from a pulley system in which 2 rope sections hold up the load. What effort is needed, in newtons? (ideal pulleys)
13. 13.⚖️ A seesaw balances. Arjun (120 N) sits 1 m from the pivot on one side; Asha (? N) sits 1 m from the pivot on the other side. What is the missing weight in newtons?
14. 14.Which of these is a screw? (a) a jar lid (b) a nutcracker (c) a road up a hill (d) a window blind cord
15. 15.⚖️ Along a straight bar, measured from the left end, the effort is at 30 cm, the fulcrum at 60 cm and the load at 80 cm. Which class of lever is it? (a) class 2 (b) class 3 (c) class 1
16. 16.🔍 Which is the odd one out? (a) a nut and bolt (b) a wood screw (c) a screw jack (d) a claw hammer on a nail
17. 17.⚖️ A seesaw balances. Meena (640 N) sits 2 m from the pivot on one side; Asha (320 N) sits ? m from the pivot on the other side. What is the missing distance in metres?
18. 18.🏋️ Pushing a crate 3 m took 1230 J of work. What force was used, in newtons?
19. 19.💪 Which force is at work: a rolling ball slows? (a) magnetic force (b) muscular force (c) gravity (d) friction
20. 20.Which of these is a pulley? (a) a crane hook block (b) a seesaw (c) an axe blade (d) a knife edge
21. 21.🪝 Fixed or movable pulley: which one halves the effort? (a) a movable pulley (b) a fixed pulley
22. 22.🏋️ A longer ramp to the same height needs … (a) the same effort (b) less effort (c) no effort (d) more effort
23. 23.True or false: a fixed pulley only changes direction. (a) False (b) True
24. 24.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 4 N, a carpet 5 N, ice 1 N, a glass sheet 3 N. Which surface gave the most friction? (a) a wooden plank (b) a carpet (c) a glass sheet (d) ice
25. 25.⚖️ A lever bar balances. The load is 360 N at 30 cm from the fulcrum. The effort is ? N at 90 cm from the fulcrum on the other side. What is the missing force in newtons?
26. 26.⚙️ How many simple machines are there in the usual list? (a) 12 (b) 6 (c) 3 (d) 10
27. 27.🔍 Which is the odd one out? (a) a grippy rubber sole (b) chalk on a gym bar (c) a wheel on ball bearings (d) a box pushed on carpet
28. 28.🏋️ Work is done when a force moves something … (a) only upwards (b) very slowly (c) through a distance (d) without moving it
29. 29.⚖️ A seesaw balances. Arjun (200 N) sits 4 m from the pivot on one side; Ravi (? N) sits 1 m from the pivot on the other side. What is the missing weight in newtons?
30. 30.⚙️ A screw is really … (a) a tiny pulley (b) a bent lever (c) a kind of wheel (d) a ramp wrapped round
31. 31.⚖️ Which class of lever is a lemon squeezer? (a) class 3 (b) class 2 (c) class 1
32. 32.🛞 Is friction helpful or a problem here: brakes stopping a cycle? (a) a problem (b) helpful
33. 33.🏋️ In which unit is work measured? (a) metre (m) (b) joule (J) (c) watt hour (d) newton (N)
34. 34.💪 Is a tug of war a push or a pull? (a) a pull (b) a push
35. 35.🏋️ Pushing a crate 6 m took 1740 J of work. What force was used, in newtons?
36. 36.⚖️ Along a straight bar, measured from the left end, the effort is at 40 cm, the fulcrum at 30 cm and the load at 0 cm. Which class of lever is it? (a) class 3 (b) class 2 (c) class 1
37. 37.🪝 A pulley system lifts a 280 N load with an effort of 70 N. What is its mechanical advantage (MA)?
38. 38.True or false: a movable pulley makes you pull 2× rope. (a) True (b) False
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. How many newtons more were needed on sandpaper than on a glass sheet?
40. 40.🪝 Fixed or movable pulley: which one is on a flagpole top? (a) a movable pulley (b) a fixed pulley

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