Engineering Worksheet: Part 2 Test

Engineering lesson 16: Part 2 test: forces and machines · Set 219 · 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.🪝 Fixed or movable pulley: which one needs effort = load? (a) a movable pulley (b) a fixed pulley
2. 2.🪝 A winch has a wheel of radius 7 cm and an axle of radius 1 cm. What effort on the wheel lifts a 1400 N bucket on the axle, in newtons? (ideal)
3. 3.⚖️ A seesaw balances. Meena (? N) sits 2 m from the pivot on one side; Zoya (380 N) sits 4 m from the pivot on the other side. What is the missing weight in newtons?
4. 4.🏋️ Pushing a crate 3 m took 1350 J of work. What force was used, in newtons?
5. 5.True or false: powder on a carrom board gives less friction. (a) False (b) True
6. 6.⚖️ Which class of lever is a pair of scissors? (a) class 1 (b) class 3 (c) class 2
7. 7.🏋️ A machine lifts a load of 260 N when you push with 130 N. What is its mechanical advantage (MA)?
8. 8.Which of these is caused by gravity? (a) shoes grip the floor (b) pedalling a cycle (c) rain falls to the ground (d) a rolling ball slows
9. 9.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 10 N, ice 1 N, a wooden plank 5 N, a carpet 6 N. How many newtons more were needed on sandpaper than on ice?
10. 10.🪝 A pulley system has 3 rope sections holding up the load. To lift the load by 9 m, how many metres of rope must you pull?
11. 11.True or false: a bottle opener is a class 1 lever (fulcrum in the middle). (a) False (b) True
12. 12.🛞 How can we reduce friction in a machine? (a) make parts rough (b) press parts harder (c) oil the moving parts (d) add sand
13. 13.⚖️ A lever bar balances. The load is 180 N at ? cm from the fulcrum. The effort is 180 N at 20 cm from the fulcrum on the other side. What is the missing distance in centimetres?
14. 14.⚖️ A seesaw balances. Zoya (? N) sits 2 m from the pivot on one side; Asha (340 N) sits 1 m from the pivot on the other side. What is the missing weight in newtons?
15. 15.🪝 A pulley system lifts a 300 N load with an effort of 100 N. What is its mechanical advantage (MA)?
16. 16.🏋️ A smooth ramp is 10 m long and rises 2 m. What effort pushes a 1000 N box up it, in newtons? (ideal ramp, no friction)
17. 17.⚖️ A seesaw balances. Meena (570 N) sits 1 m from the pivot on one side; Kabir (190 N) sits ? m from the pivot on the other side. What is the missing distance in metres?
18. 18.True or false: kicking a football is a push. (a) False (b) True
19. 19.Which of these is a lever? (a) a well winch handle (b) a bottle cap (c) the tip of a nail (d) a seesaw
20. 20.🏋️ Work is done when a force moves something … (a) very slowly (b) through a distance (c) only upwards (d) without moving it
21. 21.🔍 Which is the odd one out? (a) a box pushed on carpet (b) a wheel on ball bearings (c) a rough doormat (d) a grippy rubber sole
22. 22.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 7 N, sandpaper 11 N, a glass sheet 2 N, a wooden plank 5 N. Which surface gave the most friction? (a) a wooden plank (b) a carpet (c) sandpaper (d) a glass sheet
23. 23.⚖️ A seesaw balances. Ravi (170 N) sits ? m from the pivot on one side; Kabir (680 N) sits 1 m from the pivot on the other side. What is the missing distance in metres?
24. 24.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 6 N, sandpaper 10 N, ice 1 N, a glass sheet 3 N. How many newtons more were needed on sandpaper than on ice?
25. 25.💪 Which force is at work: a thrown ball comes down? (a) muscular force (b) friction (c) magnetic force (d) gravity
26. 26.🏋️ A longer ramp to the same height needs … (a) less effort (b) no effort (c) more effort (d) the same effort
27. 27.True or false: pulling up your socks is a pull. (a) False (b) True
28. 28.⚖️ A seesaw balances. Ravi (360 N) sits 1 m from the pivot on one side; Zoya (120 N) sits ? m from the pivot on the other side. What is the missing distance in metres?
29. 29.⚖️ A seesaw balances. Ravi (100 N) sits 4 m from the pivot on one side; Kabir (? N) sits 1 m from the pivot on the other side. What is the missing weight in newtons?
30. 30.Which of these is caused by muscular force? (a) a magnet picks up pins (b) a thrown ball comes down (c) pedalling a cycle (d) a compass needle turns
31. 31.⚖️ On a seesaw, a heavier child should sit … (a) on the pivot (b) anywhere (c) farther from the pivot (d) closer to the pivot
32. 32.⚖️ Along a straight bar, measured from the left end, the effort is at 0 cm, the fulcrum at 50 cm and the load at 10 cm. Which class of lever is it? (a) class 1 (b) class 2 (c) class 3
33. 33.⚖️ Turning effect = force × … (a) mass of fulcrum (b) distance from fulcrum (c) time taken (d) colour of bar
34. 34.🛞 More or less friction: oil on a squeaky hinge? (a) less friction (b) more friction
35. 35.⚖️ In a class 3 lever, what is in the middle? (a) the load (b) the fulcrum (c) the effort (d) the pulley
36. 36.🛞 Is friction helpful or a problem here: gripping a cricket bat? (a) helpful (b) a problem
37. 37.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 8 N, a glass sheet 2 N, a wooden plank 3 N, a carpet 7 N. How many newtons more were needed on sandpaper than on a glass sheet?
38. 38.🛞 Rubbing your hands fast makes them … (a) warm (b) wet (c) magnetic (d) cold
39. 39.⚙️ A wedge is … (a) two ramps back to back (b) a bar on a pivot (c) a wheel on a rod (d) a rope on a wheel
40. 40.🏋️ Mechanical advantage (MA) = … (a) load + effort (b) load × effort (c) load ÷ effort (d) effort ÷ load

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