Engineering Worksheet: Part 2 Test

Engineering lesson 16: Part 2 test: forces and machines · Set 823 · 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.💪 Two children push a box to the right, one with 60 N and the other with 80 N. What is the net (total) force on the box, in newtons?
2. 2.🔍 Which is the odd one out? (a) a claw hammer on a nail (b) a crowbar (c) a jar lid (d) a nutcracker
3. 3.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 9 N, ice 1 N, a glass sheet 2 N, a carpet 5 N. Which surface gave the most friction? (a) a glass sheet (b) a carpet (c) ice (d) sandpaper
4. 4.🛞 How can we reduce friction in a machine? (a) press parts harder (b) oil the moving parts (c) add sand (d) make parts rough
5. 5.⚖️ Going along a lever from one end to the other, the order is: effort, fulcrum, load. Which class of lever is it? (a) class 1 (b) class 3 (c) class 2
6. 6.🏋️ A force of 500 N did 1000 J of work. How many metres did the object move?
7. 7.⚖️ A lever balances when … (a) the bar is short (b) turning effects match (c) both weights are equal (d) the fulcrum moves
8. 8.⚖️ Which class of lever is a pair of scissors? (a) class 3 (b) class 1 (c) class 2
9. 9.True or false: a screw jack is a screw. (a) False (b) True
10. 10.🏋️ Mechanical advantage (MA) = … (a) load + effort (b) effort ÷ load (c) load × effort (d) load ÷ effort
11. 11.⚖️ Which class of lever is a seesaw? (a) class 1 (b) class 3 (c) class 2
12. 12.True or false: a movable pulley is on a flagpole top. (a) False (b) True
13. 13.⚖️ A lever bar balances. The load is 150 N at 50 cm from the fulcrum. The effort is 250 N at ? cm from the fulcrum on the other side. What is the missing distance in centimetres?
14. 14.🔍 Which is the odd one out? (a) a rough doormat (b) a grippy rubber sole (c) chalk on a gym bar (d) powder on a carrom board
15. 15.⚖️ A seesaw balances. Asha (390 N) sits 1 m from the pivot on one side; Kabir (130 N) sits ? m from the pivot on the other side. What is the missing distance in metres?
16. 16.⚖️ A seesaw balances. Kabir (480 N) sits 3 m from the pivot on one side; Asha (? N) sits 3 m from the pivot on the other side. What is the missing weight in newtons?
17. 17.True or false: a jar lid is a screw. (a) True (b) False
18. 18.⚖️ A seesaw balances. Asha (300 N) sits 1 m from the pivot on one side; Kabir (? N) sits 3 m from the pivot on the other side. What is the missing weight in newtons?
19. 19.⚖️ Along a straight bar, measured from the left end, the effort is at 20 cm, the fulcrum at 10 cm and the load at 0 cm. Which class of lever is it? (a) class 2 (b) class 3 (c) class 1
20. 20.🛞 Is friction helpful or a problem here: writing with a pencil? (a) a problem (b) helpful
21. 21.⚖️ Going along a lever from one end to the other, the order is: fulcrum, effort, load. Which class of lever is it? (a) class 2 (b) class 1 (c) class 3
22. 22.🏋️ In which unit is work measured? (a) newton (N) (b) metre (m) (c) joule (J) (d) watt hour
23. 23.🏋️ A smooth ramp is 6 m long and rises 1 m. What effort pushes a 3300 N box up it, in newtons? (ideal ramp, no friction)
24. 24.True or false: a wet tiled floor gives less friction. (a) True (b) False
25. 25.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 6 N, sandpaper 9 N, ice 1 N, a glass sheet 5 N. Which surface gave the most friction? (a) a wooden plank (b) ice (c) a glass sheet (d) sandpaper
26. 26.⚖️ A seesaw balances. Arjun (300 N) sits ? m from the pivot on one side; Kabir (450 N) sits 2 m from the pivot on the other side. What is the missing distance in metres?
27. 27.💪 Two children push a box to the right, one with 70 N and the other with 60 N. What is the net (total) force on the box, in newtons?
28. 28.Which of these is caused by magnetic force? (a) rain falls to the ground (b) a magnet picks up pins (c) lifting a school bag (d) shoes grip the floor
29. 29.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 8 N, sandpaper 9 N, ice 2 N, a wooden plank 4 N. Which surface gave the least friction? (a) ice (b) sandpaper (c) a wooden plank (d) a carpet
30. 30.🏋️ A smooth ramp is 4 m long and rises 2 m. What effort pushes a 700 N box up it, in newtons? (ideal ramp, no friction)
31. 31.💪 Is closing a drawer a push or a pull? (a) a pull (b) a push
32. 32.⚖️ Along a straight bar, measured from the left end, the effort is at 30 cm, the fulcrum at 60 cm and the load at 40 cm. Which class of lever is it? (a) class 3 (b) class 1 (c) class 2
33. 33.🪝 A load of 160 N hangs from a pulley system in which 2 rope sections hold up the load. What effort is needed, in newtons? (ideal pulleys)
34. 34.Which of these is caused by gravity? (a) rubbing hands warms them (b) rain falls to the ground (c) a rolling ball slows (d) shoes grip the floor
35. 35.⚖️ Which class of lever is a crowbar? (a) class 2 (b) class 3 (c) class 1
36. 36.Which of these is a pulley? (a) a nutcracker (b) a bottle cap (c) a nut and bolt (d) a flagpole rope wheel
37. 37.Which of these is caused by muscular force? (a) a thrown ball comes down (b) lifting a school bag (c) a compass needle turns (d) an apple falls down
38. 38.💪 A force is a … (a) kind of colour (b) push or a pull (c) unit of time (d) type of sound
39. 39.🛞 Rubbing your hands fast makes them … (a) wet (b) magnetic (c) cold (d) warm
40. 40.🏋️ A force of 30 N did 90 J of work. How many metres did the object move?

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