Engineering Worksheet: Part 2 Test

Engineering lesson 16: Part 2 test: forces and machines · Set 288 · 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.⚖️ Along a straight bar, measured from the left end, the effort is at 10 cm, the fulcrum at 60 cm and the load at 40 cm. Which class of lever is it? (a) class 1 (b) class 2 (c) class 3
2. 2.True or false: a nutcracker is a class 1 lever (fulcrum in the middle). (a) True (b) False
3. 3.True or false: a fixed pulley makes you pull 2× rope. (a) False (b) True
4. 4.⚖️ A lever bar balances. The load is 180 N at ? cm from the fulcrum. The effort is 360 N at 20 cm from the fulcrum on the other side. What is the missing distance in centimetres?
5. 5.⚖️ Which class of lever is a beam balance? (a) class 3 (b) class 2 (c) class 1
6. 6.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 4 N, a wooden plank 5 N, a carpet 7 N, sandpaper 10 N. Which surface gave the least friction? (a) a wooden plank (b) sandpaper (c) a carpet (d) a glass sheet
7. 7.🔍 Which is the odd one out? (a) a water tap handle (b) a round doorknob (c) a nutcracker (d) a well winch handle
8. 8.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 4 N, sandpaper 8 N, ice 1 N, a glass sheet 2 N. Which surface gave the most friction? (a) a carpet (b) sandpaper (c) ice (d) a glass sheet
9. 9.⚖️ A seesaw balances. Meena (300 N) sits 2 m from the pivot on one side; Ravi (300 N) sits ? m from the pivot on the other side. What is the missing distance in metres?
10. 10.True or false: opening a drawer is a push. (a) False (b) True
11. 11.⚖️ In a class 1 lever, what is in the middle? (a) nothing (b) the effort (c) the load (d) the fulcrum
12. 12.⚖️ Which class of lever is your forearm? (a) class 2 (b) class 3 (c) class 1
13. 13.⚖️ A seesaw balances. Arjun (? N) sits 2 m from the pivot on one side; Kabir (340 N) sits 4 m from the pivot on the other side. What is the missing weight in newtons?
14. 14.💪 Two children push a box to the right, one with 75 N and the other with 90 N. What is the net (total) force on the box, in newtons?
15. 15.True or false: a fixed pulley rises with the load. (a) True (b) False
16. 16.⚖️ In a class 2 lever, what is in the middle? (a) the fulcrum (b) the axle (c) the effort (d) the load
17. 17.🪝 A winch has a wheel of radius 3 cm and an axle of radius 1 cm. What effort on the wheel lifts a 270 N bucket on the axle, in newtons? (ideal)
18. 18.🪝 Fixed or movable pulley: which one rises with the load? (a) a movable pulley (b) a fixed pulley
19. 19.🏋️ Mechanical advantage (MA) = … (a) load + effort (b) load × effort (c) effort ÷ load (d) load ÷ effort
20. 20.🛞 Why are tyres made with deep treads? (a) to save rubber (b) to look nice (c) to grip the road (d) to go slower
21. 21.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 11 N, ice 2 N, a glass sheet 6 N, a wooden plank 7 N. How many newtons more were needed on sandpaper than on ice?
22. 22.⚖️ Turning effect = force × … (a) distance from fulcrum (b) mass of fulcrum (c) colour of bar (d) time taken
23. 23.Which of these is caused by muscular force? (a) lifting a school bag (b) brakes stop a bicycle (c) a magnet picks up pins (d) shoes grip the floor
24. 24.🔍 Which is the odd one out? (a) a smooth steel slide (b) a grippy rubber sole (c) sand on a slippery path (d) chalk on a gym bar
25. 25.💪 Which force pulls everything towards the Earth? (a) magnetism (b) wind (c) friction (d) gravity
26. 26.⚖️ A seesaw balances. Arjun (? N) sits 1 m from the pivot on one side; Meena (160 N) sits 4 m from the pivot on the other side. What is the missing weight in newtons?
27. 27.⚖️ A seesaw balances. Asha (480 N) sits 1 m from the pivot on one side; Zoya (? N) sits 3 m from the pivot on the other side. What is the missing weight in newtons?
28. 28.🏋️ A machine lifts a load of 540 N when you push with 90 N. What is its mechanical advantage (MA)?
29. 29.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 3 N, a carpet 7 N, sandpaper 11 N, ice 1 N. How many newtons more were needed on sandpaper than on ice?
30. 30.⚖️ What is the pivot point of a lever called? (a) the effort (b) the fulcrum (c) the load (d) the axle
31. 31.Which of these is caused by muscular force? (a) rain falls to the ground (b) a river flows downhill (c) pedalling a cycle (d) rubbing hands warms them
32. 32.⚙️ Which simple machine is a crane hook block? (a) wedge (b) wheel and axle (c) lever (d) pulley
33. 33.True or false: pushing a trolley is a pull. (a) True (b) False
34. 34.⚖️ On a seesaw, a heavier child should sit … (a) farther from the pivot (b) anywhere (c) on the pivot (d) closer to the pivot
35. 35.⚙️ How many simple machines are there in the usual list? (a) 12 (b) 6 (c) 10 (d) 3
36. 36.True or false: a fixed pulley stays in one place. (a) False (b) True
37. 37.🪝 A load of 450 N hangs from a pulley system in which 3 rope sections hold up the load. What effort is needed, in newtons? (ideal pulleys)
38. 38.True or false: a fixed pulley hangs on the rope loop. (a) False (b) True
39. 39.🏋️ A force of 120 N did 600 J of work. How many metres did the object move?
40. 40.🛞 Is friction helpful or a problem here: dragging a heavy box? (a) helpful (b) a problem

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