Engineering Worksheet: Part 2 Test

Engineering lesson 16: Part 2 test: forces and machines · Set 994 · 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.🛞 Is friction helpful or a problem here: shoe soles wearing out? (a) a problem (b) helpful
2. 2.True or false: a crowbar is a class 1 lever (fulcrum in the middle). (a) False (b) True
3. 3.💪 Two children push a box to the right, one with 20 N and the other with 25 N. What is the net (total) force on the box, in newtons?
4. 4.🔍 Which is the odd one out? (a) a tyre with deep treads (b) sand on a slippery path (c) a grippy rubber sole (d) a wet tiled floor
5. 5.⚖️ On a seesaw, a heavier child should sit … (a) closer to the pivot (b) on the pivot (c) anywhere (d) farther from the pivot
6. 6.⚖️ Turning effect = force × … (a) colour of bar (b) mass of fulcrum (c) distance from fulcrum (d) time taken
7. 7.⚙️ Which simple machine is a chisel? (a) lever (b) wheel and axle (c) inclined plane (d) wedge
8. 8.Which of these is a lever? (a) a steering wheel (b) a well-bucket rope wheel (c) a road up a hill (d) a bottle opener
9. 9.⚙️ Which simple machine is a nutcracker? (a) wheel and axle (b) pulley (c) wedge (d) lever
10. 10.🔍 Which is the odd one out? (a) a box pushed on carpet (b) oil on a squeaky hinge (c) a grippy rubber sole (d) a rough doormat
11. 11.True or false: a pair of pliers is a class 1 lever (fulcrum in the middle). (a) True (b) False
12. 12.⚖️ A seesaw balances. Asha (680 N) sits 4 m from the pivot on one side; Kabir (? N) sits 4 m from the pivot on the other side. What is the missing weight in newtons?
13. 13.⚖️ Along a straight bar, measured from the left end, the effort is at 60 cm, the fulcrum at 20 cm and the load at 30 cm. Which class of lever is it? (a) class 2 (b) class 1 (c) class 3
14. 14.⚖️ Along a straight bar, measured from the left end, the effort is at 30 cm, the fulcrum at 0 cm and the load at 10 cm. Which class of lever is it? (a) class 2 (b) class 3 (c) class 1
15. 15.⚖️ A seesaw balances. Asha (? N) sits 1 m from the pivot on one side; Ravi (160 N) sits 2 m from the pivot on the other side. What is the missing weight in newtons?
16. 16.⚙️ Which simple machine is a steering wheel? (a) pulley (b) inclined plane (c) wedge (d) wheel and axle
17. 17.⚖️ Along a straight bar, measured from the left end, the effort is at 40 cm, the fulcrum at 50 cm and the load at 20 cm. Which class of lever is it? (a) class 1 (b) class 2 (c) class 3
18. 18.⚖️ A seesaw balances. Meena (480 N) sits 4 m from the pivot on one side; Zoya (480 N) sits ? m from the pivot on the other side. What is the missing distance in metres?
19. 19.Which of these is caused by gravity? (a) an apple falls down (b) lifting a school bag (c) pedalling a cycle (d) brakes stop a bicycle
20. 20.⚙️ Which simple machine is a bottle opener? (a) lever (b) inclined plane (c) pulley (d) wedge
21. 21.🔍 Which is the odd one out? (a) a crane hook block (b) a well-bucket rope wheel (c) a wheelchair ramp (d) a window blind cord
22. 22.🛞 More or less friction: chalk on a gym bar? (a) more friction (b) less friction
23. 23.💪 A bag has a mass of 23 kg. Taking 1 kg to weigh about 10 N, what is its weight in newtons?
24. 24.True or false: a playground slide is a lever. (a) False (b) True
25. 25.⚖️ A seesaw balances. Meena (? N) sits 3 m from the pivot on one side; Ravi (360 N) sits 1 m from the pivot on the other side. What is the missing weight in newtons?
26. 26.🛞 Friction acts … (a) only on ice (b) only upwards (c) against the motion (d) with the motion
27. 27.⚖️ Which class of lever is a seesaw? (a) class 1 (b) class 3 (c) class 2
28. 28.🪝 Fixed or movable pulley: which one stays in one place? (a) a movable pulley (b) a fixed pulley
29. 29.🏋️ A longer ramp to the same height needs … (a) more effort (b) the same effort (c) no effort (d) less effort
30. 30.💪 Is pressing a doorbell a push or a pull? (a) a pull (b) a push
31. 31.🏋️ Can a simple machine reduce the work done? (a) yes, always (b) no, work stays the same (c) only on Mondays (d) yes, by half
32. 32.True or false: a fixed pulley hangs on the rope loop. (a) False (b) True
33. 33.🔍 Which is the odd one out? (a) a wet tiled floor (b) chalk on a gym bar (c) a wheel on ball bearings (d) a smooth steel slide
34. 34.🪝 Fixed or movable pulley: which one only changes direction? (a) a fixed pulley (b) a movable pulley
35. 35.⚖️ A lever bar balances. The load is ? N at 10 cm from the fulcrum. The effort is 70 N at 100 cm from the fulcrum on the other side. What is the missing force in newtons?
36. 36.🪝 Fixed or movable pulley: which one rises with the load? (a) a fixed pulley (b) a movable pulley
37. 37.⚖️ A lever balances when … (a) the fulcrum moves (b) turning effects match (c) both weights are equal (d) the bar is short
38. 38.🏋️ A machine lifts a load of 50 N when you push with 10 N. What is its mechanical advantage (MA)?
39. 39.⚖️ A lever bar balances. The load is ? N at 10 cm from the fulcrum. The effort is 20 N at 30 cm from the fulcrum on the other side. What is the missing force in newtons?
40. 40.True or false: a box pushed on carpet gives more friction. (a) False (b) True

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