Engineering Worksheet: Part 2 Test

Engineering lesson 16: Part 2 test: forces and machines · Set 857 · 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.🪝 A bucket weighing 120 N is lifted with a single fixed pulley at the top of a well. What effort is needed, in newtons? (ideal pulley, no friction)
2. 2.⚖️ A lever bar balances. The load is ? N at 50 cm from the fulcrum. The effort is 200 N at 70 cm from the fulcrum on the other side. What is the missing force in newtons?
3. 3.🪝 More rope sections holding a load means … (a) the load floats (b) more effort needed (c) less effort needed (d) no change
4. 4.Which of these is an inclined plane? (a) a wheelchair ramp (b) a bottle cap (c) a water tap handle (d) a nutcracker
5. 5.🛞 Is friction helpful or a problem here: writing with a pencil? (a) helpful (b) a problem
6. 6.⚖️ On a seesaw, a heavier child should sit … (a) on the pivot (b) anywhere (c) closer to the pivot (d) farther from the pivot
7. 7.True or false: a well-bucket rope wheel is a wedge. (a) True (b) False
8. 8.True or false: a knife edge is a wedge. (a) True (b) False
9. 9.🛞 Is friction helpful or a problem here: brakes stopping a cycle? (a) helpful (b) a problem
10. 10.Which of these is a screw? (a) a crowbar (b) a chisel (c) a round doorknob (d) a wood screw
11. 11.🏋️ A longer ramp to the same height needs … (a) no effort (b) the same effort (c) less effort (d) more effort
12. 12.True or false: a fixed pulley stays in one place. (a) False (b) True
13. 13.Which of these is a wedge? (a) a nut and bolt (b) a crowbar (c) a crane hook block (d) a door stopper
14. 14.⚖️ A seesaw balances. Meena (220 N) sits ? m from the pivot on one side; Asha (440 N) sits 2 m from the pivot on the other side. What is the missing distance in metres?
15. 15.🪝 A bucket weighing 20 N is lifted with a single fixed pulley at the top of a well. What effort is needed, in newtons? (ideal pulley, no friction)
16. 16.⚖️ Along a straight bar, measured from the left end, the effort is at 10 cm, the fulcrum at 80 cm and the load at 50 cm. Which class of lever is it? (a) class 3 (b) class 1 (c) class 2
17. 17.💪 A force is a … (a) kind of colour (b) unit of time (c) type of sound (d) push or a pull
18. 18.⚙️ Which simple machine is a window blind cord? (a) lever (b) inclined plane (c) wheel and axle (d) pulley
19. 19.Which of these is caused by muscular force? (a) brakes stop a bicycle (b) squeezing a lemon (c) an apple falls down (d) rain falls to the ground
20. 20.🛞 Is friction helpful or a problem here: gripping a cricket bat? (a) a problem (b) helpful
21. 21.⚖️ A lever balances when … (a) the fulcrum moves (b) turning effects match (c) both weights are equal (d) the bar is short
22. 22.💪 Two children push a box to the right, one with 70 N and the other with 50 N. What is the net (total) force on the box, in newtons?
23. 23.🛞 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 4 N, a carpet 6 N. Which surface gave the most friction? (a) ice (b) a carpet (c) a wooden plank (d) sandpaper
24. 24.⚖️ Turning effect = force × … (a) time taken (b) distance from fulcrum (c) colour of bar (d) mass of fulcrum
25. 25.🏋️ A smooth ramp is 4 m long and rises 1 m. What effort pushes a 3000 N box up it, in newtons? (ideal ramp, no friction)
26. 26.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 11 N, ice 4 N, a glass sheet 6 N, a wooden plank 8 N. How many newtons more were needed on sandpaper than on ice?
27. 27.⚖️ A lever bar balances. The load is 360 N at 50 cm from the fulcrum. The effort is 200 N at ? cm from the fulcrum on the other side. What is the missing distance in centimetres?
28. 28.⚖️ A seesaw balances. Asha (110 N) sits 2 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?
29. 29.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 4 N, a glass sheet 6 N, a carpet 10 N, sandpaper 11 N. How many newtons more were needed on sandpaper than on ice?
30. 30.⚖️ A seesaw balances. Asha (? N) sits 2 m from the pivot on one side; Zoya (360 N) sits 1 m from the pivot on the other side. What is the missing weight in newtons?
31. 31.True or false: a box pushed on carpet gives less friction. (a) True (b) False
32. 32.⚖️ A seesaw balances. Arjun (440 N) sits 1 m from the pivot on one side; Ravi (110 N) sits ? m from the pivot on the other side. What is the missing distance in metres?
33. 33.🪝 A pulley system lifts a 90 N load with an effort of 30 N. What is its mechanical advantage (MA)?
34. 34.⚖️ In a class 1 lever, what is in the middle? (a) the effort (b) nothing (c) the load (d) the fulcrum
35. 35.⚙️ Which simple machine is a well-bucket rope wheel? (a) screw (b) wedge (c) pulley (d) wheel and axle
36. 36.💪 Which force pulls everything towards the Earth? (a) wind (b) friction (c) gravity (d) magnetism
37. 37.True or false: a well winch handle is a wheel and axle. (a) True (b) False
38. 38.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 10 N, ice 1 N, a glass sheet 2 N, a wooden plank 6 N. How many newtons more were needed on sandpaper than on ice?
39. 39.🛞 Rubbing your hands fast makes them … (a) wet (b) magnetic (c) warm (d) cold
40. 40.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 10 N, a glass sheet 3 N, a wooden plank 5 N, a carpet 7 N. Which surface gave the least friction? (a) a carpet (b) a wooden plank (c) sandpaper (d) a glass sheet

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