Engineering Worksheet: Part 2 Test

Engineering lesson 16: Part 2 test: forces and machines · Set 224 · 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.True or false: a tyre with deep treads gives more friction. (a) False (b) True
2. 2.True or false: a broom when sweeping is a class 3 lever (effort in the middle). (a) True (b) False
3. 3.🪝 Fixed or movable pulley: which one halves the effort? (a) a fixed pulley (b) a movable pulley
4. 4.Which of these is caused by muscular force? (a) brakes stop a bicycle (b) a magnet picks up pins (c) a thrown ball comes down (d) squeezing a lemon
5. 5.🪝 A pulley system has 3 rope sections holding up the load. To lift the load by 7 m, how many metres of rope must you pull?
6. 6.True or false: opening a drawer is a pull. (a) True (b) False
7. 7.🛞 More or less friction: a wet tiled floor? (a) more friction (b) less friction
8. 8.🏋️ A smooth ramp is 6 m long and rises 1 m. What effort pushes a 900 N box up it, in newtons? (ideal ramp, no friction)
9. 9.⚖️ A seesaw balances. Ravi (420 N) sits 1 m from the pivot on one side; Arjun (? N) sits 3 m from the pivot on the other side. What is the missing weight in newtons?
10. 10.🏋️ Work is done when a force moves something … (a) very slowly (b) without moving it (c) through a distance (d) only upwards
11. 11.⚖️ A seesaw balances. Asha (? N) sits 2 m from the pivot on one side; Zoya (240 N) sits 3 m from the pivot on the other side. What is the missing weight in newtons?
12. 12.True or false: pulling a cart is a push. (a) False (b) True
13. 13.🏋️ A smooth ramp is 12 m long and rises 2 m. What effort pushes a 4800 N box up it, in newtons? (ideal ramp, no friction)
14. 14.💪 In a tug of war, one team pulls right with 15 N and the other pulls left with 10 N. What is the size of the net force, in newtons?
15. 15.🏋️ Pushing a crate 1 m took 360 J of work. What force was used, in newtons?
16. 16.🪝 What does a single fixed pulley change? (a) the size of the load (b) gravity (c) the colour of rope (d) the direction of pull
17. 17.⚙️ How many simple machines are there in the usual list? (a) 6 (b) 10 (c) 12 (d) 3
18. 18.🛞 Is friction helpful or a problem here: gripping a cricket bat? (a) a problem (b) helpful
19. 19.⚖️ A seesaw balances. Zoya (? N) sits 2 m from the pivot on one side; Asha (320 N) sits 3 m from the pivot on the other side. What is the missing weight in newtons?
20. 20.🪝 A winch has a wheel of radius 24 cm and an axle of radius 3 cm. What effort on the wheel lifts a 1440 N bucket on the axle, in newtons? (ideal)
21. 21.⚖️ Turning effect = force × … (a) mass of fulcrum (b) time taken (c) colour of bar (d) distance from fulcrum
22. 22.⚙️ Which simple machine is a crane hook block? (a) lever (b) wedge (c) screw (d) pulley
23. 23.💪 Two children push a box to the right, one with 30 N and the other with 30 N. What is the net (total) force on the box, in newtons?
24. 24.🪝 A pulley system lifts a 240 N load with an effort of 80 N. What is its mechanical advantage (MA)?
25. 25.⚖️ A lever bar balances. The load is 360 N at ? cm from the fulcrum. The effort is 40 N at 90 cm from the fulcrum on the other side. What is the missing distance in centimetres?
26. 26.True or false: a well-bucket rope wheel is a wheel and axle. (a) False (b) True
27. 27.True or false: a fixed pulley only changes direction. (a) True (b) False
28. 28.🔍 Which is the odd one out? (a) a crane hook block (b) a bottle cap (c) a flagpole rope wheel (d) a window blind cord
29. 29.⚖️ Which class of lever is a beam balance? (a) class 2 (b) class 1 (c) class 3
30. 30.⚙️ Most simple machines make work easier by letting us … (a) use a smaller force (b) switch off gravity (c) make new energy (d) stop all friction
31. 31.⚖️ A lever bar balances. The load is 600 N at 30 cm from the fulcrum. The effort is 180 N at ? cm from the fulcrum on the other side. What is the missing distance in centimetres?
32. 32.⚖️ Which class of lever is a broom when sweeping? (a) class 3 (b) class 2 (c) class 1
33. 33.🛞 More or less friction: a tyre with deep treads? (a) less friction (b) more friction
34. 34.⚙️ Which simple machine is a screw jack? (a) wheel and axle (b) wedge (c) screw (d) inclined plane
35. 35.🏋️ A longer ramp to the same height needs … (a) more effort (b) the same effort (c) less effort (d) no effort
36. 36.🪝 Fixed or movable pulley: which one rises with the load? (a) a movable pulley (b) a fixed pulley
37. 37.⚖️ A lever bar balances. The load is 450 N at ? cm from the fulcrum. The effort is 450 N at 50 cm from the fulcrum on the other side. What is the missing distance in centimetres?
38. 38.⚖️ Which class of lever is a pair of kitchen tongs? (a) class 3 (b) class 2 (c) class 1
39. 39.🪝 A pulley system lifts a 640 N load with an effort of 160 N. What is its mechanical advantage (MA)?
40. 40.🛞 How can we reduce friction in a machine? (a) press parts harder (b) make parts rough (c) oil the moving parts (d) add sand

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