Engineering Worksheet: Part 2 Test

Engineering lesson 16: Part 2 test: forces and machines · Set 558 · 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 load of 320 N hangs from a pulley system in which 4 rope sections hold up the load. What effort is needed, in newtons? (ideal pulleys)
2. 2.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 3 N, a carpet 6 N, sandpaper 9 N, ice 2 N. How many newtons more were needed on sandpaper than on ice?
3. 3.🪝 A pulley system has 1 rope section holding up the load. To lift the load by 8 m, how many metres of rope must you pull?
4. 4.True or false: a chisel is a wedge. (a) True (b) False
5. 5.🏋️ Pushing a crate 9 m took 2610 J of work. What force was used, in newtons?
6. 6.🏋️ A force of 420 N did 420 J of work. How many metres did the object move?
7. 7.💪 Is plucking a mango a push or a pull? (a) a push (b) a pull
8. 8.⚙️ Which simple machine is a crowbar? (a) inclined plane (b) wheel and axle (c) pulley (d) lever
9. 9.🪝 A wheel and axle is a big wheel fixed to … (a) a flat ramp (b) a loose rope (c) a sharp wedge (d) a smaller rod (axle)
10. 10.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 4 N, a glass sheet 8 N, a wooden plank 11 N, a carpet 13 N. How many newtons more were needed on a carpet than on ice?
11. 11.⚖️ On a seesaw, a heavier child should sit … (a) farther from the pivot (b) anywhere (c) closer to the pivot (d) on the pivot
12. 12.True or false: a movable pulley stays in one place. (a) False (b) True
13. 13.⚙️ Which simple machine is a truck loading ramp? (a) wedge (b) wheel and axle (c) screw (d) inclined plane
14. 14.💪 Is pulling up your socks a push or a pull? (a) a pull (b) a push
15. 15.🏋️ A machine lifts a load of 320 N when you push with 160 N. What is its mechanical advantage (MA)?
16. 16.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 9 N, sandpaper 13 N, a glass sheet 3 N, a wooden plank 7 N. Which surface gave the most friction? (a) a glass sheet (b) a wooden plank (c) a carpet (d) sandpaper
17. 17.⚖️ A seesaw balances. Arjun (300 N) sits 3 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?
18. 18.🏋️ Mechanical advantage (MA) = … (a) load ÷ effort (b) load + effort (c) effort ÷ load (d) load × effort
19. 19.⚖️ Turning effect = force × … (a) colour of bar (b) mass of fulcrum (c) time taken (d) distance from fulcrum
20. 20.⚙️ Most simple machines make work easier by letting us … (a) stop all friction (b) use a smaller force (c) make new energy (d) switch off gravity
21. 21.🏋️ Can a simple machine reduce the work done? (a) only on Mondays (b) no, work stays the same (c) yes, always (d) yes, by half
22. 22.🔍 Which is the odd one out? (a) a grippy rubber sole (b) sand on a slippery path (c) oil on a squeaky hinge (d) a box pushed on carpet
23. 23.⚖️ A lever bar balances. The load is ? N at 50 cm from the fulcrum. The effort is 400 N at 60 cm from the fulcrum on the other side. What is the missing force in newtons?
24. 24.🪝 A well winch has a handle (wheel) of radius 4 cm turning an axle of radius 2 cm. What is its mechanical advantage (MA)?
25. 25.🏋️ A force of 150 N did 900 J of work. How many metres did the object move?
26. 26.⚖️ Which class of lever is a pair of tweezers? (a) class 2 (b) class 1 (c) class 3
27. 27.💪 Is closing a drawer a push or a pull? (a) a pull (b) a push
28. 28.⚖️ Which class of lever is a pair of pliers? (a) class 1 (b) class 3 (c) class 2
29. 29.💪 Is pushing a swing a push or a pull? (a) a push (b) a pull
30. 30.💪 Which can a force NOT do? (a) change its colour (b) stop it moving (c) start it moving (d) change its shape
31. 31.True or false: a smooth steel slide gives more friction. (a) True (b) False
32. 32.🪝 A load of 690 N hangs from a pulley system in which 3 rope sections hold up the load. What effort is needed, in newtons? (ideal pulleys)
33. 33.💪 Is pushing a trolley a push or a pull? (a) a pull (b) a push
34. 34.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 9 N, ice 2 N, a glass sheet 5 N, a wooden plank 6 N. How many newtons more were needed on a carpet than on ice?
35. 35.🪝 More rope sections holding a load means … (a) the load floats (b) more effort needed (c) no change (d) less effort needed
36. 36.🪝 Fixed or movable pulley: which one makes you pull 2× rope? (a) a fixed pulley (b) a movable pulley
37. 37.Which of these is caused by magnetic force? (a) a magnet picks up pins (b) a rolling ball slows (c) pedalling a cycle (d) a thrown ball comes down
38. 38.🏋️ A force of 210 N did 1680 J of work. How many metres did the object move?
39. 39.⚖️ A seesaw balances. Kabir (150 N) sits ? m from the pivot on one side; Meena (150 N) sits 1 m from the pivot on the other side. What is the missing distance in metres?
40. 40.🏋️ A machine lifts a load of 360 N when you push with 120 N. What is its mechanical advantage (MA)?

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