Engineering Worksheet: Part 2 Test

Engineering lesson 16: Part 2 test: forces and machines · Set 395 · 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.💪 Which force is at work: a river flows downhill? (a) muscular force (b) friction (c) magnetic force (d) gravity
2. 2.Which of these is caused by friction? (a) an apple falls down (b) a river flows downhill (c) shoes grip the floor (d) squeezing a lemon
3. 3.🔍 Which is the odd one out? (a) a rough doormat (b) a wet tiled floor (c) a grippy rubber sole (d) a tyre with deep treads
4. 4.⚖️ Which class of lever is your forearm? (a) class 1 (b) class 2 (c) class 3
5. 5.⚖️ A lever bar balances. The load is 900 N at 30 cm from the fulcrum. The effort is ? N at 100 cm from the fulcrum on the other side. What is the missing force in newtons?
6. 6.True or false: a wet tiled floor gives less friction. (a) True (b) False
7. 7.⚖️ Going along a lever from one end to the other, the order is: load, effort, fulcrum. Which class of lever is it? (a) class 1 (b) class 2 (c) class 3
8. 8.True or false: a screw jack is a wedge. (a) False (b) True
9. 9.🪝 A pulley system lifts a 1080 N load with an effort of 270 N. What is its mechanical advantage (MA)?
10. 10.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 5 N, a carpet 9 N, sandpaper 10 N, ice 1 N. Which surface gave the most friction? (a) ice (b) a carpet (c) sandpaper (d) a wooden plank
11. 11.⚖️ A lever bar balances. The load is ? N at 10 cm from the fulcrum. The effort is 40 N at 40 cm from the fulcrum on the other side. What is the missing force in newtons?
12. 12.💪 Is pressing a doorbell a push or a pull? (a) a push (b) a pull
13. 13.Which of these is caused by friction? (a) squeezing a lemon (b) lifting a school bag (c) brakes stop a bicycle (d) a compass needle turns
14. 14.Which of these is an inclined plane? (a) a well-bucket rope wheel (b) a crowbar (c) a wheelchair ramp (d) a knife edge
15. 15.⚖️ Along a straight bar, measured from the left end, the effort is at 30 cm, the fulcrum at 80 cm and the load at 60 cm. Which class of lever is it? (a) class 1 (b) class 3 (c) class 2
16. 16.True or false: a fixed pulley halves the effort. (a) False (b) True
17. 17.🏋️ A longer ramp to the same height needs … (a) no effort (b) the same effort (c) less effort (d) more effort
18. 18.True or false: a movable pulley only changes direction. (a) True (b) False
19. 19.🪝 More rope sections holding a load means … (a) more effort needed (b) less effort needed (c) no change (d) the load floats
20. 20.True or false: a seesaw is a class 1 lever (fulcrum in the middle). (a) False (b) True
21. 21.🏋️ A force of 450 N pushes a cart 8 m along the floor. How much work is done, in joules?
22. 22.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 8 N, sandpaper 12 N, ice 1 N, a wooden plank 5 N. How many newtons more were needed on sandpaper than on ice?
23. 23.⚙️ Most simple machines make work easier by letting us … (a) make new energy (b) use a smaller force (c) switch off gravity (d) stop all friction
24. 24.⚖️ Which class of lever is a crowbar? (a) class 3 (b) class 1 (c) class 2
25. 25.⚖️ On a seesaw, a heavier child should sit … (a) anywhere (b) closer to the pivot (c) on the pivot (d) farther from the pivot
26. 26.⚖️ Along a straight bar, measured from the left end, the effort is at 10 cm, the fulcrum at 30 cm and the load at 40 cm. Which class of lever is it? (a) class 1 (b) class 2 (c) class 3
27. 27.🏋️ Pushing a crate 1 m took 160 J of work. What force was used, in newtons?
28. 28.🛞 More or less friction: a box pushed on carpet? (a) more friction (b) less friction
29. 29.🛞 Is friction helpful or a problem here: a knot holding a rope? (a) a problem (b) helpful
30. 30.True or false: a grippy rubber sole gives more friction. (a) True (b) False
31. 31.True or false: a pair of scissors is a class 2 lever (load in the middle). (a) False (b) True
32. 32.⚖️ A lever bar balances. The load is 180 N at 30 cm from the fulcrum. The effort is ? N at 60 cm from the fulcrum on the other side. What is the missing force in newtons?
33. 33.Which of these is caused by friction? (a) a rolling ball slows (b) a thrown ball comes down (c) squeezing a lemon (d) lifting a school bag
34. 34.🪝 A load of 200 N hangs from a pulley system in which 4 rope sections hold up the load. What effort is needed, in newtons? (ideal pulleys)
35. 35.⚖️ 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?
36. 36.True or false: pulling a cart is a pull. (a) False (b) True
37. 37.True or false: pulling up your socks is a push. (a) False (b) True
38. 38.⚖️ Turning effect = force × … (a) colour of bar (b) time taken (c) mass of fulcrum (d) distance from fulcrum
39. 39.⚖️ Which class of lever is a fishing rod? (a) class 3 (b) class 2 (c) class 1
40. 40.🏋️ In which unit is work measured? (a) metre (m) (b) watt hour (c) newton (N) (d) joule (J)

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