Engineering Worksheet: Part 2 Test

Engineering lesson 16: Part 2 test: forces and machines · Set 489 · 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 wedge is … (a) a bar on a pivot (b) a rope on a wheel (c) a wheel on a rod (d) two ramps back to back
2. 2.🔍 Which is the odd one out? (a) a rough doormat (b) skating on ice (c) oil on a squeaky hinge (d) a wet tiled floor
3. 3.🛞 More or less friction: oil on a squeaky hinge? (a) more friction (b) less friction
4. 4.🪝 A pulley system lifts a 580 N load with an effort of 290 N. What is its mechanical advantage (MA)?
5. 5.🪝 Fixed or movable pulley: which one only changes direction? (a) a fixed pulley (b) a movable pulley
6. 6.⚖️ A lever bar balances. The load is ? N at 40 cm from the fulcrum. The effort is 80 N at 90 cm from the fulcrum on the other side. What is the missing force in newtons?
7. 7.⚖️ A lever bar balances. The load is ? N at 20 cm from the fulcrum. The effort is 80 N at 50 cm from the fulcrum on the other side. What is the missing force in newtons?
8. 8.True or false: plucking a mango is a pull. (a) True (b) False
9. 9.🪝 A pulley system lifts a 120 N load with an effort of 30 N. What is its mechanical advantage (MA)?
10. 10.True or false: pressing a doorbell is a pull. (a) False (b) True
11. 11.💪 Which force pulls everything towards the Earth? (a) friction (b) gravity (c) magnetism (d) wind
12. 12.🏋️ A force of 230 N pushes a cart 4 m along the floor. How much work is done, in joules?
13. 13.🔍 Which is the odd one out? (a) a bottle cap (b) a wood screw (c) a screw jack (d) a well-bucket rope wheel
14. 14.True or false: drawing up a well bucket is a push. (a) True (b) False
15. 15.🪝 A load of 280 N hangs from a pulley system in which 4 rope sections hold up the load. What effort is needed, in newtons? (ideal pulleys)
16. 16.True or false: a wheelbarrow is a class 2 lever (load in the middle). (a) True (b) False
17. 17.🪝 A load of 300 N hangs from a pulley system in which 2 rope sections hold up the load. What effort is needed, in newtons? (ideal pulleys)
18. 18.⚖️ Along a straight bar, measured from the left end, the effort is at 30 cm, the fulcrum at 70 cm and the load at 80 cm. Which class of lever is it? (a) class 2 (b) class 3 (c) class 1
19. 19.🏋️ A longer ramp to the same height needs … (a) no effort (b) the same effort (c) less effort (d) more effort
20. 20.🛞 Rubbing your hands fast makes them … (a) warm (b) cold (c) magnetic (d) wet
21. 21.⚖️ Which class of lever is a pair of scissors? (a) class 1 (b) class 2 (c) class 3
22. 22.🪝 A pulley system has 1 rope section holding up the load. To lift the load by 6 m, how many metres of rope must you pull?
23. 23.🏋️ Pushing a crate 2 m took 420 J of work. What force was used, in newtons?
24. 24.🔍 Which is the odd one out? (a) a seesaw (b) a playground slide (c) a wheelchair ramp (d) a road up a hill
25. 25.💪 Is closing a drawer a push or a pull? (a) a push (b) a pull
26. 26.🪝 A pulley system has 3 rope sections holding up the load. To lift the load by 6 m, how many metres of rope must you pull?
27. 27.🪝 Fixed or movable pulley: which one stays in one place? (a) a movable pulley (b) a fixed pulley
28. 28.⚖️ To lift a heavy rock with a crowbar more easily, push … (a) on the rock (b) far from the fulcrum (c) near the fulcrum (d) on the fulcrum
29. 29.True or false: pushing a trolley is a push. (a) True (b) False
30. 30.🏋️ Pushing a crate 1 m took 420 J of work. What force was used, in newtons?
31. 31.🔍 Which is the odd one out? (a) a crowbar (b) a well-bucket rope wheel (c) a crane hook block (d) a flagpole rope wheel
32. 32.💪 Which force is at work: an apple falls down? (a) gravity (b) friction (c) magnetic force (d) muscular force
33. 33.🛞 More or less friction: a smooth steel slide? (a) less friction (b) more friction
34. 34.🛞 More or less friction: sand on a slippery path? (a) more friction (b) less friction
35. 35.True or false: a wheelbarrow is a class 1 lever (fulcrum in the middle). (a) False (b) True
36. 36.True or false: a movable pulley only changes direction. (a) False (b) True
37. 37.🏋️ A force of 480 N did 2880 J of work. How many metres did the object move?
38. 38.🪝 A pulley system has 3 rope sections holding up the load. To lift the load by 2 m, how many metres of rope must you pull?
39. 39.⚖️ A lever bar balances. The load is 210 N at 50 cm from the fulcrum. The effort is ? N at 30 cm from the fulcrum on the other side. What is the missing force in newtons?
40. 40.🏋️ Pushing a crate 3 m took 660 J of work. What force was used, in newtons?

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