Engineering Worksheet: Part 2 Test

Engineering lesson 16: Part 2 test: forces and machines · Set 290 · 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.🪝 Fixed or movable pulley: which one halves the effort? (a) a fixed pulley (b) a movable pulley
2. 2.⚖️ Which class of lever is a pair of tweezers? (a) class 1 (b) class 2 (c) class 3
3. 3.🏋️ Pushing a crate 9 m took 2790 J of work. What force was used, in newtons?
4. 4.💪 Is plucking a mango a push or a pull? (a) a push (b) a pull
5. 5.True or false: drawing up a well bucket is a pull. (a) False (b) True
6. 6.True or false: a movable pulley needs effort = load. (a) True (b) False
7. 7.⚖️ In a class 2 lever, what is in the middle? (a) the load (b) the axle (c) the effort (d) the fulcrum
8. 8.🏋️ A 10 kg box is lifted straight up by 3 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
9. 9.True or false: a lemon squeezer is a class 1 lever (fulcrum in the middle). (a) False (b) True
10. 10.True or false: a crowbar is a lever. (a) True (b) False
11. 11.🛞 Is friction helpful or a problem here: writing with a pencil? (a) a problem (b) helpful
12. 12.True or false: a fixed pulley stays in one place. (a) False (b) True
13. 13.True or false: a pair of pliers is a class 1 lever (fulcrum in the middle). (a) False (b) True
14. 14.🛞 Which surface gives the MOST friction to a sliding block? (a) polished marble (b) glass (c) sandpaper (d) ice
15. 15.True or false: your forearm is a class 3 lever (effort in the middle). (a) True (b) False
16. 16.🏋️ A machine lifts a load of 240 N when you push with 40 N. What is its mechanical advantage (MA)?
17. 17.🏋️ Pushing a crate 7 m took 2310 J of work. What force was used, in newtons?
18. 18.🪝 A winch has a wheel of radius 5 cm and an axle of radius 1 cm. What effort on the wheel lifts a 150 N bucket on the axle, in newtons? (ideal)
19. 19.⚖️ Turning effect = force × … (a) mass of fulcrum (b) time taken (c) distance from fulcrum (d) colour of bar
20. 20.True or false: a rough doormat gives less friction. (a) False (b) True
21. 21.True or false: a crane hook block is a screw. (a) False (b) True
22. 22.💪 Two children push a box to the right, one with 40 N and the other with 90 N. What is the net (total) force on the box, in newtons?
23. 23.🛞 Rubbing your hands fast makes them … (a) wet (b) magnetic (c) warm (d) cold
24. 24.🔍 Which is the odd one out? (a) a crane hook block (b) a flagpole rope wheel (c) a nutcracker (d) a window blind cord
25. 25.🏋️ A smooth ramp is 6 m long and rises 3 m. What effort pushes a 1400 N box up it, in newtons? (ideal ramp, no friction)
26. 26.🪝 A pulley system lifts a 560 N load with an effort of 140 N. What is its mechanical advantage (MA)?
27. 27.True or false: a lemon squeezer is a class 3 lever (effort in the middle). (a) False (b) True
28. 28.🏋️ A smooth ramp is 15 m long and rises 3 m. What effort pushes a 250 N box up it, in newtons? (ideal ramp, no friction)
29. 29.💪 Is kicking a football a push or a pull? (a) a push (b) a pull
30. 30.🛞 More or less friction: a wet tiled floor? (a) more friction (b) less friction
31. 31.Which of these is a screw? (a) a crane hook block (b) an axe blade (c) a well winch handle (d) a bottle cap
32. 32.💪 Which force is at work: a river flows downhill? (a) magnetic force (b) gravity (c) friction (d) muscular force
33. 33.🪝 A load of 500 N hangs from a pulley system in which 2 rope sections hold up the load. What effort is needed, in newtons? (ideal pulleys)
34. 34.Which of these is caused by gravity? (a) squeezing a lemon (b) a compass needle turns (c) an apple falls down (d) brakes stop a bicycle
35. 35.🔍 Which is the odd one out? (a) a grippy rubber sole (b) a wheel on ball bearings (c) a smooth steel slide (d) a wet tiled floor
36. 36.🏋️ A machine lifts a load of 320 N when you push with 160 N. What is its mechanical advantage (MA)?
37. 37.⚖️ Along a straight bar, measured from the left end, the effort is at 40 cm, the fulcrum at 20 cm and the load at 70 cm. Which class of lever is it? (a) class 2 (b) class 1 (c) class 3
38. 38.⚖️ A lever bar balances. The load is 320 N at 30 cm from the fulcrum. The effort is ? N at 80 cm from the fulcrum on the other side. What is the missing force in newtons?
39. 39.🏋️ A machine lifts a load of 80 N when you push with 40 N. What is its mechanical advantage (MA)?
40. 40.💪 Which force pulls everything towards the Earth? (a) wind (b) magnetism (c) friction (d) gravity

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