Engineering Worksheet: Part 2 Test

Engineering lesson 16: Part 2 test: forces and machines · Set 293 · 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.⚖️ Along a straight bar, measured from the left end, the effort is at 40 cm, the fulcrum at 60 cm and the load at 10 cm. Which class of lever is it? (a) class 2 (b) class 3 (c) class 1
2. 2.⚖️ A lever bar balances. The load is 100 N at ? cm from the fulcrum. The effort is 30 N at 100 cm from the fulcrum on the other side. What is the missing distance in centimetres?
3. 3.⚖️ A lever bar balances. The load is 320 N at 10 cm from the fulcrum. The effort is 80 N at ? cm from the fulcrum on the other side. What is the missing distance in centimetres?
4. 4.🏋️ A force of 480 N did 4800 J of work. How many metres did the object move?
5. 5.💪 Two children push a box to the right, one with 50 N and the other with 10 N. What is the net (total) force on the box, in newtons?
6. 6.💪 Which force is at work: an apple falls down? (a) magnetic force (b) friction (c) gravity (d) muscular force
7. 7.💪 A force is a … (a) unit of time (b) type of sound (c) push or a pull (d) kind of colour
8. 8.True or false: a water tap handle is an inclined plane. (a) False (b) True
9. 9.💪 A cart is pulled to the right with 100 N and to the left with 95 N. Which way does the net force act? (a) to the right (b) to the left (c) no net force
10. 10.🪝 A pulley system lifts a 520 N load with an effort of 130 N. What is its mechanical advantage (MA)?
11. 11.True or false: a fixed pulley stays in one place. (a) True (b) False
12. 12.⚖️ Which class of lever is a beam balance? (a) class 2 (b) class 3 (c) class 1
13. 13.💪 In which unit do we measure force? (a) second (s) (b) metre (m) (c) newton (N) (d) litre (L)
14. 14.Which of these is an inclined plane? (a) a chisel (b) a wheelchair ramp (c) a flagpole rope wheel (d) the tip of a nail
15. 15.🏋️ In which unit is work measured? (a) watt hour (b) joule (J) (c) newton (N) (d) metre (m)
16. 16.⚖️ Going along a lever from one end to the other, the order is: fulcrum, load, effort. Which class of lever is it? (a) class 1 (b) class 2 (c) class 3
17. 17.⚖️ Along a straight bar, measured from the left end, the effort is at 60 cm, the fulcrum at 20 cm and the load at 10 cm. Which class of lever is it? (a) class 2 (b) class 3 (c) class 1
18. 18.⚖️ Which class of lever is a lemon squeezer? (a) class 2 (b) class 1 (c) class 3
19. 19.🔍 Which is the odd one out? (a) a nutcracker (b) a seesaw (c) a crowbar (d) an axe blade
20. 20.True or false: a fixed pulley makes you pull 2× rope. (a) True (b) False
21. 21.🪝 A pulley system lifts a 200 N load with an effort of 50 N. What is its mechanical advantage (MA)?
22. 22.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 2 N, a glass sheet 3 N, a wooden plank 6 N, sandpaper 7 N. How many newtons more were needed on sandpaper than on ice?
23. 23.🏋️ A smooth ramp is 12 m long and rises 3 m. What effort pushes a 3600 N box up it, in newtons? (ideal ramp, no friction)
24. 24.🏋️ An 11 kg box is lifted straight up by 2 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
25. 25.🏋️ Pushing a crate 4 m took 800 J of work. What force was used, in newtons?
26. 26.⚖️ Along a straight bar, measured from the left end, the effort is at 0 cm, the fulcrum at 40 cm and the load at 30 cm. Which class of lever is it? (a) class 3 (b) class 2 (c) class 1
27. 27.🛞 Friction acts … (a) only on ice (b) only upwards (c) with the motion (d) against the motion
28. 28.🪝 A pulley system has 2 rope sections holding up the load. To lift the load by 6 m, how many metres of rope must you pull?
29. 29.🪝 Fixed or movable pulley: which one halves the effort? (a) a movable pulley (b) a fixed pulley
30. 30.💪 Is pulling a cart a push or a pull? (a) a push (b) a pull
31. 31.💪 Which force is at work: brakes stop a bicycle? (a) muscular force (b) gravity (c) magnetic force (d) friction
32. 32.⚖️ Which class of lever is a pair of scissors? (a) class 1 (b) class 2 (c) class 3
33. 33.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 9 N, ice 3 N, a glass sheet 4 N, a wooden plank 5 N. Which surface gave the least friction? (a) ice (b) a glass sheet (c) a carpet (d) a wooden plank
34. 34.Which of these is a wedge? (a) a truck loading ramp (b) a nutcracker (c) a wood screw (d) a knife edge
35. 35.🪝 A load of 870 N hangs from a pulley system in which 3 rope sections hold up the load. What effort is needed, in newtons? (ideal pulleys)
36. 36.🪝 A winch has a wheel of radius 9 cm and an axle of radius 3 cm. What effort on the wheel lifts a 360 N bucket on the axle, in newtons? (ideal)
37. 37.⚖️ Which class of lever is a nutcracker? (a) class 3 (b) class 2 (c) class 1
38. 38.⚖️ A lever bar balances. The load is 60 N at ? cm from the fulcrum. The effort is 80 N at 30 cm from the fulcrum on the other side. What is the missing distance in centimetres?
39. 39.💪 Which force is at work: pedalling a cycle? (a) gravity (b) muscular force (c) magnetic force (d) friction
40. 40.⚖️ In a class 2 lever, what is in the middle? (a) the effort (b) the load (c) the axle (d) the fulcrum

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