Engineering Worksheet: Part 2 Test

Engineering lesson 16: Part 2 test: forces and machines · Set 237 · 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 force of 150 N did 900 J of work. How many metres did the object move?
2. 2.True or false: powder on a carrom board gives less friction. (a) False (b) True
3. 3.🪝 A load of 1000 N hangs from a pulley system in which 4 rope sections hold up the load. What effort is needed, in newtons? (ideal pulleys)
4. 4.⚖️ Which class of lever is a crowbar? (a) class 2 (b) class 1 (c) class 3
5. 5.💪 A box weighs 500 N. Taking 1 kg to weigh about 10 N, what is its mass in kilograms?
6. 6.⚖️ Along a straight bar, measured from the left end, the effort is at 10 cm, the fulcrum at 70 cm and the load at 40 cm. Which class of lever is it? (a) class 3 (b) class 2 (c) class 1
7. 7.Which of these is caused by muscular force? (a) an apple falls down (b) lifting a school bag (c) rain falls to the ground (d) brakes stop a bicycle
8. 8.Which of these is caused by friction? (a) a thrown ball comes down (b) rubbing hands warms them (c) squeezing a lemon (d) pedalling a cycle
9. 9.🪝 A load of 680 N hangs from a pulley system in which 4 rope sections hold up the load. What effort is needed, in newtons? (ideal pulleys)
10. 10.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 11 N, ice 4 N, a wooden plank 5 N, a carpet 9 N. Which surface gave the most friction? (a) ice (b) a carpet (c) sandpaper (d) a wooden plank
11. 11.🪝 A well winch has a handle (wheel) of radius 6 cm turning an axle of radius 3 cm. What is its mechanical advantage (MA)?
12. 12.⚙️ Which simple machine is a knife edge? (a) wedge (b) inclined plane (c) screw (d) lever
13. 13.True or false: a bottle opener is a class 1 lever (fulcrum in the middle). (a) False (b) True
14. 14.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 3 N, a wooden plank 7 N, a carpet 8 N, sandpaper 11 N. Which surface gave the most friction? (a) a carpet (b) sandpaper (c) a wooden plank (d) a glass sheet
15. 15.🪝 A pulley system lifts a 150 N load with an effort of 50 N. What is its mechanical advantage (MA)?
16. 16.🛞 Is friction helpful or a problem here: machine parts heating up? (a) helpful (b) a problem
17. 17.⚖️ A lever bar balances. The load is ? N at 40 cm from the fulcrum. The effort is 200 N at 90 cm from the fulcrum on the other side. What is the missing force in newtons?
18. 18.💪 A bag has a mass of 6 kg. Taking 1 kg to weigh about 10 N, what is its weight in newtons?
19. 19.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 3 N, a glass sheet 6 N, a wooden plank 7 N, sandpaper 8 N. Which surface gave the least friction? (a) sandpaper (b) a glass sheet (c) a wooden plank (d) ice
20. 20.🏋️ Work is done when a force moves something … (a) without moving it (b) only upwards (c) through a distance (d) very slowly
21. 21.🏋️ Pushing a crate 4 m took 120 J of work. What force was used, in newtons?
22. 22.True or false: a wet tiled floor gives more friction. (a) False (b) True
23. 23.💪 Is closing a drawer a push or a pull? (a) a push (b) a pull
24. 24.⚖️ A lever balances when … (a) both weights are equal (b) the bar is short (c) the fulcrum moves (d) turning effects match
25. 25.🪝 A pulley system lifts a 140 N load with an effort of 70 N. What is its mechanical advantage (MA)?
26. 26.💪 Which force is at work: pedalling a cycle? (a) friction (b) muscular force (c) gravity (d) magnetic force
27. 27.⚖️ A lever bar balances. The load is ? N at 20 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?
28. 28.Which of these is a wedge? (a) a steering wheel (b) a bottle opener (c) an axe blade (d) a jar lid
29. 29.🪝 A well winch has a handle (wheel) of radius 10 cm turning an axle of radius 2 cm. What is its mechanical advantage (MA)?
30. 30.💪 Is drawing up a well bucket a push or a pull? (a) a pull (b) a push
31. 31.⚖️ A lever bar balances. The load is 80 N at ? cm from the fulcrum. The effort is 10 N at 80 cm from the fulcrum on the other side. What is the missing distance in centimetres?
32. 32.⚖️ Which class of lever is a pair of tweezers? (a) class 1 (b) class 2 (c) class 3
33. 33.True or false: drawing up a well bucket is a pull. (a) False (b) True
34. 34.💪 Which force is at work: a thrown ball comes down? (a) magnetic force (b) gravity (c) friction (d) muscular force
35. 35.True or false: a fixed pulley rises with the load. (a) False (b) True
36. 36.🏋️ Pushing a crate 8 m took 3280 J of work. What force was used, in newtons?
37. 37.⚖️ Along a straight bar, measured from the left end, the effort is at 30 cm, the fulcrum at 0 cm and the load at 60 cm. Which class of lever is it? (a) class 3 (b) class 1 (c) class 2
38. 38.🏋️ A force of 470 N pushes a cart 7 m along the floor. How much work is done, in joules?
39. 39.True or false: the tip of a nail is a wheel and axle. (a) True (b) False
40. 40.🪝 A bucket weighing 190 N is lifted with a single fixed pulley at the top of a well. What effort is needed, in newtons? (ideal pulley, no friction)

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