Engineering Worksheet: Part 2 Test

Engineering lesson 16: Part 2 test: forces and machines · Set 964 · 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.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 8 N, sandpaper 11 N, a glass sheet 4 N, a wooden plank 7 N. Which surface gave the least friction? (a) a glass sheet (b) a carpet (c) a wooden plank (d) sandpaper
2. 2.🏋️ A smooth ramp is 5 m long and rises 1 m. What effort pushes a 3500 N box up it, in newtons? (ideal ramp, no friction)
3. 3.💪 Is pulling a cart a push or a pull? (a) a push (b) a pull
4. 4.🛞 Which surface gives the MOST friction to a sliding block? (a) ice (b) polished marble (c) sandpaper (d) glass
5. 5.True or false: a box pushed on carpet gives less friction. (a) True (b) False
6. 6.⚖️ Which class of lever is a lemon squeezer? (a) class 1 (b) class 3 (c) class 2
7. 7.True or false: a fixed pulley only changes direction. (a) False (b) True
8. 8.💪 Is pressing a doorbell a push or a pull? (a) a pull (b) a push
9. 9.🪝 A load of 320 N hangs from a pulley system in which 2 rope sections hold up the load. What effort is needed, in newtons? (ideal pulleys)
10. 10.🔍 Which is the odd one out? (a) a nutcracker (b) a knife edge (c) a door stopper (d) an axe blade
11. 11.💪 A bag has a mass of 3 kg. Taking 1 kg to weigh about 10 N, what is its weight in newtons?
12. 12.🪝 A load of 450 N hangs from a pulley system in which 3 rope sections hold up the load. What effort is needed, in newtons? (ideal pulleys)
13. 13.💪 Is plucking a mango a push or a pull? (a) a pull (b) a push
14. 14.True or false: a fixed pulley hangs on the rope loop. (a) False (b) True
15. 15.True or false: a door stopper is a wedge. (a) True (b) False
16. 16.Which of these is a wheel and axle? (a) a nutcracker (b) a bottle opener (c) a round doorknob (d) a seesaw
17. 17.True or false: a movable pulley halves the effort. (a) False (b) True
18. 18.True or false: a wet tiled floor gives less friction. (a) False (b) True
19. 19.💪 Is opening a drawer a push or a pull? (a) a push (b) a pull
20. 20.🏋️ A machine lifts a load of 120 N when you push with 40 N. What is its mechanical advantage (MA)?
21. 21.⚖️ What is the pivot point of a lever called? (a) the effort (b) the fulcrum (c) the load (d) the axle
22. 22.True or false: a crane hook block is a pulley. (a) False (b) True
23. 23.⚖️ Which class of lever is a nutcracker? (a) class 3 (b) class 1 (c) class 2
24. 24.True or false: a seesaw is a class 3 lever (effort in the middle). (a) False (b) True
25. 25.🏋️ Pushing a crate 3 m took 1350 J of work. What force was used, in newtons?
26. 26.💪 Two children push a box to the right, one with 10 N and the other with 75 N. What is the net (total) force on the box, in newtons?
27. 27.🔍 Which is the odd one out? (a) a flagpole rope wheel (b) a round doorknob (c) a well-bucket rope wheel (d) a crane hook block
28. 28.💪 A force is a … (a) unit of time (b) kind of colour (c) type of sound (d) push or a pull
29. 29.True or false: a fixed pulley rises with the load. (a) False (b) True
30. 30.🪝 A load of 120 N hangs from a pulley system in which 4 rope sections hold up the load. What effort is needed, in newtons? (ideal pulleys)
31. 31.💪 In a tug of war, one team pulls left with 25 N and the other pulls right with 5 N. What is the size of the net force, in newtons?
32. 32.🔍 Which is the odd one out? (a) a crane hook block (b) the tip of a nail (c) a knife edge (d) a door stopper
33. 33.💪 A box weighs 140 N. Taking 1 kg to weigh about 10 N, what is its mass in kilograms?
34. 34.⚙️ Which simple machine is a nutcracker? (a) wedge (b) inclined plane (c) pulley (d) lever
35. 35.⚖️ A lever bar balances. The load is ? N at 30 cm from the fulcrum. The effort is 60 N at 80 cm from the fulcrum on the other side. What is the missing force in newtons?
36. 36.🏋️ A longer ramp to the same height needs … (a) less effort (b) more effort (c) the same effort (d) no effort
37. 37.💪 Which force is at work: rubbing hands warms them? (a) magnetic force (b) friction (c) muscular force (d) gravity
38. 38.💪 Which force is at work: a thrown ball comes down? (a) muscular force (b) magnetic force (c) gravity (d) friction
39. 39.⚖️ Going along a lever from one end to the other, the order is: fulcrum, load, effort. Which class of lever is it? (a) class 3 (b) class 1 (c) class 2
40. 40.⚖️ A seesaw balances. Kabir (? N) sits 3 m from the pivot on one side; Asha (300 N) sits 4 m from the pivot on the other side. What is the missing weight in newtons?

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