Engineering Worksheet: Part 2 Test

Engineering lesson 16: Part 2 test: forces and machines · Set 926 · 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.⚖️ In a class 1 lever, what is in the middle? (a) the load (b) nothing (c) the fulcrum (d) the effort
2. 2.True or false: a lemon squeezer is a class 1 lever (fulcrum in the middle). (a) True (b) False
3. 3.True or false: a pair of kitchen tongs is a class 1 lever (fulcrum in the middle). (a) False (b) True
4. 4.⚖️ A lever bar balances. The load is 120 N at ? cm from the fulcrum. The effort is 30 N at 40 cm from the fulcrum on the other side. What is the missing distance in centimetres?
5. 5.⚖️ A seesaw balances. Kabir (? N) sits 2 m from the pivot on one side; Zoya (200 N) sits 1 m from the pivot on the other side. What is the missing weight in newtons?
6. 6.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 7 N, a carpet 11 N, sandpaper 12 N, a glass sheet 4 N. Which surface gave the most friction? (a) sandpaper (b) a wooden plank (c) a glass sheet (d) a carpet
7. 7.⚖️ A seesaw balances. Ravi (? N) sits 4 m from the pivot on one side; Meena (400 N) sits 4 m from the pivot on the other side. What is the missing weight in newtons?
8. 8.True or false: a crane hook block is a pulley. (a) True (b) False
9. 9.True or false: pulling up your socks is a push. (a) True (b) False
10. 10.🪝 A load of 220 N hangs from a pulley system in which 2 rope sections hold up the load. What effort is needed, in newtons? (ideal pulleys)
11. 11.💪 A box weighs 380 N. Taking 1 kg to weigh about 10 N, what is its mass in kilograms?
12. 12.🪝 A pulley system has 3 rope sections holding up the load. To lift the load by 4 m, how many metres of rope must you pull?
13. 13.⚖️ A lever bar balances. The load is 320 N at 30 cm from the fulcrum. The effort is ? N at 40 cm from the fulcrum on the other side. What is the missing force in newtons?
14. 14.⚖️ Along a straight bar, measured from the left end, the effort is at 40 cm, the fulcrum at 20 cm and the load at 30 cm. Which class of lever is it? (a) class 3 (b) class 1 (c) class 2
15. 15.🪝 Fixed or movable pulley: which one makes you pull 2× rope? (a) a fixed pulley (b) a movable pulley
16. 16.Which of these is an inclined plane? (a) a crowbar (b) a window blind cord (c) a bottle opener (d) a road up a hill
17. 17.Which of these is caused by magnetic force? (a) brakes stop a bicycle (b) an apple falls down (c) a magnet picks up pins (d) pedalling a cycle
18. 18.⚖️ Which class of lever is a seesaw? (a) class 1 (b) class 3 (c) class 2
19. 19.⚙️ Which simple machine is a chisel? (a) wheel and axle (b) pulley (c) inclined plane (d) wedge
20. 20.⚖️ A seesaw balances. Meena (220 N) sits ? m from the pivot on one side; Ravi (440 N) sits 2 m from the pivot on the other side. What is the missing distance in metres?
21. 21.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 1 N, a glass sheet 4 N, a wooden plank 7 N, sandpaper 10 N. Which surface gave the least friction? (a) a wooden plank (b) ice (c) sandpaper (d) a glass sheet
22. 22.🪝 A bucket weighing 250 N is lifted with a single fixed pulley at the top of a well. What effort is needed, in newtons? (ideal pulley, no friction)
23. 23.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 8 N, sandpaper 9 N, a glass sheet 3 N, a wooden plank 4 N. Which surface gave the most friction? (a) a carpet (b) a wooden plank (c) sandpaper (d) a glass sheet
24. 24.True or false: a crowbar is a class 1 lever (fulcrum in the middle). (a) True (b) False
25. 25.Which of these is caused by muscular force? (a) shoes grip the floor (b) a thrown ball comes down (c) rain falls to the ground (d) squeezing a lemon
26. 26.⚖️ What is the pivot point of a lever called? (a) the load (b) the effort (c) the fulcrum (d) the axle
27. 27.⚖️ Which class of lever is a pair of tweezers? (a) class 3 (b) class 2 (c) class 1
28. 28.🏋️ A force of 400 N did 4000 J of work. How many metres did the object move?
29. 29.⚖️ 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 3 (b) class 2 (c) class 1
30. 30.🏋️ A smooth ramp is 4 m long and rises 2 m. What effort pushes a 400 N box up it, in newtons? (ideal ramp, no friction)
31. 31.⚖️ A seesaw balances. Meena (? N) sits 1 m from the pivot on one side; Ravi (190 N) sits 1 m from the pivot on the other side. What is the missing weight in newtons?
32. 32.Which of these is caused by gravity? (a) a rolling ball slows (b) a magnet picks up pins (c) a river flows downhill (d) squeezing a lemon
33. 33.⚖️ A seesaw balances. Arjun (? N) sits 2 m from the pivot on one side; Ravi (200 N) sits 3 m from the pivot on the other side. What is the missing weight in newtons?
34. 34.💪 Two children push a box to the right, one with 30 N and the other with 80 N. What is the net (total) force on the box, in newtons?
35. 35.Which of these is a pulley? (a) a bottle opener (b) a well-bucket rope wheel (c) a water tap handle (d) a wood screw
36. 36.⚙️ Which simple machine is a steering wheel? (a) inclined plane (b) lever (c) screw (d) wheel and axle
37. 37.True or false: a wheelchair ramp is a wheel and axle. (a) False (b) True
38. 38.💪 In a tug of war, one team pulls right with 95 N and the other pulls left with 85 N. What is the size of the net force, in newtons?
39. 39.💪 Is closing a drawer a push or a pull? (a) a pull (b) a push
40. 40.🛞 More or less friction: a box pushed on carpet? (a) more friction (b) less friction

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