Engineering Worksheet: Part 2 Test

Engineering lesson 16: Part 2 test: forces and machines · Set 122 · 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 0 cm, the fulcrum at 20 cm and the load at 40 cm. Which class of lever is it? (a) class 3 (b) class 1 (c) class 2
2. 2.🛞 Is friction helpful or a problem here: machine parts heating up? (a) helpful (b) a problem
3. 3.💪 In a tug of war, one team pulls right with 85 N and the other pulls left with 5 N. What is the size of the net force, in newtons?
4. 4.⚙️ Which simple machine is a chisel? (a) wheel and axle (b) lever (c) pulley (d) wedge
5. 5.⚖️ On a seesaw, a heavier child should sit … (a) closer to the pivot (b) farther from the pivot (c) on the pivot (d) anywhere
6. 6.⚖️ Along a straight bar, measured from the left end, the effort is at 20 cm, the fulcrum at 10 cm and the load at 30 cm. Which class of lever is it? (a) class 2 (b) class 3 (c) class 1
7. 7.💪 In which unit do we measure force? (a) metre (m) (b) litre (L) (c) newton (N) (d) second (s)
8. 8.⚖️ Which class of lever is a beam balance? (a) class 2 (b) class 3 (c) class 1
9. 9.True or false: a pair of pliers is a class 2 lever (load in the middle). (a) False (b) True
10. 10.⚖️ Along a straight bar, measured from the left end, the effort is at 70 cm, the fulcrum at 30 cm and the load at 100 cm. Which class of lever is it? (a) class 3 (b) class 1 (c) class 2
11. 11.🪝 A pulley system lifts a 420 N load with an effort of 210 N. What is its mechanical advantage (MA)?
12. 12.⚖️ A lever bar balances. The load is ? N at 30 cm from the fulcrum. The effort is 180 N at 60 cm from the fulcrum on the other side. What is the missing force in newtons?
13. 13.🔍 Which is the odd one out? (a) powder on a carrom board (b) a rough doormat (c) a grippy rubber sole (d) a tyre with deep treads
14. 14.🪝 A load of 210 N hangs from a pulley system in which 3 rope sections hold up the load. What effort is needed, in newtons? (ideal pulleys)
15. 15.True or false: a knife edge is a wedge. (a) True (b) False
16. 16.🏋️ Pushing a crate 3 m took 510 J of work. What force was used, in newtons?
17. 17.⚖️ A lever bar balances. The load is ? N at 30 cm from the fulcrum. The effort is 210 N at 30 cm from the fulcrum on the other side. What is the missing force in newtons?
18. 18.⚙️ Which simple machine is an axe blade? (a) wedge (b) screw (c) lever (d) pulley
19. 19.🛞 More or less friction: a grippy rubber sole? (a) more friction (b) less friction
20. 20.⚖️ A seesaw balances. Arjun (450 N) sits 4 m from the pivot on one side; Zoya (? N) sits 3 m from the pivot on the other side. What is the missing weight in newtons?
21. 21.Which of these is a screw? (a) a knife edge (b) a door stopper (c) a bottle cap (d) a flagpole rope wheel
22. 22.🪝 More rope sections holding a load means … (a) the load floats (b) more effort needed (c) less effort needed (d) no change
23. 23.🏋️ A smooth ramp is 6 m long and rises 2 m. What effort pushes a 900 N box up it, in newtons? (ideal ramp, no friction)
24. 24.🏋️ In which unit is work measured? (a) metre (m) (b) newton (N) (c) watt hour (d) joule (J)
25. 25.⚖️ A lever bar balances. The load is 40 N at ? cm from the fulcrum. The effort is 20 N at 40 cm from the fulcrum on the other side. What is the missing distance in centimetres?
26. 26.🛞 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, a carpet 9 N. Which surface gave the most friction? (a) ice (b) a glass sheet (c) a carpet (d) a wooden plank
27. 27.Which of these is caused by gravity? (a) an apple falls down (b) a rolling ball slows (c) squeezing a lemon (d) brakes stop a bicycle
28. 28.⚖️ A lever bar balances. The load is 300 N at 20 cm from the fulcrum. The effort is 60 N at ? cm from the fulcrum on the other side. What is the missing distance in centimetres?
29. 29.Which of these is a screw? (a) a wood screw (b) a truck loading ramp (c) a road up a hill (d) the tip of a nail
30. 30.🔍 Which is the odd one out? (a) a well-bucket rope wheel (b) a crane hook block (c) a screw jack (d) a flagpole rope wheel
31. 31.⚙️ How many simple machines are there in the usual list? (a) 12 (b) 3 (c) 6 (d) 10
32. 32.⚖️ A lever bar balances. The load is ? N at 40 cm from the fulcrum. The effort is 80 N at 80 cm from the fulcrum on the other side. What is the missing force in newtons?
33. 33.💪 A box weighs 340 N. Taking 1 kg to weigh about 10 N, what is its mass in kilograms?
34. 34.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 7 N, ice 1 N, a glass sheet 2 N, a carpet 3 N. Which surface gave the most friction? (a) ice (b) a carpet (c) sandpaper (d) a glass sheet
35. 35.Which of these is a pulley? (a) a well-bucket rope wheel (b) a nut and bolt (c) a wheelchair ramp (d) a door stopper
36. 36.⚖️ A lever bar balances. The load is 60 N at 50 cm from the fulcrum. The effort is ? N at 60 cm from the fulcrum on the other side. What is the missing force in newtons?
37. 37.🪝 A bucket weighing 100 N is lifted with a single fixed pulley at the top of a well. What effort is needed, in newtons? (ideal pulley, no friction)
38. 38.⚙️ Most simple machines make work easier by letting us … (a) make new energy (b) switch off gravity (c) stop all friction (d) use a smaller force
39. 39.⚖️ Along a straight bar, measured from the left end, the effort is at 30 cm, the fulcrum at 60 cm and the load at 20 cm. Which class of lever is it? (a) class 3 (b) class 2 (c) class 1
40. 40.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 7 N, sandpaper 9 N, a glass sheet 2 N, a wooden plank 6 N. Which surface gave the most friction? (a) a glass sheet (b) a wooden plank (c) a carpet (d) sandpaper

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