Engineering Worksheet: Part 2 Test

Engineering lesson 16: Part 2 test: forces and machines · Set 24 · 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.💪 Is closing a drawer a push or a pull? (a) a pull (b) a push
2. 2.💪 Which force is at work: a thrown ball comes down? (a) friction (b) muscular force (c) gravity (d) magnetic force
3. 3.⚖️ What is the pivot point of a lever called? (a) the fulcrum (b) the load (c) the effort (d) the axle
4. 4.True or false: your forearm is a class 3 lever (effort in the middle). (a) True (b) False
5. 5.💪 Is plucking a mango a push or a pull? (a) a pull (b) a push
6. 6.💪 Is a tug of war a push or a pull? (a) a pull (b) a push
7. 7.⚖️ A lever bar balances. The load is ? N at 50 cm from the fulcrum. The effort is 150 N at 50 cm from the fulcrum on the other side. What is the missing force in newtons?
8. 8.💪 In which unit do we measure force? (a) metre (m) (b) litre (L) (c) newton (N) (d) second (s)
9. 9.True or false: a fixed pulley hangs on the rope loop. (a) False (b) True
10. 10.🏋️ In which unit is work measured? (a) newton (N) (b) watt hour (c) metre (m) (d) joule (J)
11. 11.True or false: plucking a mango is a push. (a) False (b) True
12. 12.💪 Which can a force NOT do? (a) stop it moving (b) start it moving (c) change its colour (d) change its shape
13. 13.💪 Is kicking a football a push or a pull? (a) a push (b) a pull
14. 14.⚖️ Which class of lever is your forearm? (a) class 1 (b) class 3 (c) class 2
15. 15.🏋️ A smooth ramp is 8 m long and rises 2 m. What effort pushes a 3600 N box up it, in newtons? (ideal ramp, no friction)
16. 16.🪝 A winch has a wheel of radius 21 cm and an axle of radius 3 cm. What effort on the wheel lifts a 280 N bucket on the axle, in newtons? (ideal)
17. 17.🛞 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 9 N, sandpaper 13 N. Which surface gave the most friction? (a) a glass sheet (b) sandpaper (c) a wooden plank (d) a carpet
18. 18.True or false: oil on a squeaky hinge gives less friction. (a) True (b) False
19. 19.🛞 More or less friction: oil on a squeaky hinge? (a) less friction (b) more friction
20. 20.🪝 A bucket weighing 370 N is lifted with a single fixed pulley at the top of a well. What effort is needed, in newtons? (ideal pulley, no friction)
21. 21.⚖️ Turning effect = force × … (a) mass of fulcrum (b) distance from fulcrum (c) time taken (d) colour of bar
22. 22.🪝 A pulley system has 3 rope sections holding up the load. To lift the load by 7 m, how many metres of rope must you pull?
23. 23.True or false: a well-bucket rope wheel is a lever. (a) False (b) True
24. 24.⚖️ Along a straight bar, measured from the left end, the effort is at 20 cm, the fulcrum at 40 cm and the load at 30 cm. Which class of lever is it? (a) class 2 (b) class 3 (c) class 1
25. 25.🏋️ A machine lifts a load of 250 N when you push with 50 N. What is its mechanical advantage (MA)?
26. 26.⚙️ Which simple machine is a well-bucket rope wheel? (a) screw (b) inclined plane (c) pulley (d) wedge
27. 27.⚖️ A lever bar balances. The load is ? N at 40 cm from the fulcrum. The effort is 160 N at 100 cm from the fulcrum on the other side. What is the missing force in newtons?
28. 28.🪝 A load of 360 N hangs from a pulley system in which 4 rope sections hold up the load. What effort is needed, in newtons? (ideal pulleys)
29. 29.⚖️ A seesaw balances. Zoya (560 N) sits 4 m from the pivot on one side; Arjun (? N) sits 4 m from the pivot on the other side. What is the missing weight in newtons?
30. 30.⚖️ On a seesaw, a heavier child should sit … (a) closer to the pivot (b) anywhere (c) on the pivot (d) farther from the pivot
31. 31.💪 Which force is at work: brakes stop a bicycle? (a) gravity (b) magnetic force (c) muscular force (d) friction
32. 32.Which of these is caused by gravity? (a) pedalling a cycle (b) brakes stop a bicycle (c) a compass needle turns (d) a thrown ball comes down
33. 33.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 8 N, sandpaper 12 N, a glass sheet 3 N, a wooden plank 5 N. Which surface gave the least friction? (a) a wooden plank (b) sandpaper (c) a carpet (d) a glass sheet
34. 34.True or false: a smooth steel slide gives less friction. (a) True (b) False
35. 35.⚖️ Along a straight bar, measured from the left end, the effort is at 10 cm, the fulcrum at 80 cm and the load at 40 cm. Which class of lever is it? (a) class 2 (b) class 1 (c) class 3
36. 36.True or false: pushing a swing is a push. (a) False (b) True
37. 37.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 1 N, a glass sheet 3 N, a wooden plank 6 N, a carpet 9 N. Which surface gave the least friction? (a) a wooden plank (b) a glass sheet (c) a carpet (d) ice
38. 38.💪 In a tug of war, one team pulls right with 10 N and the other pulls left with 5 N. What is the size of the net force, in newtons?
39. 39.🪝 More rope sections holding a load means … (a) no change (b) more effort needed (c) less effort needed (d) the load floats
40. 40.🛞 Why are tyres made with deep treads? (a) to grip the road (b) to save rubber (c) to look nice (d) to go slower

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