Engineering Worksheet: Part 2 Test

Engineering lesson 16: Part 2 test: forces and machines · Set 844 · 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 15 kg box is lifted straight up by 3 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
2. 2.Which of these is caused by muscular force? (a) rubbing hands warms them (b) a fridge magnet sticks (c) rain falls to the ground (d) squeezing a lemon
3. 3.⚖️ A seesaw balances. Arjun (320 N) sits ? m from the pivot on one side; Zoya (480 N) sits 2 m from the pivot on the other side. What is the missing distance in metres?
4. 4.⚖️ A seesaw balances. Ravi (100 N) sits 1 m from the pivot on one side; Asha (100 N) sits ? m from the pivot on the other side. What is the missing distance in metres?
5. 5.🏋️ A smooth ramp is 5 m long and rises 1 m. What effort pushes a 5000 N box up it, in newtons? (ideal ramp, no friction)
6. 6.🛞 Is friction helpful or a problem here: writing with a pencil? (a) helpful (b) a problem
7. 7.True or false: sand on a slippery path gives less friction. (a) True (b) False
8. 8.True or false: powder on a carrom board gives more friction. (a) False (b) True
9. 9.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 7 N, a glass sheet 1 N, a wooden plank 4 N, a carpet 5 N. Which surface gave the least friction? (a) sandpaper (b) a wooden plank (c) a glass sheet (d) a carpet
10. 10.⚖️ Which class of lever is a fishing rod? (a) class 1 (b) class 2 (c) class 3
11. 11.True or false: skating on ice gives less friction. (a) False (b) True
12. 12.🏋️ A longer ramp to the same height needs … (a) the same effort (b) no effort (c) more effort (d) less effort
13. 13.True or false: a beam balance is a class 1 lever (fulcrum in the middle). (a) False (b) True
14. 14.🏋️ Pushing a crate 8 m took 320 J of work. What force was used, in newtons?
15. 15.🏋️ Work is done when a force moves something … (a) through a distance (b) without moving it (c) very slowly (d) only upwards
16. 16.True or false: a nutcracker is a class 2 lever (load in the middle). (a) False (b) True
17. 17.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 1 N, a glass sheet 2 N, a wooden plank 4 N, sandpaper 8 N. Which surface gave the most friction? (a) a glass sheet (b) a wooden plank (c) ice (d) sandpaper
18. 18.True or false: a crowbar is a class 1 lever (fulcrum in the middle). (a) True (b) False
19. 19.True or false: a pair of kitchen tongs is a class 3 lever (effort in the middle). (a) False (b) True
20. 20.🔍 Which is the odd one out? (a) chalk on a gym bar (b) a tyre with deep treads (c) a smooth steel slide (d) sand on a slippery path
21. 21.🏋️ A smooth ramp is 6 m long and rises 1 m. What effort pushes a 6000 N box up it, in newtons? (ideal ramp, no friction)
22. 22.True or false: sand on a slippery path gives more friction. (a) True (b) False
23. 23.⚖️ Along a straight bar, measured from the left end, the effort is at 30 cm, the fulcrum at 80 cm and the load at 60 cm. Which class of lever is it? (a) class 2 (b) class 3 (c) class 1
24. 24.🛞 More or less friction: a grippy rubber sole? (a) less friction (b) more friction
25. 25.🪝 A pulley system has 3 rope sections holding up the load. To lift the load by 2 m, how many metres of rope must you pull?
26. 26.🏋️ Pushing a crate 3 m took 1110 J of work. What force was used, in newtons?
27. 27.🔍 Which is the odd one out? (a) a rough doormat (b) a tyre with deep treads (c) a box pushed on carpet (d) a wheel on ball bearings
28. 28.⚙️ A wedge is … (a) a rope on a wheel (b) a bar on a pivot (c) a wheel on a rod (d) two ramps back to back
29. 29.True or false: a beam balance is a class 3 lever (effort in the middle). (a) True (b) False
30. 30.⚖️ Along a straight bar, measured from the left end, the effort is at 0 cm, the fulcrum at 30 cm and the load at 10 cm. Which class of lever is it? (a) class 1 (b) class 3 (c) class 2
31. 31.🔍 Which is the odd one out? (a) a box pushed on carpet (b) a rough doormat (c) oil on a squeaky hinge (d) sand on a slippery path
32. 32.🛞 Which surface gives the MOST friction to a sliding block? (a) ice (b) glass (c) sandpaper (d) polished marble
33. 33.⚖️ A lever bar balances. The load is 200 N at ? cm from the fulcrum. The effort is 300 N at 20 cm from the fulcrum on the other side. What is the missing distance in centimetres?
34. 34.⚖️ A lever balances when … (a) the bar is short (b) the fulcrum moves (c) turning effects match (d) both weights are equal
35. 35.💪 In a tug of war, one team pulls right with 25 N and the other pulls left with 15 N. What is the size of the net force, in newtons?
36. 36.🛞 Why are tyres made with deep treads? (a) to look nice (b) to grip the road (c) to save rubber (d) to go slower
37. 37.🪝 A bucket weighing 90 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.💪 Is pushing a trolley a push or a pull? (a) a pull (b) a push
39. 39.⚖️ In a class 1 lever, what is in the middle? (a) the fulcrum (b) the effort (c) nothing (d) the load
40. 40.🪝 A load of 200 N hangs from a pulley system in which 2 rope sections hold up the load. What effort is needed, in newtons? (ideal pulleys)

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