Engineering Worksheet: Part 2 Test

Engineering lesson 16: Part 2 test: forces and machines · Set 358 · 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.💪 Which force is at work: a compass needle turns? (a) gravity (b) muscular force (c) friction (d) magnetic force
2. 2.⚖️ Which class of lever is a pair of tweezers? (a) class 2 (b) class 1 (c) class 3
3. 3.⚖️ Going along a lever from one end to the other, the order is: fulcrum, effort, load. Which class of lever is it? (a) class 1 (b) class 2 (c) class 3
4. 4.⚖️ Which class of lever is a wheelbarrow? (a) class 2 (b) class 3 (c) class 1
5. 5.🛞 More or less friction: a smooth steel slide? (a) less friction (b) more friction
6. 6.🪝 A pulley system lifts a 210 N load with an effort of 70 N. What is its mechanical advantage (MA)?
7. 7.🪝 A load of 180 N hangs from a pulley system in which 2 rope sections hold up the load. What effort is needed, in newtons? (ideal pulleys)
8. 8.⚖️ Along a straight bar, measured from the left end, the effort is at 0 cm, the fulcrum at 10 cm and the load at 50 cm. Which class of lever is it? (a) class 2 (b) class 3 (c) class 1
9. 9.⚖️ Along a straight bar, measured from the left end, the effort is at 10 cm, the fulcrum at 90 cm and the load at 50 cm. Which class of lever is it? (a) class 2 (b) class 1 (c) class 3
10. 10.🏋️ Work is done when a force moves something … (a) only upwards (b) very slowly (c) without moving it (d) through a distance
11. 11.🔍 Which is the odd one out? (a) a wheel on ball bearings (b) a rough doormat (c) oil on a squeaky hinge (d) a smooth steel slide
12. 12.🏋️ In which unit is work measured? (a) watt hour (b) newton (N) (c) joule (J) (d) metre (m)
13. 13.⚖️ Along a straight bar, measured from the left end, the effort is at 90 cm, the fulcrum at 10 cm and the load at 50 cm. Which class of lever is it? (a) class 3 (b) class 2 (c) class 1
14. 14.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 3 N, a wooden plank 4 N, sandpaper 7 N, ice 1 N. How many newtons more were needed on sandpaper than on ice?
15. 15.⚙️ A wedge is … (a) a bar on a pivot (b) a rope on a wheel (c) two ramps back to back (d) a wheel on a rod
16. 16.🏋️ Pushing a crate 8 m took 1280 J of work. What force was used, in newtons?
17. 17.⚖️ Along a straight bar, measured from the left end, the effort is at 20 cm, the fulcrum at 30 cm and the load at 60 cm. Which class of lever is it? (a) class 3 (b) class 2 (c) class 1
18. 18.⚙️ Most simple machines make work easier by letting us … (a) stop all friction (b) use a smaller force (c) switch off gravity (d) make new energy
19. 19.True or false: a pair of pliers is a class 1 lever (fulcrum in the middle). (a) True (b) False
20. 20.⚖️ A seesaw balances. Ravi (? N) sits 3 m from the pivot on one side; Arjun (390 N) sits 4 m from the pivot on the other side. What is the missing weight in newtons?
21. 21.🪝 A well winch has a handle (wheel) of radius 24 cm turning an axle of radius 3 cm. What is its mechanical advantage (MA)?
22. 22.🏋️ Can a simple machine reduce the work done? (a) no, work stays the same (b) yes, by half (c) yes, always (d) only on Mondays
23. 23.🪝 A winch has a wheel of radius 4 cm and an axle of radius 2 cm. What effort on the wheel lifts a 340 N bucket on the axle, in newtons? (ideal)
24. 24.🪝 A pulley system has 4 rope sections holding up the load. To lift the load by 4 m, how many metres of rope must you pull?
25. 25.True or false: a lemon squeezer is a class 2 lever (load in the middle). (a) True (b) False
26. 26.🛞 More or less friction: powder on a carrom board? (a) less friction (b) more friction
27. 27.⚖️ A lever bar balances. The load is ? N at 50 cm from the fulcrum. The effort is 400 N at 40 cm from the fulcrum on the other side. What is the missing force in newtons?
28. 28.⚖️ A seesaw balances. Ravi (110 N) sits 3 m from the pivot on one side; Asha (? N) sits 1 m from the pivot on the other side. What is the missing weight in newtons?
29. 29.🔍 Which is the odd one out? (a) a wheelchair ramp (b) a playground slide (c) a road up a hill (d) a well-bucket rope wheel
30. 30.🏋️ A longer ramp to the same height needs … (a) the same effort (b) no effort (c) more effort (d) less effort
31. 31.💪 A cart is pulled to the right with 75 N and to the left with 60 N. Which way does the net force act? (a) no net force (b) to the right (c) to the left
32. 32.Which of these is caused by gravity? (a) shoes grip the floor (b) rubbing hands warms them (c) a river flows downhill (d) a rolling ball slows
33. 33.💪 In a tug of war, one team pulls left with 40 N and the other pulls right with 30 N. What is the size of the net force, in newtons?
34. 34.🏋️ A machine lifts a load of 180 N when you push with 60 N. What is its mechanical advantage (MA)?
35. 35.⚖️ A seesaw balances. Arjun (? N) sits 4 m from the pivot on one side; Zoya (560 N) sits 2 m from the pivot on the other side. What is the missing weight in newtons?
36. 36.🪝 Fixed or movable pulley: which one halves the effort? (a) a fixed pulley (b) a movable pulley
37. 37.⚖️ Along a straight bar, measured from the left end, the effort is at 30 cm, the fulcrum at 80 cm and the load at 70 cm. Which class of lever is it? (a) class 1 (b) class 2 (c) class 3
38. 38.⚖️ Along a straight bar, measured from the left end, the effort is at 60 cm, the fulcrum at 10 cm and the load at 30 cm. Which class of lever is it? (a) class 1 (b) class 2 (c) class 3
39. 39.💪 A cart is pulled to the right with 75 N and to the left with 80 N. Which way does the net force act? (a) no net force (b) to the left (c) to the right
40. 40.⚖️ A lever balances when … (a) both weights are equal (b) the bar is short (c) the fulcrum moves (d) turning effects match

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