Engineering Worksheet: Part 2 Test

Engineering lesson 16: Part 2 test: forces and machines · Set 176 · 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 wedge is … (a) a bar on a pivot (b) two ramps back to back (c) a wheel on a rod (d) a rope on a wheel
2. 2.⚖️ Along a straight bar, measured from the left end, the effort is at 20 cm, the fulcrum at 80 cm and the load at 60 cm. Which class of lever is it? (a) class 3 (b) class 2 (c) class 1
3. 3.Which of these is caused by friction? (a) a thrown ball comes down (b) a rolling ball slows (c) squeezing a lemon (d) lifting a school bag
4. 4.💪 Is drawing up a well bucket a push or a pull? (a) a push (b) a pull
5. 5.🏋️ A machine lifts a load of 600 N when you push with 100 N. What is its mechanical advantage (MA)?
6. 6.True or false: a pair of kitchen tongs is a class 3 lever (effort in the middle). (a) True (b) False
7. 7.⚙️ Which simple machine is a knife edge? (a) inclined plane (b) wedge (c) lever (d) wheel and axle
8. 8.Which of these is caused by magnetic force? (a) a magnet picks up pins (b) a rolling ball slows (c) pedalling a cycle (d) a thrown ball comes down
9. 9.🔍 Which is the odd one out? (a) a water tap handle (b) a steering wheel (c) a chisel (d) a round doorknob
10. 10.⚙️ Which simple machine is a crowbar? (a) lever (b) inclined plane (c) pulley (d) wheel and axle
11. 11.💪 A cart is pulled to the right with 50 N and to the left with 40 N. Which way does the net force act? (a) to the left (b) to the right (c) no net force
12. 12.💪 Which force is at work: brakes stop a bicycle? (a) muscular force (b) friction (c) gravity (d) magnetic force
13. 13.🏋️ A force of 310 N did 1240 J of work. How many metres did the object move?
14. 14.⚖️ A seesaw balances. Arjun (600 N) sits ? m from the pivot on one side; Kabir (800 N) sits 3 m from the pivot on the other side. What is the missing distance in metres?
15. 15.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 6 N, a carpet 9 N, ice 3 N, a glass sheet 4 N. Which surface gave the least friction? (a) ice (b) a glass sheet (c) a wooden plank (d) a carpet
16. 16.True or false: pushing a swing is a push. (a) True (b) False
17. 17.💪 Which force is at work: a fridge magnet sticks? (a) friction (b) magnetic force (c) gravity (d) muscular force
18. 18.🪝 A load of 600 N hangs from a pulley system in which 4 rope sections hold up the load. What effort is needed, in newtons? (ideal pulleys)
19. 19.⚖️ A lever bar balances. The load is ? N at 30 cm from the fulcrum. The effort is 90 N at 90 cm from the fulcrum on the other side. What is the missing force in newtons?
20. 20.⚖️ Which class of lever is a crowbar? (a) class 1 (b) class 2 (c) class 3
21. 21.⚖️ Along a straight bar, measured from the left end, the effort is at 30 cm, the fulcrum at 40 cm and the load at 70 cm. Which class of lever is it? (a) class 1 (b) class 2 (c) class 3
22. 22.⚖️ To lift a heavy rock with a crowbar more easily, push … (a) far from the fulcrum (b) near the fulcrum (c) on the fulcrum (d) on the rock
23. 23.🪝 A pulley system lifts a 520 N load with an effort of 260 N. What is its mechanical advantage (MA)?
24. 24.🏋️ Mechanical advantage (MA) = … (a) load ÷ effort (b) load + effort (c) load × effort (d) effort ÷ load
25. 25.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 10 N, ice 3 N, a glass sheet 7 N, a carpet 9 N. How many newtons more were needed on sandpaper than on ice?
26. 26.🏋️ A machine lifts a load of 80 N when you push with 40 N. What is its mechanical advantage (MA)?
27. 27.🔍 Which is the odd one out? (a) an axe blade (b) a crane hook block (c) a chisel (d) a knife edge
28. 28.⚖️ A lever balances when … (a) the fulcrum moves (b) the bar is short (c) both weights are equal (d) turning effects match
29. 29.⚖️ A seesaw balances. Kabir (? N) sits 1 m from the pivot on one side; Ravi (120 N) sits 2 m from the pivot on the other side. What is the missing weight in newtons?
30. 30.⚖️ Which class of lever is a pair of scissors? (a) class 3 (b) class 2 (c) class 1
31. 31.🛞 Which surface gives the MOST friction to a sliding block? (a) glass (b) ice (c) sandpaper (d) polished marble
32. 32.🪝 A pulley system has 2 rope sections holding up the load. To lift the load by 4 m, how many metres of rope must you pull?
33. 33.🪝 A bucket weighing 300 N is lifted with a single fixed pulley at the top of a well. What effort is needed, in newtons? (ideal pulley, no friction)
34. 34.🪝 A pulley system lifts a 340 N load with an effort of 170 N. What is its mechanical advantage (MA)?
35. 35.🏋️ A 1 kg box is lifted straight up by 2 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
36. 36.🔍 Which is the odd one out? (a) a wheel on ball bearings (b) a wet tiled floor (c) a smooth steel slide (d) a grippy rubber sole
37. 37.💪 A cart is pulled to the right with 100 N and to the left with 95 N. Which way does the net force act? (a) no net force (b) to the left (c) to the right
38. 38.True or false: a box pushed on carpet gives more friction. (a) False (b) True
39. 39.⚖️ Along a straight bar, measured from the left end, the effort is at 10 cm, the fulcrum at 30 cm and the load at 60 cm. Which class of lever is it? (a) class 1 (b) class 2 (c) class 3
40. 40.⚖️ Going along a lever from one end to the other, the order is: effort, fulcrum, load. Which class of lever is it? (a) class 3 (b) class 1 (c) class 2

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