Engineering Worksheet: Part 2 Test

Engineering lesson 16: Part 2 test: forces and machines · Set 279 · 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 lever bar balances. The load is ? N at 20 cm from the fulcrum. The effort is 40 N at 100 cm from the fulcrum on the other side. What is the missing force in newtons?
2. 2.🏋️ Mechanical advantage (MA) = … (a) effort ÷ load (b) load × effort (c) load + effort (d) load ÷ effort
3. 3.💪 Two children push a box to the right, one with 95 N and the other with 20 N. What is the net (total) force on the box, in newtons?
4. 4.⚖️ A lever bar balances. The load is 90 N at ? cm from the fulcrum. The effort is 60 N at 30 cm from the fulcrum on the other side. What is the missing distance in centimetres?
5. 5.Which of these is caused by friction? (a) a thrown ball comes down (b) rain falls to the ground (c) a rolling ball slows (d) an apple falls down
6. 6.Which of these is caused by gravity? (a) brakes stop a bicycle (b) pedalling a cycle (c) a thrown ball comes down (d) shoes grip the floor
7. 7.🪝 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?
8. 8.🪝 A winch has a wheel of radius 6 cm and an axle of radius 2 cm. What effort on the wheel lifts a 120 N bucket on the axle, in newtons? (ideal)
9. 9.⚖️ A seesaw balances. Meena (160 N) sits ? m from the pivot on one side; Asha (480 N) sits 1 m from the pivot on the other side. What is the missing distance in metres?
10. 10.💪 Is plucking a mango a push or a pull? (a) a pull (b) a push
11. 11.True or false: a fixed pulley only changes direction. (a) True (b) False
12. 12.True or false: a pair of kitchen tongs is a class 1 lever (fulcrum in the middle). (a) False (b) True
13. 13.🏋️ Pushing a crate 1 m took 430 J of work. What force was used, in newtons?
14. 14.🛞 Rubbing your hands fast makes them … (a) warm (b) magnetic (c) cold (d) wet
15. 15.True or false: a wet tiled floor gives less friction. (a) False (b) True
16. 16.🔍 Which is the odd one out? (a) a knife edge (b) an axe blade (c) a chisel (d) a bottle cap
17. 17.⚖️ Turning effect = force × … (a) mass of fulcrum (b) distance from fulcrum (c) time taken (d) colour of bar
18. 18.⚖️ A seesaw balances. Meena (190 N) sits 4 m from the pivot on one side; Arjun (760 N) sits ? m from the pivot on the other side. What is the missing distance in metres?
19. 19.🪝 A well winch has a handle (wheel) of radius 12 cm turning an axle of radius 4 cm. What is its mechanical advantage (MA)?
20. 20.🪝 More rope sections holding a load means … (a) less effort needed (b) no change (c) more effort needed (d) the load floats
21. 21.True or false: sand on a slippery path gives less friction. (a) True (b) False
22. 22.💪 Two equal forces push on a box from opposite sides. They are … (a) gravity (b) balanced (c) doubled (d) unbalanced
23. 23.⚖️ Along a straight bar, measured from the left end, the effort is at 80 cm, the fulcrum at 20 cm and the load at 60 cm. Which class of lever is it? (a) class 2 (b) class 1 (c) class 3
24. 24.True or false: drawing up a well bucket is a push. (a) True (b) False
25. 25.True or false: a pair of scissors is a class 3 lever (effort in the middle). (a) True (b) False
26. 26.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 7 N, sandpaper 10 N, ice 3 N, a glass sheet 5 N. How many newtons more were needed on sandpaper than on ice?
27. 27.⚖️ A seesaw balances. Kabir (? N) sits 4 m from the pivot on one side; Meena (600 N) sits 4 m from the pivot on the other side. What is the missing weight in newtons?
28. 28.True or false: a movable pulley hangs on the rope loop. (a) False (b) True
29. 29.⚖️ A lever balances when … (a) the fulcrum moves (b) the bar is short (c) turning effects match (d) both weights are equal
30. 30.🪝 A wheel and axle is a big wheel fixed to … (a) a flat ramp (b) a loose rope (c) a sharp wedge (d) a smaller rod (axle)
31. 31.⚖️ A seesaw balances. Arjun (420 N) sits 4 m from the pivot on one side; Meena (560 N) sits ? m from the pivot on the other side. What is the missing distance in metres?
32. 32.🏋️ A 10 kg box is lifted straight up by 1 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
33. 33.💪 A cart is pulled to the right with 25 N and to the left with 25 N. Which way does the net force act? (a) to the right (b) to the left (c) no net force
34. 34.🏋️ A machine lifts a load of 720 N when you push with 120 N. What is its mechanical advantage (MA)?
35. 35.⚖️ A seesaw balances. Asha (180 N) sits 1 m from the pivot on one side; Meena (? N) sits 1 m from the pivot on the other side. What is the missing weight in newtons?
36. 36.⚖️ A seesaw balances. Asha (? N) sits 1 m from the pivot on one side; Meena (120 N) sits 4 m from the pivot on the other side. What is the missing weight in newtons?
37. 37.🪝 Fixed or movable pulley: which one stays in one place? (a) a movable pulley (b) a fixed pulley
38. 38.🏋️ A 17 kg box is lifted straight up by 3 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
39. 39.⚙️ Which simple machine is a well-bucket rope wheel? (a) lever (b) inclined plane (c) pulley (d) wheel and axle
40. 40.Which of these is caused by muscular force? (a) lifting a school bag (b) a rolling ball slows (c) rain falls to the ground (d) rubbing hands warms them

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