Engineering Worksheet: Part 2 Test

Engineering lesson 16: Part 2 test: forces and machines · Set 133 · 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.⚖️ Along a straight bar, measured from the left end, the effort is at 60 cm, the fulcrum at 70 cm and the load at 30 cm. Which class of lever is it? (a) class 2 (b) class 3 (c) class 1
2. 2.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 1 N, a glass sheet 5 N, a carpet 9 N, sandpaper 10 N. Which surface gave the most friction? (a) sandpaper (b) ice (c) a carpet (d) a glass sheet
3. 3.🪝 A pulley system lifts a 280 N load with an effort of 70 N. What is its mechanical advantage (MA)?
4. 4.True or false: a box pushed on carpet gives more friction. (a) False (b) True
5. 5.True or false: a screw jack is a wedge. (a) True (b) False
6. 6.🏋️ A machine lifts a load of 300 N when you push with 100 N. What is its mechanical advantage (MA)?
7. 7.💪 In which unit do we measure force? (a) second (s) (b) metre (m) (c) newton (N) (d) litre (L)
8. 8.🛞 More or less friction: a box pushed on carpet? (a) more friction (b) less friction
9. 9.💪 Is pressing a doorbell a push or a pull? (a) a pull (b) a push
10. 10.⚖️ Which class of lever is a crowbar? (a) class 1 (b) class 2 (c) class 3
11. 11.🪝 What does a single fixed pulley change? (a) the size of the load (b) gravity (c) the direction of pull (d) the colour of rope
12. 12.⚖️ Going along a lever from one end to the other, the order is: effort, load, fulcrum. Which class of lever is it? (a) class 1 (b) class 3 (c) class 2
13. 13.⚖️ A seesaw balances. Zoya (? N) sits 4 m from the pivot on one side; Kabir (400 N) sits 2 m from the pivot on the other side. What is the missing weight in newtons?
14. 14.🛞 Is friction helpful or a problem here: striking a matchstick? (a) a problem (b) helpful
15. 15.⚖️ Which class of lever is a fishing rod? (a) class 3 (b) class 1 (c) class 2
16. 16.🪝 A wheel and axle is a big wheel fixed to … (a) a loose rope (b) a smaller rod (axle) (c) a sharp wedge (d) a flat ramp
17. 17.True or false: a rough doormat gives more friction. (a) False (b) True
18. 18.💪 Is a tug of war a push or a pull? (a) a pull (b) a push
19. 19.⚙️ Which simple machine is a crowbar? (a) wedge (b) inclined plane (c) screw (d) lever
20. 20.⚖️ A seesaw balances. Zoya (420 N) sits 3 m from the pivot on one side; Arjun (420 N) sits ? m from the pivot on the other side. What is the missing distance in metres?
21. 21.⚖️ Turning effect = force × … (a) mass of fulcrum (b) distance from fulcrum (c) time taken (d) colour of bar
22. 22.⚙️ Which simple machine is a bottle cap? (a) screw (b) pulley (c) wheel and axle (d) lever
23. 23.⚖️ A seesaw balances. Zoya (110 N) sits 4 m from the pivot on one side; Ravi (? N) sits 1 m from the pivot on the other side. What is the missing weight in newtons?
24. 24.⚖️ A lever bar balances. The load is ? N at 10 cm from the fulcrum. The effort is 30 N at 70 cm from the fulcrum on the other side. What is the missing force in newtons?
25. 25.⚖️ A lever bar balances. The load is ? N at 10 cm from the fulcrum. The effort is 10 N at 60 cm from the fulcrum on the other side. What is the missing force in newtons?
26. 26.🪝 A load of 280 N hangs from a pulley system in which 2 rope sections hold up the load. What effort is needed, in newtons? (ideal pulleys)
27. 27.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 4 N, a wooden plank 8 N, a carpet 11 N, sandpaper 13 N. How many newtons more were needed on sandpaper than on ice?
28. 28.🪝 A pulley system has 4 rope sections holding up the load. To lift the load by 8 m, how many metres of rope must you pull?
29. 29.💪 A cart is pulled to the right with 90 N and to the left with 80 N. Which way does the net force act? (a) to the right (b) to the left (c) no net force
30. 30.⚖️ Along a straight bar, measured from the left end, the effort is at 50 cm, the fulcrum at 10 cm and the load at 30 cm. Which class of lever is it? (a) class 2 (b) class 3 (c) class 1
31. 31.💪 Which force pulls everything towards the Earth? (a) friction (b) wind (c) gravity (d) magnetism
32. 32.💪 Which force is at work: a rolling ball slows? (a) gravity (b) magnetic force (c) friction (d) muscular force
33. 33.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 2 N, a wooden plank 4 N, a carpet 8 N, sandpaper 9 N. Which surface gave the most friction? (a) a glass sheet (b) sandpaper (c) a carpet (d) a wooden plank
34. 34.🪝 A bucket weighing 200 N is lifted with a single fixed pulley at the top of a well. What effort is needed, in newtons? (ideal pulley, no friction)
35. 35.💪 Which force is at work: rain falls to the ground? (a) muscular force (b) friction (c) magnetic force (d) gravity
36. 36.Which of these is caused by magnetic force? (a) a magnet picks up pins (b) pedalling a cycle (c) a rolling ball slows (d) squeezing a lemon
37. 37.Which of these is caused by gravity? (a) a fridge magnet sticks (b) rubbing hands warms them (c) a thrown ball comes down (d) a compass needle turns
38. 38.⚖️ A seesaw balances. Meena (360 N) sits ? m from the pivot on one side; Ravi (120 N) sits 3 m from the pivot on the other side. What is the missing distance in metres?
39. 39.True or false: a door stopper is an inclined plane. (a) False (b) True
40. 40.⚖️ A seesaw balances. Kabir (600 N) sits ? m from the pivot on one side; Arjun (200 N) sits 3 m from the pivot on the other side. What is the missing distance in metres?

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