Engineering Worksheet: Part 2 Test

Engineering lesson 16: Part 2 test: forces and machines · Set 418 · 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 40 cm, the fulcrum at 0 cm and the load at 30 cm. Which class of lever is it? (a) class 1 (b) class 3 (c) class 2
2. 2.⚖️ A lever bar balances. The load is ? N at 50 cm from the fulcrum. The effort is 50 N at 100 cm from the fulcrum on the other side. What is the missing force in newtons?
3. 3.🛞 Is friction helpful or a problem here: writing with a pencil? (a) a problem (b) helpful
4. 4.True or false: powder on a carrom board gives less friction. (a) False (b) True
5. 5.True or false: a seesaw is a lever. (a) True (b) False
6. 6.⚙️ Which simple machine is a crane hook block? (a) wheel and axle (b) pulley (c) inclined plane (d) screw
7. 7.🪝 A load of 270 N hangs from a pulley system in which 3 rope sections hold up the load. What effort is needed, in newtons? (ideal pulleys)
8. 8.⚙️ Which simple machine is a bottle opener? (a) screw (b) inclined plane (c) lever (d) pulley
9. 9.⚙️ Which simple machine is a claw hammer on a nail? (a) pulley (b) screw (c) lever (d) wheel and axle
10. 10.🪝 A bucket weighing 270 N is lifted with a single fixed pulley at the top of a well. What effort is needed, in newtons? (ideal pulley, no friction)
11. 11.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 5 N, a carpet 9 N, sandpaper 12 N, ice 4 N. Which surface gave the least friction? (a) sandpaper (b) a wooden plank (c) a carpet (d) ice
12. 12.⚖️ Along a straight bar, measured from the left end, the effort is at 30 cm, the fulcrum at 50 cm and the load at 10 cm. Which class of lever is it? (a) class 1 (b) class 2 (c) class 3
13. 13.⚖️ A seesaw balances. Asha (360 N) sits ? m from the pivot on one side; Meena (180 N) sits 2 m from the pivot on the other side. What is the missing distance in metres?
14. 14.🪝 A load of 500 N hangs from a pulley system in which 2 rope sections hold up the load. What effort is needed, in newtons? (ideal pulleys)
15. 15.💪 Which force is at work: pedalling a cycle? (a) gravity (b) magnetic force (c) friction (d) muscular force
16. 16.💪 Is plucking a mango a push or a pull? (a) a pull (b) a push
17. 17.💪 Which force is at work: rubbing hands warms them? (a) magnetic force (b) gravity (c) muscular force (d) friction
18. 18.💪 A bag has a mass of 40 kg. Taking 1 kg to weigh about 10 N, what is its weight in newtons?
19. 19.True or false: drawing up a well bucket is a pull. (a) False (b) True
20. 20.True or false: the tip of a nail is a wheel and axle. (a) False (b) True
21. 21.🏋️ Mechanical advantage (MA) = … (a) load × effort (b) load + effort (c) effort ÷ load (d) load ÷ effort
22. 22.⚖️ A lever bar balances. The load is 400 N at 30 cm from the fulcrum. The effort is ? N at 50 cm from the fulcrum on the other side. What is the missing force in newtons?
23. 23.💪 Which force is at work: a fridge magnet sticks? (a) friction (b) magnetic force (c) muscular force (d) gravity
24. 24.True or false: a box pushed on carpet gives less friction. (a) True (b) False
25. 25.🏋️ A 7 kg box is lifted straight up by 5 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
26. 26.🔍 Which is the odd one out? (a) a crane hook block (b) a window blind cord (c) a flagpole rope wheel (d) a knife edge
27. 27.💪 A bag has a mass of 43 kg. Taking 1 kg to weigh about 10 N, what is its weight in newtons?
28. 28.True or false: a pair of pliers is a class 1 lever (fulcrum in the middle). (a) False (b) True
29. 29.🪝 A load of 520 N hangs from a pulley system in which 2 rope sections hold up the load. What effort is needed, in newtons? (ideal pulleys)
30. 30.🪝 What does a single fixed pulley change? (a) the size of the load (b) the colour of rope (c) gravity (d) the direction of pull
31. 31.⚖️ Which class of lever is a fishing rod? (a) class 2 (b) class 1 (c) class 3
32. 32.⚖️ A lever bar balances. The load is 140 N at 20 cm from the fulcrum. The effort is ? N at 20 cm from the fulcrum on the other side. What is the missing force in newtons?
33. 33.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 9 N, sandpaper 13 N, ice 3 N, a glass sheet 5 N. Which surface gave the most friction? (a) sandpaper (b) a glass sheet (c) a carpet (d) ice
34. 34.🛞 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 6 N, sandpaper 8 N. Which surface gave the least friction? (a) a wooden plank (b) sandpaper (c) a glass sheet (d) ice
35. 35.True or false: a rough doormat gives more friction. (a) True (b) False
36. 36.💪 A cart is pulled to the right with 55 N and to the left with 55 N. Which way does the net force act? (a) no net force (b) to the left (c) to the right
37. 37.⚖️ Along a straight bar, measured from the left end, the effort is at 30 cm, the fulcrum at 0 cm and the load at 10 cm. Which class of lever is it? (a) class 1 (b) class 3 (c) class 2
38. 38.⚖️ A lever balances when … (a) the fulcrum moves (b) both weights are equal (c) turning effects match (d) the bar is short
39. 39.⚖️ A seesaw balances. Meena (200 N) sits 2 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?
40. 40.🪝 A pulley system lifts a 360 N load with an effort of 90 N. What is its mechanical advantage (MA)?

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