Engineering Worksheet: Part 2 Test

Engineering lesson 16: Part 2 test: forces and machines · Set 379 · 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.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 9 N, a glass sheet 2 N, a wooden plank 5 N, a carpet 7 N. Which surface gave the least friction? (a) sandpaper (b) a wooden plank (c) a glass sheet (d) a carpet
2. 2.⚖️ Going along a lever from one end to the other, the order is: load, effort, fulcrum. Which class of lever is it? (a) class 2 (b) class 1 (c) class 3
3. 3.⚙️ Which simple machine is a water tap handle? (a) screw (b) lever (c) wedge (d) wheel and axle
4. 4.⚖️ Which class of lever is a beam balance? (a) class 2 (b) class 1 (c) class 3
5. 5.💪 Which force is at work: pedalling a cycle? (a) muscular force (b) gravity (c) magnetic force (d) friction
6. 6.⚙️ A wedge is … (a) two ramps back to back (b) a wheel on a rod (c) a rope on a wheel (d) a bar on a pivot
7. 7.⚖️ A lever bar balances. The load is 350 N at 10 cm from the fulcrum. The effort is 70 N at ? cm from the fulcrum on the other side. What is the missing distance in centimetres?
8. 8.True or false: skating on ice gives less friction. (a) True (b) False
9. 9.🛞 More or less friction: a rough doormat? (a) more friction (b) less friction
10. 10.True or false: pressing a doorbell is a pull. (a) True (b) False
11. 11.⚖️ Along a straight bar, measured from the left end, the effort is at 60 cm, the fulcrum at 30 cm and the load at 80 cm. Which class of lever is it? (a) class 2 (b) class 1 (c) class 3
12. 12.🪝 A bucket weighing 330 N is lifted with a single fixed pulley at the top of a well. What effort is needed, in newtons? (ideal pulley, no friction)
13. 13.True or false: a fixed pulley is on a flagpole top. (a) False (b) True
14. 14.⚖️ A seesaw balances. Zoya (600 N) sits 2 m from the pivot on one side; Arjun (? N) sits 3 m from the pivot on the other side. What is the missing weight in newtons?
15. 15.🪝 A pulley system lifts a 100 N load with an effort of 50 N. What is its mechanical advantage (MA)?
16. 16.⚖️ A lever bar balances. The load is 40 N at 30 cm from the fulcrum. The effort is 60 N at ? cm from the fulcrum on the other side. What is the missing distance in centimetres?
17. 17.True or false: a movable pulley makes you pull 2× rope. (a) True (b) False
18. 18.True or false: a knife edge is a wedge. (a) True (b) False
19. 19.⚖️ A seesaw balances. Asha (? N) sits 3 m from the pivot on one side; Ravi (510 N) sits 3 m from the pivot on the other side. What is the missing weight in newtons?
20. 20.🏋️ A 10 kg box is lifted straight up by 4 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
21. 21.True or false: a box pushed on carpet gives less friction. (a) False (b) True
22. 22.💪 A bag has a mass of 50 kg. Taking 1 kg to weigh about 10 N, what is its weight in newtons?
23. 23.True or false: a well-bucket rope wheel is a pulley. (a) False (b) True
24. 24.⚖️ A seesaw balances. Meena (180 N) sits ? m from the pivot on one side; Arjun (360 N) sits 1 m from the pivot on the other side. What is the missing distance in metres?
25. 25.⚙️ Which simple machine is a screw jack? (a) pulley (b) inclined plane (c) lever (d) screw
26. 26.🪝 A wheel and axle is a big wheel fixed to … (a) a loose rope (b) a flat ramp (c) a sharp wedge (d) a smaller rod (axle)
27. 27.🏋️ A smooth ramp is 8 m long and rises 2 m. What effort pushes a 1800 N box up it, in newtons? (ideal ramp, no friction)
28. 28.⚖️ A seesaw balances. Meena (120 N) sits ? m from the pivot on one side; Asha (360 N) sits 1 m from the pivot on the other side. What is the missing distance in metres?
29. 29.⚖️ 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 3 (c) class 2
30. 30.Which of these is caused by muscular force? (a) a fridge magnet sticks (b) a rolling ball slows (c) pedalling a cycle (d) shoes grip the floor
31. 31.⚖️ Which class of lever is a pair of kitchen tongs? (a) class 3 (b) class 1 (c) class 2
32. 32.⚙️ Most simple machines make work easier by letting us … (a) make new energy (b) stop all friction (c) switch off gravity (d) use a smaller force
33. 33.True or false: sand on a slippery path gives less friction. (a) False (b) True
34. 34.🏋️ A force of 400 N pushes a cart 10 m along the floor. How much work is done, in joules?
35. 35.⚖️ To lift a heavy rock with a crowbar more easily, push … (a) on the fulcrum (b) on the rock (c) far from the fulcrum (d) near the fulcrum
36. 36.🔍 Which is the odd one out? (a) a box pushed on carpet (b) a rough doormat (c) sand on a slippery path (d) oil on a squeaky hinge
37. 37.⚖️ Which class of lever is a wheelbarrow? (a) class 3 (b) class 1 (c) class 2
38. 38.⚖️ Which class of lever is a crowbar? (a) class 1 (b) class 3 (c) class 2
39. 39.⚖️ Along a straight bar, measured from the left end, the effort is at 20 cm, the fulcrum at 30 cm and the load at 0 cm. Which class of lever is it? (a) class 3 (b) class 2 (c) class 1
40. 40.True or false: a fixed pulley rises with the load. (a) False (b) True

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