Engineering Worksheet: Part 2 Test

Engineering lesson 16: Part 2 test: forces and machines · Set 715 · 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 pulley system lifts a 450 N load with an effort of 150 N. What is its mechanical advantage (MA)?
2. 2.Which of these is caused by gravity? (a) rubbing hands warms them (b) an apple falls down (c) lifting a school bag (d) a rolling ball slows
3. 3.🏋️ A force of 20 N did 100 J of work. How many metres did the object move?
4. 4.🛞 More or less friction: a grippy rubber sole? (a) less friction (b) more friction
5. 5.⚖️ A lever balances when … (a) the bar is short (b) turning effects match (c) the fulcrum moves (d) both weights are equal
6. 6.Which of these is caused by magnetic force? (a) a thrown ball comes down (b) rain falls to the ground (c) a rolling ball slows (d) a fridge magnet sticks
7. 7.🪝 A winch has a wheel of radius 8 cm and an axle of radius 2 cm. What effort on the wheel lifts an 800 N bucket on the axle, in newtons? (ideal)
8. 8.⚖️ Which class of lever is a pair of kitchen tongs? (a) class 1 (b) class 3 (c) class 2
9. 9.⚖️ Going along a lever from one end to the other, the order is: effort, fulcrum, load. Which class of lever is it? (a) class 2 (b) class 3 (c) class 1
10. 10.💪 Is drawing up a well bucket a push or a pull? (a) a pull (b) a push
11. 11.🪝 A wheel and axle is a big wheel fixed to … (a) a sharp wedge (b) a smaller rod (axle) (c) a flat ramp (d) a loose rope
12. 12.🪝 A pulley system lifts a 260 N load with an effort of 130 N. What is its mechanical advantage (MA)?
13. 13.Which of these is a screw? (a) a nut and bolt (b) an axe blade (c) a water tap handle (d) a chisel
14. 14.⚖️ A seesaw balances. Meena (120 N) sits ? m from the pivot on one side; Zoya (360 N) sits 1 m from the pivot on the other side. What is the missing distance in metres?
15. 15.⚖️ A lever bar balances. The load is 630 N at 50 cm from the fulcrum. The effort is 350 N at ? cm from the fulcrum on the other side. What is the missing distance in centimetres?
16. 16.⚖️ A seesaw balances. Ravi (280 N) sits 1 m from the pivot on one side; Meena (? N) sits 2 m from the pivot on the other side. What is the missing weight in newtons?
17. 17.⚖️ A lever bar balances. The load is 200 N at 40 cm from the fulcrum. The effort is 160 N at ? cm from the fulcrum on the other side. What is the missing distance in centimetres?
18. 18.True or false: a movable pulley needs effort = load. (a) False (b) True
19. 19.🪝 A bucket weighing 360 N is lifted with a single fixed pulley at the top of a well. What effort is needed, in newtons? (ideal pulley, no friction)
20. 20.🔍 Which is the odd one out? (a) powder on a carrom board (b) skating on ice (c) a box pushed on carpet (d) a wet tiled floor
21. 21.⚖️ A lever bar balances. The load is 280 N at 30 cm from the fulcrum. The effort is 210 N at ? cm from the fulcrum on the other side. What is the missing distance in centimetres?
22. 22.🏋️ Pushing a crate 3 m took 1230 J of work. What force was used, in newtons?
23. 23.🪝 More rope sections holding a load means … (a) no change (b) the load floats (c) less effort needed (d) more effort needed
24. 24.⚖️ A seesaw balances. Arjun (480 N) sits ? m from the pivot on one side; Kabir (240 N) sits 4 m from the pivot on the other side. What is the missing distance in metres?
25. 25.⚙️ Most simple machines make work easier by letting us … (a) switch off gravity (b) make new energy (c) stop all friction (d) use a smaller force
26. 26.💪 In a tug of war, one team pulls right with 30 N and the other pulls left with 15 N. What is the size of the net force, in newtons?
27. 27.🏋️ Can a simple machine reduce the work done? (a) yes, by half (b) only on Mondays (c) yes, always (d) no, work stays the same
28. 28.🏋️ A 14 kg box is lifted straight up by 1 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
29. 29.🔍 Which is the odd one out? (a) a window blind cord (b) a flagpole rope wheel (c) a round doorknob (d) a well-bucket rope wheel
30. 30.🏋️ A machine lifts a load of 60 N when you push with 30 N. What is its mechanical advantage (MA)?
31. 31.⚖️ A seesaw balances. Zoya (450 N) sits ? m from the pivot on one side; Ravi (150 N) sits 3 m from the pivot on the other side. What is the missing distance in metres?
32. 32.⚖️ A lever bar balances. The load is 100 N at 20 cm from the fulcrum. The effort is ? N at 100 cm from the fulcrum on the other side. What is the missing force in newtons?
33. 33.True or false: a rough doormat gives less friction. (a) True (b) False
34. 34.⚖️ Along a straight bar, measured from the left end, the effort is at 20 cm, the fulcrum at 40 cm and the load at 80 cm. Which class of lever is it? (a) class 3 (b) class 1 (c) class 2
35. 35.True or false: a movable pulley halves the effort. (a) False (b) True
36. 36.True or false: kicking a football is a push. (a) True (b) False
37. 37.🔍 Which is the odd one out? (a) skating on ice (b) a wet tiled floor (c) a wheel on ball bearings (d) a tyre with deep treads
38. 38.Which of these is caused by friction? (a) rubbing hands warms them (b) a river flows downhill (c) a fridge magnet sticks (d) an apple falls down
39. 39.🛞 More or less friction: a box pushed on carpet? (a) more friction (b) less friction
40. 40.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 1 N, a wooden plank 3 N, a carpet 7 N, sandpaper 11 N. Which surface gave the least friction? (a) a wooden plank (b) sandpaper (c) a glass sheet (d) a carpet

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