Engineering Worksheet: Part 2 Test

Engineering lesson 16: Part 2 test: forces and machines · Set 614 · 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 50 cm from the fulcrum. The effort is 500 N at 80 cm from the fulcrum on the other side. What is the missing force in newtons?
2. 2.True or false: a nutcracker is a class 3 lever (effort in the middle). (a) True (b) False
3. 3.True or false: a fishing rod is a class 3 lever (effort in the middle). (a) True (b) False
4. 4.True or false: a tyre with deep treads gives more friction. (a) False (b) True
5. 5.⚖️ To lift a heavy rock with a crowbar more easily, push … (a) far from the fulcrum (b) on the rock (c) on the fulcrum (d) near the fulcrum
6. 6.True or false: a window blind cord is a screw. (a) False (b) True
7. 7.🔍 Which is the odd one out? (a) a smooth steel slide (b) a box pushed on carpet (c) a tyre with deep treads (d) a grippy rubber sole
8. 8.⚖️ Going along a lever from one end to the other, the order is: effort, fulcrum, load. Which class of lever is it? (a) class 3 (b) class 1 (c) class 2
9. 9.⚖️ A lever bar balances. The load is 210 N at 10 cm from the fulcrum. The effort is 30 N at ? cm from the fulcrum on the other side. What is the missing distance in centimetres?
10. 10.🛞 Rubbing your hands fast makes them … (a) magnetic (b) cold (c) wet (d) warm
11. 11.🪝 A bucket weighing 80 N is lifted with a single fixed pulley at the top of a well. What effort is needed, in newtons? (ideal pulley, no friction)
12. 12.💪 Which force is at work: a rolling ball slows? (a) muscular force (b) magnetic force (c) friction (d) gravity
13. 13.🪝 Fixed or movable pulley: which one stays in one place? (a) a fixed pulley (b) a movable pulley
14. 14.🪝 More rope sections holding a load means … (a) more effort needed (b) the load floats (c) no change (d) less effort needed
15. 15.⚖️ A seesaw balances. Meena (200 N) sits 1 m from the pivot on one side; Asha (100 N) sits ? m from the pivot on the other side. What is the missing distance in metres?
16. 16.🛞 More or less friction: skating on ice? (a) more friction (b) less friction
17. 17.⚖️ A seesaw balances. Asha (140 N) sits ? m from the pivot on one side; Zoya (420 N) sits 1 m from the pivot on the other side. What is the missing distance in metres?
18. 18.True or false: hitting a cricket ball is a pull. (a) False (b) True
19. 19.True or false: a fishing rod is a class 1 lever (fulcrum in the middle). (a) False (b) True
20. 20.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 3 N, a glass sheet 7 N, a carpet 8 N, sandpaper 10 N. Which surface gave the least friction? (a) sandpaper (b) ice (c) a carpet (d) a glass sheet
21. 21.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 2 N, a wooden plank 4 N, a carpet 6 N, sandpaper 10 N. How many newtons more were needed on sandpaper than on ice?
22. 22.🔍 Which is the odd one out? (a) a nut and bolt (b) a wood screw (c) a screw jack (d) a well-bucket rope wheel
23. 23.True or false: a fixed pulley stays in one place. (a) True (b) False
24. 24.🏋️ A smooth ramp is 3 m long and rises 1 m. What effort pushes a 3000 N box up it, in newtons? (ideal ramp, no friction)
25. 25.🪝 A pulley system has 3 rope sections holding up the load. To lift the load by 3 m, how many metres of rope must you pull?
26. 26.💪 Which force is at work: a compass needle turns? (a) friction (b) magnetic force (c) muscular force (d) gravity
27. 27.🪝 A pulley system lifts a 760 N load with an effort of 190 N. What is its mechanical advantage (MA)?
28. 28.🛞 Is friction helpful or a problem here: walking without slipping? (a) helpful (b) a problem
29. 29.⚖️ A lever bar balances. The load is 900 N at 10 cm from the fulcrum. The effort is 100 N at ? cm from the fulcrum on the other side. What is the missing distance in centimetres?
30. 30.True or false: a wood screw is a screw. (a) True (b) False
31. 31.True or false: a nutcracker is a class 2 lever (load in the middle). (a) True (b) False
32. 32.Which of these is caused by friction? (a) pedalling a cycle (b) a fridge magnet sticks (c) brakes stop a bicycle (d) a river flows downhill
33. 33.🔍 Which is the odd one out? (a) a smooth steel slide (b) oil on a squeaky hinge (c) powder on a carrom board (d) a grippy rubber sole
34. 34.💪 A cart is pulled to the right with 20 N and to the left with 5 N. Which way does the net force act? (a) no net force (b) to the right (c) to the left
35. 35.⚖️ Which class of lever is a pair of tweezers? (a) class 3 (b) class 2 (c) class 1
36. 36.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 8 N, sandpaper 10 N, ice 3 N, a wooden plank 7 N. Which surface gave the most friction? (a) sandpaper (b) a wooden plank (c) ice (d) a carpet
37. 37.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 2 N, a glass sheet 6 N, a carpet 7 N, sandpaper 11 N. How many newtons more were needed on sandpaper than on ice?
38. 38.⚖️ On a seesaw, a heavier child should sit … (a) on the pivot (b) farther from the pivot (c) closer to the pivot (d) anywhere
39. 39.⚖️ Along a straight bar, measured from the left end, the effort is at 80 cm, the fulcrum at 0 cm and the load at 40 cm. Which class of lever is it? (a) class 2 (b) class 1 (c) class 3
40. 40.⚖️ A lever bar balances. The load is ? N at 30 cm from the fulcrum. The effort is 300 N at 80 cm from the fulcrum on the other side. What is the missing force in newtons?

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