Engineering Worksheet: Part 2 Test

Engineering lesson 16: Part 2 test: forces and machines · Set 674 · 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.True or false: a wet tiled floor gives more friction. (a) True (b) False
2. 2.⚖️ A lever bar balances. The load is 100 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?
3. 3.🔍 Which is the odd one out? (a) a smooth steel slide (b) chalk on a gym bar (c) a wet tiled floor (d) oil on a squeaky hinge
4. 4.💪 A cart is pulled to the right with 65 N and to the left with 70 N. Which way does the net force act? (a) to the right (b) to the left (c) no net force
5. 5.💪 Which force is at work: a magnet picks up pins? (a) friction (b) magnetic force (c) muscular force (d) gravity
6. 6.⚖️ A seesaw balances. Arjun (110 N) sits 4 m from the pivot on one side; Kabir (? N) sits 1 m from the pivot on the other side. What is the missing weight in newtons?
7. 7.🪝 A pulley system lifts a 450 N load with an effort of 150 N. What is its mechanical advantage (MA)?
8. 8.⚖️ A lever bar balances. The load is ? N at 40 cm from the fulcrum. The effort is 160 N at 30 cm from the fulcrum on the other side. What is the missing force in newtons?
9. 9.Which of these is caused by gravity? (a) a rolling ball slows (b) squeezing a lemon (c) a magnet picks up pins (d) a river flows downhill
10. 10.🔍 Which is the odd one out? (a) powder on a carrom board (b) chalk on a gym bar (c) a rough doormat (d) a box pushed on carpet
11. 11.⚙️ How many simple machines are there in the usual list? (a) 3 (b) 12 (c) 10 (d) 6
12. 12.⚖️ A seesaw balances. Ravi (260 N) sits ? m from the pivot on one side; Asha (130 N) sits 2 m from the pivot on the other side. What is the missing distance in metres?
13. 13.💪 Which force pulls everything towards the Earth? (a) friction (b) gravity (c) magnetism (d) wind
14. 14.🛞 Is friction helpful or a problem here: dragging a heavy box? (a) helpful (b) a problem
15. 15.💪 Two children push a box to the right, one with 40 N and the other with 50 N. What is the net (total) force on the box, in newtons?
16. 16.💪 A bag has a mass of 12 kg. Taking 1 kg to weigh about 10 N, what is its weight in newtons?
17. 17.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 8 N, sandpaper 11 N, ice 4 N, a glass sheet 5 N. Which surface gave the most friction? (a) ice (b) a glass sheet (c) sandpaper (d) a wooden plank
18. 18.True or false: a pair of kitchen tongs is a class 1 lever (fulcrum in the middle). (a) False (b) True
19. 19.⚖️ A seesaw balances. Arjun (? N) sits 1 m from the pivot on one side; Meena (110 N) sits 4 m from the pivot on the other side. What is the missing weight in newtons?
20. 20.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 6 N, a carpet 9 N, sandpaper 13 N, ice 3 N. How many newtons more were needed on sandpaper than on ice?
21. 21.Which of these is caused by muscular force? (a) a thrown ball comes down (b) lifting a school bag (c) a compass needle turns (d) shoes grip the floor
22. 22.🪝 Fixed or movable pulley: which one stays in one place? (a) a fixed pulley (b) a movable pulley
23. 23.True or false: a tyre with deep treads gives less friction. (a) True (b) False
24. 24.🏋️ A force of 160 N pushes a cart 10 m along the floor. How much work is done, in joules?
25. 25.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 7 N, sandpaper 11 N, ice 1 N, a wooden plank 3 N. Which surface gave the most friction? (a) sandpaper (b) a wooden plank (c) ice (d) a carpet
26. 26.⚖️ Along a straight bar, measured from the left end, the effort is at 60 cm, the fulcrum at 50 cm and the load at 20 cm. Which class of lever is it? (a) class 3 (b) class 2 (c) class 1
27. 27.⚖️ Along a straight bar, measured from the left end, the effort is at 60 cm, the fulcrum at 30 cm and the load at 40 cm. Which class of lever is it? (a) class 2 (b) class 3 (c) class 1
28. 28.🏋️ A force of 30 N pushes a cart 3 m along the floor. How much work is done, in joules?
29. 29.🔍 Which is the odd one out? (a) a wet tiled floor (b) skating on ice (c) a rough doormat (d) powder on a carrom board
30. 30.🏋️ A force of 80 N pushes a cart 6 m along the floor. How much work is done, in joules?
31. 31.🪝 Fixed or movable pulley: which one is on a flagpole top? (a) a fixed pulley (b) a movable pulley
32. 32.🪝 A bucket weighing 420 N is lifted with a single fixed pulley at the top of a well. What effort is needed, in newtons? (ideal pulley, no friction)
33. 33.🏋️ A machine lifts a load of 540 N when you push with 180 N. What is its mechanical advantage (MA)?
34. 34.⚖️ Going along a lever from one end to the other, the order is: effort, load, fulcrum. Which class of lever is it? (a) class 3 (b) class 2 (c) class 1
35. 35.⚖️ Which class of lever is a pair of tweezers? (a) class 2 (b) class 3 (c) class 1
36. 36.🪝 A bucket weighing 390 N is lifted with a single fixed pulley at the top of a well. What effort is needed, in newtons? (ideal pulley, no friction)
37. 37.⚖️ Along a straight bar, measured from the left end, the effort is at 30 cm, the fulcrum at 50 cm and the load at 90 cm. Which class of lever is it? (a) class 1 (b) class 2 (c) class 3
38. 38.True or false: a fixed pulley is on a flagpole top. (a) False (b) True
39. 39.⚖️ A seesaw balances. Zoya (800 N) sits 4 m from the pivot on one side; Ravi (800 N) sits ? m from the pivot on the other side. What is the missing distance in metres?
40. 40.🏋️ Mechanical advantage (MA) = … (a) load + effort (b) load ÷ effort (c) effort ÷ load (d) load × effort

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