Engineering Worksheet: Part 2 Test

Engineering lesson 16: Part 2 test: forces and machines · Set 585 · 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: ice 4 N, a glass sheet 5 N, a carpet 6 N, sandpaper 9 N. How many newtons more were needed on sandpaper than on ice?
2. 2.True or false: a claw hammer on a nail is a pulley. (a) False (b) True
3. 3.⚖️ A seesaw balances. Kabir (220 N) sits ? m from the pivot on one side; Zoya (110 N) sits 2 m from the pivot on the other side. What is the missing distance in metres?
4. 4.⚙️ Which simple machine is a claw hammer on a nail? (a) pulley (b) inclined plane (c) wedge (d) lever
5. 5.True or false: pressing a doorbell is a pull. (a) True (b) False
6. 6.⚖️ A lever bar balances. The load is 60 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?
7. 7.True or false: a tug of war is a push. (a) True (b) False
8. 8.⚖️ A seesaw balances. Meena (280 N) sits 2 m from the pivot on one side; Kabir (280 N) sits ? m from the pivot on the other side. What is the missing distance in metres?
9. 9.⚖️ On a seesaw, a heavier child should sit … (a) on the pivot (b) closer to the pivot (c) anywhere (d) farther from the pivot
10. 10.🪝 A pulley system has 2 rope sections holding up the load. To lift the load by 3 m, how many metres of rope must you pull?
11. 11.⚖️ Which class of lever is a pair of kitchen tongs? (a) class 1 (b) class 3 (c) class 2
12. 12.True or false: a movable pulley halves the effort. (a) False (b) True
13. 13.🪝 A load of 400 N hangs from a pulley system in which 4 rope sections hold up the load. What effort is needed, in newtons? (ideal pulleys)
14. 14.🏋️ A force of 80 N pushes a cart 5 m along the floor. How much work is done, in joules?
15. 15.⚖️ Along a straight bar, measured from the left end, the effort is at 0 cm, the fulcrum at 40 cm and the load at 10 cm. Which class of lever is it? (a) class 3 (b) class 1 (c) class 2
16. 16.🛞 How can we reduce friction in a machine? (a) oil the moving parts (b) make parts rough (c) press parts harder (d) add sand
17. 17.Which of these is caused by gravity? (a) a fridge magnet sticks (b) a compass needle turns (c) brakes stop a bicycle (d) an apple falls down
18. 18.🏋️ A force of 320 N pushes a cart 3 m along the floor. How much work is done, in joules?
19. 19.⚙️ Which simple machine is an axe blade? (a) screw (b) wedge (c) inclined plane (d) pulley
20. 20.True or false: a fixed pulley rises with the load. (a) True (b) False
21. 21.💪 Which force is at work: an apple falls down? (a) friction (b) magnetic force (c) gravity (d) muscular force
22. 22.🏋️ A machine lifts a load of 950 N when you push with 190 N. What is its mechanical advantage (MA)?
23. 23.🏋️ An 8 kg box is lifted straight up by 1 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
24. 24.💪 Which force is at work: rain falls to the ground? (a) gravity (b) friction (c) magnetic force (d) muscular force
25. 25.🪝 A wheel and axle is a big wheel fixed to … (a) a loose rope (b) a flat ramp (c) a smaller rod (axle) (d) a sharp wedge
26. 26.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 5 N, a carpet 8 N, sandpaper 10 N, ice 3 N. Which surface gave the most friction? (a) ice (b) a carpet (c) sandpaper (d) a glass sheet
27. 27.⚖️ A seesaw balances. Ravi (260 N) sits 4 m from the pivot on one side; Arjun (520 N) sits ? m from the pivot on the other side. What is the missing distance in metres?
28. 28.🔍 Which is the odd one out? (a) powder on a carrom board (b) a smooth steel slide (c) a grippy rubber sole (d) oil on a squeaky hinge
29. 29.🔍 Which is the odd one out? (a) powder on a carrom board (b) a smooth steel slide (c) a box pushed on carpet (d) oil on a squeaky hinge
30. 30.🪝 What does a single fixed pulley change? (a) gravity (b) the colour of rope (c) the direction of pull (d) the size of the load
31. 31.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 16 N, ice 4 N, a glass sheet 8 N, a wooden plank 12 N. Which surface gave the most friction? (a) ice (b) a glass sheet (c) a wooden plank (d) sandpaper
32. 32.⚖️ A seesaw balances. Kabir (110 N) sits 4 m from the pivot on one side; Arjun (? N) sits 1 m from the pivot on the other side. What is the missing weight in newtons?
33. 33.🏋️ Pushing a crate 2 m took 280 J of work. What force was used, in newtons?
34. 34.💪 A cart is pulled to the right with 75 N and to the left with 60 N. Which way does the net force act? (a) no net force (b) to the left (c) to the right
35. 35.True or false: a fixed pulley makes you pull 2× rope. (a) True (b) False
36. 36.🪝 A pulley system lifts a 480 N load with an effort of 160 N. What is its mechanical advantage (MA)?
37. 37.🏋️ A 14 kg box is lifted straight up by 5 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
38. 38.🪝 A bucket weighing 150 N is lifted with a single fixed pulley at the top of a well. What effort is needed, in newtons? (ideal pulley, no friction)
39. 39.🪝 Fixed or movable pulley: which one hangs on the rope loop? (a) a movable pulley (b) a fixed pulley
40. 40.💪 Is closing a drawer a push or a pull? (a) a pull (b) a push

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