Engineering Worksheet: Part 2 Test

Engineering lesson 16: Part 2 test: forces and machines · Set 520 · 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.💪 In which unit do we measure force? (a) metre (m) (b) second (s) (c) litre (L) (d) newton (N)
2. 2.🏋️ A force of 80 N did 240 J of work. How many metres did the object move?
3. 3.🪝 A pulley system lifts a 300 N load with an effort of 150 N. What is its mechanical advantage (MA)?
4. 4.⚖️ A seesaw balances. Zoya (? N) sits 4 m from the pivot on one side; Kabir (640 N) sits 4 m from the pivot on the other side. What is the missing weight in newtons?
5. 5.True or false: a grippy rubber sole gives more friction. (a) True (b) False
6. 6.💪 Which force pulls everything towards the Earth? (a) friction (b) magnetism (c) gravity (d) wind
7. 7.🛞 More or less friction: sand on a slippery path? (a) more friction (b) less friction
8. 8.⚖️ A lever bar balances. The load is 240 N at 40 cm from the fulcrum. The effort is ? N at 60 cm from the fulcrum on the other side. What is the missing force in newtons?
9. 9.⚖️ Which class of lever is a wheelbarrow? (a) class 3 (b) class 2 (c) class 1
10. 10.🪝 Fixed or movable pulley: which one rises with the load? (a) a fixed pulley (b) a movable pulley
11. 11.⚖️ A seesaw balances. Asha (150 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?
12. 12.True or false: a tyre with deep treads gives more friction. (a) False (b) True
13. 13.🔍 Which is the odd one out? (a) a wet tiled floor (b) powder on a carrom board (c) a grippy rubber sole (d) skating on ice
14. 14.🛞 More or less friction: a wet tiled floor? (a) more friction (b) less friction
15. 15.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 9 N, a carpet 13 N, ice 2 N, a glass sheet 6 N. How many newtons more were needed on a carpet than on ice?
16. 16.🏋️ A force of 410 N pushes a cart 10 m along the floor. How much work is done, in joules?
17. 17.🪝 A bucket weighing 370 N is lifted with a single fixed pulley at the top of a well. What effort is needed, in newtons? (ideal pulley, no friction)
18. 18.True or false: a pair of kitchen tongs is a class 2 lever (load in the middle). (a) True (b) False
19. 19.💪 Is pushing a swing a push or a pull? (a) a push (b) a pull
20. 20.⚖️ Along a straight bar, measured from the left end, the effort is at 50 cm, the fulcrum at 30 cm and the load at 70 cm. Which class of lever is it? (a) class 2 (b) class 3 (c) class 1
21. 21.🪝 A winch has a wheel of radius 3 cm and an axle of radius 1 cm. What effort on the wheel lifts a 300 N bucket on the axle, in newtons? (ideal)
22. 22.True or false: a wheelchair ramp is a lever. (a) False (b) True
23. 23.🏋️ A machine lifts a load of 420 N when you push with 70 N. What is its mechanical advantage (MA)?
24. 24.⚖️ A seesaw balances. Asha (260 N) sits 2 m from the pivot on one side; Kabir (260 N) sits ? m from the pivot on the other side. What is the missing distance in metres?
25. 25.True or false: a movable pulley makes you pull 2× rope. (a) True (b) False
26. 26.🏋️ A force of 420 N pushes a cart 5 m along the floor. How much work is done, in joules?
27. 27.🏋️ In which unit is work measured? (a) joule (J) (b) newton (N) (c) metre (m) (d) watt hour
28. 28.⚙️ Most simple machines make work easier by letting us … (a) use a smaller force (b) make new energy (c) switch off gravity (d) stop all friction
29. 29.True or false: a fishing rod is a class 3 lever (effort in the middle). (a) True (b) False
30. 30.⚖️ A lever balances when … (a) the bar is short (b) turning effects match (c) the fulcrum moves (d) both weights are equal
31. 31.🛞 Which surface gives the MOST friction to a sliding block? (a) polished marble (b) sandpaper (c) ice (d) glass
32. 32.⚖️ A seesaw balances. Meena (120 N) sits 2 m from the pivot on one side; Zoya (240 N) sits ? m from the pivot on the other side. What is the missing distance in metres?
33. 33.⚖️ A seesaw balances. Zoya (200 N) sits 3 m from the pivot on one side; Asha (600 N) sits ? m from the pivot on the other side. What is the missing distance in metres?
34. 34.🏋️ A force of 390 N did 2340 J of work. How many metres did the object move?
35. 35.🪝 A bucket weighing 20 N is lifted with a single fixed pulley at the top of a well. What effort is needed, in newtons? (ideal pulley, no friction)
36. 36.⚖️ Along a straight bar, measured from the left end, the effort is at 20 cm, the fulcrum at 10 cm and the load at 60 cm. Which class of lever is it? (a) class 3 (b) class 2 (c) class 1
37. 37.🛞 More or less friction: skating on ice? (a) less friction (b) more friction
38. 38.⚖️ Which class of lever is a broom when sweeping? (a) class 2 (b) class 3 (c) class 1
39. 39.True or false: a fixed pulley hangs on the rope loop. (a) False (b) True
40. 40.💪 Two children push a box to the right, one with 60 N and the other with 85 N. What is the net (total) force on the box, in newtons?

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