Engineering Worksheet: Part 2 Test

Engineering lesson 16: Part 2 test: forces and machines · Set 905 · 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 440 N load with an effort of 110 N. What is its mechanical advantage (MA)?
2. 2.🏋️ A force of 310 N did 1860 J of work. How many metres did the object move?
3. 3.💪 A box weighs 60 N. Taking 1 kg to weigh about 10 N, what is its mass in kilograms?
4. 4.🏋️ Pushing a crate 3 m took 1110 J of work. What force was used, in newtons?
5. 5.💪 Two children push a box to the right, one with 95 N and the other with 95 N. What is the net (total) force on the box, in newtons?
6. 6.🛞 How can we reduce friction in a machine? (a) make parts rough (b) add sand (c) press parts harder (d) oil the moving parts
7. 7.⚖️ A lever balances when … (a) the bar is short (b) both weights are equal (c) the fulcrum moves (d) turning effects match
8. 8.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 4 N, a wooden plank 5 N, a carpet 7 N, sandpaper 8 N. Which surface gave the least friction? (a) a carpet (b) a glass sheet (c) sandpaper (d) a wooden plank
9. 9.💪 Which force is at work: squeezing a lemon? (a) magnetic force (b) muscular force (c) friction (d) gravity
10. 10.🏋️ A 16 kg box is lifted straight up by 5 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
11. 11.🔍 Which is the odd one out? (a) powder on a carrom board (b) a wheel on ball bearings (c) skating on ice (d) sand on a slippery path
12. 12.⚙️ A wedge is … (a) a wheel on a rod (b) a rope on a wheel (c) two ramps back to back (d) a bar on a pivot
13. 13.⚖️ Which class of lever is a pair of scissors? (a) class 2 (b) class 3 (c) class 1
14. 14.🏋️ In which unit is work measured? (a) watt hour (b) joule (J) (c) newton (N) (d) metre (m)
15. 15.🪝 A winch has a wheel of radius 20 cm and an axle of radius 4 cm. What effort on the wheel lifts a 300 N bucket on the axle, in newtons? (ideal)
16. 16.⚖️ A seesaw balances. Kabir (? N) sits 2 m from the pivot on one side; Zoya (240 N) sits 4 m from the pivot on the other side. What is the missing weight in newtons?
17. 17.🛞 More or less friction: a wet tiled floor? (a) less friction (b) more friction
18. 18.⚙️ Which simple machine is a crowbar? (a) wedge (b) wheel and axle (c) lever (d) screw
19. 19.🪝 A bucket weighing 60 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 class of lever is a bottle opener? (a) class 3 (b) class 1 (c) class 2
21. 21.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 11 N, ice 3 N, a glass sheet 5 N, a wooden plank 8 N. Which surface gave the least friction? (a) a glass sheet (b) ice (c) a carpet (d) a wooden plank
22. 22.🏋️ A machine lifts a load of 280 N when you push with 140 N. What is its mechanical advantage (MA)?
23. 23.💪 A cart is pulled to the right with 90 N and to the left with 75 N. Which way does the net force act? (a) to the right (b) to the left (c) no net force
24. 24.🔍 Which is the odd one out? (a) a grippy rubber sole (b) sand on a slippery path (c) powder on a carrom board (d) a box pushed on carpet
25. 25.⚖️ Along a straight bar, measured from the left end, the effort is at 80 cm, the fulcrum at 60 cm and the load at 20 cm. Which class of lever is it? (a) class 2 (b) class 1 (c) class 3
26. 26.🛞 More or less friction: oil on a squeaky hinge? (a) more friction (b) less friction
27. 27.⚖️ A seesaw balances. Meena (180 N) sits 3 m from the pivot on one side; Asha (540 N) sits ? m from the pivot on the other side. What is the missing distance in metres?
28. 28.⚖️ Along a straight bar, measured from the left end, the effort is at 0 cm, the fulcrum at 20 cm and the load at 50 cm. Which class of lever is it? (a) class 1 (b) class 3 (c) class 2
29. 29.True or false: a fixed pulley makes you pull 2× rope. (a) False (b) True
30. 30.🏋️ A force of 110 N pushes a cart 8 m along the floor. How much work is done, in joules?
31. 31.🛞 Is friction helpful or a problem here: writing with a pencil? (a) helpful (b) a problem
32. 32.💪 A bag has a mass of 17 kg. Taking 1 kg to weigh about 10 N, what is its weight in newtons?
33. 33.🪝 A bucket weighing 170 N is lifted with a single fixed pulley at the top of a well. What effort is needed, in newtons? (ideal pulley, no friction)
34. 34.🛞 Is friction helpful or a problem here: shoe soles wearing out? (a) a problem (b) helpful
35. 35.⚖️ Along a straight bar, measured from the left end, the effort is at 10 cm, the fulcrum at 40 cm and the load at 20 cm. Which class of lever is it? (a) class 3 (b) class 1 (c) class 2
36. 36.💪 Is drawing up a well bucket a push or a pull? (a) a push (b) a pull
37. 37.⚖️ To lift a heavy rock with a crowbar more easily, push … (a) on the rock (b) near the fulcrum (c) on the fulcrum (d) far from the fulcrum
38. 38.⚖️ A lever bar balances. The load is 240 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?
39. 39.⚖️ A lever bar balances. The load is 100 N at 10 cm from the fulcrum. The effort is 50 N at ? cm from the fulcrum on the other side. What is the missing distance in centimetres?
40. 40.🏋️ A force of 320 N pushes a cart 6 m along the floor. How much work is done, in joules?

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