Engineering Worksheet: Part 2 Test

Engineering lesson 16: Part 2 test: forces and machines · Set 125 · 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 seesaw balances. Asha (300 N) sits 1 m from the pivot on one side; Zoya (? N) sits 3 m from the pivot on the other side. What is the missing weight in newtons?
2. 2.True or false: closing a drawer is a pull. (a) False (b) True
3. 3.💪 A cart is pulled to the right with 95 N and to the left with 105 N. Which way does the net force act? (a) no net force (b) to the right (c) to the left
4. 4.💪 Two children push a box to the right, one with 95 N and the other with 65 N. What is the net (total) force on the box, in newtons?
5. 5.⚖️ On a seesaw, a heavier child should sit … (a) farther from the pivot (b) anywhere (c) on the pivot (d) closer to the pivot
6. 6.⚖️ A lever bar balances. The load is 300 N at ? cm from the fulcrum. The effort is 100 N at 60 cm from the fulcrum on the other side. What is the missing distance in centimetres?
7. 7.🏋️ A machine lifts a load of 440 N when you push with 110 N. What is its mechanical advantage (MA)?
8. 8.⚖️ A seesaw balances. Kabir (400 N) sits 1 m from the pivot on one side; Asha (? N) sits 2 m from the pivot on the other side. What is the missing weight in newtons?
9. 9.True or false: a jar lid is a wheel and axle. (a) False (b) True
10. 10.True or false: opening a drawer is a pull. (a) False (b) True
11. 11.💪 A cart is pulled to the right with 100 N and to the left with 105 N. Which way does the net force act? (a) to the right (b) to the left (c) no net force
12. 12.⚖️ What is the pivot point of a lever called? (a) the fulcrum (b) the effort (c) the load (d) the axle
13. 13.⚖️ Which class of lever is a pair of tweezers? (a) class 1 (b) class 3 (c) class 2
14. 14.True or false: pressing a doorbell is a push. (a) False (b) True
15. 15.🪝 A bucket weighing 460 N is lifted with a single fixed pulley at the top of a well. What effort is needed, in newtons? (ideal pulley, no friction)
16. 16.⚖️ Which class of lever is a broom when sweeping? (a) class 1 (b) class 2 (c) class 3
17. 17.💪 Two equal forces push on a box from opposite sides. They are … (a) balanced (b) doubled (c) gravity (d) unbalanced
18. 18.💪 A bag has a mass of 2 kg. Taking 1 kg to weigh about 10 N, what is its weight in newtons?
19. 19.🏋️ A smooth ramp is 4 m long and rises 1 m. What effort pushes a 3000 N box up it, in newtons? (ideal ramp, no friction)
20. 20.🏋️ A force of 230 N pushes a cart 10 m along the floor. How much work is done, in joules?
21. 21.⚖️ Turning effect = force × … (a) mass of fulcrum (b) colour of bar (c) distance from fulcrum (d) time taken
22. 22.🛞 Is friction helpful or a problem here: writing with a pencil? (a) helpful (b) a problem
23. 23.⚖️ A seesaw balances. Asha (220 N) sits 4 m from the pivot on one side; Zoya (440 N) sits ? m from the pivot on the other side. What is the missing distance in metres?
24. 24.🏋️ Mechanical advantage (MA) = … (a) load + effort (b) load × effort (c) effort ÷ load (d) load ÷ effort
25. 25.🪝 A wheel and axle is a big wheel fixed to … (a) a loose rope (b) a sharp wedge (c) a flat ramp (d) a smaller rod (axle)
26. 26.⚖️ A lever balances when … (a) the bar is short (b) the fulcrum moves (c) both weights are equal (d) turning effects match
27. 27.💪 A bag has a mass of 48 kg. Taking 1 kg to weigh about 10 N, what is its weight in newtons?
28. 28.⚖️ Along a straight bar, measured from the left end, the effort is at 50 cm, the fulcrum at 30 cm and the load at 60 cm. Which class of lever is it? (a) class 2 (b) class 3 (c) class 1
29. 29.True or false: a grippy rubber sole gives less friction. (a) True (b) False
30. 30.🪝 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?
31. 31.True or false: pressing a doorbell is a pull. (a) False (b) True
32. 32.⚙️ A wedge is … (a) a bar on a pivot (b) a rope on a wheel (c) a wheel on a rod (d) two ramps back to back
33. 33.🪝 A bucket weighing 210 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.True or false: pushing a swing is a pull. (a) True (b) False
35. 35.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 12 N, ice 4 N, a glass sheet 6 N, a carpet 9 N. How many newtons more were needed on sandpaper than on ice?
36. 36.🛞 More or less friction: sand on a slippery path? (a) less friction (b) more friction
37. 37.⚖️ A seesaw balances. Zoya (? N) sits 1 m from the pivot on one side; Arjun (120 N) sits 2 m from the pivot on the other side. What is the missing weight in newtons?
38. 38.🪝 More rope sections holding a load means … (a) more effort needed (b) less effort needed (c) the load floats (d) no change
39. 39.Which of these is a wedge? (a) an axe blade (b) a claw hammer on a nail (c) a round doorknob (d) a flagpole rope wheel
40. 40.🪝 A load of 560 N hangs from a pulley system in which 2 rope sections hold up the load. What effort is needed, in newtons? (ideal pulleys)

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