Engineering Worksheet: Part 2 Test

Engineering lesson 16: Part 2 test: forces and machines · Set 259 · 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 (? N) sits 4 m from the pivot on one side; Zoya (440 N) sits 1 m from the pivot on the other side. What is the missing weight in newtons?
2. 2.🛞 Is friction helpful or a problem here: walking without slipping? (a) a problem (b) helpful
3. 3.⚖️ Going along a lever from one end to the other, the order is: effort, load, fulcrum. Which class of lever is it? (a) class 2 (b) class 1 (c) class 3
4. 4.Which of these is a pulley? (a) a claw hammer on a nail (b) a jar lid (c) a window blind cord (d) a seesaw
5. 5.🛞 How can we reduce friction in a machine? (a) add sand (b) press parts harder (c) oil the moving parts (d) make parts rough
6. 6.⚙️ Most simple machines make work easier by letting us … (a) switch off gravity (b) stop all friction (c) make new energy (d) use a smaller force
7. 7.💪 Is hitting a cricket ball a push or a pull? (a) a push (b) a pull
8. 8.🪝 Fixed or movable pulley: which one rises with the load? (a) a movable pulley (b) a fixed pulley
9. 9.🪝 A bucket weighing 270 N is lifted with a single fixed pulley at the top of a well. What effort is needed, in newtons? (ideal pulley, no friction)
10. 10.🪝 A well winch has a handle (wheel) of radius 12 cm turning an axle of radius 2 cm. What is its mechanical advantage (MA)?
11. 11.⚙️ A screw is really … (a) a tiny pulley (b) a kind of wheel (c) a bent lever (d) a ramp wrapped round
12. 12.🪝 A pulley system lifts a 510 N load with an effort of 170 N. What is its mechanical advantage (MA)?
13. 13.True or false: a grippy rubber sole gives more friction. (a) False (b) True
14. 14.⚖️ Along a straight bar, measured from the left end, the effort is at 0 cm, the fulcrum at 60 cm and the load at 30 cm. Which class of lever is it? (a) class 3 (b) class 1 (c) class 2
15. 15.🪝 A wheel and axle is a big wheel fixed to … (a) a sharp wedge (b) a smaller rod (axle) (c) a loose rope (d) a flat ramp
16. 16.True or false: a bottle opener is a lever. (a) True (b) False
17. 17.🔍 Which is the odd one out? (a) a window blind cord (b) a crane hook block (c) a round doorknob (d) a flagpole rope wheel
18. 18.🛞 More or less friction: skating on ice? (a) more friction (b) less friction
19. 19.⚖️ Going along a lever from one end to the other, the order is: fulcrum, load, effort. Which class of lever is it? (a) class 3 (b) class 1 (c) class 2
20. 20.🏋️ A 3 kg box is lifted straight up by 4 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
21. 21.⚖️ Along a straight bar, measured from the left end, the effort is at 20 cm, the fulcrum at 60 cm and the load at 30 cm. Which class of lever is it? (a) class 2 (b) class 1 (c) class 3
22. 22.🔍 Which is the odd one out? (a) a smooth steel slide (b) a grippy rubber sole (c) a box pushed on carpet (d) sand on a slippery path
23. 23.⚖️ A seesaw balances. Meena (100 N) sits ? m from the pivot on one side; Arjun (300 N) sits 1 m from the pivot on the other side. What is the missing distance in metres?
24. 24.🏋️ A force of 50 N did 250 J of work. How many metres did the object move?
25. 25.True or false: closing a drawer is a push. (a) False (b) True
26. 26.⚖️ Along a straight bar, measured from the left end, the effort is at 20 cm, the fulcrum at 30 cm and the load at 70 cm. Which class of lever is it? (a) class 1 (b) class 2 (c) class 3
27. 27.💪 Is plucking a mango a push or a pull? (a) a pull (b) a push
28. 28.💪 Which force is at work: rubbing hands warms them? (a) gravity (b) muscular force (c) friction (d) magnetic force
29. 29.💪 In a tug of war, one team pulls right with 65 N and the other pulls left with 50 N. What is the size of the net force, in newtons?
30. 30.💪 Two children push a box to the right, one with 90 N and the other with 25 N. What is the net (total) force on the box, in newtons?
31. 31.🏋️ A force of 480 N did 1440 J of work. How many metres did the object move?
32. 32.🛞 More or less friction: oil on a squeaky hinge? (a) less friction (b) more friction
33. 33.⚖️ A lever bar balances. The load is 240 N at 40 cm from the fulcrum. The effort is 120 N at ? cm from the fulcrum on the other side. What is the missing distance in centimetres?
34. 34.⚖️ Which class of lever is a pair of kitchen tongs? (a) class 1 (b) class 2 (c) class 3
35. 35.True or false: a fixed pulley makes you pull 2× rope. (a) False (b) True
36. 36.True or false: a box pushed on carpet gives more friction. (a) True (b) False
37. 37.True or false: a pair of tweezers is a class 2 lever (load in the middle). (a) False (b) True
38. 38.True or false: opening a drawer is a push. (a) True (b) False
39. 39.True or false: closing a drawer is a pull. (a) True (b) False
40. 40.⚖️ A seesaw balances. Ravi (? N) sits 3 m from the pivot on one side; Zoya (570 N) sits 2 m from the pivot on the other side. What is the missing weight in newtons?

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