Engineering Worksheet: Part 2 Test

Engineering lesson 16: Part 2 test: forces and machines · Set 408 · 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. Arjun (? N) sits 4 m from the pivot on one side; Kabir (480 N) sits 4 m from the pivot on the other side. What is the missing weight in newtons?
2. 2.⚖️ Turning effect = force × … (a) colour of bar (b) time taken (c) distance from fulcrum (d) mass of fulcrum
3. 3.🏋️ A smooth ramp is 9 m long and rises 3 m. What effort pushes a 1800 N box up it, in newtons? (ideal ramp, no friction)
4. 4.🏋️ A force of 450 N pushes a cart 1 m along the floor. How much work is done, in joules?
5. 5.🛞 More or less friction: a grippy rubber sole? (a) less friction (b) more friction
6. 6.💪 Two equal forces push on a box from opposite sides. They are … (a) balanced (b) unbalanced (c) gravity (d) doubled
7. 7.⚖️ A seesaw balances. Meena (600 N) sits ? m from the pivot on one side; Ravi (300 N) sits 4 m from the pivot on the other side. What is the missing distance in metres?
8. 8.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 6 N, ice 1 N, a glass sheet 3 N, a wooden plank 4 N. Which surface gave the most friction? (a) a glass sheet (b) a wooden plank (c) ice (d) sandpaper
9. 9.True or false: pressing a doorbell is a pull. (a) False (b) True
10. 10.⚖️ Which class of lever is a pair of pliers? (a) class 2 (b) class 3 (c) class 1
11. 11.🛞 How can we reduce friction in a machine? (a) make parts rough (b) add sand (c) oil the moving parts (d) press parts harder
12. 12.🏋️ A 14 kg box is lifted straight up by 2 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
13. 13.True or false: a fixed pulley rises with the load. (a) True (b) False
14. 14.⚙️ Which simple machine is a well winch handle? (a) inclined plane (b) wheel and axle (c) screw (d) wedge
15. 15.Which of these is caused by gravity? (a) a rolling ball slows (b) shoes grip the floor (c) a fridge magnet sticks (d) an apple falls down
16. 16.True or false: a grippy rubber sole gives less friction. (a) True (b) False
17. 17.⚖️ A lever bar balances. The load is 300 N at 10 cm from the fulcrum. The effort is 60 N at ? cm from the fulcrum on the other side. What is the missing distance in centimetres?
18. 18.⚖️ A seesaw balances. Ravi (? N) sits 2 m from the pivot on one side; Zoya (340 N) sits 3 m from the pivot on the other side. What is the missing weight in newtons?
19. 19.True or false: drawing up a well bucket is a push. (a) True (b) False
20. 20.⚖️ Along a straight bar, measured from the left end, the effort is at 50 cm, the fulcrum at 0 cm and the load at 10 cm. Which class of lever is it? (a) class 3 (b) class 1 (c) class 2
21. 21.True or false: a pair of scissors is a class 1 lever (fulcrum in the middle). (a) False (b) True
22. 22.⚙️ Which simple machine is a claw hammer on a nail? (a) inclined plane (b) lever (c) wedge (d) screw
23. 23.⚙️ A screw is really … (a) a kind of wheel (b) a tiny pulley (c) a ramp wrapped round (d) a bent lever
24. 24.True or false: a wheel on ball bearings gives less friction. (a) True (b) False
25. 25.🛞 More or less friction: powder on a carrom board? (a) more friction (b) less friction
26. 26.True or false: a beam balance is a class 2 lever (load in the middle). (a) True (b) False
27. 27.⚖️ A lever bar balances. The load is 120 N at 30 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?
28. 28.🛞 Is friction helpful or a problem here: a door hinge squeaking? (a) helpful (b) a problem
29. 29.⚙️ Most simple machines make work easier by letting us … (a) switch off gravity (b) make new energy (c) stop all friction (d) use a smaller force
30. 30.🪝 A pulley system lifts a 560 N load with an effort of 280 N. What is its mechanical advantage (MA)?
31. 31.🏋️ A longer ramp to the same height needs … (a) less effort (b) the same effort (c) more effort (d) no effort
32. 32.⚖️ Along a straight bar, measured from the left end, the effort is at 50 cm, the fulcrum at 20 cm and the load at 90 cm. Which class of lever is it? (a) class 1 (b) class 3 (c) class 2
33. 33.🏋️ Pushing a crate 7 m took 2800 J of work. What force was used, in newtons?
34. 34.⚖️ A lever bar balances. The load is ? N at 20 cm from the fulcrum. The effort is 140 N at 20 cm from the fulcrum on the other side. What is the missing force in newtons?
35. 35.🔍 Which is the odd one out? (a) a steering wheel (b) a well-bucket rope wheel (c) a window blind cord (d) a flagpole rope wheel
36. 36.⚖️ Which class of lever is a beam balance? (a) class 3 (b) class 1 (c) class 2
37. 37.🔍 Which is the odd one out? (a) a screw jack (b) a flagpole rope wheel (c) a window blind cord (d) a crane hook block
38. 38.💪 Is hitting a cricket ball a push or a pull? (a) a push (b) a pull
39. 39.🪝 Fixed or movable pulley: which one hangs on the rope loop? (a) a fixed pulley (b) a movable pulley
40. 40.⚖️ A lever bar balances. The load is 240 N at ? cm from the fulcrum. The effort is 40 N at 60 cm from the fulcrum on the other side. What is the missing distance in centimetres?

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