Engineering Worksheet: Part 2 Test

Engineering lesson 16: Part 2 test: forces and machines · Set 18 · 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.⚖️ Which class of lever is a broom when sweeping? (a) class 3 (b) class 1 (c) class 2
2. 2.💪 A bag has a mass of 3 kg. Taking 1 kg to weigh about 10 N, what is its weight in newtons?
3. 3.🏋️ Can a simple machine reduce the work done? (a) only on Mondays (b) yes, always (c) no, work stays the same (d) yes, by half
4. 4.🏋️ Mechanical advantage (MA) = … (a) effort ÷ load (b) load × effort (c) load + effort (d) load ÷ effort
5. 5.True or false: a fixed pulley only changes direction. (a) True (b) False
6. 6.True or false: a pair of scissors is a class 2 lever (load in the middle). (a) True (b) False
7. 7.True or false: plucking a mango is a push. (a) False (b) True
8. 8.True or false: a pair of tweezers is a class 2 lever (load in the middle). (a) False (b) True
9. 9.🪝 More rope sections holding a load means … (a) the load floats (b) less effort needed (c) no change (d) more effort needed
10. 10.⚖️ A lever balances when … (a) the fulcrum moves (b) both weights are equal (c) turning effects match (d) the bar is short
11. 11.True or false: a pair of scissors is a class 1 lever (fulcrum in the middle). (a) False (b) True
12. 12.💪 A cart is pulled to the right with 40 N and to the left with 25 N. Which way does the net force act? (a) no net force (b) to the left (c) to the right
13. 13.💪 In a tug of war, one team pulls left with 70 N and the other pulls right with 65 N. What is the size of the net force, in newtons?
14. 14.⚖️ A seesaw balances. Arjun (680 N) sits ? m from the pivot on one side; Asha (510 N) sits 4 m from the pivot on the other side. What is the missing distance in metres?
15. 15.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 9 N, sandpaper 12 N, ice 2 N, a wooden plank 6 N. Which surface gave the most friction? (a) a wooden plank (b) a carpet (c) ice (d) sandpaper
16. 16.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 8 N, sandpaper 10 N, ice 1 N, a glass sheet 5 N. Which surface gave the most friction? (a) ice (b) a glass sheet (c) sandpaper (d) a carpet
17. 17.🏋️ A machine lifts a load of 40 N when you push with 10 N. What is its mechanical advantage (MA)?
18. 18.True or false: powder on a carrom board gives more friction. (a) True (b) False
19. 19.⚖️ A lever bar balances. The load is 280 N at 10 cm from the fulcrum. The effort is ? N at 70 cm from the fulcrum on the other side. What is the missing force in newtons?
20. 20.🛞 Is friction helpful or a problem here: brakes stopping a cycle? (a) helpful (b) a problem
21. 21.True or false: a tug of war is a pull. (a) False (b) True
22. 22.True or false: a wet tiled floor gives more friction. (a) True (b) False
23. 23.⚖️ Along a straight bar, measured from the left end, the effort is at 30 cm, the fulcrum at 0 cm and the load at 50 cm. Which class of lever is it? (a) class 1 (b) class 3 (c) class 2
24. 24.True or false: a crane hook block is a wheel and axle. (a) True (b) False
25. 25.💪 Which force is at work: an apple falls down? (a) magnetic force (b) gravity (c) friction (d) muscular force
26. 26.🛞 Why are tyres made with deep treads? (a) to save rubber (b) to grip the road (c) to look nice (d) to go slower
27. 27.Which of these is caused by gravity? (a) brakes stop a bicycle (b) squeezing a lemon (c) a rolling ball slows (d) rain falls to the ground
28. 28.🪝 A bucket weighing 90 N is lifted with a single fixed pulley at the top of a well. What effort is needed, in newtons? (ideal pulley, no friction)
29. 29.🛞 Is friction helpful or a problem here: a knot holding a rope? (a) a problem (b) helpful
30. 30.💪 Is pushing a swing a push or a pull? (a) a push (b) a pull
31. 31.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 2 N, a wooden plank 6 N, a carpet 10 N, ice 1 N. Which surface gave the most friction? (a) a glass sheet (b) ice (c) a wooden plank (d) a carpet
32. 32.True or false: pulling a cart is a push. (a) False (b) True
33. 33.⚖️ Turning effect = force × … (a) distance from fulcrum (b) colour of bar (c) mass of fulcrum (d) time taken
34. 34.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 8 N, ice 3 N, a glass sheet 5 N, a wooden plank 7 N. How many newtons more were needed on a carpet than on ice?
35. 35.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 6 N, a wooden plank 8 N, a carpet 9 N, ice 2 N. Which surface gave the most friction? (a) a wooden plank (b) a glass sheet (c) a carpet (d) ice
36. 36.🔍 Which is the odd one out? (a) a knife edge (b) a wheelchair ramp (c) a door stopper (d) an axe blade
37. 37.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 1 N, a glass sheet 3 N, a wooden plank 7 N, sandpaper 10 N. Which surface gave the most friction? (a) a glass sheet (b) a wooden plank (c) ice (d) sandpaper
38. 38.🏋️ A longer ramp to the same height needs … (a) more effort (b) less effort (c) the same effort (d) no effort
39. 39.⚖️ A seesaw balances. Asha (140 N) sits 1 m from the pivot on one side; Ravi (? N) sits 1 m from the pivot on the other side. What is the missing weight in newtons?
40. 40.🪝 A wheel and axle is a big wheel fixed to … (a) a flat ramp (b) a sharp wedge (c) a loose rope (d) a smaller rod (axle)

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