Engineering Worksheet: Part 2 Test

Engineering lesson 16: Part 2 test: forces and machines · Set 350 · 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.🛞 Is friction helpful or a problem here: walking without slipping? (a) helpful (b) a problem
2. 2.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 8 N, ice 1 N, a wooden plank 5 N, a carpet 6 N. Which surface gave the most friction? (a) a carpet (b) ice (c) a wooden plank (d) sandpaper
3. 3.🛞 Is friction helpful or a problem here: gripping a cricket bat? (a) a problem (b) helpful
4. 4.🪝 Fixed or movable pulley: which one hangs on the rope loop? (a) a fixed pulley (b) a movable pulley
5. 5.True or false: a wet tiled floor gives less friction. (a) False (b) True
6. 6.⚖️ A seesaw balances. Arjun (640 N) sits ? m from the pivot on one side; Ravi (480 N) sits 4 m from the pivot on the other side. What is the missing distance in metres?
7. 7.🏋️ A machine lifts a load of 90 N when you push with 30 N. What is its mechanical advantage (MA)?
8. 8.🛞 Why are tyres made with deep treads? (a) to look nice (b) to grip the road (c) to go slower (d) to save rubber
9. 9.⚖️ A lever bar balances. The load is 160 N at ? cm from the fulcrum. The effort is 20 N at 80 cm from the fulcrum on the other side. What is the missing distance in centimetres?
10. 10.💪 In a tug of war, one team pulls right with 80 N and the other pulls left with 15 N. What is the size of the net force, in newtons?
11. 11.💪 A cart is pulled to the right with 55 N and to the left with 70 N. Which way does the net force act? (a) no net force (b) to the right (c) to the left
12. 12.💪 A force is a … (a) push or a pull (b) kind of colour (c) unit of time (d) type of sound
13. 13.🛞 More or less friction: a box pushed on carpet? (a) less friction (b) more friction
14. 14.⚖️ A lever bar balances. The load is ? N at 10 cm from the fulcrum. The effort is 20 N at 90 cm from the fulcrum on the other side. What is the missing force in newtons?
15. 15.💪 Two children push a box to the right, one with 90 N and the other with 70 N. What is the net (total) force on the box, in newtons?
16. 16.⚖️ To lift a heavy rock with a crowbar more easily, push … (a) near the fulcrum (b) far from the fulcrum (c) on the rock (d) on the fulcrum
17. 17.💪 A bag has a mass of 35 kg. Taking 1 kg to weigh about 10 N, what is its weight in newtons?
18. 18.🏋️ Work is done when a force moves something … (a) without moving it (b) only upwards (c) very slowly (d) through a distance
19. 19.🪝 A winch has a wheel of radius 18 cm and an axle of radius 3 cm. What effort on the wheel lifts a 120 N bucket on the axle, in newtons? (ideal)
20. 20.🛞 Is friction helpful or a problem here: a door hinge squeaking? (a) helpful (b) a problem
21. 21.💪 Is opening a drawer a push or a pull? (a) a push (b) a pull
22. 22.⚖️ Along a straight bar, measured from the left end, the effort is at 20 cm, the fulcrum at 50 cm and the load at 30 cm. Which class of lever is it? (a) class 3 (b) class 2 (c) class 1
23. 23.True or false: skating on ice gives more friction. (a) False (b) True
24. 24.🛞 More or less friction: a grippy rubber sole? (a) more friction (b) less friction
25. 25.🪝 Fixed or movable pulley: which one rises with the load? (a) a fixed pulley (b) a movable pulley
26. 26.⚖️ A lever bar balances. The load is ? N at 40 cm from the fulcrum. The effort is 160 N at 90 cm from the fulcrum on the other side. What is the missing force in newtons?
27. 27.⚖️ In a class 2 lever, what is in the middle? (a) the load (b) the fulcrum (c) the effort (d) the axle
28. 28.Which of these is caused by gravity? (a) squeezing a lemon (b) rubbing hands warms them (c) a compass needle turns (d) an apple falls down
29. 29.⚖️ Along a straight bar, measured from the left end, the effort is at 30 cm, the fulcrum at 90 cm and the load at 70 cm. Which class of lever is it? (a) class 1 (b) class 3 (c) class 2
30. 30.🔍 Which is the odd one out? (a) a box pushed on carpet (b) powder on a carrom board (c) a wheel on ball bearings (d) a smooth steel slide
31. 31.💪 Two children push a box to the right, one with 75 N and the other with 95 N. What is the net (total) force on the box, in newtons?
32. 32.🪝 A well winch has a handle (wheel) of radius 20 cm turning an axle of radius 4 cm. What is its mechanical advantage (MA)?
33. 33.🛞 Rubbing your hands fast makes them … (a) cold (b) wet (c) warm (d) magnetic
34. 34.⚖️ Which class of lever is a pair of kitchen tongs? (a) class 1 (b) class 3 (c) class 2
35. 35.⚖️ Along a straight bar, measured from the left end, the effort is at 50 cm, the fulcrum at 40 cm and the load at 30 cm. Which class of lever is it? (a) class 3 (b) class 1 (c) class 2
36. 36.⚖️ Turning effect = force × … (a) distance from fulcrum (b) mass of fulcrum (c) colour of bar (d) time taken
37. 37.🏋️ A machine lifts a load of 210 N when you push with 70 N. What is its mechanical advantage (MA)?
38. 38.🔍 Which is the odd one out? (a) a well winch handle (b) a playground slide (c) a water tap handle (d) a steering wheel
39. 39.💪 Is pushing a swing a push or a pull? (a) a pull (b) a push
40. 40.True or false: a lemon squeezer is a class 2 lever (load in the middle). (a) False (b) True

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