Engineering Worksheet: Part 2 Test

Engineering lesson 16: Part 2 test: forces and machines · Set 977 · 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.🛞 More or less friction: chalk on a gym bar? (a) less friction (b) more friction
2. 2.⚖️ A seesaw balances. Ravi (? N) sits 1 m from the pivot on one side; Meena (100 N) sits 2 m from the pivot on the other side. What is the missing weight in newtons?
3. 3.🔍 Which is the odd one out? (a) a jar lid (b) a screw jack (c) a flagpole rope wheel (d) a nut and bolt
4. 4.💪 Is hitting a cricket ball a push or a pull? (a) a pull (b) a push
5. 5.True or false: pushing a trolley is a pull. (a) True (b) False
6. 6.🛞 More or less friction: a grippy rubber sole? (a) more friction (b) less friction
7. 7.🪝 A load of 720 N hangs from a pulley system in which 3 rope sections hold up the load. What effort is needed, in newtons? (ideal pulleys)
8. 8.⚖️ What is the pivot point of a lever called? (a) the load (b) the effort (c) the fulcrum (d) the axle
9. 9.🏋️ A smooth ramp is 2 m long and rises 1 m. What effort pushes a 200 N box up it, in newtons? (ideal ramp, no friction)
10. 10.⚙️ Which simple machine is a crane hook block? (a) pulley (b) wedge (c) wheel and axle (d) screw
11. 11.🪝 Fixed or movable pulley: which one hangs on the rope loop? (a) a movable pulley (b) a fixed pulley
12. 12.⚙️ How many simple machines are there in the usual list? (a) 10 (b) 3 (c) 6 (d) 12
13. 13.⚖️ A lever bar balances. The load is 20 N at 20 cm from the fulcrum. The effort is ? N at 20 cm from the fulcrum on the other side. What is the missing force in newtons?
14. 14.True or false: hitting a cricket ball is a push. (a) False (b) True
15. 15.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 8 N, a wooden plank 12 N, a carpet 16 N, ice 4 N. How many newtons more were needed on a carpet than on ice?
16. 16.💪 Two equal forces push on a box from opposite sides. They are … (a) balanced (b) doubled (c) unbalanced (d) gravity
17. 17.🏋️ A smooth ramp is 3 m long and rises 1 m. What effort pushes a 2100 N box up it, in newtons? (ideal ramp, no friction)
18. 18.Which of these is a lever? (a) a flagpole rope wheel (b) a round doorknob (c) a claw hammer on a nail (d) a bottle cap
19. 19.⚖️ A seesaw balances. Arjun (? N) sits 2 m from the pivot on one side; Asha (360 N) sits 3 m from the pivot on the other side. What is the missing weight in newtons?
20. 20.⚖️ Which class of lever is a pair of kitchen tongs? (a) class 2 (b) class 1 (c) class 3
21. 21.🛞 Which surface gives the MOST friction to a sliding block? (a) ice (b) polished marble (c) glass (d) sandpaper
22. 22.🪝 A winch has a wheel of radius 4 cm and an axle of radius 2 cm. What effort on the wheel lifts a 320 N bucket on the axle, in newtons? (ideal)
23. 23.⚖️ A lever bar balances. The load is 100 N at ? cm from the fulcrum. The effort is 100 N at 50 cm from the fulcrum on the other side. What is the missing distance in centimetres?
24. 24.🏋️ A machine lifts a load of 60 N when you push with 30 N. What is its mechanical advantage (MA)?
25. 25.🪝 A load of 510 N hangs from a pulley system in which 3 rope sections hold up the load. What effort is needed, in newtons? (ideal pulleys)
26. 26.⚖️ A lever bar balances. The load is 60 N at ? cm from the fulcrum. The effort is 40 N at 30 cm from the fulcrum on the other side. What is the missing distance in centimetres?
27. 27.⚖️ In a class 1 lever, what is in the middle? (a) nothing (b) the effort (c) the fulcrum (d) the load
28. 28.🏋️ A force of 490 N did 2940 J of work. How many metres did the object move?
29. 29.🏋️ Can a simple machine reduce the work done? (a) no, work stays the same (b) only on Mondays (c) yes, always (d) yes, by half
30. 30.🪝 A bucket weighing 430 N is lifted with a single fixed pulley at the top of a well. What effort is needed, in newtons? (ideal pulley, no friction)
31. 31.💪 A force is a … (a) type of sound (b) kind of colour (c) push or a pull (d) unit of time
32. 32.🪝 Fixed or movable pulley: which one stays in one place? (a) a movable pulley (b) a fixed pulley
33. 33.True or false: plucking a mango is a push. (a) False (b) True
34. 34.🔍 Which is the odd one out? (a) a wet tiled floor (b) a box pushed on carpet (c) powder on a carrom board (d) a wheel on ball bearings
35. 35.🛞 Is friction helpful or a problem here: walking without slipping? (a) a problem (b) helpful
36. 36.⚖️ Which class of lever is a broom when sweeping? (a) class 3 (b) class 1 (c) class 2
37. 37.🛞 More or less friction: sand on a slippery path? (a) more friction (b) less friction
38. 38.⚖️ A lever balances when … (a) turning effects match (b) the fulcrum moves (c) both weights are equal (d) the bar is short
39. 39.🪝 What does a single fixed pulley change? (a) the direction of pull (b) the size of the load (c) the colour of rope (d) gravity
40. 40.True or false: your forearm is a class 2 lever (load in the middle). (a) False (b) True

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