Engineering Worksheet: Part 2 Test

Engineering lesson 16: Part 2 test: forces and machines · Set 299 · 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. Ravi (190 N) sits 4 m from the pivot on one side; Kabir (? N) sits 1 m from the pivot on the other side. What is the missing weight in newtons?
2. 2.💪 Is closing a drawer a push or a pull? (a) a push (b) a pull
3. 3.🛞 More or less friction: powder on a carrom board? (a) more friction (b) less friction
4. 4.Which of these is caused by magnetic force? (a) a compass needle turns (b) a river flows downhill (c) shoes grip the floor (d) a thrown ball comes down
5. 5.🏋️ Pushing a crate 5 m took 700 J of work. What force was used, in newtons?
6. 6.True or false: a movable pulley rises with the load. (a) False (b) True
7. 7.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 9 N, sandpaper 13 N, ice 4 N, a glass sheet 7 N. How many newtons more were needed on sandpaper than on ice?
8. 8.💪 A bag has a mass of 5 kg. Taking 1 kg to weigh about 10 N, what is its weight in newtons?
9. 9.True or false: drawing up a well bucket is a pull. (a) True (b) False
10. 10.Which of these is a lever? (a) a crane hook block (b) a water tap handle (c) a playground slide (d) a claw hammer on a nail
11. 11.🔍 Which is the odd one out? (a) a playground slide (b) a road up a hill (c) a wheelchair ramp (d) a well winch handle
12. 12.⚖️ In a class 1 lever, what is in the middle? (a) the fulcrum (b) nothing (c) the effort (d) the load
13. 13.🏋️ Pushing a crate 10 m took 3700 J of work. What force was used, in newtons?
14. 14.🪝 A well winch has a handle (wheel) of radius 6 cm turning an axle of radius 3 cm. What is its mechanical advantage (MA)?
15. 15.💪 Which force is at work: rain falls to the ground? (a) muscular force (b) friction (c) magnetic force (d) gravity
16. 16.🏋️ A force of 320 N pushes a cart 2 m along the floor. How much work is done, in joules?
17. 17.💪 A force is a … (a) push or a pull (b) kind of colour (c) type of sound (d) unit of time
18. 18.⚖️ On a seesaw, a heavier child should sit … (a) closer to the pivot (b) anywhere (c) on the pivot (d) farther from the pivot
19. 19.💪 A bag has a mass of 50 kg. Taking 1 kg to weigh about 10 N, what is its weight in newtons?
20. 20.💪 Which force is at work: lifting a school bag? (a) magnetic force (b) muscular force (c) gravity (d) friction
21. 21.⚖️ A lever bar balances. The load is 120 N at 10 cm from the fulcrum. The effort is ? N at 60 cm from the fulcrum on the other side. What is the missing force in newtons?
22. 22.⚖️ Going along a lever from one end to the other, the order is: effort, load, fulcrum. Which class of lever is it? (a) class 1 (b) class 3 (c) class 2
23. 23.⚙️ Which simple machine is a water tap handle? (a) screw (b) lever (c) wheel and axle (d) wedge
24. 24.True or false: a movable pulley only changes direction. (a) True (b) False
25. 25.⚖️ A lever bar balances. The load is 80 N at 10 cm from the fulcrum. The effort is ? N at 80 cm from the fulcrum on the other side. What is the missing force in newtons?
26. 26.True or false: a wet tiled floor gives more friction. (a) False (b) True
27. 27.🔍 Which is the odd one out? (a) powder on a carrom board (b) sand on a slippery path (c) a wheel on ball bearings (d) a smooth steel slide
28. 28.True or false: a wet tiled floor gives less friction. (a) False (b) True
29. 29.🛞 More or less friction: a grippy rubber sole? (a) more friction (b) less friction
30. 30.🪝 Fixed or movable pulley: which one only changes direction? (a) a fixed pulley (b) a movable pulley
31. 31.True or false: a movable pulley halves the effort. (a) False (b) True
32. 32.🏋️ Pushing a crate 6 m took 120 J of work. What force was used, in newtons?
33. 33.🏋️ A force of 50 N did 100 J of work. How many metres did the object move?
34. 34.🏋️ Work is done when a force moves something … (a) without moving it (b) through a distance (c) very slowly (d) only upwards
35. 35.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 13 N, a glass sheet 4 N, a wooden plank 7 N, a carpet 9 N. How many newtons more were needed on sandpaper than on a glass sheet?
36. 36.Which of these is a wedge? (a) a well winch handle (b) a crane hook block (c) a flagpole rope wheel (d) a knife edge
37. 37.🏋️ Can a simple machine reduce the work done? (a) yes, by half (b) only on Mondays (c) no, work stays the same (d) yes, always
38. 38.⚖️ A lever bar balances. The load is 120 N at 10 cm from the fulcrum. The effort is ? N at 40 cm from the fulcrum on the other side. What is the missing force in newtons?
39. 39.🪝 A bucket weighing 140 N is lifted with a single fixed pulley at the top of a well. What effort is needed, in newtons? (ideal pulley, no friction)
40. 40.🪝 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

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