Engineering Worksheet: Part 2 Test

Engineering lesson 16: Part 2 test: forces and machines · Set 191 · 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.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 6 N, sandpaper 7 N, ice 3 N, a glass sheet 4 N. Which surface gave the least friction? (a) a glass sheet (b) ice (c) sandpaper (d) a wooden plank
2. 2.🪝 A winch has a wheel of radius 12 cm and an axle of radius 2 cm. What effort on the wheel lifts a 180 N bucket on the axle, in newtons? (ideal)
3. 3.🪝 A load of 540 N hangs from a pulley system in which 2 rope sections hold up the load. What effort is needed, in newtons? (ideal pulleys)
4. 4.⚖️ Which class of lever is a bottle opener? (a) class 1 (b) class 3 (c) class 2
5. 5.💪 Is plucking a mango a push or a pull? (a) a push (b) a pull
6. 6.🪝 A load of 880 N hangs from a pulley system in which 4 rope sections hold up the load. What effort is needed, in newtons? (ideal pulleys)
7. 7.True or false: a movable pulley only changes direction. (a) False (b) True
8. 8.Which of these is an inclined plane? (a) a bottle opener (b) a seesaw (c) a crowbar (d) a road up a hill
9. 9.⚖️ In a class 2 lever, what is in the middle? (a) the fulcrum (b) the axle (c) the effort (d) the load
10. 10.🏋️ Pushing a crate 4 m took 520 J of work. What force was used, in newtons?
11. 11.⚖️ A seesaw balances. Asha (300 N) sits 1 m from the pivot on one side; Ravi (150 N) sits ? m from the pivot on the other side. What is the missing distance in metres?
12. 12.⚖️ On a seesaw, a heavier child should sit … (a) anywhere (b) on the pivot (c) closer to the pivot (d) farther from the pivot
13. 13.⚖️ A lever balances when … (a) the fulcrum moves (b) turning effects match (c) both weights are equal (d) the bar is short
14. 14.🪝 A winch has a wheel of radius 12 cm and an axle of radius 2 cm. What effort on the wheel lifts a 120 N bucket on the axle, in newtons? (ideal)
15. 15.⚖️ A lever bar balances. The load is 200 N at 10 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?
16. 16.💪 Which force is at work: an apple falls down? (a) muscular force (b) magnetic force (c) gravity (d) friction
17. 17.💪 Two equal forces push on a box from opposite sides. They are … (a) balanced (b) doubled (c) gravity (d) unbalanced
18. 18.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 9 N, sandpaper 11 N, a glass sheet 3 N, a wooden plank 7 N. Which surface gave the least friction? (a) a glass sheet (b) a wooden plank (c) a carpet (d) sandpaper
19. 19.⚖️ A seesaw balances. Zoya (440 N) sits 4 m from the pivot on one side; Meena (? N) sits 4 m from the pivot on the other side. What is the missing weight in newtons?
20. 20.⚖️ Going along a lever from one end to the other, the order is: load, effort, fulcrum. Which class of lever is it? (a) class 2 (b) class 1 (c) class 3
21. 21.💪 Which force is at work: a thrown ball comes down? (a) gravity (b) muscular force (c) friction (d) magnetic force
22. 22.🛞 More or less friction: oil on a squeaky hinge? (a) more friction (b) less friction
23. 23.🏋️ A force of 330 N did 2640 J of work. How many metres did the object move?
24. 24.⚖️ Which class of lever is a seesaw? (a) class 2 (b) class 3 (c) class 1
25. 25.⚖️ Along a straight bar, measured from the left end, the effort is at 50 cm, the fulcrum at 10 cm and the load at 30 cm. Which class of lever is it? (a) class 2 (b) class 1 (c) class 3
26. 26.Which of these is a pulley? (a) a steering wheel (b) a knife edge (c) a wood screw (d) a crane hook block
27. 27.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 5 N, sandpaper 8 N, a glass sheet 1 N, a wooden plank 2 N. Which surface gave the most friction? (a) a wooden plank (b) sandpaper (c) a carpet (d) a glass sheet
28. 28.Which of these is caused by muscular force? (a) a river flows downhill (b) brakes stop a bicycle (c) pedalling a cycle (d) shoes grip the floor
29. 29.True or false: pushing a swing is a pull. (a) False (b) True
30. 30.🏋️ A force of 130 N pushes a cart 10 m along the floor. How much work is done, in joules?
31. 31.True or false: a nutcracker is a class 2 lever (load in the middle). (a) True (b) False
32. 32.🛞 Is friction helpful or a problem here: brakes stopping a cycle? (a) a problem (b) helpful
33. 33.⚙️ Which simple machine is a steering wheel? (a) pulley (b) screw (c) inclined plane (d) wheel and axle
34. 34.⚖️ A lever bar balances. The load is 140 N at 30 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?
35. 35.⚖️ Which class of lever is a wheelbarrow? (a) class 2 (b) class 1 (c) class 3
36. 36.🔍 Which is the odd one out? (a) powder on a carrom board (b) a tyre with deep treads (c) a wet tiled floor (d) a wheel on ball bearings
37. 37.Which of these is a screw? (a) a jar lid (b) a seesaw (c) a door stopper (d) a nutcracker
38. 38.🪝 A winch has a wheel of radius 10 cm and an axle of radius 5 cm. What effort on the wheel lifts a 220 N bucket on the axle, in newtons? (ideal)
39. 39.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 1 N, a wooden plank 4 N, a carpet 5 N, sandpaper 7 N. Which surface gave the most friction? (a) sandpaper (b) ice (c) a wooden plank (d) a carpet
40. 40.💪 A force is a … (a) type of sound (b) kind of colour (c) unit of time (d) push or a pull

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