Engineering Worksheet: Part 2 Test

Engineering lesson 16: Part 2 test: forces and machines · Set 451 · 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.True or false: a bottle cap is a screw. (a) False (b) True
2. 2.True or false: a crowbar is a class 1 lever (fulcrum in the middle). (a) True (b) False
3. 3.⚖️ A seesaw balances. Asha (170 N) sits 4 m from the pivot on one side; Arjun (? N) sits 1 m from the pivot on the other side. What is the missing weight in newtons?
4. 4.⚖️ Going along a lever from one end to the other, the order is: load, fulcrum, effort. Which class of lever is it? (a) class 1 (b) class 2 (c) class 3
5. 5.⚖️ A seesaw balances. Meena (? N) sits 4 m from the pivot on one side; Arjun (640 N) sits 3 m from the pivot on the other side. What is the missing weight in newtons?
6. 6.⚖️ Along a straight bar, measured from the left end, the effort is at 20 cm, the fulcrum at 60 cm and the load at 50 cm. Which class of lever is it? (a) class 3 (b) class 1 (c) class 2
7. 7.💪 A bag has a mass of 38 kg. Taking 1 kg to weigh about 10 N, what is its weight in newtons?
8. 8.🏋️ A force of 20 N pushes a cart 2 m along the floor. How much work is done, in joules?
9. 9.🏋️ Pushing a crate 1 m took 300 J of work. What force was used, in newtons?
10. 10.💪 Which force is at work: an apple falls down? (a) friction (b) muscular force (c) magnetic force (d) gravity
11. 11.⚖️ A lever bar balances. The load is 80 N at ? cm from the fulcrum. The effort is 30 N at 80 cm from the fulcrum on the other side. What is the missing distance in centimetres?
12. 12.⚙️ A wedge is … (a) a bar on a pivot (b) a rope on a wheel (c) two ramps back to back (d) a wheel on a rod
13. 13.⚖️ A seesaw balances. Arjun (420 N) sits 2 m from the pivot on one side; Zoya (280 N) sits ? m from the pivot on the other side. What is the missing distance in metres?
14. 14.True or false: a movable pulley rises with the load. (a) False (b) True
15. 15.True or false: a fixed pulley only changes direction. (a) True (b) False
16. 16.🪝 A winch has a wheel of radius 8 cm and an axle of radius 4 cm. What effort on the wheel lifts a 140 N bucket on the axle, in newtons? (ideal)
17. 17.🏋️ A force of 160 N pushes a cart 1 m along the floor. How much work is done, in joules?
18. 18.🏋️ A smooth ramp is 18 m long and rises 3 m. What effort pushes a 5100 N box up it, in newtons? (ideal ramp, no friction)
19. 19.⚖️ Turning effect = force × … (a) colour of bar (b) distance from fulcrum (c) time taken (d) mass of fulcrum
20. 20.🪝 Fixed or movable pulley: which one stays in one place? (a) a movable pulley (b) a fixed pulley
21. 21.⚖️ Going along a lever from one end to the other, the order is: effort, fulcrum, load. Which class of lever is it? (a) class 2 (b) class 1 (c) class 3
22. 22.Which of these is a wheel and axle? (a) a claw hammer on a nail (b) a well winch handle (c) a wheelchair ramp (d) a well-bucket rope wheel
23. 23.⚖️ Which class of lever is a pair of kitchen tongs? (a) class 1 (b) class 3 (c) class 2
24. 24.⚖️ On a seesaw, a heavier child should sit … (a) farther from the pivot (b) closer to the pivot (c) on the pivot (d) anywhere
25. 25.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 4 N, a glass sheet 5 N, a wooden plank 9 N, a carpet 11 N. How many newtons more were needed on a carpet than on ice?
26. 26.💪 Which force pulls everything towards the Earth? (a) wind (b) friction (c) gravity (d) magnetism
27. 27.💪 Which force is at work: squeezing a lemon? (a) gravity (b) magnetic force (c) friction (d) muscular force
28. 28.True or false: a wet tiled floor gives less friction. (a) True (b) False
29. 29.🛞 Rubbing your hands fast makes them … (a) magnetic (b) cold (c) wet (d) warm
30. 30.🛞 More or less friction: a wet tiled floor? (a) less friction (b) more friction
31. 31.⚖️ Along a straight bar, measured from the left end, the effort is at 40 cm, the fulcrum at 20 cm and the load at 80 cm. Which class of lever is it? (a) class 3 (b) class 2 (c) class 1
32. 32.True or false: pushing a trolley is a pull. (a) True (b) False
33. 33.Which of these is caused by magnetic force? (a) a compass needle turns (b) lifting a school bag (c) rain falls to the ground (d) shoes grip the floor
34. 34.🏋️ A force of 310 N did 1240 J of work. How many metres did the object move?
35. 35.Which of these is an inclined plane? (a) a round doorknob (b) a wheelchair ramp (c) a chisel (d) a knife edge
36. 36.🏋️ A longer ramp to the same height needs … (a) no effort (b) less effort (c) the same effort (d) more effort
37. 37.⚖️ A lever bar balances. The load is ? N at 40 cm from the fulcrum. The effort is 320 N at 20 cm from the fulcrum on the other side. What is the missing force in newtons?
38. 38.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 5 N, a wooden plank 9 N, sandpaper 12 N, ice 1 N. Which surface gave the least friction? (a) sandpaper (b) a wooden plank (c) ice (d) a glass sheet
39. 39.True or false: a wheelbarrow is a class 1 lever (fulcrum in the middle). (a) True (b) False
40. 40.🏋️ Pushing a crate 3 m took 1500 J of work. What force was used, in newtons?

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