Engineering Worksheet: Part 2 Test

Engineering lesson 16: Part 2 test: forces and machines · Set 763 · 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) a problem (b) helpful
2. 2.🪝 A well winch has a handle (wheel) of radius 9 cm turning an axle of radius 3 cm. What is its mechanical advantage (MA)?
3. 3.💪 In which unit do we measure force? (a) metre (m) (b) litre (L) (c) newton (N) (d) second (s)
4. 4.⚖️ A lever bar balances. The load is 120 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?
5. 5.💪 In a tug of war, one team pulls right with 50 N and the other pulls left with 40 N. What is the size of the net force, in newtons?
6. 6.💪 Two children push a box to the right, one with 75 N and the other with 20 N. What is the net (total) force on the box, in newtons?
7. 7.🪝 A pulley system lifts a 280 N load with an effort of 70 N. What is its mechanical advantage (MA)?
8. 8.⚖️ A seesaw balances. Kabir (280 N) sits 2 m from the pivot on one side; Ravi (? N) sits 2 m from the pivot on the other side. What is the missing weight in newtons?
9. 9.🏋️ A 7 kg box is lifted straight up by 2 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
10. 10.⚙️ How many simple machines are there in the usual list? (a) 12 (b) 3 (c) 10 (d) 6
11. 11.True or false: a smooth steel slide gives more friction. (a) False (b) True
12. 12.⚙️ Which simple machine is a round doorknob? (a) wheel and axle (b) pulley (c) inclined plane (d) lever
13. 13.🏋️ A machine lifts a load of 1140 N when you push with 190 N. What is its mechanical advantage (MA)?
14. 14.⚖️ Which class of lever is a pair of scissors? (a) class 3 (b) class 2 (c) class 1
15. 15.Which of these is caused by muscular force? (a) a river flows downhill (b) a compass needle turns (c) brakes stop a bicycle (d) squeezing a lemon
16. 16.⚖️ In a class 1 lever, what is in the middle? (a) the load (b) the fulcrum (c) nothing (d) the effort
17. 17.True or false: drawing up a well bucket is a push. (a) False (b) True
18. 18.🪝 A pulley system has 3 rope sections holding up the load. To lift the load by 3 m, how many metres of rope must you pull?
19. 19.🪝 Fixed or movable pulley: which one only changes direction? (a) a movable pulley (b) a fixed pulley
20. 20.⚖️ A seesaw balances. Kabir (760 N) sits ? m from the pivot on one side; Asha (380 N) sits 4 m from the pivot on the other side. What is the missing distance in metres?
21. 21.💪 Two equal forces push on a box from opposite sides. They are … (a) gravity (b) unbalanced (c) doubled (d) balanced
22. 22.⚖️ A seesaw balances. Arjun (? N) sits 1 m from the pivot on one side; Ravi (120 N) sits 2 m from the pivot on the other side. What is the missing weight in newtons?
23. 23.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 7 N, a wooden plank 8 N, sandpaper 10 N, ice 4 N. Which surface gave the most friction? (a) sandpaper (b) a glass sheet (c) ice (d) a wooden plank
24. 24.⚖️ A seesaw balances. Ravi (180 N) sits ? m from the pivot on one side; Asha (180 N) sits 1 m from the pivot on the other side. What is the missing distance in metres?
25. 25.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 6 N, a carpet 7 N, sandpaper 9 N, a glass sheet 2 N. Which surface gave the most friction? (a) a glass sheet (b) sandpaper (c) a carpet (d) a wooden plank
26. 26.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 5 N, sandpaper 6 N, a glass sheet 1 N, a wooden plank 4 N. Which surface gave the most friction? (a) a carpet (b) a wooden plank (c) a glass sheet (d) sandpaper
27. 27.True or false: a fixed pulley halves the effort. (a) False (b) True
28. 28.True or false: a tyre with deep treads gives less friction. (a) False (b) True
29. 29.Which of these is caused by friction? (a) a rolling ball slows (b) lifting a school bag (c) a magnet picks up pins (d) pedalling a cycle
30. 30.🏋️ A force of 470 N did 2350 J of work. How many metres did the object move?
31. 31.🪝 A winch has a wheel of radius 9 cm and an axle of radius 3 cm. What effort on the wheel lifts a 570 N bucket on the axle, in newtons? (ideal)
32. 32.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 4 N, a wooden plank 5 N, a carpet 9 N, sandpaper 10 N. Which surface gave the least friction? (a) a glass sheet (b) sandpaper (c) a wooden plank (d) a carpet
33. 33.⚙️ A wedge is … (a) a bar on a pivot (b) a wheel on a rod (c) two ramps back to back (d) a rope on a wheel
34. 34.⚙️ Which simple machine is a well winch handle? (a) inclined plane (b) wedge (c) lever (d) wheel and axle
35. 35.🏋️ A force of 180 N did 360 J of work. How many metres did the object move?
36. 36.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 9 N, ice 1 N, a wooden plank 2 N, a carpet 6 N. Which surface gave the most friction? (a) ice (b) a wooden plank (c) a carpet (d) sandpaper
37. 37.⚖️ Along a straight bar, measured from the left end, the effort is at 60 cm, the fulcrum at 50 cm and the load at 20 cm. Which class of lever is it? (a) class 2 (b) class 1 (c) class 3
38. 38.💪 Which can a force NOT do? (a) change its shape (b) stop it moving (c) change its colour (d) start it moving
39. 39.💪 Is opening a drawer a push or a pull? (a) a push (b) a pull
40. 40.Which of these is caused by friction? (a) a river flows downhill (b) brakes stop a bicycle (c) lifting a school bag (d) a compass needle turns

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