Engineering Worksheet: Part 2 Test

Engineering lesson 16: Part 2 test: forces and machines · Set 836 · 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 wedge is … (a) a rope on a wheel (b) two ramps back to back (c) a bar on a pivot (d) a wheel on a rod
2. 2.True or false: a lemon squeezer is a class 3 lever (effort in the middle). (a) False (b) True
3. 3.🏋️ A force of 240 N pushes a cart 8 m along the floor. How much work is done, in joules?
4. 4.Which of these is a screw? (a) a bottle cap (b) a nutcracker (c) a chisel (d) a knife edge
5. 5.⚖️ A lever bar balances. The load is ? N at 40 cm from the fulcrum. The effort is 160 N at 80 cm from the fulcrum on the other side. What is the missing force in newtons?
6. 6.True or false: a bottle opener is a wedge. (a) True (b) False
7. 7.🛞 More or less friction: powder on a carrom board? (a) less friction (b) more friction
8. 8.⚖️ A lever bar balances. The load is 300 N at 40 cm from the fulcrum. The effort is ? N at 50 cm from the fulcrum on the other side. What is the missing force in newtons?
9. 9.🪝 A well winch has a handle (wheel) of radius 4 cm turning an axle of radius 1 cm. What is its mechanical advantage (MA)?
10. 10.⚖️ On a seesaw, a heavier child should sit … (a) on the pivot (b) anywhere (c) farther from the pivot (d) closer to the pivot
11. 11.⚖️ Which class of lever is your forearm? (a) class 2 (b) class 1 (c) class 3
12. 12.⚖️ A seesaw balances. Arjun (190 N) sits ? m from the pivot on one side; Meena (760 N) sits 1 m from the pivot on the other side. What is the missing distance in metres?
13. 13.🪝 What does a single fixed pulley change? (a) the size of the load (b) the colour of rope (c) the direction of pull (d) gravity
14. 14.⚖️ A seesaw balances. Zoya (220 N) sits 3 m from the pivot on one side; Meena (? N) sits 2 m from the pivot on the other side. What is the missing weight in newtons?
15. 15.🛞 More or less friction: oil on a squeaky hinge? (a) more friction (b) less friction
16. 16.🪝 Fixed or movable pulley: which one stays in one place? (a) a movable pulley (b) a fixed pulley
17. 17.⚖️ Along a straight bar, measured from the left end, the effort is at 60 cm, the fulcrum at 10 cm and the load at 50 cm. Which class of lever is it? (a) class 3 (b) class 2 (c) class 1
18. 18.True or false: sand on a slippery path gives less friction. (a) False (b) True
19. 19.🪝 A bucket weighing 270 N is lifted with a single fixed pulley at the top of a well. What effort is needed, in newtons? (ideal pulley, no friction)
20. 20.True or false: pushing a swing is a push. (a) False (b) True
21. 21.⚖️ A seesaw balances. Arjun (? N) sits 1 m from the pivot on one side; Ravi (160 N) sits 4 m from the pivot on the other side. What is the missing weight in newtons?
22. 22.🏋️ A force of 80 N pushes a cart 2 m along the floor. How much work is done, in joules?
23. 23.Which of these is caused by friction? (a) an apple falls down (b) squeezing a lemon (c) a rolling ball slows (d) a magnet picks up pins
24. 24.🪝 A well winch has a handle (wheel) of radius 15 cm turning an axle of radius 3 cm. What is its mechanical advantage (MA)?
25. 25.🪝 A winch has a wheel of radius 10 cm and an axle of radius 5 cm. What effort on the wheel lifts a 340 N bucket on the axle, in newtons? (ideal)
26. 26.⚖️ Turning effect = force × … (a) time taken (b) mass of fulcrum (c) distance from fulcrum (d) colour of bar
27. 27.True or false: a well winch handle is a wedge. (a) True (b) False
28. 28.🔍 Which is the odd one out? (a) a grippy rubber sole (b) chalk on a gym bar (c) oil on a squeaky hinge (d) a box pushed on carpet
29. 29.⚖️ A lever bar balances. The load is 600 N at ? cm from the fulcrum. The effort is 300 N at 60 cm from the fulcrum on the other side. What is the missing distance in centimetres?
30. 30.True or false: a pair of tweezers is a class 3 lever (effort in the middle). (a) False (b) True
31. 31.True or false: a movable pulley makes you pull 2× rope. (a) False (b) True
32. 32.True or false: a crowbar is a class 3 lever (effort in the middle). (a) True (b) False
33. 33.🏋️ A machine lifts a load of 100 N when you push with 50 N. What is its mechanical advantage (MA)?
34. 34.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 1 N, a wooden plank 3 N, a carpet 6 N, sandpaper 7 N. How many newtons more were needed on sandpaper than on ice?
35. 35.⚖️ A lever bar balances. The load is 560 N at ? cm from the fulcrum. The effort is 280 N at 80 cm from the fulcrum on the other side. What is the missing distance in centimetres?
36. 36.⚖️ A lever bar balances. The load is 120 N at 30 cm from the fulcrum. The effort is 180 N at ? cm from the fulcrum on the other side. What is the missing distance in centimetres?
37. 37.🪝 Fixed or movable pulley: which one is on a flagpole top? (a) a movable pulley (b) a fixed pulley
38. 38.💪 Is drawing up a well bucket a push or a pull? (a) a pull (b) a push
39. 39.🏋️ Pushing a crate 8 m took 880 J of work. What force was used, in newtons?
40. 40.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 3 N, a glass sheet 6 N, a wooden plank 8 N, sandpaper 9 N. Which surface gave the most friction? (a) a glass sheet (b) sandpaper (c) ice (d) a wooden plank

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