Engineering Worksheet: Part 2 Test

Engineering lesson 16: Part 2 test: forces and machines · Set 889 · 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 lever balances when … (a) both weights are equal (b) the bar is short (c) turning effects match (d) the fulcrum moves
2. 2.⚖️ Which class of lever is a nutcracker? (a) class 1 (b) class 3 (c) class 2
3. 3.⚖️ Which class of lever is your forearm? (a) class 1 (b) class 2 (c) class 3
4. 4.💪 Is hitting a cricket ball a push or a pull? (a) a push (b) a pull
5. 5.🏋️ A machine lifts a load of 800 N when you push with 200 N. What is its mechanical advantage (MA)?
6. 6.⚖️ Which class of lever is a crowbar? (a) class 1 (b) class 3 (c) class 2
7. 7.Which of these is caused by gravity? (a) an apple falls down (b) rubbing hands warms them (c) a magnet picks up pins (d) squeezing a lemon
8. 8.🪝 What does a single fixed pulley change? (a) the size of the load (b) the direction of pull (c) the colour of rope (d) gravity
9. 9.🪝 A bucket weighing 200 N is lifted with a single fixed pulley at the top of a well. What effort is needed, in newtons? (ideal pulley, no friction)
10. 10.🪝 A bucket weighing 400 N is lifted with a single fixed pulley at the top of a well. What effort is needed, in newtons? (ideal pulley, no friction)
11. 11.⚖️ A seesaw balances. Ravi (? N) sits 4 m from the pivot on one side; Kabir (760 N) sits 1 m from the pivot on the other side. What is the missing weight in newtons?
12. 12.🪝 A pulley system has 3 rope sections holding up the load. To lift the load by 1 m, how many metres of rope must you pull?
13. 13.🪝 Fixed or movable pulley: which one halves the effort? (a) a fixed pulley (b) a movable pulley
14. 14.💪 Which force is at work: a magnet picks up pins? (a) gravity (b) friction (c) magnetic force (d) muscular force
15. 15.Which of these is a wheel and axle? (a) a chisel (b) a bottle opener (c) a knife edge (d) a steering wheel
16. 16.🏋️ An 18 kg box is lifted straight up by 4 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
17. 17.⚖️ A seesaw balances. Ravi (680 N) sits ? m from the pivot on one side; Arjun (510 N) sits 4 m from the pivot on the other side. What is the missing distance in metres?
18. 18.⚖️ A seesaw balances. Zoya (390 N) sits 4 m from the pivot on one side; Meena (? N) sits 3 m from the pivot on the other side. What is the missing weight in newtons?
19. 19.⚖️ A seesaw balances. Arjun (340 N) sits ? m from the pivot on one side; Asha (340 N) sits 2 m from the pivot on the other side. What is the missing distance in metres?
20. 20.True or false: a tyre with deep treads gives less friction. (a) True (b) False
21. 21.🏋️ A machine lifts a load of 200 N when you push with 100 N. What is its mechanical advantage (MA)?
22. 22.🏋️ A machine lifts a load of 20 N when you push with 10 N. What is its mechanical advantage (MA)?
23. 23.⚖️ A seesaw balances. Meena (? N) sits 2 m from the pivot on one side; Arjun (400 N) sits 4 m from the pivot on the other side. What is the missing weight in newtons?
24. 24.⚖️ On a seesaw, a heavier child should sit … (a) farther from the pivot (b) anywhere (c) closer to the pivot (d) on the pivot
25. 25.🛞 More or less friction: a smooth steel slide? (a) less friction (b) more friction
26. 26.True or false: hitting a cricket ball is a pull. (a) False (b) True
27. 27.True or false: a wheel on ball bearings gives more friction. (a) False (b) True
28. 28.🛞 More or less friction: a wet tiled floor? (a) more friction (b) less friction
29. 29.⚙️ A wedge is … (a) a wheel on a rod (b) a bar on a pivot (c) two ramps back to back (d) a rope on a wheel
30. 30.True or false: a movable pulley makes you pull 2× rope. (a) False (b) True
31. 31.🔍 Which is the odd one out? (a) a wheel on ball bearings (b) a grippy rubber sole (c) chalk on a gym bar (d) a tyre with deep treads
32. 32.🏋️ Pushing a crate 6 m took 720 J of work. What force was used, in newtons?
33. 33.💪 Two equal forces push on a box from opposite sides. They are … (a) balanced (b) doubled (c) gravity (d) unbalanced
34. 34.Which of these is caused by magnetic force? (a) rain falls to the ground (b) a fridge magnet sticks (c) squeezing a lemon (d) brakes stop a bicycle
35. 35.True or false: a movable pulley rises with the load. (a) True (b) False
36. 36.🪝 A well winch has a handle (wheel) of radius 12 cm turning an axle of radius 3 cm. What is its mechanical advantage (MA)?
37. 37.⚖️ Which class of lever is a pair of pliers? (a) class 1 (b) class 2 (c) class 3
38. 38.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 4 N, a carpet 7 N, sandpaper 8 N, ice 3 N. Which surface gave the least friction? (a) sandpaper (b) a glass sheet (c) a carpet (d) ice
39. 39.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 8 N, sandpaper 9 N, ice 1 N, a glass sheet 4 N. Which surface gave the most friction? (a) a carpet (b) a glass sheet (c) sandpaper (d) ice
40. 40.True or false: a fixed pulley makes you pull 2× rope. (a) True (b) False

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