Engineering Worksheet: Part 2 Test

Engineering lesson 16: Part 2 test: forces and machines · Set 49 · 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 box weighs 420 N. Taking 1 kg to weigh about 10 N, what is its mass in kilograms?
2. 2.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 4 N, a glass sheet 7 N, a wooden plank 11 N, a carpet 12 N. Which surface gave the least friction? (a) a wooden plank (b) ice (c) a glass sheet (d) a carpet
3. 3.⚖️ A seesaw balances. Ravi (? N) sits 2 m from the pivot on one side; Kabir (340 N) sits 1 m from the pivot on the other side. What is the missing weight in newtons?
4. 4.Which of these is caused by gravity? (a) an apple falls down (b) a rolling ball slows (c) squeezing a lemon (d) brakes stop a bicycle
5. 5.🏋️ A longer ramp to the same height needs … (a) no effort (b) less effort (c) more effort (d) the same effort
6. 6.⚖️ To lift a heavy rock with a crowbar more easily, push … (a) on the rock (b) on the fulcrum (c) near the fulcrum (d) far from the fulcrum
7. 7.🪝 A well winch has a handle (wheel) of radius 8 cm turning an axle of radius 2 cm. What is its mechanical advantage (MA)?
8. 8.💪 Is plucking a mango a push or a pull? (a) a push (b) a pull
9. 9.🔍 Which is the odd one out? (a) a knife edge (b) the tip of a nail (c) a door stopper (d) a jar lid
10. 10.Which of these is a wheel and axle? (a) the tip of a nail (b) a chisel (c) a screw jack (d) a steering wheel
11. 11.🏋️ Pushing a crate 7 m took 2240 J of work. What force was used, in newtons?
12. 12.🛞 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 carpet 7 N, sandpaper 8 N. Which surface gave the least friction? (a) ice (b) a carpet (c) sandpaper (d) a glass sheet
13. 13.Which of these is caused by magnetic force? (a) a rolling ball slows (b) brakes stop a bicycle (c) a compass needle turns (d) an apple falls down
14. 14.🏋️ A force of 350 N did 2100 J of work. How many metres did the object move?
15. 15.Which of these is an inclined plane? (a) a jar lid (b) a well-bucket rope wheel (c) a wheelchair ramp (d) a knife edge
16. 16.True or false: a movable pulley makes you pull 2× rope. (a) True (b) False
17. 17.🏋️ A 4 kg box is lifted straight up by 5 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
18. 18.🏋️ A smooth ramp is 6 m long and rises 3 m. What effort pushes a 1800 N box up it, in newtons? (ideal ramp, no friction)
19. 19.💪 Is opening a drawer a push or a pull? (a) a push (b) a pull
20. 20.🏋️ A machine lifts a load of 250 N when you push with 50 N. What is its mechanical advantage (MA)?
21. 21.⚖️ Going along a lever from one end to the other, the order is: effort, load, fulcrum. Which class of lever is it? (a) class 2 (b) class 3 (c) class 1
22. 22.🛞 More or less friction: sand on a slippery path? (a) more friction (b) less friction
23. 23.💪 Is pushing a trolley a push or a pull? (a) a push (b) a pull
24. 24.🪝 More rope sections holding a load means … (a) less effort needed (b) more effort needed (c) the load floats (d) no change
25. 25.True or false: a claw hammer on a nail is a lever. (a) False (b) True
26. 26.💪 Which force is at work: pedalling a cycle? (a) gravity (b) magnetic force (c) friction (d) muscular force
27. 27.⚖️ On a seesaw, a heavier child should sit … (a) farther from the pivot (b) closer to the pivot (c) anywhere (d) on the pivot
28. 28.🪝 A pulley system lifts a 460 N load with an effort of 230 N. What is its mechanical advantage (MA)?
29. 29.⚖️ Along a straight bar, measured from the left end, the effort is at 70 cm, the fulcrum at 0 cm and the load at 40 cm. Which class of lever is it? (a) class 2 (b) class 3 (c) class 1
30. 30.💪 In a tug of war, one team pulls left with 55 N and the other pulls right with 20 N. What is the size of the net force, in newtons?
31. 31.⚖️ Which class of lever is a lemon squeezer? (a) class 2 (b) class 3 (c) class 1
32. 32.🏋️ A smooth ramp is 4 m long and rises 1 m. What effort pushes a 1400 N box up it, in newtons? (ideal ramp, no friction)
33. 33.⚖️ A lever bar balances. The load is ? N at 40 cm from the fulcrum. The effort is 120 N at 80 cm from the fulcrum on the other side. What is the missing force in newtons?
34. 34.🪝 A well winch has a handle (wheel) of radius 21 cm turning an axle of radius 3 cm. What is its mechanical advantage (MA)?
35. 35.⚖️ A lever balances when … (a) turning effects match (b) the fulcrum moves (c) both weights are equal (d) the bar is short
36. 36.⚖️ In a class 1 lever, what is in the middle? (a) the fulcrum (b) the effort (c) nothing (d) the load
37. 37.True or false: a fishing rod is a class 3 lever (effort in the middle). (a) False (b) True
38. 38.⚖️ A seesaw balances. Kabir (? 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?
39. 39.⚙️ Most simple machines make work easier by letting us … (a) make new energy (b) stop all friction (c) switch off gravity (d) use a smaller force
40. 40.⚙️ Which simple machine is a flagpole rope wheel? (a) wheel and axle (b) lever (c) wedge (d) pulley

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