Engineering Worksheet: Part 2 Test

Engineering lesson 16: Part 2 test: forces and machines · Set 452 · 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.⚖️ Along a straight bar, measured from the left end, the effort is at 30 cm, the fulcrum at 10 cm and the load at 40 cm. Which class of lever is it? (a) class 2 (b) class 3 (c) class 1
2. 2.⚖️ Which class of lever is a lemon squeezer? (a) class 3 (b) class 1 (c) class 2
3. 3.🏋️ Pushing a crate 3 m took 480 J of work. What force was used, in newtons?
4. 4.🏋️ A machine lifts a load of 120 N when you push with 30 N. What is its mechanical advantage (MA)?
5. 5.💪 Is pushing a trolley a push or a pull? (a) a pull (b) a push
6. 6.🏋️ A force of 230 N did 1380 J of work. How many metres did the object move?
7. 7.🪝 A pulley system has 3 rope sections holding up the load. To lift the load by 5 m, how many metres of rope must you pull?
8. 8.True or false: a seesaw is a class 2 lever (load in the middle). (a) False (b) True
9. 9.⚖️ A seesaw balances. Zoya (110 N) sits 1 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?
10. 10.🔍 Which is the odd one out? (a) a bottle cap (b) a jar lid (c) a wood screw (d) a claw hammer on a nail
11. 11.🛞 More or less friction: a wheel on ball bearings? (a) less friction (b) more friction
12. 12.⚖️ Which class of lever is a pair of kitchen tongs? (a) class 1 (b) class 3 (c) class 2
13. 13.🏋️ An 18 kg box is lifted straight up by 5 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
14. 14.🔍 Which is the odd one out? (a) a screw jack (b) a playground slide (c) a nut and bolt (d) a bottle cap
15. 15.🏋️ A 3 kg box is lifted straight up by 4 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
16. 16.💪 Is closing a drawer a push or a pull? (a) a push (b) a pull
17. 17.🏋️ A machine lifts a load of 80 N when you push with 40 N. What is its mechanical advantage (MA)?
18. 18.🏋️ A smooth ramp is 9 m long and rises 3 m. What effort pushes a 3000 N box up it, in newtons? (ideal ramp, no friction)
19. 19.⚖️ A lever bar balances. The load is 540 N at 20 cm from the fulcrum. The effort is ? N at 90 cm from the fulcrum on the other side. What is the missing force in newtons?
20. 20.🪝 Fixed or movable pulley: which one is on a flagpole top? (a) a movable pulley (b) a fixed pulley
21. 21.Which of these is a lever? (a) a steering wheel (b) the tip of a nail (c) a seesaw (d) a playground slide
22. 22.⚖️ A seesaw balances. Asha (180 N) sits 3 m from the pivot on one side; Ravi (540 N) sits ? m from the pivot on the other side. What is the missing distance in metres?
23. 23.True or false: a bottle cap is a wheel and axle. (a) True (b) False
24. 24.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 8 N, a carpet 10 N, sandpaper 14 N, a glass sheet 4 N. Which surface gave the least friction? (a) sandpaper (b) a glass sheet (c) a wooden plank (d) a carpet
25. 25.🛞 Friction acts … (a) only upwards (b) with the motion (c) only on ice (d) against the motion
26. 26.⚖️ A seesaw balances. Asha (440 N) sits 3 m from the pivot on one side; Kabir (? N) sits 4 m from the pivot on the other side. What is the missing weight in newtons?
27. 27.True or false: a fixed pulley hangs on the rope loop. (a) True (b) False
28. 28.🪝 A well winch has a handle (wheel) of radius 30 cm turning an axle of radius 5 cm. What is its mechanical advantage (MA)?
29. 29.🏋️ Pushing a crate 1 m took 310 J of work. What force was used, in newtons?
30. 30.True or false: a lemon squeezer is a class 3 lever (effort in the middle). (a) False (b) True
31. 31.💪 A cart is pulled to the right with 70 N and to the left with 60 N. Which way does the net force act? (a) to the right (b) no net force (c) to the left
32. 32.🪝 A pulley system lifts a 520 N load with an effort of 130 N. What is its mechanical advantage (MA)?
33. 33.⚖️ A seesaw balances. Zoya (390 N) sits 3 m from the pivot on one side; Kabir (? N) sits 3 m from the pivot on the other side. What is the missing weight in newtons?
34. 34.⚖️ A seesaw balances. Zoya (180 N) sits ? m from the pivot on one side; Arjun (360 N) sits 1 m from the pivot on the other side. What is the missing distance in metres?
35. 35.⚖️ A lever bar balances. The load is 140 N at ? cm from the fulcrum. The effort is 60 N at 70 cm from the fulcrum on the other side. What is the missing distance in centimetres?
36. 36.💪 A force is a … (a) type of sound (b) kind of colour (c) unit of time (d) push or a pull
37. 37.True or false: a round doorknob is a lever. (a) True (b) False
38. 38.True or false: a smooth steel slide gives more friction. (a) True (b) False
39. 39.🪝 A winch has a wheel of radius 8 cm and an axle of radius 2 cm. What effort on the wheel lifts a 760 N bucket on the axle, in newtons? (ideal)
40. 40.💪 A cart is pulled to the right with 80 N and to the left with 80 N. Which way does the net force act? (a) to the right (b) to the left (c) no net force

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