Engineering Worksheet: Part 2 Test

Engineering lesson 16: Part 2 test: forces and machines · Set 526 · 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 bar balances. The load is ? N at 20 cm from the fulcrum. The effort is 120 N at 30 cm from the fulcrum on the other side. What is the missing force in newtons?
2. 2.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 15 N, ice 4 N, a glass sheet 8 N, a wooden plank 12 N. How many newtons more were needed on sandpaper than on ice?
3. 3.⚖️ Along a straight bar, measured from the left end, the effort is at 0 cm, the fulcrum at 40 cm and the load at 10 cm. Which class of lever is it? (a) class 3 (b) class 1 (c) class 2
4. 4.🛞 Which surface gives the MOST friction to a sliding block? (a) glass (b) polished marble (c) ice (d) sandpaper
5. 5.🏋️ A force of 220 N pushes a cart 5 m along the floor. How much work is done, in joules?
6. 6.⚙️ Which simple machine is a flagpole rope wheel? (a) wedge (b) pulley (c) inclined plane (d) screw
7. 7.True or false: a beam balance is a class 3 lever (effort in the middle). (a) False (b) True
8. 8.🏋️ Work is done when a force moves something … (a) without moving it (b) only upwards (c) through a distance (d) very slowly
9. 9.⚙️ Which simple machine is a round doorknob? (a) lever (b) inclined plane (c) wheel and axle (d) screw
10. 10.🪝 A pulley system has 4 rope sections holding up the load. To lift the load by 2 m, how many metres of rope must you pull?
11. 11.⚖️ Which class of lever is a lemon squeezer? (a) class 1 (b) class 3 (c) class 2
12. 12.⚖️ Which class of lever is a nutcracker? (a) class 2 (b) class 1 (c) class 3
13. 13.True or false: a pair of scissors is a class 1 lever (fulcrum in the middle). (a) True (b) False
14. 14.🏋️ A smooth ramp is 4 m long and rises 2 m. What effort pushes a 200 N box up it, in newtons? (ideal ramp, no friction)
15. 15.⚖️ A seesaw balances. Kabir (260 N) sits 1 m from the pivot on one side; Ravi (130 N) sits ? m from the pivot on the other side. What is the missing distance in metres?
16. 16.⚖️ Along a straight bar, measured from the left end, the effort is at 30 cm, the fulcrum at 20 cm and the load at 60 cm. Which class of lever is it? (a) class 1 (b) class 2 (c) class 3
17. 17.⚖️ A seesaw balances. Asha (? N) sits 2 m from the pivot on one side; Kabir (220 N) sits 1 m from the pivot on the other side. What is the missing weight in newtons?
18. 18.🏋️ Pushing a crate 6 m took 1020 J of work. What force was used, in newtons?
19. 19.🛞 Is friction helpful or a problem here: writing with a pencil? (a) a problem (b) helpful
20. 20.🪝 Fixed or movable pulley: which one rises with the load? (a) a fixed pulley (b) a movable pulley
21. 21.True or false: a seesaw is a class 2 lever (load in the middle). (a) False (b) True
22. 22.True or false: a wheelbarrow is a class 2 lever (load in the middle). (a) False (b) True
23. 23.🏋️ A machine lifts a load of 320 N when you push with 160 N. What is its mechanical advantage (MA)?
24. 24.💪 A box weighs 520 N. Taking 1 kg to weigh about 10 N, what is its mass in kilograms?
25. 25.⚖️ A lever balances when … (a) the fulcrum moves (b) both weights are equal (c) turning effects match (d) the bar is short
26. 26.💪 Which force is at work: a thrown ball comes down? (a) muscular force (b) friction (c) gravity (d) magnetic force
27. 27.🪝 A pulley system lifts a 320 N load with an effort of 160 N. What is its mechanical advantage (MA)?
28. 28.⚙️ A screw is really … (a) a kind of wheel (b) a bent lever (c) a ramp wrapped round (d) a tiny pulley
29. 29.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 13 N, ice 4 N, a wooden plank 8 N, a carpet 10 N. Which surface gave the least friction? (a) a wooden plank (b) sandpaper (c) a carpet (d) ice
30. 30.💪 Which force is at work: a magnet picks up pins? (a) gravity (b) muscular force (c) friction (d) magnetic force
31. 31.🔍 Which is the odd one out? (a) a well-bucket rope wheel (b) a wheelchair ramp (c) a playground slide (d) a truck loading ramp
32. 32.🪝 A well winch has a handle (wheel) of radius 8 cm turning an axle of radius 4 cm. What is its mechanical advantage (MA)?
33. 33.🏋️ A machine lifts a load of 140 N when you push with 70 N. What is its mechanical advantage (MA)?
34. 34.Which of these is a wheel and axle? (a) a round doorknob (b) a truck loading ramp (c) a claw hammer on a nail (d) a nut and bolt
35. 35.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 1 N, a glass sheet 2 N, a carpet 3 N, sandpaper 6 N. Which surface gave the most friction? (a) a carpet (b) a glass sheet (c) ice (d) sandpaper
36. 36.🪝 A winch has a wheel of radius 16 cm and an axle of radius 2 cm. What effort on the wheel lifts a 400 N bucket on the axle, in newtons? (ideal)
37. 37.🏋️ A smooth ramp is 10 m long and rises 2 m. What effort pushes a 1250 N box up it, in newtons? (ideal ramp, no friction)
38. 38.⚖️ A lever bar balances. The load is 90 N at ? cm from the fulcrum. The effort is 30 N at 30 cm from the fulcrum on the other side. What is the missing distance in centimetres?
39. 39.⚖️ Along a straight bar, measured from the left end, the effort is at 60 cm, the fulcrum at 20 cm and the load at 30 cm. Which class of lever is it? (a) class 1 (b) class 2 (c) class 3
40. 40.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 8 N, a wooden plank 10 N, a carpet 14 N, ice 4 N. Which surface gave the most friction? (a) a wooden plank (b) a carpet (c) a glass sheet (d) ice

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