Engineering Worksheet: Part 2 Test

Engineering lesson 16: Part 2 test: forces and machines · Set 287 · 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 300 N at ? cm from the fulcrum. The effort is 400 N at 30 cm from the fulcrum on the other side. What is the missing distance in centimetres?
2. 2.🏋️ A smooth ramp is 3 m long and rises 1 m. What effort pushes a 2550 N box up it, in newtons? (ideal ramp, no friction)
3. 3.⚙️ A screw is really … (a) a ramp wrapped round (b) a bent lever (c) a kind of wheel (d) a tiny pulley
4. 4.🔍 Which is the odd one out? (a) a well winch handle (b) a steering wheel (c) a claw hammer on a nail (d) a round doorknob
5. 5.🏋️ Work is done when a force moves something … (a) very slowly (b) only upwards (c) without moving it (d) through a distance
6. 6.🪝 Fixed or movable pulley: which one stays in one place? (a) a fixed pulley (b) a movable pulley
7. 7.True or false: a box pushed on carpet gives more friction. (a) True (b) False
8. 8.🏋️ Pushing a crate 3 m took 510 J of work. What force was used, in newtons?
9. 9.True or false: a movable pulley stays in one place. (a) False (b) True
10. 10.🪝 A load of 100 N hangs from a pulley system in which 2 rope sections hold up the load. What effort is needed, in newtons? (ideal pulleys)
11. 11.💪 In a tug of war, one team pulls left with 25 N and the other pulls right with 15 N. What is the size of the net force, in newtons?
12. 12.True or false: a pair of pliers is a class 1 lever (fulcrum in the middle). (a) False (b) True
13. 13.🪝 A pulley system lifts a 480 N load with an effort of 120 N. What is its mechanical advantage (MA)?
14. 14.⚖️ A lever bar balances. The load is 180 N at ? cm from the fulcrum. The effort is 120 N at 30 cm from the fulcrum on the other side. What is the missing distance in centimetres?
15. 15.💪 Two children push a box to the right, one with 15 N and the other with 15 N. What is the net (total) force on the box, in newtons?
16. 16.True or false: a window blind cord is an inclined plane. (a) True (b) False
17. 17.⚖️ A seesaw balances. Meena (? N) sits 1 m from the pivot on one side; Ravi (100 N) sits 2 m from the pivot on the other side. What is the missing weight in newtons?
18. 18.🪝 A load of 1080 N hangs from a pulley system in which 4 rope sections hold up the load. What effort is needed, in newtons? (ideal pulleys)
19. 19.🛞 More or less friction: chalk on a gym bar? (a) more friction (b) less friction
20. 20.True or false: a claw hammer on a nail is a lever. (a) False (b) True
21. 21.🏋️ Mechanical advantage (MA) = … (a) load + effort (b) load × effort (c) effort ÷ load (d) load ÷ effort
22. 22.True or false: a round doorknob is a pulley. (a) True (b) False
23. 23.⚙️ Which simple machine is a bottle opener? (a) lever (b) pulley (c) wedge (d) wheel and axle
24. 24.💪 Is kicking a football a push or a pull? (a) a pull (b) a push
25. 25.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 7 N, a carpet 8 N, sandpaper 10 N, ice 3 N. Which surface gave the least friction? (a) a carpet (b) ice (c) a glass sheet (d) sandpaper
26. 26.⚖️ A lever bar balances. The load is 800 N at 20 cm from the fulcrum. The effort is 200 N at ? cm from the fulcrum on the other side. What is the missing distance in centimetres?
27. 27.⚖️ A lever bar balances. The load is 400 N at ? cm from the fulcrum. The effort is 200 N at 100 cm from the fulcrum on the other side. What is the missing distance in centimetres?
28. 28.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 1 N, a wooden plank 5 N, a carpet 9 N, sandpaper 13 N. Which surface gave the most friction? (a) ice (b) sandpaper (c) a carpet (d) a wooden plank
29. 29.🏋️ In which unit is work measured? (a) joule (J) (b) newton (N) (c) watt hour (d) metre (m)
30. 30.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 4 N, sandpaper 7 N, ice 1 N, a wooden plank 2 N. Which surface gave the most friction? (a) a wooden plank (b) ice (c) sandpaper (d) a carpet
31. 31.💪 Two children push a box to the right, one with 60 N and the other with 10 N. What is the net (total) force on the box, in newtons?
32. 32.🏋️ A smooth ramp is 6 m long and rises 1 m. What effort pushes a 300 N box up it, in newtons? (ideal ramp, no friction)
33. 33.🪝 A pulley system lifts a 560 N load with an effort of 140 N. What is its mechanical advantage (MA)?
34. 34.🛞 Which surface gives the MOST friction to a sliding block? (a) sandpaper (b) polished marble (c) ice (d) glass
35. 35.⚖️ Which class of lever is a fishing rod? (a) class 1 (b) class 2 (c) class 3
36. 36.💪 Is pulling a cart a push or a pull? (a) a pull (b) a push
37. 37.⚖️ A lever bar balances. The load is 160 N at 20 cm from the fulcrum. The effort is ? N at 80 cm from the fulcrum on the other side. What is the missing force in newtons?
38. 38.💪 Is pushing a trolley a push or a pull? (a) a pull (b) a push
39. 39.⚙️ Which simple machine is a wood screw? (a) screw (b) inclined plane (c) wedge (d) lever
40. 40.⚖️ Along a straight bar, measured from the left end, the effort is at 10 cm, the fulcrum at 20 cm and the load at 30 cm. Which class of lever is it? (a) class 2 (b) class 1 (c) class 3

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