Engineering Worksheet: Part 2 Test

Engineering lesson 16: Part 2 test: forces and machines · Set 825 · 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 pulley system lifts a 240 N load with an effort of 120 N. What is its mechanical advantage (MA)?
2. 2.Which of these is caused by gravity? (a) a magnet picks up pins (b) shoes grip the floor (c) a rolling ball slows (d) an apple falls down
3. 3.🛞 Friction acts … (a) against the motion (b) only on ice (c) with the motion (d) only upwards
4. 4.⚖️ 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 2 (b) class 1 (c) class 3
5. 5.🛞 More or less friction: a box pushed on carpet? (a) more friction (b) less friction
6. 6.⚖️ On a seesaw, a heavier child should sit … (a) on the pivot (b) farther from the pivot (c) closer to the pivot (d) anywhere
7. 7.🛞 Is friction helpful or a problem here: a knot holding a rope? (a) a problem (b) helpful
8. 8.⚖️ Which class of lever is a bottle opener? (a) class 1 (b) class 2 (c) class 3
9. 9.💪 Is drawing up a well bucket a push or a pull? (a) a push (b) a pull
10. 10.True or false: chalk on a gym bar gives more friction. (a) True (b) False
11. 11.Which of these is a wedge? (a) a road up a hill (b) a door stopper (c) a crowbar (d) a nut and bolt
12. 12.⚖️ Going along a lever from one end to the other, the order is: fulcrum, effort, load. Which class of lever is it? (a) class 3 (b) class 1 (c) class 2
13. 13.⚖️ A lever balances when … (a) the fulcrum moves (b) turning effects match (c) the bar is short (d) both weights are equal
14. 14.⚖️ Which class of lever is a crowbar? (a) class 2 (b) class 3 (c) class 1
15. 15.⚙️ How many simple machines are there in the usual list? (a) 12 (b) 10 (c) 6 (d) 3
16. 16.💪 In which unit do we measure force? (a) newton (N) (b) second (s) (c) litre (L) (d) metre (m)
17. 17.⚖️ A seesaw balances. Kabir (640 N) sits 3 m from the pivot on one side; Asha (480 N) sits ? m from the pivot on the other side. What is the missing distance in metres?
18. 18.🔍 Which is the odd one out? (a) sand on a slippery path (b) oil on a squeaky hinge (c) a rough doormat (d) a tyre with deep treads
19. 19.🛞 Is friction helpful or a problem here: gripping a cricket bat? (a) helpful (b) a problem
20. 20.🛞 Is friction helpful or a problem here: a door hinge squeaking? (a) a problem (b) helpful
21. 21.🔍 Which is the odd one out? (a) a wheel on ball bearings (b) skating on ice (c) a tyre with deep treads (d) a wet tiled floor
22. 22.⚖️ In a class 2 lever, what is in the middle? (a) the effort (b) the load (c) the axle (d) the fulcrum
23. 23.🪝 A well winch has a handle (wheel) of radius 16 cm turning an axle of radius 4 cm. What is its mechanical advantage (MA)?
24. 24.🔍 Which is the odd one out? (a) a wheel on ball bearings (b) a tyre with deep treads (c) sand on a slippery path (d) a grippy rubber sole
25. 25.🏋️ A smooth ramp is 10 m long and rises 2 m. What effort pushes a 2000 N box up it, in newtons? (ideal ramp, no friction)
26. 26.🪝 Fixed or movable pulley: which one makes you pull 2× rope? (a) a fixed pulley (b) a movable pulley
27. 27.True or false: a rough doormat gives more friction. (a) True (b) False
28. 28.⚙️ Which simple machine is a playground slide? (a) lever (b) wedge (c) inclined plane (d) screw
29. 29.True or false: a crowbar is a class 1 lever (fulcrum in the middle). (a) False (b) True
30. 30.⚖️ Which class of lever is a pair of scissors? (a) class 2 (b) class 1 (c) class 3
31. 31.True or false: a rough doormat gives less friction. (a) False (b) True
32. 32.⚖️ A seesaw balances. Kabir (360 N) sits 3 m from the pivot on one side; Zoya (540 N) sits ? m from the pivot on the other side. What is the missing distance in metres?
33. 33.🪝 Fixed or movable pulley: which one hangs on the rope loop? (a) a movable pulley (b) a fixed pulley
34. 34.🏋️ Work is done when a force moves something … (a) without moving it (b) only upwards (c) through a distance (d) very slowly
35. 35.True or false: hitting a cricket ball is a pull. (a) False (b) True
36. 36.🛞 More or less friction: a tyre with deep treads? (a) less friction (b) more friction
37. 37.⚖️ A seesaw balances. Kabir (200 N) sits 3 m from the pivot on one side; Asha (? N) sits 2 m from the pivot on the other side. What is the missing weight in newtons?
38. 38.🛞 Is friction helpful or a problem here: shoe soles wearing out? (a) a problem (b) helpful
39. 39.🏋️ A smooth ramp is 15 m long and rises 3 m. What effort pushes a 3000 N box up it, in newtons? (ideal ramp, no friction)
40. 40.True or false: a fishing rod is a class 3 lever (effort in the middle). (a) False (b) True

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