Engineering Worksheet: Part 2 Test

Engineering lesson 16: Part 2 test: forces and machines · Set 439 · 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.True or false: a movable pulley is on a flagpole top. (a) True (b) False
2. 2.Which of these is a screw? (a) a steering wheel (b) a jar lid (c) a crowbar (d) a seesaw
3. 3.⚖️ Along a straight bar, measured from the left end, the effort is at 90 cm, the fulcrum at 30 cm and the load at 70 cm. Which class of lever is it? (a) class 3 (b) class 2 (c) class 1
4. 4.💪 Which can a force NOT do? (a) change its colour (b) start it moving (c) stop it moving (d) change its shape
5. 5.🪝 A pulley system lifts a 100 N load with an effort of 50 N. What is its mechanical advantage (MA)?
6. 6.🏋️ A 3 kg box is lifted straight up by 5 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
7. 7.🛞 Is friction helpful or a problem here: a knot holding a rope? (a) a problem (b) helpful
8. 8.True or false: a nutcracker is a class 1 lever (fulcrum in the middle). (a) True (b) False
9. 9.🏋️ A 6 kg box is lifted straight up by 1 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
10. 10.⚖️ Which class of lever is a pair of pliers? (a) class 3 (b) class 2 (c) class 1
11. 11.⚖️ Going along a lever from one end to the other, the order is: load, fulcrum, effort. Which class of lever is it? (a) class 2 (b) class 1 (c) class 3
12. 12.🏋️ A machine lifts a load of 90 N when you push with 30 N. What is its mechanical advantage (MA)?
13. 13.True or false: pressing a doorbell is a pull. (a) True (b) False
14. 14.⚖️ A seesaw balances. Arjun (520 N) sits 3 m from the pivot on one side; Asha (390 N) sits ? m from the pivot on the other side. What is the missing distance in metres?
15. 15.Which of these is a screw? (a) a wood screw (b) a wheelchair ramp (c) a truck loading ramp (d) a playground slide
16. 16.🔍 Which is the odd one out? (a) sand on a slippery path (b) skating on ice (c) a grippy rubber sole (d) a rough doormat
17. 17.⚖️ Which class of lever is a lemon squeezer? (a) class 2 (b) class 3 (c) class 1
18. 18.🔍 Which is the odd one out? (a) a crane hook block (b) a truck loading ramp (c) a window blind cord (d) a flagpole rope wheel
19. 19.💪 Is closing a drawer a push or a pull? (a) a pull (b) a push
20. 20.💪 A force is a … (a) type of sound (b) kind of colour (c) unit of time (d) push or a pull
21. 21.True or false: your forearm is a class 3 lever (effort in the middle). (a) True (b) False
22. 22.⚙️ Which simple machine is a well-bucket rope wheel? (a) pulley (b) inclined plane (c) wheel and axle (d) screw
23. 23.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 5 N, a carpet 6 N, sandpaper 10 N, a glass sheet 2 N. Which surface gave the least friction? (a) sandpaper (b) a wooden plank (c) a glass sheet (d) a carpet
24. 24.🔍 Which is the odd one out? (a) a wheelchair ramp (b) a seesaw (c) a road up a hill (d) a playground slide
25. 25.⚖️ A seesaw balances. Asha (480 N) sits 2 m from the pivot on one side; Ravi (? N) sits 3 m from the pivot on the other side. What is the missing weight in newtons?
26. 26.🛞 Is friction helpful or a problem here: walking without slipping? (a) a problem (b) helpful
27. 27.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 7 N, sandpaper 8 N, ice 2 N, a wooden plank 6 N. Which surface gave the least friction? (a) a wooden plank (b) a carpet (c) sandpaper (d) ice
28. 28.⚙️ A wedge is … (a) a bar on a pivot (b) a wheel on a rod (c) a rope on a wheel (d) two ramps back to back
29. 29.💪 Is pressing a doorbell a push or a pull? (a) a pull (b) a push
30. 30.Which of these is a wedge? (a) a seesaw (b) a bottle cap (c) a water tap handle (d) an axe blade
31. 31.⚖️ On a seesaw, a heavier child should sit … (a) on the pivot (b) anywhere (c) closer to the pivot (d) farther from the pivot
32. 32.⚖️ In a class 1 lever, what is in the middle? (a) the load (b) nothing (c) the effort (d) the fulcrum
33. 33.💪 A cart is pulled to the right with 25 N and to the left with 20 N. Which way does the net force act? (a) to the left (b) no net force (c) to the right
34. 34.True or false: oil on a squeaky hinge gives more friction. (a) True (b) False
35. 35.🏋️ Mechanical advantage (MA) = … (a) load + effort (b) load × effort (c) effort ÷ load (d) load ÷ effort
36. 36.⚖️ A seesaw balances. Kabir (? N) sits 1 m from the pivot on one side; Arjun (110 N) sits 1 m from the pivot on the other side. What is the missing weight in newtons?
37. 37.⚙️ Which simple machine is a truck loading ramp? (a) wheel and axle (b) screw (c) inclined plane (d) pulley
38. 38.💪 Two children push a box to the right, one with 20 N and the other with 20 N. What is the net (total) force on the box, in newtons?
39. 39.🪝 Fixed or movable pulley: which one stays in one place? (a) a movable pulley (b) a fixed pulley
40. 40.🏋️ An 8 kg box is lifted straight up by 1 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?

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