Engineering Worksheet: Part 2 Test

Engineering lesson 16: Part 2 test: forces and machines · Set 373 · 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.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 6 N, ice 1 N, a glass sheet 2 N, a wooden plank 3 N. Which surface gave the most friction? (a) ice (b) sandpaper (c) a wooden plank (d) a glass sheet
2. 2.True or false: a wet tiled floor gives more friction. (a) False (b) True
3. 3.💪 In a tug of war, one team pulls left with 75 N and the other pulls right with 15 N. What is the size of the net force, in newtons?
4. 4.💪 Which force is at work: an apple falls down? (a) friction (b) muscular force (c) gravity (d) magnetic force
5. 5.💪 A box weighs 510 N. Taking 1 kg to weigh about 10 N, what is its mass in kilograms?
6. 6.⚖️ A lever bar balances. The load is 280 N at ? cm from the fulcrum. The effort is 120 N at 70 cm from the fulcrum on the other side. What is the missing distance in centimetres?
7. 7.💪 A box weighs 530 N. Taking 1 kg to weigh about 10 N, what is its mass in kilograms?
8. 8.🪝 Fixed or movable pulley: which one only changes direction? (a) a movable pulley (b) a fixed pulley
9. 9.💪 A box weighs 410 N. Taking 1 kg to weigh about 10 N, what is its mass in kilograms?
10. 10.⚖️ Which class of lever is a pair of tweezers? (a) class 2 (b) class 3 (c) class 1
11. 11.🏋️ A smooth ramp is 4 m long and rises 1 m. What effort pushes a 600 N box up it, in newtons? (ideal ramp, no friction)
12. 12.💪 Is pushing a trolley a push or a pull? (a) a push (b) a pull
13. 13.⚖️ A seesaw balances. Asha (130 N) sits 4 m from the pivot on one side; Zoya (520 N) sits ? m from the pivot on the other side. What is the missing distance in metres?
14. 14.🪝 Fixed or movable pulley: which one makes you pull 2× rope? (a) a fixed pulley (b) a movable pulley
15. 15.⚖️ Along a straight bar, measured from the left end, the effort is at 60 cm, the fulcrum at 30 cm and the load at 50 cm. Which class of lever is it? (a) class 3 (b) class 1 (c) class 2
16. 16.⚖️ A seesaw balances. Kabir (? N) sits 2 m from the pivot on one side; Arjun (360 N) sits 3 m from the pivot on the other side. What is the missing weight in newtons?
17. 17.⚖️ Along a straight bar, measured from the left end, the effort is at 60 cm, the fulcrum at 30 cm and the load at 40 cm. Which class of lever is it? (a) class 1 (b) class 3 (c) class 2
18. 18.🏋️ Work is done when a force moves something … (a) without moving it (b) through a distance (c) only upwards (d) very slowly
19. 19.⚙️ Most simple machines make work easier by letting us … (a) use a smaller force (b) stop all friction (c) switch off gravity (d) make new energy
20. 20.🏋️ A machine lifts a load of 270 N when you push with 90 N. What is its mechanical advantage (MA)?
21. 21.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 2 N, a carpet 3 N, sandpaper 6 N, ice 1 N. How many newtons more were needed on sandpaper than on ice?
22. 22.⚖️ A seesaw balances. Zoya (480 N) sits 4 m from the pivot on one side; Meena (? N) sits 3 m from the pivot on the other side. What is the missing weight in newtons?
23. 23.⚖️ Going along a lever from one end to the other, the order is: load, fulcrum, effort. Which class of lever is it? (a) class 3 (b) class 1 (c) class 2
24. 24.⚖️ A lever bar balances. The load is 250 N at 50 cm from the fulcrum. The effort is ? N at 50 cm from the fulcrum on the other side. What is the missing force in newtons?
25. 25.⚙️ Which simple machine is a crane hook block? (a) pulley (b) wedge (c) inclined plane (d) wheel and axle
26. 26.True or false: a rough doormat gives less friction. (a) False (b) True
27. 27.🏋️ A smooth ramp is 3 m long and rises 1 m. What effort pushes a 150 N box up it, in newtons? (ideal ramp, no friction)
28. 28.💪 Two equal forces push on a box from opposite sides. They are … (a) gravity (b) doubled (c) balanced (d) unbalanced
29. 29.⚖️ On a seesaw, a heavier child should sit … (a) closer to the pivot (b) farther from the pivot (c) on the pivot (d) anywhere
30. 30.🪝 A well winch has a handle (wheel) of radius 16 cm turning an axle of radius 4 cm. What is its mechanical advantage (MA)?
31. 31.🛞 Is friction helpful or a problem here: brakes stopping a cycle? (a) helpful (b) a problem
32. 32.🛞 More or less friction: oil on a squeaky hinge? (a) more friction (b) less friction
33. 33.True or false: a movable pulley rises with the load. (a) False (b) True
34. 34.Which of these is a wheel and axle? (a) a well-bucket rope wheel (b) a round doorknob (c) a door stopper (d) a wood screw
35. 35.⚖️ A lever bar balances. The load is 60 N at 40 cm from the fulcrum. The effort is ? N at 30 cm from the fulcrum on the other side. What is the missing force in newtons?
36. 36.🏋️ 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?
37. 37.⚖️ Along a straight bar, measured from the left end, the effort is at 40 cm, the fulcrum at 50 cm and the load at 30 cm. Which class of lever is it? (a) class 3 (b) class 2 (c) class 1
38. 38.🏋️ A force of 140 N did 1260 J of work. How many metres did the object move?
39. 39.🏋️ A machine lifts a load of 480 N when you push with 160 N. What is its mechanical advantage (MA)?
40. 40.True or false: a broom when sweeping is a class 3 lever (effort in the middle). (a) True (b) False

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