Engineering Worksheet: Part 2 Test

Engineering lesson 16: Part 2 test: forces and machines · Set 658 · 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.🛞 More or less friction: skating on ice? (a) more friction (b) less friction
2. 2.🛞 How can we reduce friction in a machine? (a) press parts harder (b) oil the moving parts (c) add sand (d) make parts rough
3. 3.💪 Which force is at work: a compass needle turns? (a) friction (b) magnetic force (c) gravity (d) muscular force
4. 4.True or false: a rough doormat gives more friction. (a) False (b) True
5. 5.⚖️ A seesaw balances. Zoya (? N) sits 3 m from the pivot on one side; Ravi (360 N) sits 2 m from the pivot on the other side. What is the missing weight in newtons?
6. 6.True or false: pushing a swing is a push. (a) False (b) True
7. 7.Which of these is caused by gravity? (a) a magnet picks up pins (b) rubbing hands warms them (c) an apple falls down (d) a compass needle turns
8. 8.True or false: a nutcracker is a class 3 lever (effort in the middle). (a) True (b) False
9. 9.🏋️ Can a simple machine reduce the work done? (a) only on Mondays (b) yes, always (c) no, work stays the same (d) yes, by half
10. 10.⚖️ A seesaw balances. Arjun (680 N) sits 2 m from the pivot on one side; Meena (340 N) sits ? m from the pivot on the other side. What is the missing distance in metres?
11. 11.💪 In a tug of war, one team pulls left with 50 N and the other pulls right with 15 N. What is the size of the net force, in newtons?
12. 12.⚖️ Which class of lever is a lemon squeezer? (a) class 1 (b) class 2 (c) class 3
13. 13.⚖️ A seesaw balances. Ravi (? N) sits 2 m from the pivot on one side; Arjun (280 N) sits 1 m from the pivot on the other side. What is the missing weight in newtons?
14. 14.🏋️ A force of 140 N pushes a cart 7 m along the floor. How much work is done, in joules?
15. 15.⚖️ Which class of lever is a nutcracker? (a) class 3 (b) class 2 (c) class 1
16. 16.True or false: pushing a trolley is a pull. (a) False (b) True
17. 17.🛞 Is friction helpful or a problem here: writing with a pencil? (a) a problem (b) helpful
18. 18.⚖️ Which class of lever is a seesaw? (a) class 1 (b) class 2 (c) class 3
19. 19.💪 A box weighs 120 N. Taking 1 kg to weigh about 10 N, what is its mass in kilograms?
20. 20.⚖️ Along a straight bar, measured from the left end, the effort is at 10 cm, the fulcrum at 50 cm and the load at 0 cm. Which class of lever is it? (a) class 1 (b) class 2 (c) class 3
21. 21.🛞 Is friction helpful or a problem here: a door hinge squeaking? (a) helpful (b) a problem
22. 22.🪝 A winch has a wheel of radius 3 cm and an axle of radius 1 cm. What effort on the wheel lifts a 540 N bucket on the axle, in newtons? (ideal)
23. 23.🏋️ Mechanical advantage (MA) = … (a) load + effort (b) load ÷ effort (c) load × effort (d) effort ÷ load
24. 24.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 2 N, a wooden plank 3 N, a carpet 6 N, ice 1 N. How many newtons more were needed on a carpet than on ice?
25. 25.💪 A box weighs 490 N. Taking 1 kg to weigh about 10 N, what is its mass in kilograms?
26. 26.🏋️ Pushing a crate 5 m took 1550 J of work. What force was used, in newtons?
27. 27.⚙️ How many simple machines are there in the usual list? (a) 10 (b) 6 (c) 3 (d) 12
28. 28.⚖️ A lever bar balances. The load is 40 N at 50 cm from the fulcrum. The effort is 50 N at ? cm from the fulcrum on the other side. What is the missing distance in centimetres?
29. 29.🏋️ In which unit is work measured? (a) newton (N) (b) joule (J) (c) watt hour (d) metre (m)
30. 30.True or false: your forearm is a class 3 lever (effort in the middle). (a) False (b) True
31. 31.⚖️ A seesaw balances. Asha (? N) sits 3 m from the pivot on one side; Zoya (330 N) sits 3 m from the pivot on the other side. What is the missing weight in newtons?
32. 32.True or false: a tyre with deep treads gives more friction. (a) False (b) True
33. 33.⚖️ Which class of lever is a pair of scissors? (a) class 2 (b) class 1 (c) class 3
34. 34.⚖️ A seesaw balances. Kabir (110 N) sits 2 m from the pivot on one side; Ravi (? N) sits 1 m from the pivot on the other side. What is the missing weight in newtons?
35. 35.⚙️ Most simple machines make work easier by letting us … (a) switch off gravity (b) use a smaller force (c) make new energy (d) stop all friction
36. 36.True or false: a movable pulley only changes direction. (a) True (b) False
37. 37.🛞 Is friction helpful or a problem here: walking without slipping? (a) a problem (b) helpful
38. 38.🪝 Fixed or movable pulley: which one rises with the load? (a) a fixed pulley (b) a movable pulley
39. 39.🏋️ A 15 kg box is lifted straight up by 2 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
40. 40.True or false: chalk on a gym bar gives more friction. (a) True (b) False

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