Engineering Worksheet: Part 2 Test

Engineering lesson 16: Part 2 test: forces and machines · Set 455 · 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.Which of these is a screw? (a) a nutcracker (b) a seesaw (c) a claw hammer on a nail (d) a jar lid
2. 2.⚖️ What is the pivot point of a lever called? (a) the effort (b) the load (c) the axle (d) the fulcrum
3. 3.🏋️ Can a simple machine reduce the work done? (a) yes, by half (b) only on Mondays (c) yes, always (d) no, work stays the same
4. 4.⚖️ A lever balances when … (a) the fulcrum moves (b) turning effects match (c) the bar is short (d) both weights are equal
5. 5.True or false: a broom when sweeping is a class 2 lever (load in the middle). (a) False (b) True
6. 6.True or false: an axe blade is a wheel and axle. (a) True (b) False
7. 7.⚖️ Which class of lever is a pair of scissors? (a) class 1 (b) class 3 (c) class 2
8. 8.⚖️ A seesaw balances. Meena (? N) sits 1 m from the pivot on one side; Arjun (170 N) sits 3 m from the pivot on the other side. What is the missing weight in newtons?
9. 9.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 1 N, a glass sheet 4 N, a wooden plank 5 N, a carpet 8 N. Which surface gave the least friction? (a) a wooden plank (b) a glass sheet (c) ice (d) a carpet
10. 10.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 8 N, sandpaper 12 N, ice 3 N, a wooden plank 4 N. Which surface gave the most friction? (a) a carpet (b) ice (c) a wooden plank (d) sandpaper
11. 11.True or false: a wheelbarrow is a class 2 lever (load in the middle). (a) False (b) True
12. 12.True or false: pulling up your socks is a push. (a) True (b) False
13. 13.True or false: a smooth steel slide gives less friction. (a) False (b) True
14. 14.🛞 How can we reduce friction in a machine? (a) oil the moving parts (b) add sand (c) press parts harder (d) make parts rough
15. 15.⚙️ A screw is really … (a) a bent lever (b) a ramp wrapped round (c) a tiny pulley (d) a kind of wheel
16. 16.True or false: a road up a hill is an inclined plane. (a) True (b) False
17. 17.⚖️ A seesaw balances. Kabir (? N) sits 2 m from the pivot on one side; Meena (200 N) sits 3 m from the pivot on the other side. What is the missing weight in newtons?
18. 18.True or false: a seesaw is a wedge. (a) False (b) True
19. 19.⚖️ Along a straight bar, measured from the left end, the effort is at 10 cm, the fulcrum at 50 cm and the load at 70 cm. Which class of lever is it? (a) class 2 (b) class 3 (c) class 1
20. 20.Which of these is caused by gravity? (a) a rolling ball slows (b) lifting a school bag (c) rain falls to the ground (d) pedalling a cycle
21. 21.💪 A cart is pulled to the right with 80 N and to the left with 70 N. Which way does the net force act? (a) no net force (b) to the right (c) to the left
22. 22.💪 A cart is pulled to the right with 25 N and to the left with 40 N. Which way does the net force act? (a) to the right (b) no net force (c) to the left
23. 23.⚖️ Along a straight bar, measured from the left end, the effort is at 70 cm, the fulcrum at 60 cm and the load at 30 cm. Which class of lever is it? (a) class 1 (b) class 2 (c) class 3
24. 24.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 7 N, a wooden plank 10 N, a carpet 14 N, ice 3 N. Which surface gave the least friction? (a) a carpet (b) a glass sheet (c) a wooden plank (d) ice
25. 25.🪝 A wheel and axle is a big wheel fixed to … (a) a smaller rod (axle) (b) a sharp wedge (c) a flat ramp (d) a loose rope
26. 26.⚖️ A seesaw balances. Ravi (390 N) sits 3 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?
27. 27.🔍 Which is the odd one out? (a) a truck loading ramp (b) a road up a hill (c) a seesaw (d) a wheelchair ramp
28. 28.True or false: a nutcracker is a wheel and axle. (a) True (b) False
29. 29.⚖️ A lever bar balances. The load is ? N at 10 cm from the fulcrum. The effort is 90 N at 100 cm from the fulcrum on the other side. What is the missing force in newtons?
30. 30.⚖️ A lever bar balances. The load is 160 N at ? cm from the fulcrum. The effort is 100 N at 80 cm from the fulcrum on the other side. What is the missing distance in centimetres?
31. 31.💪 In a tug of war, one team pulls right with 20 N and the other pulls left with 15 N. What is the size of the net force, in newtons?
32. 32.💪 A bag has a mass of 56 kg. Taking 1 kg to weigh about 10 N, what is its weight in newtons?
33. 33.⚖️ A lever bar balances. The load is 200 N at ? cm from the fulcrum. The effort is 400 N at 20 cm from the fulcrum on the other side. What is the missing distance in centimetres?
34. 34.⚙️ Which simple machine is a wood screw? (a) wheel and axle (b) wedge (c) screw (d) lever
35. 35.True or false: a bottle opener is a screw. (a) False (b) True
36. 36.True or false: plucking a mango is a pull. (a) True (b) False
37. 37.True or false: the tip of a nail is a wedge. (a) True (b) False
38. 38.⚖️ On a seesaw, a heavier child should sit … (a) farther from the pivot (b) anywhere (c) on the pivot (d) closer to the pivot
39. 39.💪 Is plucking a mango a push or a pull? (a) a pull (b) a push
40. 40.Which of these is a lever? (a) a road up a hill (b) a steering wheel (c) a claw hammer on a nail (d) a chisel

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