Engineering Worksheet: Part 2 Test

Engineering lesson 16: Part 2 test: forces and machines · Set 812 · 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 force is at work: pedalling a cycle? (a) muscular force (b) friction (c) gravity (d) magnetic force
2. 2.⚖️ Which class of lever is a crowbar? (a) class 1 (b) class 3 (c) class 2
3. 3.💪 Is hitting a cricket ball a push or a pull? (a) a pull (b) a push
4. 4.🔍 Which is the odd one out? (a) a round doorknob (b) a water tap handle (c) a steering wheel (d) a crane hook block
5. 5.⚖️ A lever bar balances. The load is ? N at 30 cm from the fulcrum. The effort is 180 N at 20 cm from the fulcrum on the other side. What is the missing force in newtons?
6. 6.💪 A bag has a mass of 18 kg. Taking 1 kg to weigh about 10 N, what is its weight in newtons?
7. 7.Which of these is a wedge? (a) a road up a hill (b) a chisel (c) a wood screw (d) a truck loading ramp
8. 8.⚖️ A lever bar balances. The load is 180 N at 20 cm from the fulcrum. The effort is 180 N at ? cm from the fulcrum on the other side. What is the missing distance in centimetres?
9. 9.💪 A bag has a mass of 17 kg. Taking 1 kg to weigh about 10 N, what is its weight in newtons?
10. 10.True or false: a rough doormat gives less friction. (a) True (b) False
11. 11.⚖️ On a seesaw, a heavier child should sit … (a) on the pivot (b) farther from the pivot (c) closer to the pivot (d) anywhere
12. 12.💪 Two equal forces push on a box from opposite sides. They are … (a) balanced (b) doubled (c) unbalanced (d) gravity
13. 13.True or false: a lemon squeezer is a class 3 lever (effort in the middle). (a) True (b) False
14. 14.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 9 N, sandpaper 12 N, ice 1 N, a glass sheet 5 N. Which surface gave the most friction? (a) ice (b) a glass sheet (c) a carpet (d) sandpaper
15. 15.⚖️ Which class of lever is a pair of kitchen tongs? (a) class 2 (b) class 1 (c) class 3
16. 16.Which of these is an inclined plane? (a) a playground slide (b) a seesaw (c) a well-bucket rope wheel (d) a nut and bolt
17. 17.🪝 A well winch has a handle (wheel) of radius 7 cm turning an axle of radius 1 cm. What is its mechanical advantage (MA)?
18. 18.⚖️ A seesaw balances. Meena (120 N) sits ? m from the pivot on one side; Asha (240 N) sits 1 m from the pivot on the other side. What is the missing distance in metres?
19. 19.⚖️ Which class of lever is a seesaw? (a) class 2 (b) class 3 (c) class 1
20. 20.True or false: a bottle opener is a class 2 lever (load in the middle). (a) False (b) True
21. 21.🛞 Which surface gives the MOST friction to a sliding block? (a) sandpaper (b) ice (c) polished marble (d) glass
22. 22.⚖️ A seesaw balances. Meena (360 N) sits 1 m from the pivot on one side; Asha (? N) sits 3 m from the pivot on the other side. What is the missing weight in newtons?
23. 23.⚖️ A lever bar balances. The load is ? N at 40 cm from the fulcrum. The effort is 320 N at 40 cm from the fulcrum on the other side. What is the missing force in newtons?
24. 24.🪝 More rope sections holding a load means … (a) less effort needed (b) more effort needed (c) the load floats (d) no change
25. 25.🪝 A bucket weighing 270 N is lifted with a single fixed pulley at the top of a well. What effort is needed, in newtons? (ideal pulley, no friction)
26. 26.True or false: a bottle opener is a pulley. (a) False (b) True
27. 27.True or false: a wheel on ball bearings gives more friction. (a) True (b) False
28. 28.⚖️ Turning effect = force × … (a) colour of bar (b) time taken (c) mass of fulcrum (d) distance from fulcrum
29. 29.⚙️ Which simple machine is a wheelchair ramp? (a) screw (b) inclined plane (c) wheel and axle (d) pulley
30. 30.💪 Which can a force NOT do? (a) change its colour (b) change its shape (c) start it moving (d) stop it moving
31. 31.⚖️ Which class of lever is a broom when sweeping? (a) class 2 (b) class 1 (c) class 3
32. 32.🪝 A bucket weighing 60 N is lifted with a single fixed pulley at the top of a well. What effort is needed, in newtons? (ideal pulley, no friction)
33. 33.⚖️ To lift a heavy rock with a crowbar more easily, push … (a) near the fulcrum (b) far from the fulcrum (c) on the fulcrum (d) on the rock
34. 34.⚖️ 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 2 (c) class 1
35. 35.💪 Which force is at work: rain falls to the ground? (a) gravity (b) friction (c) magnetic force (d) muscular force
36. 36.⚖️ A lever bar balances. The load is 400 N at ? cm from the fulcrum. The effort is 50 N at 80 cm from the fulcrum on the other side. What is the missing distance in centimetres?
37. 37.💪 Is a tug of war a push or a pull? (a) a pull (b) a push
38. 38.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 4 N, a wooden plank 5 N, a carpet 9 N, sandpaper 11 N. Which surface gave the most friction? (a) a carpet (b) ice (c) sandpaper (d) a wooden plank
39. 39.🏋️ Mechanical advantage (MA) = … (a) effort ÷ load (b) load ÷ effort (c) load × effort (d) load + effort
40. 40.⚖️ Along a straight bar, measured from the left end, the effort is at 0 cm, the fulcrum at 10 cm and the load at 40 cm. Which class of lever is it? (a) class 2 (b) class 3 (c) class 1

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