Engineering Worksheet: Part 2 Test

Engineering lesson 16: Part 2 test: forces and machines · Set 437 · 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.⚖️ Along a straight bar, measured from the left end, the effort is at 0 cm, the fulcrum at 30 cm and the load at 60 cm. Which class of lever is it? (a) class 3 (b) class 1 (c) class 2
2. 2.🪝 A bucket weighing 450 N is lifted with a single fixed pulley at the top of a well. What effort is needed, in newtons? (ideal pulley, no friction)
3. 3.🛞 How can we reduce friction in a machine? (a) oil the moving parts (b) add sand (c) make parts rough (d) press parts harder
4. 4.🏋️ A smooth ramp is 15 m long and rises 3 m. What effort pushes a 1500 N box up it, in newtons? (ideal ramp, no friction)
5. 5.🛞 Which surface gives the MOST friction to a sliding block? (a) ice (b) glass (c) polished marble (d) sandpaper
6. 6.🪝 A wheel and axle is a big wheel fixed to … (a) a loose rope (b) a sharp wedge (c) a flat ramp (d) a smaller rod (axle)
7. 7.🔍 Which is the odd one out? (a) a well winch handle (b) a steering wheel (c) a water tap handle (d) a road up a hill
8. 8.🪝 Fixed or movable pulley: which one needs effort = load? (a) a movable pulley (b) a fixed pulley
9. 9.True or false: a rough doormat gives more friction. (a) True (b) False
10. 10.⚖️ Along a straight bar, measured from the left end, the effort is at 40 cm, the fulcrum at 10 cm and the load at 20 cm. Which class of lever is it? (a) class 1 (b) class 3 (c) class 2
11. 11.🏋️ An 11 kg box is lifted straight up by 2 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
12. 12.True or false: closing a drawer is a push. (a) True (b) False
13. 13.⚖️ Along a straight bar, measured from the left end, the effort is at 0 cm, the fulcrum at 40 cm and the load at 20 cm. Which class of lever is it? (a) class 1 (b) class 3 (c) class 2
14. 14.⚖️ A lever bar balances. The load is 280 N at ? cm from the fulcrum. The effort is 210 N at 40 cm from the fulcrum on the other side. What is the missing distance in centimetres?
15. 15.🏋️ A force of 130 N pushes a cart 9 m along the floor. How much work is done, in joules?
16. 16.Which of these is caused by friction? (a) an apple falls down (b) a river flows downhill (c) rain falls to the ground (d) a rolling ball slows
17. 17.🪝 A pulley system lifts a 200 N load with an effort of 100 N. What is its mechanical advantage (MA)?
18. 18.🏋️ A force of 110 N pushes a cart 1 m along the floor. How much work is done, in joules?
19. 19.⚖️ Which class of lever is a wheelbarrow? (a) class 3 (b) class 1 (c) class 2
20. 20.💪 A force is a … (a) kind of colour (b) type of sound (c) push or a pull (d) unit of time
21. 21.⚖️ To lift a heavy rock with a crowbar more easily, push … (a) far from the fulcrum (b) near the fulcrum (c) on the fulcrum (d) on the rock
22. 22.True or false: a smooth steel slide gives more friction. (a) True (b) False
23. 23.⚖️ A seesaw balances. Kabir (? N) sits 4 m from the pivot on one side; Zoya (400 N) sits 4 m from the pivot on the other side. What is the missing weight in newtons?
24. 24.True or false: a flagpole rope wheel is a pulley. (a) True (b) False
25. 25.⚖️ Which class of lever is a pair of kitchen tongs? (a) class 2 (b) class 3 (c) class 1
26. 26.⚖️ A lever bar balances. The load is 210 N at ? cm from the fulcrum. The effort is 150 N at 70 cm from the fulcrum on the other side. What is the missing distance in centimetres?
27. 27.True or false: a fixed pulley stays in one place. (a) False (b) True
28. 28.🪝 A well winch has a handle (wheel) of radius 40 cm turning an axle of radius 5 cm. What is its mechanical advantage (MA)?
29. 29.🪝 Fixed or movable pulley: which one is on a flagpole top? (a) a movable pulley (b) a fixed pulley
30. 30.True or false: a well-bucket rope wheel is a pulley. (a) True (b) False
31. 31.⚖️ Along a straight bar, measured from the left end, the effort is at 40 cm, the fulcrum at 0 cm and the load at 60 cm. Which class of lever is it? (a) class 2 (b) class 1 (c) class 3
32. 32.🏋️ In which unit is work measured? (a) watt hour (b) joule (J) (c) newton (N) (d) metre (m)
33. 33.⚖️ Which class of lever is a bottle opener? (a) class 3 (b) class 1 (c) class 2
34. 34.🪝 A well winch has a handle (wheel) of radius 10 cm turning an axle of radius 2 cm. What is its mechanical advantage (MA)?
35. 35.⚖️ Which class of lever is a pair of scissors? (a) class 2 (b) class 1 (c) class 3
36. 36.True or false: a rough doormat gives less friction. (a) True (b) False
37. 37.⚖️ A seesaw balances. Ravi (240 N) sits 4 m from the pivot on one side; Kabir (? N) sits 2 m from the pivot on the other side. What is the missing weight in newtons?
38. 38.True or false: a movable pulley halves the effort. (a) True (b) False
39. 39.🔍 Which is the odd one out? (a) a tyre with deep treads (b) sand on a slippery path (c) skating on ice (d) a box pushed on carpet
40. 40.🏋️ Pushing a crate 3 m took 540 J of work. What force was used, in newtons?

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