Engineering Worksheet: Part 2 Test

Engineering lesson 16: Part 2 test: forces and machines · Set 376 · 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.True or false: closing a drawer is a push. (a) True (b) False
2. 2.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 6 N, sandpaper 7 N, ice 3 N, a wooden plank 4 N. How many newtons more were needed on sandpaper than on ice?
3. 3.True or false: a wheelbarrow is a class 2 lever (load in the middle). (a) True (b) False
4. 4.💪 Is drawing up a well bucket a push or a pull? (a) a pull (b) a push
5. 5.⚙️ How many simple machines are there in the usual list? (a) 12 (b) 6 (c) 10 (d) 3
6. 6.⚖️ A lever bar balances. The load is ? N at 10 cm from the fulcrum. The effort is 60 N at 80 cm from the fulcrum on the other side. What is the missing force in newtons?
7. 7.💪 Is plucking a mango a push or a pull? (a) a pull (b) a push
8. 8.⚙️ Which simple machine is a claw hammer on a nail? (a) screw (b) lever (c) wedge (d) inclined plane
9. 9.⚖️ Along a straight bar, measured from the left end, the effort is at 30 cm, the fulcrum at 50 cm and the load at 60 cm. Which class of lever is it? (a) class 2 (b) class 1 (c) class 3
10. 10.⚙️ A screw is really … (a) a bent lever (b) a ramp wrapped round (c) a kind of wheel (d) a tiny pulley
11. 11.🪝 Fixed or movable pulley: which one is on a flagpole top? (a) a movable pulley (b) a fixed pulley
12. 12.⚖️ Along a straight bar, measured from the left end, the effort is at 0 cm, the fulcrum at 30 cm and the load at 10 cm. Which class of lever is it? (a) class 3 (b) class 1 (c) class 2
13. 13.⚖️ A lever balances when … (a) turning effects match (b) the fulcrum moves (c) the bar is short (d) both weights are equal
14. 14.True or false: a movable pulley stays in one place. (a) True (b) False
15. 15.⚖️ Turning effect = force × … (a) colour of bar (b) mass of fulcrum (c) time taken (d) distance from fulcrum
16. 16.🏋️ A longer ramp to the same height needs … (a) less effort (b) the same effort (c) more effort (d) no effort
17. 17.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 9 N, sandpaper 10 N, ice 4 N, a glass sheet 5 N. How many newtons more were needed on sandpaper than on ice?
18. 18.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 9 N, a glass sheet 1 N, a wooden plank 4 N, a carpet 8 N. Which surface gave the most friction? (a) a wooden plank (b) sandpaper (c) a carpet (d) a glass sheet
19. 19.💪 A box weighs 130 N. Taking 1 kg to weigh about 10 N, what is its mass in kilograms?
20. 20.🪝 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)
21. 21.🏋️ Can a simple machine reduce the work done? (a) no, work stays the same (b) only on Mondays (c) yes, by half (d) yes, always
22. 22.🏋️ A force of 210 N pushes a cart 6 m along the floor. How much work is done, in joules?
23. 23.🪝 A pulley system lifts a 1040 N load with an effort of 260 N. What is its mechanical advantage (MA)?
24. 24.⚖️ Which class of lever is a pair of tweezers? (a) class 2 (b) class 1 (c) class 3
25. 25.⚖️ Which class of lever is a seesaw? (a) class 1 (b) class 3 (c) class 2
26. 26.🪝 A pulley system lifts an 800 N load with an effort of 200 N. What is its mechanical advantage (MA)?
27. 27.⚖️ A lever bar balances. The load is 180 N at ? cm from the fulcrum. The effort is 360 N at 20 cm from the fulcrum on the other side. What is the missing distance in centimetres?
28. 28.🛞 Is friction helpful or a problem here: a door hinge squeaking? (a) a problem (b) helpful
29. 29.🛞 Is friction helpful or a problem here: walking without slipping? (a) helpful (b) a problem
30. 30.True or false: a rough doormat gives less friction. (a) True (b) False
31. 31.🪝 A wheel and axle is a big wheel fixed to … (a) a smaller rod (axle) (b) a sharp wedge (c) a loose rope (d) a flat ramp
32. 32.⚖️ Which class of lever is a lemon squeezer? (a) class 1 (b) class 3 (c) class 2
33. 33.🛞 Friction acts … (a) with the motion (b) only upwards (c) only on ice (d) against the motion
34. 34.⚖️ A seesaw balances. Kabir (? N) sits 1 m from the pivot on one side; Ravi (100 N) sits 4 m from the pivot on the other side. What is the missing weight in newtons?
35. 35.True or false: pressing a doorbell is a pull. (a) True (b) False
36. 36.🏋️ A force of 10 N did 30 J of work. How many metres did the object move?
37. 37.⚖️ Going along a lever from one end to the other, the order is: load, effort, fulcrum. Which class of lever is it? (a) class 1 (b) class 2 (c) class 3
38. 38.💪 Is a tug of war a push or a pull? (a) a pull (b) a push
39. 39.💪 Is pushing a trolley a push or a pull? (a) a push (b) a pull
40. 40.⚖️ A lever bar balances. The load is 150 N at 50 cm from the fulcrum. The effort is 150 N at ? cm from the fulcrum on the other side. What is the missing distance in centimetres?

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