Engineering Worksheet: Part 2 Test

Engineering lesson 16: Part 2 test: forces and machines · Set 781 · 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 class of lever is a beam balance? (a) class 2 (b) class 1 (c) class 3
2. 2.True or false: sand on a slippery path gives less friction. (a) True (b) False
3. 3.⚖️ Along a straight bar, measured from the left end, the effort is at 50 cm, the fulcrum at 70 cm and the load at 10 cm. Which class of lever is it? (a) class 2 (b) class 3 (c) class 1
4. 4.🪝 What does a single fixed pulley change? (a) the direction of pull (b) the size of the load (c) the colour of rope (d) gravity
5. 5.🛞 Is friction helpful or a problem here: a door hinge squeaking? (a) a problem (b) helpful
6. 6.🪝 Fixed or movable pulley: which one only changes direction? (a) a movable pulley (b) a fixed pulley
7. 7.🛞 More or less friction: sand on a slippery path? (a) more friction (b) less friction
8. 8.⚖️ Along a straight bar, measured from the left end, the effort is at 10 cm, the fulcrum at 20 cm and the load at 60 cm. Which class of lever is it? (a) class 3 (b) class 1 (c) class 2
9. 9.🏋️ Mechanical advantage (MA) = … (a) load × effort (b) load ÷ effort (c) effort ÷ load (d) load + effort
10. 10.⚙️ Which simple machine is an axe blade? (a) pulley (b) wedge (c) inclined plane (d) lever
11. 11.⚖️ Going along a lever from one end to the other, the order is: load, effort, fulcrum. Which class of lever is it? (a) class 2 (b) class 1 (c) class 3
12. 12.⚖️ Along a straight bar, measured from the left end, the effort is at 20 cm, the fulcrum at 0 cm and the load at 50 cm. Which class of lever is it? (a) class 3 (b) class 2 (c) class 1
13. 13.🪝 A pulley system lifts a 330 N load with an effort of 110 N. What is its mechanical advantage (MA)?
14. 14.⚖️ A lever bar balances. The load is 800 N at 30 cm from the fulcrum. The effort is ? N at 100 cm from the fulcrum on the other side. What is the missing force in newtons?
15. 15.True or false: a grippy rubber sole gives less friction. (a) False (b) True
16. 16.💪 Which force is at work: a thrown ball comes down? (a) friction (b) magnetic force (c) gravity (d) muscular force
17. 17.True or false: a fixed pulley makes you pull 2× rope. (a) False (b) True
18. 18.True or false: a well winch handle is an inclined plane. (a) True (b) False
19. 19.Which of these is a wedge? (a) the tip of a nail (b) a round doorknob (c) a playground slide (d) a flagpole rope wheel
20. 20.🛞 More or less friction: a wheel on ball bearings? (a) less friction (b) more friction
21. 21.True or false: skating on ice gives more friction. (a) True (b) False
22. 22.🪝 Fixed or movable pulley: which one stays in one place? (a) a fixed pulley (b) a movable pulley
23. 23.🏋️ A 13 kg box is lifted straight up by 5 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
24. 24.⚖️ A seesaw balances. Arjun (? N) sits 2 m from the pivot on one side; Meena (300 N) sits 2 m from the pivot on the other side. What is the missing weight in newtons?
25. 25.🪝 A winch has a wheel of radius 4 cm and an axle of radius 1 cm. What effort on the wheel lifts a 560 N bucket on the axle, in newtons? (ideal)
26. 26.🏋️ A force of 70 N did 210 J of work. How many metres did the object move?
27. 27.🛞 Is friction helpful or a problem here: striking a matchstick? (a) helpful (b) a problem
28. 28.🪝 A bucket weighing 220 N is lifted with a single fixed pulley at the top of a well. What effort is needed, in newtons? (ideal pulley, no friction)
29. 29.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 10 N, sandpaper 11 N, a glass sheet 4 N, a wooden plank 7 N. How many newtons more were needed on sandpaper than on a glass sheet?
30. 30.🏋️ A 4 kg box is lifted straight up by 3 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
31. 31.True or false: a movable pulley halves the effort. (a) False (b) True
32. 32.Which of these is a screw? (a) a claw hammer on a nail (b) a jar lid (c) the tip of a nail (d) a steering wheel
33. 33.⚖️ A lever bar balances. The load is 300 N at ? cm from the fulcrum. The effort is 120 N at 100 cm from the fulcrum on the other side. What is the missing distance in centimetres?
34. 34.⚙️ Which simple machine is a claw hammer on a nail? (a) wheel and axle (b) wedge (c) lever (d) inclined plane
35. 35.🔍 Which is the odd one out? (a) a round doorknob (b) a window blind cord (c) a crane hook block (d) a flagpole rope wheel
36. 36.⚖️ A seesaw balances. Asha (? N) sits 1 m from the pivot on one side; Zoya (190 N) sits 3 m from the pivot on the other side. What is the missing weight in newtons?
37. 37.True or false: powder on a carrom board gives more friction. (a) False (b) True
38. 38.True or false: kicking a football is a pull. (a) False (b) True
39. 39.🏋️ In which unit is work measured? (a) watt hour (b) newton (N) (c) metre (m) (d) joule (J)
40. 40.🪝 Fixed or movable pulley: which one hangs on the rope loop? (a) a fixed pulley (b) a movable pulley

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