Engineering Worksheet: Part 2 Test

Engineering lesson 16: Part 2 test: forces and machines · Set 444 · 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 pair of pliers? (a) class 2 (b) class 1 (c) class 3
2. 2.⚙️ Which simple machine is a wheelchair ramp? (a) wedge (b) wheel and axle (c) lever (d) inclined plane
3. 3.True or false: a pair of scissors is a class 1 lever (fulcrum in the middle). (a) False (b) True
4. 4.True or false: a fixed pulley rises with the load. (a) False (b) True
5. 5.⚖️ Along a straight bar, measured from the left end, the effort is at 50 cm, the fulcrum at 30 cm and the load at 10 cm. Which class of lever is it? (a) class 2 (b) class 1 (c) class 3
6. 6.🔍 Which is the odd one out? (a) sand on a slippery path (b) powder on a carrom board (c) a wheel on ball bearings (d) a wet tiled floor
7. 7.🏋️ Mechanical advantage (MA) = … (a) load + effort (b) load ÷ effort (c) load × effort (d) effort ÷ load
8. 8.True or false: a fixed pulley halves the effort. (a) False (b) True
9. 9.🏋️ A machine lifts a load of 150 N when you push with 50 N. What is its mechanical advantage (MA)?
10. 10.💪 Which force is at work: a magnet picks up pins? (a) gravity (b) friction (c) muscular force (d) magnetic force
11. 11.⚖️ In a class 1 lever, what is in the middle? (a) the fulcrum (b) nothing (c) the effort (d) the load
12. 12.🏋️ Work is done when a force moves something … (a) very slowly (b) only upwards (c) through a distance (d) without moving it
13. 13.True or false: a movable pulley halves the effort. (a) True (b) False
14. 14.💪 Is pushing a trolley a push or a pull? (a) a pull (b) a push
15. 15.💪 In which unit do we measure force? (a) metre (m) (b) litre (L) (c) newton (N) (d) second (s)
16. 16.True or false: a movable pulley stays in one place. (a) True (b) False
17. 17.Which of these is caused by muscular force? (a) a magnet picks up pins (b) brakes stop a bicycle (c) lifting a school bag (d) an apple falls down
18. 18.True or false: a pair of tweezers is a class 1 lever (fulcrum in the middle). (a) True (b) False
19. 19.True or false: a well winch handle is a screw. (a) True (b) False
20. 20.🪝 A winch has a wheel of radius 12 cm and an axle of radius 2 cm. What effort on the wheel lifts a 1080 N bucket on the axle, in newtons? (ideal)
21. 21.Which of these is a lever? (a) a knife edge (b) a window blind cord (c) a well winch handle (d) a claw hammer on a nail
22. 22.🏋️ A machine lifts a load of 120 N when you push with 40 N. What is its mechanical advantage (MA)?
23. 23.💪 A bag has a mass of 60 kg. Taking 1 kg to weigh about 10 N, what is its weight in newtons?
24. 24.💪 Is hitting a cricket ball a push or a pull? (a) a pull (b) a push
25. 25.⚙️ Which simple machine is a crane hook block? (a) pulley (b) wheel and axle (c) screw (d) inclined plane
26. 26.True or false: a wheel on ball bearings gives less friction. (a) False (b) True
27. 27.⚖️ A seesaw balances. Kabir (600 N) sits 3 m from the pivot on one side; Arjun (600 N) sits ? m from the pivot on the other side. What is the missing distance in metres?
28. 28.💪 In a tug of war, one team pulls right with 15 N and the other pulls left with 10 N. What is the size of the net force, in newtons?
29. 29.🏋️ A force of 450 N did 900 J of work. How many metres did the object move?
30. 30.⚖️ Turning effect = force × … (a) colour of bar (b) distance from fulcrum (c) time taken (d) mass of fulcrum
31. 31.💪 Is kicking a football a push or a pull? (a) a push (b) a pull
32. 32.🪝 Fixed or movable pulley: which one hangs on the rope loop? (a) a fixed pulley (b) a movable pulley
33. 33.🛞 More or less friction: a wet tiled floor? (a) more friction (b) less friction
34. 34.Which of these is a wheel and axle? (a) a knife edge (b) a bottle opener (c) a well winch handle (d) a crane hook block
35. 35.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 4 N, a carpet 8 N, sandpaper 12 N, ice 1 N. How many newtons more were needed on sandpaper than on ice?
36. 36.🪝 A well winch has a handle (wheel) of radius 4 cm turning an axle of radius 2 cm. What is its mechanical advantage (MA)?
37. 37.True or false: a movable pulley only changes direction. (a) False (b) True
38. 38.⚖️ A lever balances when … (a) the bar is short (b) both weights are equal (c) turning effects match (d) the fulcrum moves
39. 39.⚙️ Which simple machine is a playground slide? (a) lever (b) screw (c) inclined plane (d) pulley
40. 40.⚖️ A seesaw balances. Meena (? N) sits 2 m from the pivot on one side; Zoya (260 N) sits 4 m from the pivot on the other side. What is the missing weight in newtons?

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