Engineering Worksheet: Part 2 Test

Engineering lesson 16: Part 2 test: forces and machines · Set 997 · 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.🛞 Is friction helpful or a problem here: machine parts heating up? (a) helpful (b) a problem
2. 2.🪝 Fixed or movable pulley: which one halves the effort? (a) a movable pulley (b) a fixed pulley
3. 3.⚖️ In a class 3 lever, what is in the middle? (a) the fulcrum (b) the load (c) the pulley (d) the effort
4. 4.⚖️ Going along a lever from one end to the other, the order is: effort, load, fulcrum. Which class of lever is it? (a) class 1 (b) class 2 (c) class 3
5. 5.🪝 A bucket weighing 390 N is lifted with a single fixed pulley at the top of a well. What effort is needed, in newtons? (ideal pulley, no friction)
6. 6.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 5 N, sandpaper 6 N, ice 1 N, a glass sheet 3 N. How many newtons more were needed on sandpaper than on ice?
7. 7.⚖️ Along a straight bar, measured from the left end, the effort is at 30 cm, the fulcrum at 20 cm and the load at 10 cm. Which class of lever is it? (a) class 3 (b) class 1 (c) class 2
8. 8.💪 Two children push a box to the right, one with 65 N and the other with 55 N. What is the net (total) force on the box, in newtons?
9. 9.🔍 Which is the odd one out? (a) a tyre with deep treads (b) skating on ice (c) a wheel on ball bearings (d) oil on a squeaky hinge
10. 10.⚖️ Going along a lever from one end to the other, the order is: load, fulcrum, effort. Which class of lever is it? (a) class 3 (b) class 1 (c) class 2
11. 11.⚙️ Which simple machine is a bottle opener? (a) lever (b) wedge (c) screw (d) wheel and axle
12. 12.🏋️ Mechanical advantage (MA) = … (a) load + effort (b) load ÷ effort (c) load × effort (d) effort ÷ load
13. 13.🏋️ A force of 120 N did 1200 J of work. How many metres did the object move?
14. 14.🪝 Fixed or movable pulley: which one hangs on the rope loop? (a) a fixed pulley (b) a movable pulley
15. 15.True or false: plucking a mango is a pull. (a) True (b) False
16. 16.🏋️ Work is done when a force moves something … (a) without moving it (b) only upwards (c) very slowly (d) through a distance
17. 17.🏋️ A force of 80 N pushes a cart 4 m along the floor. How much work is done, in joules?
18. 18.🏋️ Pushing a crate 3 m took 540 J of work. What force was used, in newtons?
19. 19.🏋️ Pushing a crate 1 m took 200 J of work. What force was used, in newtons?
20. 20.True or false: a movable pulley hangs on the rope loop. (a) False (b) True
21. 21.⚖️ A seesaw balances. Kabir (480 N) sits ? m from the pivot on one side; Zoya (320 N) sits 3 m from the pivot on the other side. What is the missing distance in metres?
22. 22.⚖️ A seesaw balances. Asha (200 N) sits 2 m from the pivot on one side; Arjun (? N) sits 1 m from the pivot on the other side. What is the missing weight in newtons?
23. 23.💪 Which force is at work: a fridge magnet sticks? (a) friction (b) magnetic force (c) muscular force (d) gravity
24. 24.🔍 Which is the odd one out? (a) oil on a squeaky hinge (b) sand on a slippery path (c) powder on a carrom board (d) a wet tiled floor
25. 25.True or false: opening a drawer is a push. (a) False (b) True
26. 26.💪 Is pushing a trolley a push or a pull? (a) a pull (b) a push
27. 27.⚖️ A seesaw balances. Ravi (380 N) sits 3 m from the pivot on one side; Kabir (570 N) sits ? m from the pivot on the other side. What is the missing distance in metres?
28. 28.⚖️ Along a straight bar, measured from the left end, the effort is at 60 cm, the fulcrum at 30 cm and the load at 10 cm. Which class of lever is it? (a) class 3 (b) class 2 (c) class 1
29. 29.💪 Is closing a drawer a push or a pull? (a) a push (b) a pull
30. 30.🪝 A bucket weighing 130 N is lifted with a single fixed pulley at the top of a well. What effort is needed, in newtons? (ideal pulley, no friction)
31. 31.True or false: a well winch handle is a wheel and axle. (a) False (b) True
32. 32.💪 Which force is at work: a thrown ball comes down? (a) friction (b) muscular force (c) magnetic force (d) gravity
33. 33.True or false: a well-bucket rope wheel is a screw. (a) True (b) False
34. 34.💪 In which unit do we measure force? (a) metre (m) (b) second (s) (c) litre (L) (d) newton (N)
35. 35.🔍 Which is the odd one out? (a) the tip of a nail (b) an axe blade (c) a chisel (d) a steering wheel
36. 36.Which of these is caused by friction? (a) shoes grip the floor (b) a compass needle turns (c) rain falls to the ground (d) a fridge magnet sticks
37. 37.💪 A box weighs 30 N. Taking 1 kg to weigh about 10 N, what is its mass in kilograms?
38. 38.True or false: a truck loading ramp is an inclined plane. (a) True (b) False
39. 39.💪 Is opening a drawer a push or a pull? (a) a pull (b) a push
40. 40.💪 Which force is at work: pedalling a cycle? (a) magnetic force (b) gravity (c) muscular force (d) friction

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