Engineering Worksheet: Part 2 Test

Engineering lesson 16: Part 2 test: forces and machines · Set 183 · 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: a crane hook block is a pulley. (a) False (b) True
2. 2.🔍 Which is the odd one out? (a) a box pushed on carpet (b) a rough doormat (c) a smooth steel slide (d) sand on a slippery path
3. 3.Which of these is caused by friction? (a) a compass needle turns (b) an apple falls down (c) a thrown ball comes down (d) brakes stop a bicycle
4. 4.🪝 A load of 360 N hangs from a pulley system in which 2 rope sections hold up the load. What effort is needed, in newtons? (ideal pulleys)
5. 5.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 6 N, a carpet 7 N, sandpaper 8 N, a glass sheet 2 N. How many newtons more were needed on sandpaper than on a glass sheet?
6. 6.💪 Which force is at work: shoes grip the floor? (a) magnetic force (b) gravity (c) muscular force (d) friction
7. 7.⚖️ A seesaw balances. Ravi (? N) sits 1 m from the pivot on one side; Zoya (110 N) sits 4 m from the pivot on the other side. What is the missing weight in newtons?
8. 8.🪝 A load of 420 N hangs from a pulley system in which 2 rope sections hold up the load. What effort is needed, in newtons? (ideal pulleys)
9. 9.True or false: a crowbar is a class 2 lever (load in the middle). (a) False (b) True
10. 10.🔍 Which is the odd one out? (a) chalk on a gym bar (b) a smooth steel slide (c) powder on a carrom board (d) oil on a squeaky hinge
11. 11.⚖️ A seesaw balances. Asha (390 N) sits ? m from the pivot on one side; Meena (390 N) sits 3 m from the pivot on the other side. What is the missing distance in metres?
12. 12.🪝 A pulley system has 3 rope sections holding up the load. To lift the load by 10 m, how many metres of rope must you pull?
13. 13.🛞 More or less friction: a rough doormat? (a) more friction (b) less friction
14. 14.⚖️ A seesaw balances. Asha (? N) sits 4 m from the pivot on one side; Arjun (480 N) sits 2 m from the pivot on the other side. What is the missing weight in newtons?
15. 15.⚖️ 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 2 (c) class 1
16. 16.⚖️ A lever bar balances. The load is 400 N at 20 cm from the fulcrum. The effort is 200 N at ? cm from the fulcrum on the other side. What is the missing distance in centimetres?
17. 17.💪 Two children push a box to the right, one with 80 N and the other with 5 N. What is the net (total) force on the box, in newtons?
18. 18.🪝 A load of 260 N hangs from a pulley system in which 2 rope sections hold up the load. What effort is needed, in newtons? (ideal pulleys)
19. 19.⚖️ In a class 1 lever, what is in the middle? (a) nothing (b) the load (c) the effort (d) the fulcrum
20. 20.⚖️ A lever balances when … (a) the bar is short (b) both weights are equal (c) the fulcrum moves (d) turning effects match
21. 21.🪝 Fixed or movable pulley: which one rises with the load? (a) a movable pulley (b) a fixed pulley
22. 22.True or false: pressing a doorbell is a pull. (a) True (b) False
23. 23.True or false: pushing a swing is a push. (a) False (b) True
24. 24.⚙️ Which simple machine is a bottle cap? (a) wheel and axle (b) screw (c) lever (d) wedge
25. 25.💪 A box weighs 600 N. Taking 1 kg to weigh about 10 N, what is its mass in kilograms?
26. 26.⚖️ Going along a lever from one end to the other, the order is: fulcrum, load, effort. Which class of lever is it? (a) class 1 (b) class 2 (c) class 3
27. 27.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 10 N, ice 4 N, a wooden plank 5 N, a carpet 9 N. Which surface gave the least friction? (a) sandpaper (b) a wooden plank (c) a carpet (d) ice
28. 28.💪 Which force is at work: a thrown ball comes down? (a) muscular force (b) friction (c) magnetic force (d) gravity
29. 29.💪 Which force is at work: rain falls to the ground? (a) friction (b) muscular force (c) magnetic force (d) gravity
30. 30.⚖️ A lever bar balances. The load is 450 N at 20 cm from the fulcrum. The effort is 100 N at ? cm from the fulcrum on the other side. What is the missing distance in centimetres?
31. 31.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 1 N, a wooden plank 2 N, a carpet 4 N, sandpaper 7 N. Which surface gave the most friction? (a) a glass sheet (b) a carpet (c) sandpaper (d) a wooden plank
32. 32.⚖️ A seesaw balances. Meena (? N) sits 1 m from the pivot on one side; Zoya (100 N) sits 1 m from the pivot on the other side. What is the missing weight in newtons?
33. 33.🪝 A pulley system has 3 rope sections holding up the load. To lift the load by 2 m, how many metres of rope must you pull?
34. 34.⚖️ What is the pivot point of a lever called? (a) the axle (b) the fulcrum (c) the effort (d) the load
35. 35.💪 In which unit do we measure force? (a) metre (m) (b) second (s) (c) litre (L) (d) newton (N)
36. 36.💪 Two children push a box to the right, one with 15 N and the other with 70 N. What is the net (total) force on the box, in newtons?
37. 37.True or false: a nutcracker is a class 2 lever (load in the middle). (a) False (b) True
38. 38.🏋️ A force of 430 N pushes a cart 3 m along the floor. How much work is done, in joules?
39. 39.🔍 Which is the odd one out? (a) a well winch handle (b) a round doorknob (c) a water tap handle (d) a chisel
40. 40.🔍 Which is the odd one out? (a) a door stopper (b) a claw hammer on a nail (c) an axe blade (d) the tip of a nail

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