Engineering Worksheet: Part 2 Test

Engineering lesson 16: Part 2 test: forces and machines · Set 195 · 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.⚖️ Turning effect = force × … (a) distance from fulcrum (b) time taken (c) mass of fulcrum (d) colour of bar
2. 2.True or false: a bottle cap is a lever. (a) False (b) True
3. 3.💪 Two children push a box to the right, one with 45 N and the other with 65 N. What is the net (total) force on the box, in newtons?
4. 4.🪝 A load of 120 N hangs from a pulley system in which 4 rope sections hold up the load. What effort is needed, in newtons? (ideal pulleys)
5. 5.🪝 Fixed or movable pulley: which one hangs on the rope loop? (a) a fixed pulley (b) a movable pulley
6. 6.🛞 Is friction helpful or a problem here: gripping a cricket bat? (a) a problem (b) helpful
7. 7.🏋️ A smooth ramp is 6 m long and rises 3 m. What effort pushes a 1000 N box up it, in newtons? (ideal ramp, no friction)
8. 8.⚖️ A lever bar balances. The load is 630 N at 40 cm from the fulcrum. The effort is ? N at 70 cm from the fulcrum on the other side. What is the missing force in newtons?
9. 9.🛞 More or less friction: sand on a slippery path? (a) less friction (b) more friction
10. 10.🏋️ Can a simple machine reduce the work done? (a) only on Mondays (b) yes, by half (c) no, work stays the same (d) yes, always
11. 11.⚖️ Which class of lever is a beam balance? (a) class 1 (b) class 2 (c) class 3
12. 12.True or false: a door stopper is a pulley. (a) True (b) False
13. 13.🔍 Which is the odd one out? (a) powder on a carrom board (b) oil on a squeaky hinge (c) a wheel on ball bearings (d) a rough doormat
14. 14.⚙️ Which simple machine is a knife edge? (a) pulley (b) screw (c) inclined plane (d) wedge
15. 15.🛞 Why are tyres made with deep treads? (a) to save rubber (b) to go slower (c) to look nice (d) to grip the road
16. 16.⚖️ A seesaw balances. Zoya (400 N) sits 4 m from the pivot on one side; Meena (400 N) sits ? m from the pivot on the other side. What is the missing distance in metres?
17. 17.🏋️ A 17 kg box is lifted straight up by 5 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
18. 18.⚖️ A seesaw balances. Kabir (220 N) sits ? m from the pivot on one side; Arjun (110 N) sits 2 m from the pivot on the other side. What is the missing distance in metres?
19. 19.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 3 N, a glass sheet 4 N, a wooden plank 6 N, sandpaper 7 N. Which surface gave the most friction? (a) a wooden plank (b) ice (c) sandpaper (d) a glass sheet
20. 20.🔍 Which is the odd one out? (a) a road up a hill (b) a nutcracker (c) a playground slide (d) a wheelchair ramp
21. 21.True or false: drawing up a well bucket is a push. (a) False (b) True
22. 22.🏋️ A force of 400 N did 2000 J of work. How many metres did the object move?
23. 23.Which of these is caused by magnetic force? (a) a thrown ball comes down (b) an apple falls down (c) a fridge magnet sticks (d) shoes grip the floor
24. 24.💪 A force is a … (a) type of sound (b) unit of time (c) kind of colour (d) push or a pull
25. 25.⚖️ Which class of lever is a lemon squeezer? (a) class 3 (b) class 2 (c) class 1
26. 26.🏋️ A force of 150 N did 300 J of work. How many metres did the object move?
27. 27.⚙️ Which simple machine is a flagpole rope wheel? (a) lever (b) pulley (c) wheel and axle (d) wedge
28. 28.⚖️ A seesaw balances. Kabir (160 N) sits 4 m from the pivot on one side; Arjun (640 N) sits ? m from the pivot on the other side. What is the missing distance in metres?
29. 29.🛞 Which surface gives the MOST friction to a sliding block? (a) glass (b) polished marble (c) sandpaper (d) ice
30. 30.⚖️ Along a straight bar, measured from the left end, the effort is at 50 cm, the fulcrum at 30 cm and the load at 80 cm. Which class of lever is it? (a) class 1 (b) class 2 (c) class 3
31. 31.🔍 Which is the odd one out? (a) skating on ice (b) a smooth steel slide (c) a grippy rubber sole (d) a wheel on ball bearings
32. 32.💪 Two children push a box to the right, one with 65 N and the other with 45 N. What is the net (total) force on the box, in newtons?
33. 33.Which of these is caused by muscular force? (a) an apple falls down (b) rain falls to the ground (c) a river flows downhill (d) squeezing a lemon
34. 34.💪 Two children push a box to the right, one with 85 N and the other with 80 N. What is the net (total) force on the box, in newtons?
35. 35.⚙️ A wedge is … (a) a rope on a wheel (b) a bar on a pivot (c) a wheel on a rod (d) two ramps back to back
36. 36.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 4 N, a glass sheet 6 N, a wooden plank 8 N, sandpaper 9 N. How many newtons more were needed on sandpaper than on ice?
37. 37.⚖️ A seesaw balances. Asha (280 N) sits ? m from the pivot on one side; Ravi (140 N) sits 2 m from the pivot on the other side. What is the missing distance in metres?
38. 38.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 6 N, sandpaper 7 N, ice 2 N, a glass sheet 4 N. Which surface gave the most friction? (a) ice (b) a glass sheet (c) a wooden plank (d) sandpaper
39. 39.⚖️ A lever bar balances. The load is 800 N at 10 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?
40. 40.⚖️ A lever bar balances. The load is ? N at 40 cm from the fulcrum. The effort is 320 N at 80 cm from the fulcrum on the other side. What is the missing force in newtons?

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