Engineering Worksheet: Part 2 Test

Engineering lesson 16: Part 2 test: forces and machines · Set 749 · 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.⚖️ A lever bar balances. The load is 20 N at ? cm from the fulcrum. The effort is 10 N at 20 cm from the fulcrum on the other side. What is the missing distance in centimetres?
2. 2.🛞 Is friction helpful or a problem here: brakes stopping a cycle? (a) a problem (b) helpful
3. 3.Which of these is an inclined plane? (a) a round doorknob (b) a wheelchair ramp (c) a well winch handle (d) a wood screw
4. 4.🔍 Which is the odd one out? (a) a tyre with deep treads (b) chalk on a gym bar (c) sand on a slippery path (d) a wet tiled floor
5. 5.⚖️ Along a straight bar, measured from the left end, the effort is at 90 cm, the fulcrum at 10 cm and the load at 50 cm. Which class of lever is it? (a) class 2 (b) class 1 (c) class 3
6. 6.True or false: a fixed pulley needs effort = load. (a) False (b) True
7. 7.🏋️ A force of 150 N pushes a cart 8 m along the floor. How much work is done, in joules?
8. 8.🏋️ A force of 20 N pushes a cart 2 m along the floor. How much work is done, in joules?
9. 9.💪 A box weighs 580 N. Taking 1 kg to weigh about 10 N, what is its mass in kilograms?
10. 10.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 6 N, sandpaper 7 N, ice 2 N, a glass sheet 3 N. Which surface gave the most friction? (a) ice (b) a glass sheet (c) sandpaper (d) a carpet
11. 11.🪝 A pulley system has 4 rope sections holding up the load. To lift the load by 2 m, how many metres of rope must you pull?
12. 12.🏋️ A smooth ramp is 6 m long and rises 1 m. What effort pushes a 1500 N box up it, in newtons? (ideal ramp, no friction)
13. 13.⚖️ To lift a heavy rock with a crowbar more easily, push … (a) near the fulcrum (b) on the fulcrum (c) on the rock (d) far from the fulcrum
14. 14.🏋️ A force of 390 N pushes a cart 8 m along the floor. How much work is done, in joules?
15. 15.⚖️ Which class of lever is a pair of tweezers? (a) class 2 (b) class 3 (c) class 1
16. 16.🪝 A winch has a wheel of radius 3 cm and an axle of radius 1 cm. What effort on the wheel lifts a 480 N bucket on the axle, in newtons? (ideal)
17. 17.True or false: a bottle opener is a class 2 lever (load in the middle). (a) True (b) False
18. 18.True or false: a claw hammer on a nail is a wheel and axle. (a) False (b) True
19. 19.True or false: pressing a doorbell is a pull. (a) True (b) False
20. 20.⚖️ A seesaw balances. Kabir (640 N) sits ? m from the pivot on one side; Meena (320 N) sits 4 m from the pivot on the other side. What is the missing distance in metres?
21. 21.⚖️ A seesaw balances. Meena (? N) sits 2 m from the pivot on one side; Ravi (220 N) sits 1 m from the pivot on the other side. What is the missing weight in newtons?
22. 22.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 5 N, a wooden plank 9 N, sandpaper 12 N, ice 1 N. Which surface gave the most friction? (a) a glass sheet (b) a wooden plank (c) ice (d) sandpaper
23. 23.🔍 Which is the odd one out? (a) a road up a hill (b) a playground slide (c) a wheelchair ramp (d) a well-bucket rope wheel
24. 24.🛞 Is friction helpful or a problem here: shoe soles wearing out? (a) a problem (b) helpful
25. 25.⚖️ A seesaw balances. Zoya (450 N) sits 2 m from the pivot on one side; Ravi (300 N) sits ? m from the pivot on the other side. What is the missing distance in metres?
26. 26.🪝 More rope sections holding a load means … (a) less effort needed (b) the load floats (c) no change (d) more effort needed
27. 27.💪 Is pressing a doorbell a push or a pull? (a) a push (b) a pull
28. 28.🔍 Which is the odd one out? (a) a tyre with deep treads (b) a box pushed on carpet (c) a rough doormat (d) powder on a carrom board
29. 29.⚖️ What is the pivot point of a lever called? (a) the effort (b) the fulcrum (c) the axle (d) the load
30. 30.🏋️ Work is done when a force moves something … (a) only upwards (b) without moving it (c) through a distance (d) very slowly
31. 31.🏋️ A 1 kg box is lifted straight up by 1 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
32. 32.🛞 Is friction helpful or a problem here: gripping a cricket bat? (a) helpful (b) a problem
33. 33.💪 Is hitting a cricket ball a push or a pull? (a) a pull (b) a push
34. 34.🏋️ Can a simple machine reduce the work done? (a) only on Mondays (b) yes, always (c) yes, by half (d) no, work stays the same
35. 35.True or false: a door stopper is a wheel and axle. (a) True (b) False
36. 36.True or false: a movable pulley hangs on the rope loop. (a) False (b) True
37. 37.⚙️ Which simple machine is a chisel? (a) wheel and axle (b) wedge (c) screw (d) inclined plane
38. 38.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 12 N, ice 3 N, a glass sheet 6 N, a wooden plank 10 N. How many newtons more were needed on sandpaper than on ice?
39. 39.⚖️ A seesaw balances. Zoya (? N) sits 2 m from the pivot on one side; Kabir (220 N) sits 3 m from the pivot on the other side. What is the missing weight in newtons?
40. 40.🪝 A winch has a wheel of radius 32 cm and an axle of radius 4 cm. What effort on the wheel lifts a 960 N bucket on the axle, in newtons? (ideal)

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