Engineering Worksheet: Part 2 Test

Engineering lesson 16: Part 2 test: forces and machines · Set 623 · 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 tweezers? (a) class 3 (b) class 2 (c) class 1
2. 2.⚖️ A seesaw balances. Zoya (360 N) sits 1 m from the pivot on one side; Meena (? N) sits 2 m from the pivot on the other side. What is the missing weight in newtons?
3. 3.⚖️ On a seesaw, a heavier child should sit … (a) farther from the pivot (b) on the pivot (c) anywhere (d) closer to the pivot
4. 4.💪 In a tug of war, one team pulls left with 55 N and the other pulls right with 25 N. What is the size of the net force, in newtons?
5. 5.⚖️ A lever bar balances. The load is 540 N at 20 cm from the fulcrum. The effort is 120 N at ? cm from the fulcrum on the other side. What is the missing distance in centimetres?
6. 6.Which of these is a screw? (a) a flagpole rope wheel (b) a bottle cap (c) a well winch handle (d) a window blind cord
7. 7.🏋️ A force of 120 N pushes a cart 3 m along the floor. How much work is done, in joules?
8. 8.Which of these is a pulley? (a) a jar lid (b) a flagpole rope wheel (c) a bottle cap (d) a claw hammer on a nail
9. 9.🛞 Is friction helpful or a problem here: walking without slipping? (a) a problem (b) helpful
10. 10.True or false: a movable pulley hangs on the rope loop. (a) False (b) True
11. 11.🔍 Which is the odd one out? (a) a wood screw (b) a bottle cap (c) a nut and bolt (d) an axe blade
12. 12.🪝 A load of 80 N hangs from a pulley system in which 2 rope sections hold up the load. What effort is needed, in newtons? (ideal pulleys)
13. 13.⚖️ A seesaw balances. Meena (? N) sits 4 m from the pivot on one side; Arjun (680 N) sits 1 m from the pivot on the other side. What is the missing weight in newtons?
14. 14.🏋️ A 6 kg box is lifted straight up by 5 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
15. 15.True or false: pushing a swing is a push. (a) True (b) False
16. 16.🏋️ A smooth ramp is 4 m long and rises 1 m. What effort pushes a 1200 N box up it, in newtons? (ideal ramp, no friction)
17. 17.True or false: a fixed pulley hangs on the rope loop. (a) False (b) True
18. 18.⚖️ A lever bar balances. The load is 300 N at 10 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?
19. 19.🛞 Which surface gives the MOST friction to a sliding block? (a) ice (b) glass (c) polished marble (d) sandpaper
20. 20.💪 Which force is at work: rain falls to the ground? (a) friction (b) gravity (c) muscular force (d) magnetic force
21. 21.🛞 More or less friction: sand on a slippery path? (a) less friction (b) more friction
22. 22.⚖️ Along a straight bar, measured from the left end, the effort is at 70 cm, the fulcrum at 30 cm and the load at 10 cm. Which class of lever is it? (a) class 3 (b) class 1 (c) class 2
23. 23.💪 A cart is pulled to the right with 30 N and to the left with 25 N. Which way does the net force act? (a) to the right (b) no net force (c) to the left
24. 24.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 3 N, a wooden plank 7 N, a carpet 10 N, sandpaper 14 N. Which surface gave the least friction? (a) a glass sheet (b) a carpet (c) sandpaper (d) a wooden plank
25. 25.True or false: a wheel on ball bearings gives less friction. (a) True (b) False
26. 26.Which of these is a wheel and axle? (a) a crowbar (b) a wood screw (c) a water tap handle (d) a bottle cap
27. 27.🏋️ Can a simple machine reduce the work done? (a) yes, always (b) yes, by half (c) only on Mondays (d) no, work stays the same
28. 28.True or false: a smooth steel slide gives more friction. (a) True (b) False
29. 29.⚖️ A seesaw balances. Asha (600 N) sits 1 m from the pivot on one side; Kabir (150 N) sits ? m from the pivot on the other side. What is the missing distance in metres?
30. 30.⚖️ A seesaw balances. Kabir (? N) sits 2 m from the pivot on one side; Ravi (200 N) sits 2 m from the pivot on the other side. What is the missing weight in newtons?
31. 31.⚖️ A seesaw balances. Arjun (? N) sits 1 m from the pivot on one side; Kabir (100 N) sits 4 m from the pivot on the other side. What is the missing weight in newtons?
32. 32.True or false: sand on a slippery path gives less friction. (a) True (b) False
33. 33.🏋️ A smooth ramp is 5 m long and rises 1 m. What effort pushes a 500 N box up it, in newtons? (ideal ramp, no friction)
34. 34.⚖️ A lever bar balances. The load is 120 N at 20 cm from the fulcrum. The effort is ? N at 60 cm from the fulcrum on the other side. What is the missing force in newtons?
35. 35.Which of these is caused by muscular force? (a) rubbing hands warms them (b) a thrown ball comes down (c) squeezing a lemon (d) shoes grip the floor
36. 36.💪 A box weighs 200 N. Taking 1 kg to weigh about 10 N, what is its mass in kilograms?
37. 37.🏋️ A 10 kg box is lifted straight up by 4 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
38. 38.🛞 More or less friction: a tyre with deep treads? (a) more friction (b) less friction
39. 39.🛞 Friction acts … (a) only on ice (b) with the motion (c) only upwards (d) against the motion
40. 40.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 4 N, a wooden plank 8 N, a carpet 12 N, sandpaper 14 N. Which surface gave the least friction? (a) a wooden plank (b) sandpaper (c) ice (d) a carpet

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