Engineering Worksheet: Part 2 Test

Engineering lesson 16: Part 2 test: forces and machines · Set 71 · 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 5 kg box is lifted straight up by 1 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
2. 2.🔍 Which is the odd one out? (a) a truck loading ramp (b) a claw hammer on a nail (c) a nutcracker (d) a seesaw
3. 3.Which of these is a pulley? (a) a bottle cap (b) a truck loading ramp (c) a flagpole rope wheel (d) a playground slide
4. 4.🏋️ Pushing a crate 7 m took 140 J of work. What force was used, in newtons?
5. 5.⚙️ A screw is really … (a) a ramp wrapped round (b) a bent lever (c) a tiny pulley (d) a kind of wheel
6. 6.⚖️ A seesaw balances. Meena (? N) sits 3 m from the pivot on one side; Kabir (600 N) sits 3 m from the pivot on the other side. What is the missing weight in newtons?
7. 7.⚖️ A seesaw balances. Meena (400 N) sits ? m from the pivot on one side; Asha (200 N) sits 2 m from the pivot on the other side. What is the missing distance in metres?
8. 8.⚖️ A lever bar balances. The load is ? N at 10 cm from the fulcrum. The effort is 80 N at 70 cm from the fulcrum on the other side. What is the missing force in newtons?
9. 9.💪 Which force is at work: brakes stop a bicycle? (a) muscular force (b) gravity (c) magnetic force (d) friction
10. 10.🛞 How can we reduce friction in a machine? (a) add sand (b) press parts harder (c) make parts rough (d) oil the moving parts
11. 11.⚖️ A seesaw balances. Ravi (300 N) sits 3 m from the pivot on one side; Asha (300 N) sits ? m from the pivot on the other side. What is the missing distance in metres?
12. 12.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 8 N, sandpaper 11 N, ice 3 N, a glass sheet 6 N. Which surface gave the most friction? (a) sandpaper (b) ice (c) a glass sheet (d) a carpet
13. 13.🛞 Friction acts … (a) only upwards (b) with the motion (c) against the motion (d) only on ice
14. 14.True or false: powder on a carrom board gives less friction. (a) False (b) True
15. 15.🪝 More rope sections holding a load means … (a) more effort needed (b) no change (c) less effort needed (d) the load floats
16. 16.⚖️ Along a straight bar, measured from the left end, the effort is at 10 cm, the fulcrum at 90 cm and the load at 50 cm. Which class of lever is it? (a) class 2 (b) class 1 (c) class 3
17. 17.⚖️ A lever bar balances. The load is 160 N at ? cm from the fulcrum. The effort is 20 N at 80 cm from the fulcrum on the other side. What is the missing distance in centimetres?
18. 18.⚖️ A seesaw balances. Arjun (? N) sits 1 m from the pivot on one side; Ravi (160 N) sits 2 m from the pivot on the other side. What is the missing weight in newtons?
19. 19.⚖️ A lever bar balances. The load is 80 N at 10 cm from the fulcrum. The effort is ? N at 80 cm from the fulcrum on the other side. What is the missing force in newtons?
20. 20.💪 In a tug of war, one team pulls left with 60 N and the other pulls right with 20 N. What is the size of the net force, in newtons?
21. 21.🏋️ A force of 50 N pushes a cart 7 m along the floor. How much work is done, in joules?
22. 22.⚖️ Which class of lever is a beam balance? (a) class 3 (b) class 1 (c) class 2
23. 23.True or false: a tug of war is a push. (a) True (b) False
24. 24.⚖️ Which class of lever is a lemon squeezer? (a) class 2 (b) class 3 (c) class 1
25. 25.🏋️ A force of 490 N pushes a cart 3 m along the floor. How much work is done, in joules?
26. 26.💪 Which can a force NOT do? (a) change its colour (b) stop it moving (c) start it moving (d) change its shape
27. 27.🛞 More or less friction: a smooth steel slide? (a) less friction (b) more friction
28. 28.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 9 N, sandpaper 12 N, ice 3 N, a glass sheet 6 N. Which surface gave the most friction? (a) sandpaper (b) ice (c) a glass sheet (d) a carpet
29. 29.🪝 A load of 750 N hangs from a pulley system in which 3 rope sections hold up the load. What effort is needed, in newtons? (ideal pulleys)
30. 30.🛞 More or less friction: sand on a slippery path? (a) more friction (b) less friction
31. 31.⚖️ A lever bar balances. The load is 120 N at 20 cm from the fulcrum. The effort is ? N at 30 cm from the fulcrum on the other side. What is the missing force in newtons?
32. 32.⚖️ Turning effect = force × … (a) time taken (b) colour of bar (c) distance from fulcrum (d) mass of fulcrum
33. 33.⚖️ Which class of lever is a pair of scissors? (a) class 2 (b) class 3 (c) class 1
34. 34.💪 Is opening a drawer a push or a pull? (a) a push (b) a pull
35. 35.🪝 A wheel and axle is a big wheel fixed to … (a) a smaller rod (axle) (b) a sharp wedge (c) a loose rope (d) a flat ramp
36. 36.⚖️ A seesaw balances. Kabir (400 N) sits ? m from the pivot on one side; Arjun (300 N) sits 4 m from the pivot on the other side. What is the missing distance in metres?
37. 37.🔍 Which is the odd one out? (a) a jar lid (b) a wheelchair ramp (c) a nut and bolt (d) a wood screw
38. 38.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 7 N, ice 2 N, a glass sheet 4 N, a wooden plank 6 N. Which surface gave the least friction? (a) a wooden plank (b) a glass sheet (c) ice (d) sandpaper
39. 39.True or false: pulling a cart is a push. (a) False (b) True
40. 40.⚖️ A seesaw balances. Meena (? N) sits 3 m from the pivot on one side; Ravi (300 N) sits 4 m from the pivot on the other side. What is the missing weight in newtons?

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