Engineering Worksheet: Part 2 Test

Engineering lesson 16: Part 2 test: forces and machines · Set 676 · 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.💪 Two children push a box to the right, one with 40 N and the other with 30 N. What is the net (total) force on the box, in newtons?
2. 2.⚖️ A lever bar balances. The load is 360 N at ? cm from the fulcrum. The effort is 180 N at 60 cm from the fulcrum on the other side. What is the missing distance in centimetres?
3. 3.💪 Is kicking a football a push or a pull? (a) a pull (b) a push
4. 4.True or false: plucking a mango is a push. (a) False (b) True
5. 5.⚖️ Turning effect = force × … (a) mass of fulcrum (b) colour of bar (c) distance from fulcrum (d) time taken
6. 6.⚖️ Which class of lever is a seesaw? (a) class 1 (b) class 2 (c) class 3
7. 7.Which of these is a screw? (a) a steering wheel (b) a window blind cord (c) a crowbar (d) a jar lid
8. 8.⚖️ A lever bar balances. The load is ? N at 10 cm from the fulcrum. The effort is 50 N at 70 cm from the fulcrum on the other side. What is the missing force in newtons?
9. 9.True or false: a claw hammer on a nail is a wedge. (a) True (b) False
10. 10.🛞 Is friction helpful or a problem here: dragging a heavy box? (a) helpful (b) a problem
11. 11.🏋️ A smooth ramp is 12 m long and rises 2 m. What effort pushes a 4200 N box up it, in newtons? (ideal ramp, no friction)
12. 12.💪 Which force is at work: an apple falls down? (a) magnetic force (b) friction (c) gravity (d) muscular force
13. 13.Which of these is an inclined plane? (a) a steering wheel (b) a chisel (c) a road up a hill (d) an axe blade
14. 14.True or false: a wet tiled floor gives less friction. (a) False (b) True
15. 15.🛞 More or less friction: a wet tiled floor? (a) more friction (b) less friction
16. 16.💪 Two children push a box to the right, one with 65 N and the other with 80 N. What is the net (total) force on the box, in newtons?
17. 17.🪝 A pulley system has 1 rope section holding up the load. To lift the load by 3 m, how many metres of rope must you pull?
18. 18.💪 In which unit do we measure force? (a) litre (L) (b) metre (m) (c) newton (N) (d) second (s)
19. 19.True or false: a nutcracker is a wedge. (a) True (b) False
20. 20.💪 Which force is at work: a compass needle turns? (a) gravity (b) magnetic force (c) friction (d) muscular force
21. 21.⚙️ A screw is really … (a) a ramp wrapped round (b) a bent lever (c) a kind of wheel (d) a tiny pulley
22. 22.True or false: a lemon squeezer is a class 2 lever (load in the middle). (a) False (b) True
23. 23.⚖️ Which class of lever is a nutcracker? (a) class 1 (b) class 2 (c) class 3
24. 24.Which of these is an inclined plane? (a) a seesaw (b) a crowbar (c) a wheelchair ramp (d) a door stopper
25. 25.💪 Is pulling a cart a push or a pull? (a) a push (b) a pull
26. 26.⚖️ A seesaw balances. Asha (280 N) sits 2 m from the pivot on one side; Zoya (280 N) sits ? m from the pivot on the other side. What is the missing distance in metres?
27. 27.⚖️ Which class of lever is a pair of kitchen tongs? (a) class 2 (b) class 3 (c) class 1
28. 28.🛞 Is friction helpful or a problem here: a knot holding a rope? (a) a problem (b) helpful
29. 29.True or false: a bottle cap is a screw. (a) False (b) True
30. 30.🪝 A load of 390 N hangs from a pulley system in which 3 rope sections hold up the load. What effort is needed, in newtons? (ideal pulleys)
31. 31.🛞 Is friction helpful or a problem here: tyres wearing down? (a) helpful (b) a problem
32. 32.True or false: sand on a slippery path gives less friction. (a) True (b) False
33. 33.🏋️ A smooth ramp is 10 m long and rises 2 m. What effort pushes a 4750 N box up it, in newtons? (ideal ramp, no friction)
34. 34.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 3 N, a wooden plank 4 N, a carpet 7 N, sandpaper 9 N. Which surface gave the most friction? (a) a glass sheet (b) a wooden plank (c) sandpaper (d) a carpet
35. 35.⚖️ Which class of lever is a crowbar? (a) class 2 (b) class 1 (c) class 3
36. 36.🛞 More or less friction: sand on a slippery path? (a) more friction (b) less friction
37. 37.🪝 A load of 560 N hangs from a pulley system in which 2 rope sections hold up the load. What effort is needed, in newtons? (ideal pulleys)
38. 38.🛞 More or less friction: a rough doormat? (a) less friction (b) more friction
39. 39.🏋️ Pushing a crate 4 m took 360 J of work. What force was used, in newtons?
40. 40.💪 A bag has a mass of 18 kg. Taking 1 kg to weigh about 10 N, what is its weight in newtons?

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