Engineering Worksheet: Part 2 Test

Engineering lesson 16: Part 2 test: forces and machines · Set 240 · 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.🛞 Is friction helpful or a problem here: striking a matchstick? (a) helpful (b) a problem
2. 2.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 3 N, a carpet 7 N, sandpaper 8 N, a glass sheet 2 N. Which surface gave the most friction? (a) sandpaper (b) a glass sheet (c) a carpet (d) a wooden plank
3. 3.🏋️ Work is done when a force moves something … (a) very slowly (b) without moving it (c) only upwards (d) through a distance
4. 4.Which of these is caused by muscular force? (a) pedalling a cycle (b) brakes stop a bicycle (c) a rolling ball slows (d) a fridge magnet sticks
5. 5.🛞 More or less friction: a wet tiled floor? (a) more friction (b) less friction
6. 6.True or false: a fixed pulley needs effort = load. (a) False (b) True
7. 7.💪 In which unit do we measure force? (a) metre (m) (b) newton (N) (c) second (s) (d) litre (L)
8. 8.💪 A bag has a mass of 58 kg. Taking 1 kg to weigh about 10 N, what is its weight in newtons?
9. 9.💪 A box weighs 190 N. Taking 1 kg to weigh about 10 N, what is its mass in kilograms?
10. 10.True or false: a playground slide is an inclined plane. (a) True (b) False
11. 11.True or false: a rough doormat gives less friction. (a) True (b) False
12. 12.💪 A bag has a mass of 44 kg. Taking 1 kg to weigh about 10 N, what is its weight in newtons?
13. 13.🪝 Fixed or movable pulley: which one stays in one place? (a) a movable pulley (b) a fixed pulley
14. 14.⚖️ Which class of lever is a lemon squeezer? (a) class 1 (b) class 3 (c) class 2
15. 15.💪 Which force is at work: a rolling ball slows? (a) gravity (b) magnetic force (c) muscular force (d) friction
16. 16.⚙️ Which simple machine is a nut and bolt? (a) lever (b) wedge (c) pulley (d) screw
17. 17.🏋️ A smooth ramp is 6 m long and rises 3 m. What effort pushes a 1800 N box up it, in newtons? (ideal ramp, no friction)
18. 18.True or false: oil on a squeaky hinge gives less friction. (a) False (b) True
19. 19.⚖️ A lever bar balances. The load is ? N at 10 cm from the fulcrum. The effort is 100 N at 60 cm from the fulcrum on the other side. What is the missing force in newtons?
20. 20.🛞 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 carpet 5 N, sandpaper 6 N. Which surface gave the most friction? (a) a carpet (b) ice (c) sandpaper (d) a glass sheet
21. 21.⚖️ A seesaw balances. Kabir (600 N) sits 2 m from the pivot on one side; Arjun (? N) sits 3 m from the pivot on the other side. What is the missing weight in newtons?
22. 22.🏋️ In which unit is work measured? (a) newton (N) (b) joule (J) (c) metre (m) (d) watt hour
23. 23.Which of these is caused by magnetic force? (a) squeezing a lemon (b) a fridge magnet sticks (c) pedalling a cycle (d) shoes grip the floor
24. 24.⚙️ How many simple machines are there in the usual list? (a) 10 (b) 3 (c) 12 (d) 6
25. 25.🛞 More or less friction: a tyre with deep treads? (a) more friction (b) less friction
26. 26.True or false: skating on ice gives more friction. (a) True (b) False
27. 27.⚖️ Along a straight bar, measured from the left end, the effort is at 30 cm, the fulcrum at 10 cm and the load at 70 cm. Which class of lever is it? (a) class 2 (b) class 1 (c) class 3
28. 28.True or false: a box pushed on carpet gives more friction. (a) False (b) True
29. 29.⚖️ A lever bar balances. The load is 180 N at 10 cm from the fulcrum. The effort is ? N at 90 cm from the fulcrum on the other side. What is the missing force in newtons?
30. 30.True or false: a movable pulley hangs on the rope loop. (a) False (b) True
31. 31.True or false: a beam balance is a class 1 lever (fulcrum in the middle). (a) True (b) False
32. 32.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 3 N, a glass sheet 6 N, a carpet 8 N, sandpaper 10 N. How many newtons more were needed on sandpaper than on ice?
33. 33.⚖️ A lever balances when … (a) the bar is short (b) the fulcrum moves (c) both weights are equal (d) turning effects match
34. 34.True or false: a smooth steel slide gives less friction. (a) False (b) True
35. 35.⚖️ Going along a lever from one end to the other, the order is: load, effort, fulcrum. Which class of lever is it? (a) class 3 (b) class 1 (c) class 2
36. 36.⚖️ Turning effect = force × … (a) colour of bar (b) time taken (c) mass of fulcrum (d) distance from fulcrum
37. 37.⚖️ A lever bar balances. The load is 40 N at 10 cm from the fulcrum. The effort is 20 N at ? cm from the fulcrum on the other side. What is the missing distance in centimetres?
38. 38.💪 Is plucking a mango a push or a pull? (a) a push (b) a pull
39. 39.🛞 More or less friction: sand on a slippery path? (a) less friction (b) more friction
40. 40.🪝 More rope sections holding a load means … (a) less effort needed (b) no change (c) more effort needed (d) the load floats

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