Engineering Worksheet: Part 2 Test

Engineering lesson 16: Part 2 test: forces and machines · Set 428 · 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 can a force NOT do? (a) change its colour (b) start it moving (c) change its shape (d) stop it moving
2. 2.⚖️ Turning effect = force × … (a) mass of fulcrum (b) colour of bar (c) time taken (d) distance from fulcrum
3. 3.⚖️ A lever bar balances. The load is 270 N at ? cm from the fulcrum. The effort is 270 N at 30 cm from the fulcrum on the other side. What is the missing distance in centimetres?
4. 4.⚙️ Which simple machine is the tip of a nail? (a) wedge (b) screw (c) wheel and axle (d) lever
5. 5.⚖️ Along a straight bar, measured from the left end, the effort is at 60 cm, the fulcrum at 80 cm and the load at 20 cm. Which class of lever is it? (a) class 2 (b) class 3 (c) class 1
6. 6.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 8 N, ice 1 N, a wooden plank 4 N, a carpet 6 N. How many newtons more were needed on sandpaper than on ice?
7. 7.🛞 More or less friction: a smooth steel slide? (a) less friction (b) more friction
8. 8.💪 Is hitting a cricket ball a push or a pull? (a) a push (b) a pull
9. 9.🪝 What does a single fixed pulley change? (a) the size of the load (b) the colour of rope (c) gravity (d) the direction of pull
10. 10.💪 A force is a … (a) kind of colour (b) unit of time (c) push or a pull (d) type of sound
11. 11.💪 Is pressing a doorbell a push or a pull? (a) a pull (b) a push
12. 12.True or false: kicking a football is a push. (a) True (b) False
13. 13.🪝 More rope sections holding a load means … (a) the load floats (b) less effort needed (c) no change (d) more effort needed
14. 14.💪 Which force is at work: a compass needle turns? (a) gravity (b) muscular force (c) magnetic force (d) friction
15. 15.⚖️ Which class of lever is your forearm? (a) class 1 (b) class 3 (c) class 2
16. 16.💪 A bag has a mass of 15 kg. Taking 1 kg to weigh about 10 N, what is its weight in newtons?
17. 17.🪝 A pulley system lifts a 240 N load with an effort of 80 N. What is its mechanical advantage (MA)?
18. 18.True or false: a movable pulley halves the effort. (a) False (b) True
19. 19.True or false: a pair of pliers is a class 3 lever (effort in the middle). (a) False (b) True
20. 20.🏋️ Work is done when a force moves something … (a) very slowly (b) without moving it (c) through a distance (d) only upwards
21. 21.Which of these is caused by friction? (a) pedalling a cycle (b) a magnet picks up pins (c) a compass needle turns (d) brakes stop a bicycle
22. 22.True or false: a pair of tweezers is a class 2 lever (load in the middle). (a) True (b) False
23. 23.🏋️ Pushing a crate 3 m took 870 J of work. What force was used, in newtons?
24. 24.⚖️ Along a straight bar, measured from the left end, the effort is at 10 cm, the fulcrum at 30 cm and the load at 40 cm. Which class of lever is it? (a) class 1 (b) class 2 (c) class 3
25. 25.⚙️ A wedge is … (a) two ramps back to back (b) a wheel on a rod (c) a rope on a wheel (d) a bar on a pivot
26. 26.⚖️ A seesaw balances. Zoya (? N) sits 2 m from the pivot on one side; Ravi (360 N) sits 3 m from the pivot on the other side. What is the missing weight in newtons?
27. 27.⚖️ Which class of lever is a nutcracker? (a) class 1 (b) class 3 (c) class 2
28. 28.🏋️ A force of 460 N did 1840 J of work. How many metres did the object move?
29. 29.🔍 Which is the odd one out? (a) a wheel on ball bearings (b) a tyre with deep treads (c) skating on ice (d) a smooth steel slide
30. 30.True or false: skating on ice gives less friction. (a) False (b) True
31. 31.💪 In which unit do we measure force? (a) metre (m) (b) litre (L) (c) second (s) (d) newton (N)
32. 32.🛞 Is friction helpful or a problem here: walking without slipping? (a) a problem (b) helpful
33. 33.🪝 Fixed or movable pulley: which one needs effort = load? (a) a fixed pulley (b) a movable pulley
34. 34.💪 Is pulling up your socks a push or a pull? (a) a push (b) a pull
35. 35.🪝 A pulley system has 1 rope section holding up the load. To lift the load by 7 m, how many metres of rope must you pull?
36. 36.⚖️ Going along a lever from one end to the other, the order is: effort, load, fulcrum. Which class of lever is it? (a) class 1 (b) class 2 (c) class 3
37. 37.🪝 A pulley system has 1 rope section holding up the load. To lift the load by 5 m, how many metres of rope must you pull?
38. 38.🪝 A load of 360 N hangs from a pulley system in which 2 rope sections hold up the load. What effort is needed, in newtons? (ideal pulleys)
39. 39.🏋️ A longer ramp to the same height needs … (a) more effort (b) no effort (c) less effort (d) the same effort
40. 40.True or false: a fishing rod is a class 1 lever (fulcrum in the middle). (a) False (b) True

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