Engineering Worksheet: Part 2 Test

Engineering lesson 16: Part 2 test: forces and machines · Set 164 · 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 load of 960 N hangs from a pulley system in which 4 rope sections hold up the load. What effort is needed, in newtons? (ideal pulleys)
2. 2.🏋️ Pushing a crate 2 m took 280 J of work. What force was used, in newtons?
3. 3.🏋️ Pushing a crate 2 m took 720 J of work. What force was used, in newtons?
4. 4.⚖️ Which class of lever is a seesaw? (a) class 3 (b) class 2 (c) class 1
5. 5.🛞 Is friction helpful or a problem here: brakes stopping a cycle? (a) a problem (b) helpful
6. 6.💪 Two equal forces push on a box from opposite sides. They are … (a) balanced (b) gravity (c) doubled (d) unbalanced
7. 7.True or false: sand on a slippery path gives less friction. (a) True (b) False
8. 8.⚖️ Turning effect = force × … (a) distance from fulcrum (b) mass of fulcrum (c) time taken (d) colour of bar
9. 9.🏋️ A 19 kg box is lifted straight up by 3 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
10. 10.💪 Which force pulls everything towards the Earth? (a) wind (b) magnetism (c) gravity (d) friction
11. 11.🏋️ Mechanical advantage (MA) = … (a) effort ÷ load (b) load × effort (c) load + effort (d) load ÷ effort
12. 12.🛞 Is friction helpful or a problem here: tyres wearing down? (a) a problem (b) helpful
13. 13.🔍 Which is the odd one out? (a) the tip of a nail (b) a knife edge (c) a truck loading ramp (d) an axe blade
14. 14.🏋️ Pushing a crate 9 m took 2340 J of work. What force was used, in newtons?
15. 15.True or false: a movable pulley stays in one place. (a) False (b) True
16. 16.⚖️ A seesaw balances. Arjun (100 N) sits 1 m from the pivot on one side; Kabir (? N) sits 1 m from the pivot on the other side. What is the missing weight in newtons?
17. 17.⚙️ A screw is really … (a) a bent lever (b) a ramp wrapped round (c) a tiny pulley (d) a kind of wheel
18. 18.⚖️ A lever balances when … (a) the bar is short (b) both weights are equal (c) turning effects match (d) the fulcrum moves
19. 19.⚖️ Along a straight bar, measured from the left end, the effort is at 60 cm, the fulcrum at 0 cm and the load at 40 cm. Which class of lever is it? (a) class 3 (b) class 2 (c) class 1
20. 20.💪 A force is a … (a) type of sound (b) kind of colour (c) unit of time (d) push or a pull
21. 21.🪝 A pulley system lifts a 300 N load with an effort of 100 N. What is its mechanical advantage (MA)?
22. 22.🪝 Fixed or movable pulley: which one rises with the load? (a) a movable pulley (b) a fixed pulley
23. 23.🔍 Which is the odd one out? (a) a seesaw (b) a crowbar (c) the tip of a nail (d) a bottle opener
24. 24.🪝 Fixed or movable pulley: which one stays in one place? (a) a movable pulley (b) a fixed pulley
25. 25.True or false: a bottle opener is a lever. (a) True (b) False
26. 26.True or false: pressing a doorbell is a pull. (a) False (b) True
27. 27.True or false: a wet tiled floor gives less friction. (a) True (b) False
28. 28.⚙️ Which simple machine is a wood screw? (a) screw (b) pulley (c) lever (d) inclined plane
29. 29.🛞 More or less friction: a smooth steel slide? (a) more friction (b) less friction
30. 30.🪝 A wheel and axle is a big wheel fixed to … (a) a smaller rod (axle) (b) a flat ramp (c) a loose rope (d) a sharp wedge
31. 31.True or false: a tyre with deep treads gives less friction. (a) True (b) False
32. 32.🏋️ In which unit is work measured? (a) joule (J) (b) watt hour (c) newton (N) (d) metre (m)
33. 33.🛞 Which surface gives the MOST friction to a sliding block? (a) polished marble (b) sandpaper (c) glass (d) ice
34. 34.🏋️ A force of 190 N did 380 J of work. How many metres did the object move?
35. 35.⚖️ Along a straight bar, measured from the left end, the effort is at 70 cm, the fulcrum at 30 cm and the load at 80 cm. Which class of lever is it? (a) class 1 (b) class 3 (c) class 2
36. 36.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 8 N, ice 1 N, a glass sheet 4 N, a wooden plank 7 N. How many newtons more were needed on a carpet than on ice?
37. 37.True or false: a wet tiled floor gives more friction. (a) True (b) False
38. 38.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 1 N, a glass sheet 3 N, a wooden plank 6 N, a carpet 8 N. Which surface gave the most friction? (a) a carpet (b) a glass sheet (c) ice (d) a wooden plank
39. 39.⚖️ Which class of lever is a pair of kitchen tongs? (a) class 2 (b) class 1 (c) class 3
40. 40.Which of these is caused by magnetic force? (a) a river flows downhill (b) an apple falls down (c) rain falls to the ground (d) a compass needle turns

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