Engineering Worksheet: Part 2 Test

Engineering lesson 16: Part 2 test: forces and machines · Set 81 · 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.True or false: pressing a doorbell is a push. (a) False (b) True
2. 2.🏋️ A force of 250 N did 500 J of work. How many metres did the object move?
3. 3.True or false: a tug of war is a push. (a) True (b) False
4. 4.True or false: a wet tiled floor gives less friction. (a) False (b) True
5. 5.⚖️ Going along a lever from one end to the other, the order is: load, effort, fulcrum. Which class of lever is it? (a) class 1 (b) class 2 (c) class 3
6. 6.🔍 Which is the odd one out? (a) a window blind cord (b) a crane hook block (c) a well-bucket rope wheel (d) a well winch handle
7. 7.True or false: kicking a football is a pull. (a) True (b) False
8. 8.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 7 N, a wooden plank 11 N, sandpaper 12 N, ice 4 N. How many newtons more were needed on sandpaper than on ice?
9. 9.⚖️ A seesaw balances. Zoya (? N) sits 3 m from the pivot on one side; Meena (570 N) sits 3 m from the pivot on the other side. What is the missing weight in newtons?
10. 10.Which of these is caused by muscular force? (a) an apple falls down (b) a thrown ball comes down (c) a rolling ball slows (d) lifting a school bag
11. 11.🪝 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?
12. 12.💪 A force is a … (a) kind of colour (b) push or a pull (c) type of sound (d) unit of time
13. 13.💪 In a tug of war, one team pulls right with 70 N and the other pulls left with 45 N. What is the size of the net force, in newtons?
14. 14.🛞 More or less friction: sand on a slippery path? (a) more friction (b) less friction
15. 15.⚙️ A wedge is … (a) two ramps back to back (b) a wheel on a rod (c) a bar on a pivot (d) a rope on a wheel
16. 16.⚖️ Which class of lever is your forearm? (a) class 1 (b) class 2 (c) class 3
17. 17.🏋️ A longer ramp to the same height needs … (a) no effort (b) less effort (c) more effort (d) the same effort
18. 18.🏋️ Pushing a crate 10 m took 4100 J of work. What force was used, in newtons?
19. 19.🪝 A pulley system lifts a 100 N load with an effort of 50 N. What is its mechanical advantage (MA)?
20. 20.💪 Is pressing a doorbell a push or a pull? (a) a push (b) a pull
21. 21.🪝 A pulley system lifts an 880 N load with an effort of 220 N. What is its mechanical advantage (MA)?
22. 22.⚖️ Along a straight bar, measured from the left end, the effort is at 20 cm, the fulcrum at 50 cm and the load at 40 cm. Which class of lever is it? (a) class 3 (b) class 1 (c) class 2
23. 23.⚖️ Turning effect = force × … (a) time taken (b) mass of fulcrum (c) distance from fulcrum (d) colour of bar
24. 24.🏋️ A machine lifts a load of 80 N when you push with 40 N. What is its mechanical advantage (MA)?
25. 25.⚖️ Along a straight bar, measured from the left end, the effort is at 80 cm, the fulcrum at 20 cm and the load at 60 cm. Which class of lever is it? (a) class 2 (b) class 3 (c) class 1
26. 26.⚖️ A seesaw balances. Kabir (280 N) sits ? m from the pivot on one side; Ravi (140 N) sits 2 m from the pivot on the other side. What is the missing distance in metres?
27. 27.⚖️ Along a straight bar, measured from the left end, the effort is at 30 cm, the fulcrum at 70 cm and the load at 40 cm. Which class of lever is it? (a) class 1 (b) class 2 (c) class 3
28. 28.True or false: a movable pulley only changes direction. (a) True (b) False
29. 29.🏋️ A machine lifts a load of 240 N when you push with 60 N. What is its mechanical advantage (MA)?
30. 30.🛞 More or less friction: a wheel on ball bearings? (a) more friction (b) less friction
31. 31.True or false: plucking a mango is a pull. (a) True (b) False
32. 32.🏋️ A force of 460 N pushes a cart 3 m along the floor. How much work is done, in joules?
33. 33.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 5 N, a carpet 8 N, ice 1 N, a glass sheet 3 N. How many newtons more were needed on a carpet than on ice?
34. 34.🔍 Which is the odd one out? (a) oil on a squeaky hinge (b) chalk on a gym bar (c) a wheel on ball bearings (d) a smooth steel slide
35. 35.True or false: sand on a slippery path gives more friction. (a) True (b) False
36. 36.🔍 Which is the odd one out? (a) a smooth steel slide (b) a rough doormat (c) powder on a carrom board (d) oil on a squeaky hinge
37. 37.Which of these is a pulley? (a) a playground slide (b) a chisel (c) a knife edge (d) a window blind cord
38. 38.🪝 A wheel and axle is a big wheel fixed to … (a) a sharp wedge (b) a loose rope (c) a flat ramp (d) a smaller rod (axle)
39. 39.⚖️ Along a straight bar, measured from the left end, the effort is at 40 cm, the fulcrum at 80 cm and the load at 20 cm. Which class of lever is it? (a) class 1 (b) class 2 (c) class 3
40. 40.🔍 Which is the odd one out? (a) a wet tiled floor (b) a wheel on ball bearings (c) skating on ice (d) a grippy rubber sole

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