Engineering Worksheet: Part 2 Test

Engineering lesson 16: Part 2 test: forces and machines · Set 609 · 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 of these is a pulley? (a) a nut and bolt (b) a playground slide (c) a bottle opener (d) a window blind cord
2. 2.⚖️ A seesaw balances. Ravi (440 N) sits ? m from the pivot on one side; Zoya (440 N) sits 4 m from the pivot on the other side. What is the missing distance in metres?
3. 3.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 5 N, a carpet 9 N, sandpaper 12 N, ice 1 N. How many newtons more were needed on sandpaper than on ice?
4. 4.💪 A bag has a mass of 3 kg. Taking 1 kg to weigh about 10 N, what is its weight in newtons?
5. 5.💪 Which force pulls everything towards the Earth? (a) wind (b) gravity (c) magnetism (d) friction
6. 6.🪝 A bucket weighing 380 N is lifted with a single fixed pulley at the top of a well. What effort is needed, in newtons? (ideal pulley, no friction)
7. 7.⚖️ In a class 2 lever, what is in the middle? (a) the fulcrum (b) the effort (c) the axle (d) the load
8. 8.⚙️ Which simple machine is a chisel? (a) screw (b) pulley (c) lever (d) wedge
9. 9.🏋️ A smooth ramp is 6 m long and rises 2 m. What effort pushes a 3000 N box up it, in newtons? (ideal ramp, no friction)
10. 10.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 5 N, sandpaper 8 N, a glass sheet 1 N, a wooden plank 3 N. Which surface gave the most friction? (a) sandpaper (b) a wooden plank (c) a carpet (d) a glass sheet
11. 11.⚖️ A seesaw balances. Arjun (? N) sits 2 m from the pivot on one side; Ravi (200 N) sits 1 m from the pivot on the other side. What is the missing weight in newtons?
12. 12.True or false: a fixed pulley stays in one place. (a) True (b) False
13. 13.⚖️ Along a straight bar, measured from the left end, the effort is at 50 cm, the fulcrum at 80 cm and the load at 10 cm. Which class of lever is it? (a) class 1 (b) class 2 (c) class 3
14. 14.🏋️ Can a simple machine reduce the work done? (a) no, work stays the same (b) yes, by half (c) yes, always (d) only on Mondays
15. 15.True or false: a claw hammer on a nail is a lever. (a) False (b) True
16. 16.⚖️ Along a straight bar, measured from the left end, the effort is at 0 cm, the fulcrum at 40 cm and the load at 30 cm. Which class of lever is it? (a) class 3 (b) class 2 (c) class 1
17. 17.True or false: a box pushed on carpet gives less friction. (a) False (b) True
18. 18.⚖️ Which class of lever is a pair of kitchen tongs? (a) class 1 (b) class 3 (c) class 2
19. 19.🪝 A pulley system lifts an 80 N load with an effort of 20 N. What is its mechanical advantage (MA)?
20. 20.True or false: a movable pulley rises with the load. (a) False (b) True
21. 21.⚙️ How many simple machines are there in the usual list? (a) 6 (b) 12 (c) 10 (d) 3
22. 22.🏋️ Pushing a crate 1 m took 300 J of work. What force was used, in newtons?
23. 23.⚖️ A lever balances when … (a) both weights are equal (b) the fulcrum moves (c) the bar is short (d) turning effects match
24. 24.⚙️ Most simple machines make work easier by letting us … (a) use a smaller force (b) make new energy (c) stop all friction (d) switch off gravity
25. 25.🛞 More or less friction: a wheel on ball bearings? (a) less friction (b) more friction
26. 26.💪 Two children push a box to the right, one with 70 N and the other with 70 N. What is the net (total) force on the box, in newtons?
27. 27.💪 Is pulling a cart a push or a pull? (a) a pull (b) a push
28. 28.🪝 A load of 140 N hangs from a pulley system in which 2 rope sections hold up the load. What effort is needed, in newtons? (ideal pulleys)
29. 29.🪝 A pulley system lifts a 520 N load with an effort of 260 N. What is its mechanical advantage (MA)?
30. 30.True or false: powder on a carrom board gives more friction. (a) True (b) False
31. 31.⚖️ Along a straight bar, measured from the left end, the effort is at 50 cm, the fulcrum at 30 cm and the load at 40 cm. Which class of lever is it? (a) class 1 (b) class 3 (c) class 2
32. 32.🔍 Which is the odd one out? (a) a rough doormat (b) a box pushed on carpet (c) powder on a carrom board (d) a grippy rubber sole
33. 33.🪝 A load of 260 N hangs from a pulley system in which 2 rope sections hold up the load. What effort is needed, in newtons? (ideal pulleys)
34. 34.True or false: a tyre with deep treads gives less friction. (a) False (b) True
35. 35.🔍 Which is the odd one out? (a) a road up a hill (b) a steering wheel (c) a round doorknob (d) a well winch handle
36. 36.⚖️ Which class of lever is a seesaw? (a) class 2 (b) class 1 (c) class 3
37. 37.🏋️ A force of 40 N pushes a cart 7 m along the floor. How much work is done, in joules?
38. 38.⚖️ Turning effect = force × … (a) mass of fulcrum (b) time taken (c) distance from fulcrum (d) colour of bar
39. 39.⚖️ A seesaw balances. Asha (220 N) sits 1 m from the pivot on one side; Arjun (? N) sits 2 m from the pivot on the other side. What is the missing weight in newtons?
40. 40.⚖️ A lever bar balances. The load is 300 N at ? cm from the fulcrum. The effort is 100 N at 60 cm from the fulcrum on the other side. What is the missing distance in centimetres?

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