Engineering Worksheet: Part 2 Test

Engineering lesson 16: Part 2 test: forces and machines · Set 353 · 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 pulley system has 4 rope sections holding up the load. To lift the load by 2 m, how many metres of rope must you pull?
2. 2.⚖️ Turning effect = force × … (a) time taken (b) colour of bar (c) mass of fulcrum (d) distance from fulcrum
3. 3.⚖️ A lever bar balances. The load is 240 N at 20 cm from the fulcrum. The effort is ? N at 80 cm from the fulcrum on the other side. What is the missing force in newtons?
4. 4.🔍 Which is the odd one out? (a) a water tap handle (b) a round doorknob (c) the tip of a nail (d) a well winch handle
5. 5.🛞 More or less friction: a wet tiled floor? (a) less friction (b) more friction
6. 6.🪝 What does a single fixed pulley change? (a) the colour of rope (b) the size of the load (c) the direction of pull (d) gravity
7. 7.⚙️ Which simple machine is a truck loading ramp? (a) screw (b) pulley (c) wedge (d) inclined plane
8. 8.⚙️ A wedge is … (a) a rope on a wheel (b) a wheel on a rod (c) a bar on a pivot (d) two ramps back to back
9. 9.True or false: a movable pulley needs effort = load. (a) False (b) True
10. 10.⚖️ A seesaw balances. Ravi (200 N) sits ? m from the pivot on one side; Arjun (400 N) sits 1 m from the pivot on the other side. What is the missing distance in metres?
11. 11.⚖️ A seesaw balances. Zoya (360 N) sits 2 m from the pivot on one side; Meena (240 N) sits ? m from the pivot on the other side. What is the missing distance in metres?
12. 12.💪 Two children push a box to the right, one with 80 N and the other with 15 N. What is the net (total) force on the box, in newtons?
13. 13.💪 A cart is pulled to the right with 25 N and to the left with 40 N. Which way does the net force act? (a) to the right (b) no net force (c) to the left
14. 14.⚖️ Along a straight bar, measured from the left end, the effort is at 10 cm, the fulcrum at 50 cm and the load at 30 cm. Which class of lever is it? (a) class 3 (b) class 1 (c) class 2
15. 15.🪝 A bucket weighing 230 N is lifted with a single fixed pulley at the top of a well. What effort is needed, in newtons? (ideal pulley, no friction)
16. 16.⚖️ Along a straight bar, measured from the left end, the effort is at 20 cm, the fulcrum at 40 cm and the load at 60 cm. Which class of lever is it? (a) class 3 (b) class 2 (c) class 1
17. 17.⚖️ A lever bar balances. The load is 40 N at ? cm from the fulcrum. The effort is 20 N at 40 cm from the fulcrum on the other side. What is the missing distance in centimetres?
18. 18.🛞 Is friction helpful or a problem here: writing with a pencil? (a) helpful (b) a problem
19. 19.🪝 A load of 240 N hangs from a pulley system in which 3 rope sections hold up the load. What effort is needed, in newtons? (ideal pulleys)
20. 20.🏋️ In which unit is work measured? (a) watt hour (b) newton (N) (c) joule (J) (d) metre (m)
21. 21.True or false: a movable pulley is on a flagpole top. (a) True (b) False
22. 22.🪝 Fixed or movable pulley: which one is on a flagpole top? (a) a fixed pulley (b) a movable pulley
23. 23.🪝 A load of 300 N hangs from a pulley system in which 2 rope sections hold up the load. What effort is needed, in newtons? (ideal pulleys)
24. 24.💪 Which force pulls everything towards the Earth? (a) friction (b) wind (c) gravity (d) magnetism
25. 25.True or false: a box pushed on carpet gives more friction. (a) False (b) True
26. 26.⚖️ A seesaw balances. Meena (520 N) sits 2 m from the pivot on one side; Asha (260 N) sits ? m from the pivot on the other side. What is the missing distance in metres?
27. 27.True or false: a broom when sweeping is a class 3 lever (effort in the middle). (a) True (b) False
28. 28.🏋️ Can a simple machine reduce the work done? (a) no, work stays the same (b) yes, by half (c) only on Mondays (d) yes, always
29. 29.🛞 Is friction helpful or a problem here: dragging a heavy box? (a) helpful (b) a problem
30. 30.🛞 More or less friction: chalk on a gym bar? (a) less friction (b) more friction
31. 31.🏋️ A force of 60 N pushes a cart 9 m along the floor. How much work is done, in joules?
32. 32.⚖️ A seesaw balances. Kabir (? N) sits 2 m from the pivot on one side; Ravi (400 N) sits 2 m from the pivot on the other side. What is the missing weight in newtons?
33. 33.🪝 A bucket weighing 240 N is lifted with a single fixed pulley at the top of a well. What effort is needed, in newtons? (ideal pulley, no friction)
34. 34.💪 Is closing a drawer a push or a pull? (a) a push (b) a pull
35. 35.⚖️ A seesaw balances. Kabir (480 N) sits ? m from the pivot on one side; Arjun (160 N) sits 3 m from the pivot on the other side. What is the missing distance in metres?
36. 36.💪 In which unit do we measure force? (a) litre (L) (b) newton (N) (c) second (s) (d) metre (m)
37. 37.⚖️ Along a straight bar, measured from the left end, the effort is at 70 cm, the fulcrum at 50 cm and the load at 10 cm. Which class of lever is it? (a) class 1 (b) class 2 (c) class 3
38. 38.💪 Which force is at work: lifting a school bag? (a) gravity (b) magnetic force (c) friction (d) muscular force
39. 39.🪝 Fixed or movable pulley: which one needs effort = load? (a) a movable pulley (b) a fixed pulley
40. 40.💪 Which force is at work: an apple falls down? (a) friction (b) muscular force (c) magnetic force (d) gravity

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