Engineering Worksheet: Part 2 Test

Engineering lesson 16: Part 2 test: forces and machines · Set 446 · 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.⚖️ In a class 2 lever, what is in the middle? (a) the axle (b) the load (c) the fulcrum (d) the effort
2. 2.🪝 Fixed or movable pulley: which one is on a flagpole top? (a) a movable pulley (b) a fixed pulley
3. 3.💪 A box weighs 200 N. Taking 1 kg to weigh about 10 N, what is its mass in kilograms?
4. 4.⚖️ Which class of lever is a pair of pliers? (a) class 2 (b) class 3 (c) class 1
5. 5.🏋️ A longer ramp to the same height needs … (a) less effort (b) the same effort (c) more effort (d) no effort
6. 6.True or false: a movable pulley is on a flagpole top. (a) False (b) True
7. 7.⚙️ A wedge is … (a) a bar on a pivot (b) two ramps back to back (c) a rope on a wheel (d) a wheel on a rod
8. 8.💪 Is pressing a doorbell a push or a pull? (a) a push (b) a pull
9. 9.⚖️ A seesaw balances. Ravi (? N) sits 3 m from the pivot on one side; Meena (420 N) sits 1 m from the pivot on the other side. What is the missing weight in newtons?
10. 10.⚙️ Which simple machine is a flagpole rope wheel? (a) screw (b) pulley (c) inclined plane (d) wedge
11. 11.⚙️ Which simple machine is an axe blade? (a) wedge (b) pulley (c) lever (d) inclined plane
12. 12.⚖️ A lever bar balances. The load is ? N at 50 cm from the fulcrum. The effort is 50 N at 50 cm from the fulcrum on the other side. What is the missing force in newtons?
13. 13.Which of these is caused by muscular force? (a) a compass needle turns (b) a magnet picks up pins (c) squeezing a lemon (d) a fridge magnet sticks
14. 14.🏋️ Can a simple machine reduce the work done? (a) yes, always (b) yes, by half (c) no, work stays the same (d) only on Mondays
15. 15.🛞 More or less friction: a rough doormat? (a) more friction (b) less friction
16. 16.True or false: a well-bucket rope wheel is a wheel and axle. (a) False (b) True
17. 17.🛞 More or less friction: a wheel on ball bearings? (a) less friction (b) more friction
18. 18.⚙️ Most simple machines make work easier by letting us … (a) make new energy (b) use a smaller force (c) switch off gravity (d) stop all friction
19. 19.💪 A cart is pulled to the right with 35 N and to the left with 20 N. Which way does the net force act? (a) to the left (b) to the right (c) no net force
20. 20.🏋️ A smooth ramp is 6 m long and rises 1 m. What effort pushes a 2700 N box up it, in newtons? (ideal ramp, no friction)
21. 21.⚖️ A seesaw balances. Meena (330 N) sits 4 m from the pivot on one side; Arjun (440 N) sits ? m from the pivot on the other side. What is the missing distance in metres?
22. 22.True or false: a seesaw is a class 2 lever (load in the middle). (a) True (b) False
23. 23.🔍 Which is the odd one out? (a) a door stopper (b) a flagpole rope wheel (c) a well-bucket rope wheel (d) a crane hook block
24. 24.⚙️ Which simple machine is a seesaw? (a) wheel and axle (b) lever (c) wedge (d) pulley
25. 25.🛞 Is friction helpful or a problem here: tyres wearing down? (a) a problem (b) helpful
26. 26.⚖️ Along a straight bar, measured from the left end, the effort is at 30 cm, the fulcrum at 70 cm and the load at 0 cm. Which class of lever is it? (a) class 2 (b) class 3 (c) class 1
27. 27.Which of these is a pulley? (a) a round doorknob (b) a well-bucket rope wheel (c) a steering wheel (d) a chisel
28. 28.⚖️ On a seesaw, a heavier child should sit … (a) closer to the pivot (b) on the pivot (c) anywhere (d) farther from the pivot
29. 29.⚖️ Which class of lever is a broom when sweeping? (a) class 1 (b) class 3 (c) class 2
30. 30.⚖️ Turning effect = force × … (a) colour of bar (b) mass of fulcrum (c) distance from fulcrum (d) time taken
31. 31.True or false: powder on a carrom board gives less friction. (a) False (b) True
32. 32.🏋️ A force of 160 N pushes a cart 2 m along the floor. How much work is done, in joules?
33. 33.True or false: pulling up your socks is a push. (a) True (b) False
34. 34.🏋️ A smooth ramp is 4 m long and rises 2 m. What effort pushes a 1300 N box up it, in newtons? (ideal ramp, no friction)
35. 35.⚙️ Which simple machine is a well winch handle? (a) screw (b) inclined plane (c) wheel and axle (d) lever
36. 36.⚖️ A seesaw balances. Arjun (? N) sits 3 m from the pivot on one side; Meena (510 N) sits 3 m from the pivot on the other side. What is the missing weight in newtons?
37. 37.💪 A cart is pulled to the right with 20 N and to the left with 15 N. Which way does the net force act? (a) to the left (b) to the right (c) no net force
38. 38.💪 Is drawing up a well bucket a push or a pull? (a) a pull (b) a push
39. 39.⚖️ A seesaw balances. Kabir (110 N) sits 1 m from the pivot on one side; Meena (110 N) sits ? m from the pivot on the other side. What is the missing distance in metres?
40. 40.⚖️ Along a straight bar, measured from the left end, the effort is at 30 cm, the fulcrum at 0 cm and the load at 20 cm. Which class of lever is it? (a) class 3 (b) class 1 (c) class 2

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