Engineering Worksheet: Part 2 Test

Engineering lesson 16: Part 2 test: forces and machines · Set 245 · 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.🏋️ Mechanical advantage (MA) = … (a) load + effort (b) load ÷ effort (c) load × effort (d) effort ÷ load
2. 2.🪝 Fixed or movable pulley: which one rises with the load? (a) a movable pulley (b) a fixed pulley
3. 3.⚖️ Turning effect = force × … (a) time taken (b) colour of bar (c) mass of fulcrum (d) distance from fulcrum
4. 4.💪 Is kicking a football a push or a pull? (a) a push (b) a pull
5. 5.⚖️ A seesaw balances. Zoya (480 N) sits 2 m from the pivot on one side; Ravi (? N) sits 4 m from the pivot on the other side. What is the missing weight in newtons?
6. 6.🏋️ A longer ramp to the same height needs … (a) no effort (b) less effort (c) more effort (d) the same effort
7. 7.🪝 Fixed or movable pulley: which one hangs on the rope loop? (a) a movable pulley (b) a fixed pulley
8. 8.⚖️ A seesaw balances. Kabir (200 N) sits ? m from the pivot on one side; Arjun (600 N) sits 1 m from the pivot on the other side. What is the missing distance in metres?
9. 9.True or false: a movable pulley hangs on the rope loop. (a) False (b) True
10. 10.True or false: a wheelchair ramp is an inclined plane. (a) True (b) False
11. 11.⚙️ Which simple machine is a round doorknob? (a) wheel and axle (b) screw (c) lever (d) pulley
12. 12.🪝 A bucket weighing 150 N is lifted with a single fixed pulley at the top of a well. What effort is needed, in newtons? (ideal pulley, no friction)
13. 13.Which of these is a wheel and axle? (a) a wheelchair ramp (b) a bottle opener (c) a round doorknob (d) a door stopper
14. 14.⚖️ On a seesaw, a heavier child should sit … (a) farther from the pivot (b) anywhere (c) on the pivot (d) closer to the pivot
15. 15.Which of these is caused by gravity? (a) squeezing a lemon (b) a river flows downhill (c) rubbing hands warms them (d) a compass needle turns
16. 16.True or false: a fixed pulley is on a flagpole top. (a) True (b) False
17. 17.⚖️ A lever bar balances. The load is ? N at 10 cm from the fulcrum. The effort is 20 N at 30 cm from the fulcrum on the other side. What is the missing force in newtons?
18. 18.Which of these is a wedge? (a) an axe blade (b) a claw hammer on a nail (c) a jar lid (d) a truck loading ramp
19. 19.🏋️ Can a simple machine reduce the work done? (a) yes, always (b) yes, by half (c) only on Mondays (d) no, work stays the same
20. 20.True or false: a movable pulley only changes direction. (a) False (b) True
21. 21.💪 Which force is at work: lifting a school bag? (a) muscular force (b) friction (c) gravity (d) magnetic force
22. 22.⚙️ Which simple machine is a wheelchair ramp? (a) inclined plane (b) wheel and axle (c) screw (d) wedge
23. 23.🪝 A winch has a wheel of radius 16 cm and an axle of radius 2 cm. What effort on the wheel lifts a 1600 N bucket on the axle, in newtons? (ideal)
24. 24.🛞 How can we reduce friction in a machine? (a) add sand (b) press parts harder (c) make parts rough (d) oil the moving parts
25. 25.⚖️ A seesaw balances. Kabir (450 N) sits ? m from the pivot on one side; Meena (300 N) sits 3 m from the pivot on the other side. What is the missing distance in metres?
26. 26.🏋️ In which unit is work measured? (a) metre (m) (b) newton (N) (c) watt hour (d) joule (J)
27. 27.🛞 More or less friction: skating on ice? (a) more friction (b) less friction
28. 28.⚖️ Which class of lever is your forearm? (a) class 2 (b) class 1 (c) class 3
29. 29.True or false: a movable pulley makes you pull 2× rope. (a) True (b) False
30. 30.🏋️ Pushing a crate 9 m took 900 J of work. What force was used, in newtons?
31. 31.🪝 What does a single fixed pulley change? (a) the colour of rope (b) the direction of pull (c) gravity (d) the size of the load
32. 32.True or false: oil on a squeaky hinge gives more friction. (a) True (b) False
33. 33.💪 Which can a force NOT do? (a) stop it moving (b) change its colour (c) start it moving (d) change its shape
34. 34.⚖️ A lever bar balances. The load is ? N at 40 cm from the fulcrum. The effort is 320 N at 20 cm from the fulcrum on the other side. What is the missing force in newtons?
35. 35.💪 A force is a … (a) type of sound (b) kind of colour (c) unit of time (d) push or a pull
36. 36.⚖️ Along a straight bar, measured from the left end, the effort is at 70 cm, the fulcrum at 10 cm and the load at 40 cm. Which class of lever is it? (a) class 2 (b) class 3 (c) class 1
37. 37.⚖️ A seesaw balances. Kabir (540 N) sits 2 m from the pivot on one side; Asha (360 N) sits ? m from the pivot on the other side. What is the missing distance in metres?
38. 38.🪝 A well winch has a handle (wheel) of radius 6 cm turning an axle of radius 2 cm. What is its mechanical advantage (MA)?
39. 39.🛞 More or less friction: a rough doormat? (a) more friction (b) less friction
40. 40.⚙️ Most simple machines make work easier by letting us … (a) switch off gravity (b) use a smaller force (c) make new energy (d) stop all friction

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