Engineering Worksheet: Part 2 Test

Engineering lesson 16: Part 2 test: forces and machines · Set 6 · 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.🏋️ Can a simple machine reduce the work done? (a) yes, always (b) only on Mondays (c) yes, by half (d) no, work stays the same
2. 2.⚖️ Which class of lever is a pair of tweezers? (a) class 1 (b) class 2 (c) class 3
3. 3.🪝 Fixed or movable pulley: which one rises with the load? (a) a fixed pulley (b) a movable pulley
4. 4.🪝 Fixed or movable pulley: which one only changes direction? (a) a fixed pulley (b) a movable pulley
5. 5.🏋️ A force of 370 N did 1850 J of work. How many metres did the object move?
6. 6.🪝 More rope sections holding a load means … (a) more effort needed (b) less effort needed (c) no change (d) the load floats
7. 7.True or false: a movable pulley makes you pull 2× rope. (a) False (b) True
8. 8.⚖️ Along a straight bar, measured from the left end, the effort is at 10 cm, the fulcrum at 70 cm and the load at 50 cm. Which class of lever is it? (a) class 2 (b) class 1 (c) class 3
9. 9.🪝 Fixed or movable pulley: which one hangs on the rope loop? (a) a fixed pulley (b) a movable pulley
10. 10.⚖️ Turning effect = force × … (a) distance from fulcrum (b) time taken (c) colour of bar (d) mass of fulcrum
11. 11.⚖️ A lever balances when … (a) both weights are equal (b) the bar is short (c) the fulcrum moves (d) turning effects match
12. 12.⚖️ Going along a lever from one end to the other, the order is: effort, load, fulcrum. Which class of lever is it? (a) class 3 (b) class 2 (c) class 1
13. 13.⚖️ Which class of lever is a pair of scissors? (a) class 2 (b) class 1 (c) class 3
14. 14.💪 Is pulling a cart a push or a pull? (a) a push (b) a pull
15. 15.🏋️ Pushing a crate 6 m took 1500 J of work. What force was used, in newtons?
16. 16.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 3 N, a wooden plank 7 N, a carpet 11 N, sandpaper 15 N. Which surface gave the most friction? (a) a carpet (b) a glass sheet (c) sandpaper (d) a wooden plank
17. 17.🏋️ Pushing a crate 5 m took 850 J of work. What force was used, in newtons?
18. 18.Which of these is an inclined plane? (a) a well winch handle (b) a claw hammer on a nail (c) a truck loading ramp (d) a seesaw
19. 19.⚖️ A seesaw balances. Kabir (280 N) sits 4 m from the pivot on one side; Arjun (560 N) sits ? m from the pivot on the other side. What is the missing distance in metres?
20. 20.True or false: a movable pulley only changes direction. (a) False (b) True
21. 21.⚖️ In a class 1 lever, what is in the middle? (a) nothing (b) the fulcrum (c) the effort (d) the load
22. 22.🏋️ Mechanical advantage (MA) = … (a) load × effort (b) load ÷ effort (c) load + effort (d) effort ÷ load
23. 23.🛞 More or less friction: oil on a squeaky hinge? (a) less friction (b) more friction
24. 24.⚙️ A screw is really … (a) a ramp wrapped round (b) a bent lever (c) a kind of wheel (d) a tiny pulley
25. 25.🏋️ Work is done when a force moves something … (a) only upwards (b) very slowly (c) through a distance (d) without moving it
26. 26.⚖️ A seesaw balances. Zoya (400 N) sits 2 m from the pivot on one side; Kabir (? N) sits 4 m from the pivot on the other side. What is the missing weight in newtons?
27. 27.🪝 A well winch has a handle (wheel) of radius 8 cm turning an axle of radius 2 cm. What is its mechanical advantage (MA)?
28. 28.⚖️ A seesaw balances. Ravi (? N) sits 1 m from the pivot on one side; Asha (190 N) sits 4 m from the pivot on the other side. What is the missing weight in newtons?
29. 29.⚖️ A lever bar balances. The load is 160 N at ? cm from the fulcrum. The effort is 20 N at 80 cm from the fulcrum on the other side. What is the missing distance in centimetres?
30. 30.🛞 Friction acts … (a) with the motion (b) against the motion (c) only on ice (d) only upwards
31. 31.🏋️ A longer ramp to the same height needs … (a) more effort (b) no effort (c) less effort (d) the same effort
32. 32.⚖️ A lever bar balances. The load is 300 N at 20 cm from the fulcrum. The effort is 120 N at ? cm from the fulcrum on the other side. What is the missing distance in centimetres?
33. 33.⚖️ A seesaw balances. Zoya (800 N) sits ? m from the pivot on one side; Arjun (600 N) sits 4 m from the pivot on the other side. What is the missing distance in metres?
34. 34.⚙️ How many simple machines are there in the usual list? (a) 3 (b) 12 (c) 10 (d) 6
35. 35.🪝 A pulley system lifts a 500 N load with an effort of 250 N. What is its mechanical advantage (MA)?
36. 36.🏋️ A force of 150 N pushes a cart 3 m along the floor. How much work is done, in joules?
37. 37.🪝 A load of 480 N hangs from a pulley system in which 4 rope sections hold up the load. What effort is needed, in newtons? (ideal pulleys)
38. 38.💪 Which force is at work: a rolling ball slows? (a) magnetic force (b) muscular force (c) friction (d) gravity
39. 39.🪝 A well winch has a handle (wheel) of radius 6 cm turning an axle of radius 3 cm. What is its mechanical advantage (MA)?
40. 40.🏋️ In which unit is work measured? (a) metre (m) (b) watt hour (c) newton (N) (d) joule (J)

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