Engineering Worksheet: Part 2 Test

Engineering lesson 16: Part 2 test: forces and machines · Set 633 · 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 simple machine is a nutcracker? (a) pulley (b) lever (c) screw (d) inclined plane
2. 2.True or false: chalk on a gym bar gives less friction. (a) True (b) False
3. 3.🛞 More or less friction: a wet tiled floor? (a) more friction (b) less friction
4. 4.🪝 Fixed or movable pulley: which one only changes direction? (a) a fixed pulley (b) a movable pulley
5. 5.🪝 A pulley system lifts a 1200 N load with an effort of 300 N. What is its mechanical advantage (MA)?
6. 6.💪 Two children push a box to the right, one with 10 N and the other with 75 N. What is the net (total) force on the box, in newtons?
7. 7.🏋️ Pushing a crate 1 m took 280 J of work. What force was used, in newtons?
8. 8.🪝 A load of 180 N hangs from a pulley system in which 3 rope sections hold up the load. What effort is needed, in newtons? (ideal pulleys)
9. 9.Which of these is a screw? (a) a knife edge (b) a wheelchair ramp (c) a bottle opener (d) a screw jack
10. 10.True or false: kicking a football is a push. (a) False (b) True
11. 11.Which of these is a wheel and axle? (a) a round doorknob (b) a nut and bolt (c) the tip of a nail (d) a screw jack
12. 12.True or false: a crowbar is a class 2 lever (load in the middle). (a) True (b) False
13. 13.True or false: skating on ice gives less friction. (a) True (b) False
14. 14.True or false: a nut and bolt is a pulley. (a) True (b) False
15. 15.⚖️ Along a straight bar, measured from the left end, the effort is at 20 cm, the fulcrum at 50 cm and the load at 60 cm. Which class of lever is it? (a) class 2 (b) class 3 (c) class 1
16. 16.🪝 Fixed or movable pulley: which one makes you pull 2× rope? (a) a fixed pulley (b) a movable pulley
17. 17.Which of these is caused by friction? (a) rain falls to the ground (b) a thrown ball comes down (c) a rolling ball slows (d) a fridge magnet sticks
18. 18.⚖️ Along a straight bar, measured from the left end, the effort is at 90 cm, the fulcrum at 10 cm and the load at 50 cm. Which class of lever is it? (a) class 1 (b) class 2 (c) class 3
19. 19.⚖️ Going along a lever from one end to the other, the order is: fulcrum, effort, load. Which class of lever is it? (a) class 1 (b) class 2 (c) class 3
20. 20.⚙️ A wedge is … (a) a wheel on a rod (b) a bar on a pivot (c) a rope on a wheel (d) two ramps back to back
21. 21.💪 Is pushing a swing a push or a pull? (a) a push (b) a pull
22. 22.💪 Which force is at work: pedalling a cycle? (a) gravity (b) friction (c) muscular force (d) magnetic force
23. 23.🪝 A well winch has a handle (wheel) of radius 8 cm turning an axle of radius 2 cm. What is its mechanical advantage (MA)?
24. 24.⚖️ A lever bar balances. The load is 240 N at ? cm from the fulcrum. The effort is 80 N at 30 cm from the fulcrum on the other side. What is the missing distance in centimetres?
25. 25.⚖️ A seesaw balances. Kabir (540 N) sits 4 m from the pivot on one side; Meena (? N) sits 3 m from the pivot on the other side. What is the missing weight in newtons?
26. 26.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 1 N, a wooden plank 3 N, a carpet 6 N, sandpaper 9 N. How many newtons more were needed on sandpaper than on a glass sheet?
27. 27.⚖️ Which class of lever is a pair of scissors? (a) class 1 (b) class 3 (c) class 2
28. 28.🏋️ Can a simple machine reduce the work done? (a) only on Mondays (b) yes, always (c) no, work stays the same (d) yes, by half
29. 29.⚖️ Turning effect = force × … (a) time taken (b) colour of bar (c) mass of fulcrum (d) distance from fulcrum
30. 30.🪝 A wheel and axle is a big wheel fixed to … (a) a sharp wedge (b) a loose rope (c) a smaller rod (axle) (d) a flat ramp
31. 31.💪 Is pulling up your socks a push or a pull? (a) a pull (b) a push
32. 32.🏋️ A force of 80 N pushes a cart 1 m along the floor. How much work is done, in joules?
33. 33.⚖️ Going along a lever from one end to the other, the order is: effort, fulcrum, load. Which class of lever is it? (a) class 2 (b) class 1 (c) class 3
34. 34.⚖️ Which class of lever is a pair of tweezers? (a) class 1 (b) class 3 (c) class 2
35. 35.🪝 A load of 600 N hangs from a pulley system in which 2 rope sections hold up the load. What effort is needed, in newtons? (ideal pulleys)
36. 36.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 8 N, sandpaper 12 N, a glass sheet 3 N, a wooden plank 7 N. Which surface gave the most friction? (a) a carpet (b) a glass sheet (c) sandpaper (d) a wooden plank
37. 37.True or false: a movable pulley only changes direction. (a) False (b) True
38. 38.💪 Which force is at work: lifting a school bag? (a) friction (b) gravity (c) magnetic force (d) muscular force
39. 39.⚖️ In a class 1 lever, what is in the middle? (a) the effort (b) the load (c) nothing (d) the fulcrum
40. 40.💪 Is plucking a mango a push or a pull? (a) a push (b) a pull

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