Engineering Worksheet: Part 2 Test

Engineering lesson 16: Part 2 test: forces and machines · Set 72 · 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.💪 Is pulling a cart a push or a pull? (a) a pull (b) a push
2. 2.🪝 A load of 260 N hangs from a pulley system in which 2 rope sections hold up the load. What effort is needed, in newtons? (ideal pulleys)
3. 3.True or false: a nutcracker is a pulley. (a) True (b) False
4. 4.🪝 Fixed or movable pulley: which one stays in one place? (a) a movable pulley (b) a fixed pulley
5. 5.🛞 Rubbing your hands fast makes them … (a) warm (b) magnetic (c) cold (d) wet
6. 6.💪 Is closing a drawer a push or a pull? (a) a pull (b) a push
7. 7.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 8 N, a carpet 10 N, sandpaper 14 N, a glass sheet 4 N. Which surface gave the most friction? (a) a wooden plank (b) a carpet (c) sandpaper (d) a glass sheet
8. 8.🛞 More or less friction: a rough doormat? (a) more friction (b) less friction
9. 9.⚖️ A seesaw balances. Asha (? N) sits 2 m from the pivot on one side; Kabir (200 N) sits 3 m from the pivot on the other side. What is the missing weight in newtons?
10. 10.⚖️ Along a straight bar, measured from the left end, the effort is at 30 cm, the fulcrum at 10 cm and the load at 40 cm. Which class of lever is it? (a) class 1 (b) class 3 (c) class 2
11. 11.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 4 N, a wooden plank 7 N, a carpet 9 N, ice 3 N. How many newtons more were needed on a carpet than on ice?
12. 12.True or false: the tip of a nail is a wedge. (a) False (b) True
13. 13.🏋️ A force of 90 N pushes a cart 9 m along the floor. How much work is done, in joules?
14. 14.🛞 Is friction helpful or a problem here: striking a matchstick? (a) helpful (b) a problem
15. 15.⚖️ A lever bar balances. The load is ? N at 50 cm from the fulcrum. The effort is 250 N at 20 cm from the fulcrum on the other side. What is the missing force in newtons?
16. 16.Which of these is caused by gravity? (a) pedalling a cycle (b) brakes stop a bicycle (c) a thrown ball comes down (d) a magnet picks up pins
17. 17.🪝 A pulley system lifts a 460 N load with an effort of 230 N. What is its mechanical advantage (MA)?
18. 18.🛞 More or less friction: powder on a carrom board? (a) less friction (b) more friction
19. 19.🪝 Fixed or movable pulley: which one halves the effort? (a) a movable pulley (b) a fixed pulley
20. 20.⚖️ A lever balances when … (a) turning effects match (b) the fulcrum moves (c) both weights are equal (d) the bar is short
21. 21.True or false: a water tap handle is a wheel and axle. (a) False (b) True
22. 22.⚖️ In a class 2 lever, what is in the middle? (a) the load (b) the axle (c) the effort (d) the fulcrum
23. 23.⚙️ Most simple machines make work easier by letting us … (a) make new energy (b) stop all friction (c) switch off gravity (d) use a smaller force
24. 24.⚙️ Which simple machine is a bottle cap? (a) screw (b) lever (c) pulley (d) wedge
25. 25.🔍 Which is the odd one out? (a) a water tap handle (b) a bottle opener (c) a seesaw (d) a claw hammer on a nail
26. 26.🏋️ A machine lifts a load of 760 N when you push with 190 N. What is its mechanical advantage (MA)?
27. 27.True or false: a nut and bolt is a screw. (a) False (b) True
28. 28.💪 Is pushing a trolley a push or a pull? (a) a push (b) a pull
29. 29.🔍 Which is the odd one out? (a) a box pushed on carpet (b) a grippy rubber sole (c) chalk on a gym bar (d) oil on a squeaky hinge
30. 30.🏋️ Can a simple machine reduce the work done? (a) no, work stays the same (b) only on Mondays (c) yes, always (d) yes, by half
31. 31.🪝 A winch has a wheel of radius 7 cm and an axle of radius 1 cm. What effort on the wheel lifts a 1050 N bucket on the axle, in newtons? (ideal)
32. 32.🏋️ A force of 500 N pushes a cart 7 m along the floor. How much work is done, in joules?
33. 33.🏋️ Pushing a crate 9 m took 1980 J of work. What force was used, in newtons?
34. 34.🛞 More or less friction: a wheel on ball bearings? (a) more friction (b) less friction
35. 35.⚖️ Along a straight bar, measured from the left end, the effort is at 70 cm, the fulcrum at 60 cm and the load at 20 cm. Which class of lever is it? (a) class 2 (b) class 3 (c) class 1
36. 36.⚖️ In a class 1 lever, what is in the middle? (a) the load (b) the effort (c) the fulcrum (d) nothing
37. 37.True or false: a beam balance is a class 3 lever (effort in the middle). (a) True (b) False
38. 38.True or false: a jar lid is a pulley. (a) True (b) False
39. 39.⚖️ On a seesaw, a heavier child should sit … (a) anywhere (b) on the pivot (c) closer to the pivot (d) farther from the pivot
40. 40.⚖️ Which class of lever is a seesaw? (a) class 3 (b) class 2 (c) class 1

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