Engineering Worksheet: Part 2 Test

Engineering lesson 16: Part 2 test: forces and machines · Set 686 · 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.💪 Two children push a box to the right, one with 35 N and the other with 100 N. What is the net (total) force on the box, in newtons?
2. 2.⚙️ How many simple machines are there in the usual list? (a) 10 (b) 6 (c) 3 (d) 12
3. 3.True or false: a well-bucket rope wheel is a wheel and axle. (a) True (b) False
4. 4.🛞 Is friction helpful or a problem here: brakes stopping a cycle? (a) a problem (b) helpful
5. 5.🏋️ An 11 kg box is lifted straight up by 5 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
6. 6.🏋️ A machine lifts a load of 50 N when you push with 10 N. What is its mechanical advantage (MA)?
7. 7.🛞 Is friction helpful or a problem here: a knot holding a rope? (a) helpful (b) a problem
8. 8.⚙️ Which simple machine is an axe blade? (a) wheel and axle (b) lever (c) pulley (d) wedge
9. 9.💪 Which can a force NOT do? (a) start it moving (b) stop it moving (c) change its shape (d) change its colour
10. 10.⚖️ Along a straight bar, measured from the left end, the effort is at 20 cm, the fulcrum at 60 cm and the load at 70 cm. Which class of lever is it? (a) class 1 (b) class 2 (c) class 3
11. 11.Which of these is a wedge? (a) a round doorknob (b) a window blind cord (c) a nutcracker (d) a door stopper
12. 12.⚖️ In a class 2 lever, what is in the middle? (a) the load (b) the fulcrum (c) the axle (d) the effort
13. 13.🏋️ Pushing a crate 2 m took 440 J of work. What force was used, in newtons?
14. 14.⚙️ Which simple machine is a bottle opener? (a) pulley (b) wheel and axle (c) screw (d) lever
15. 15.💪 Is opening a drawer a push or a pull? (a) a pull (b) a push
16. 16.🛞 More or less friction: a wet tiled floor? (a) less friction (b) more friction
17. 17.True or false: a wet tiled floor gives less friction. (a) True (b) False
18. 18.⚙️ Which simple machine is a steering wheel? (a) screw (b) wheel and axle (c) wedge (d) lever
19. 19.🪝 A wheel and axle is a big wheel fixed to … (a) a sharp wedge (b) a loose rope (c) a flat ramp (d) a smaller rod (axle)
20. 20.🪝 A bucket weighing 160 N is lifted with a single fixed pulley at the top of a well. What effort is needed, in newtons? (ideal pulley, no friction)
21. 21.🔍 Which is the odd one out? (a) a grippy rubber sole (b) a tyre with deep treads (c) skating on ice (d) a box pushed on carpet
22. 22.True or false: hitting a cricket ball is a push. (a) True (b) False
23. 23.⚖️ A seesaw balances. Zoya (190 N) sits 1 m from the pivot on one side; Asha (190 N) sits ? m from the pivot on the other side. What is the missing distance in metres?
24. 24.🪝 A pulley system has 3 rope sections holding up the load. To lift the load by 9 m, how many metres of rope must you pull?
25. 25.True or false: a wheel on ball bearings gives less friction. (a) False (b) True
26. 26.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 6 N, a carpet 7 N, sandpaper 9 N, ice 3 N. How many newtons more were needed on sandpaper than on ice?
27. 27.🏋️ A 13 kg box is lifted straight up by 1 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
28. 28.Which of these is caused by gravity? (a) a fridge magnet sticks (b) a magnet picks up pins (c) a thrown ball comes down (d) brakes stop a bicycle
29. 29.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 9 N, sandpaper 11 N, ice 3 N, a glass sheet 5 N. Which surface gave the least friction? (a) a glass sheet (b) sandpaper (c) a wooden plank (d) ice
30. 30.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 4 N, a wooden plank 8 N, sandpaper 11 N, ice 1 N. How many newtons more were needed on sandpaper than on ice?
31. 31.⚖️ On a seesaw, a heavier child should sit … (a) closer to the pivot (b) farther from the pivot (c) on the pivot (d) anywhere
32. 32.🔍 Which is the odd one out? (a) sand on a slippery path (b) a tyre with deep treads (c) a grippy rubber sole (d) a wheel on ball bearings
33. 33.⚖️ Along a straight bar, measured from the left end, the effort is at 70 cm, the fulcrum at 30 cm and the load at 20 cm. Which class of lever is it? (a) class 3 (b) class 1 (c) class 2
34. 34.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 6 N, a glass sheet 3 N, a wooden plank 4 N, a carpet 5 N. Which surface gave the most friction? (a) a wooden plank (b) a carpet (c) sandpaper (d) a glass sheet
35. 35.⚖️ Along a straight bar, measured from the left end, the effort is at 30 cm, the fulcrum at 60 cm and the load at 10 cm. Which class of lever is it? (a) class 1 (b) class 3 (c) class 2
36. 36.⚙️ Which simple machine is a screw jack? (a) screw (b) inclined plane (c) wedge (d) wheel and axle
37. 37.True or false: a seesaw is a class 1 lever (fulcrum in the middle). (a) True (b) False
38. 38.⚖️ Which class of lever is a nutcracker? (a) class 3 (b) class 1 (c) class 2
39. 39.⚖️ A seesaw balances. Arjun (? N) sits 3 m from the pivot on one side; Zoya (540 N) sits 3 m from the pivot on the other side. What is the missing weight in newtons?
40. 40.🪝 A load of 180 N hangs from a pulley system in which 2 rope sections hold up the load. What effort is needed, in newtons? (ideal pulleys)

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