Engineering Worksheet: Part 2 Test

Engineering lesson 16: Part 2 test: forces and machines · Set 594 · 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.True or false: your forearm is a class 3 lever (effort in the middle). (a) True (b) False
2. 2.🪝 A bucket weighing 250 N is lifted with a single fixed pulley at the top of a well. What effort is needed, in newtons? (ideal pulley, no friction)
3. 3.🔍 Which is the odd one out? (a) a tyre with deep treads (b) a box pushed on carpet (c) chalk on a gym bar (d) a wet tiled floor
4. 4.True or false: a window blind cord is a wedge. (a) False (b) True
5. 5.🛞 More or less friction: a rough doormat? (a) more friction (b) less friction
6. 6.💪 A box weighs 490 N. Taking 1 kg to weigh about 10 N, what is its mass in kilograms?
7. 7.🪝 A pulley system lifts a 360 N load with an effort of 90 N. What is its mechanical advantage (MA)?
8. 8.🏋️ A force of 60 N did 480 J of work. How many metres did the object move?
9. 9.🛞 More or less friction: a wet tiled floor? (a) more friction (b) less friction
10. 10.True or false: sand on a slippery path gives more friction. (a) True (b) False
11. 11.🏋️ Pushing a crate 9 m took 3780 J of work. What force was used, in newtons?
12. 12.⚖️ Which class of lever is a bottle opener? (a) class 2 (b) class 1 (c) class 3
13. 13.True or false: hitting a cricket ball is a push. (a) True (b) False
14. 14.🏋️ Pushing a crate 4 m took 1280 J of work. What force was used, in newtons?
15. 15.💪 A bag has a mass of 50 kg. Taking 1 kg to weigh about 10 N, what is its weight in newtons?
16. 16.Which of these is caused by friction? (a) pedalling a cycle (b) lifting a school bag (c) rain falls to the ground (d) a rolling ball slows
17. 17.⚖️ Along a straight bar, measured from the left end, the effort is at 10 cm, the fulcrum at 40 cm and the load at 50 cm. Which class of lever is it? (a) class 2 (b) class 1 (c) class 3
18. 18.🛞 Is friction helpful or a problem here: writing with a pencil? (a) helpful (b) a problem
19. 19.⚖️ On a seesaw, a heavier child should sit … (a) anywhere (b) closer to the pivot (c) on the pivot (d) farther from the pivot
20. 20.🏋️ Pushing a crate 4 m took 1600 J of work. What force was used, in newtons?
21. 21.True or false: a fixed pulley rises with the load. (a) True (b) False
22. 22.🏋️ A longer ramp to the same height needs … (a) less effort (b) the same effort (c) more effort (d) no effort
23. 23.True or false: a pair of pliers is a class 1 lever (fulcrum in the middle). (a) False (b) True
24. 24.💪 A cart is pulled to the right with 30 N and to the left with 45 N. Which way does the net force act? (a) no net force (b) to the right (c) to the left
25. 25.🪝 A pulley system lifts a 180 N load with an effort of 90 N. What is its mechanical advantage (MA)?
26. 26.🏋️ A 20 kg box is lifted straight up by 3 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
27. 27.⚖️ A lever balances when … (a) turning effects match (b) the bar is short (c) the fulcrum moves (d) both weights are equal
28. 28.🪝 A load of 420 N hangs from a pulley system in which 3 rope sections hold up the load. What effort is needed, in newtons? (ideal pulleys)
29. 29.⚖️ A seesaw balances. Ravi (? N) sits 1 m from the pivot on one side; Kabir (120 N) sits 1 m from the pivot on the other side. What is the missing weight in newtons?
30. 30.⚖️ In a class 2 lever, what is in the middle? (a) the fulcrum (b) the load (c) the effort (d) the axle
31. 31.⚖️ Which class of lever is a pair of kitchen tongs? (a) class 3 (b) class 2 (c) class 1
32. 32.🛞 More or less friction: a grippy rubber sole? (a) less friction (b) more friction
33. 33.💪 Is opening a drawer a push or a pull? (a) a push (b) a pull
34. 34.True or false: hitting a cricket ball is a pull. (a) True (b) False
35. 35.True or false: pushing a trolley is a push. (a) True (b) False
36. 36.💪 A force is a … (a) kind of colour (b) type of sound (c) unit of time (d) push or a pull
37. 37.True or false: a crowbar is a class 2 lever (load in the middle). (a) False (b) True
38. 38.🏋️ A machine lifts a load of 480 N when you push with 160 N. What is its mechanical advantage (MA)?
39. 39.🏋️ A smooth ramp is 6 m long and rises 2 m. What effort pushes a 2100 N box up it, in newtons? (ideal ramp, no friction)
40. 40.⚖️ A lever bar balances. The load is ? N at 40 cm from the fulcrum. The effort is 80 N at 60 cm from the fulcrum on the other side. What is the missing force in newtons?

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