Engineering Worksheet: Part 2 Test

Engineering lesson 16: Part 2 test: forces and machines · Set 607 · 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 class of lever is a bottle opener? (a) class 1 (b) class 2 (c) class 3
2. 2.💪 A bag has a mass of 23 kg. Taking 1 kg to weigh about 10 N, what is its weight in newtons?
3. 3.🛞 Is friction helpful or a problem here: a knot holding a rope? (a) a problem (b) helpful
4. 4.⚖️ A seesaw balances. Arjun (? N) sits 3 m from the pivot on one side; Kabir (360 N) sits 3 m from the pivot on the other side. What is the missing weight in newtons?
5. 5.🪝 A winch has a wheel of radius 10 cm and an axle of radius 5 cm. What effort on the wheel lifts a 180 N bucket on the axle, in newtons? (ideal)
6. 6.🪝 More rope sections holding a load means … (a) less effort needed (b) no change (c) the load floats (d) more effort needed
7. 7.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 12 N, ice 4 N, a glass sheet 6 N, a wooden plank 8 N. Which surface gave the most friction? (a) a wooden plank (b) a glass sheet (c) ice (d) sandpaper
8. 8.🪝 A load of 1200 N hangs from a pulley system in which 4 rope sections hold up the load. What effort is needed, in newtons? (ideal pulleys)
9. 9.Which of these is caused by muscular force? (a) an apple falls down (b) squeezing a lemon (c) a compass needle turns (d) rain falls to the ground
10. 10.True or false: a fixed pulley only changes direction. (a) True (b) False
11. 11.🪝 A load of 660 N hangs from a pulley system in which 3 rope sections hold up the load. What effort is needed, in newtons? (ideal pulleys)
12. 12.Which of these is a lever? (a) a seesaw (b) a road up a hill (c) a flagpole rope wheel (d) the tip of a nail
13. 13.🪝 A load of 450 N hangs from a pulley system in which 3 rope sections hold up the load. What effort is needed, in newtons? (ideal pulleys)
14. 14.🏋️ A force of 130 N did 130 J of work. How many metres did the object move?
15. 15.🪝 Fixed or movable pulley: which one only changes direction? (a) a fixed pulley (b) a movable pulley
16. 16.⚖️ Along a straight bar, measured from the left end, the effort is at 0 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
17. 17.💪 Which force is at work: brakes stop a bicycle? (a) friction (b) magnetic force (c) gravity (d) muscular force
18. 18.⚖️ A lever bar balances. The load is 240 N at 40 cm from the fulcrum. The effort is ? N at 60 cm from the fulcrum on the other side. What is the missing force in newtons?
19. 19.🏋️ A force of 480 N pushes a cart 5 m along the floor. How much work is done, in joules?
20. 20.⚖️ A lever balances when … (a) both weights are equal (b) turning effects match (c) the bar is short (d) the fulcrum moves
21. 21.True or false: a bottle opener is a lever. (a) False (b) True
22. 22.💪 Is drawing up a well bucket a push or a pull? (a) a pull (b) a push
23. 23.🏋️ Pushing a crate 4 m took 160 J of work. What force was used, in newtons?
24. 24.🪝 A pulley system has 1 rope section holding up the load. To lift the load by 3 m, how many metres of rope must you pull?
25. 25.⚖️ A seesaw balances. Meena (680 N) sits ? m from the pivot on one side; Asha (170 N) sits 4 m from the pivot on the other side. What is the missing distance in metres?
26. 26.True or false: a box pushed on carpet gives more friction. (a) False (b) True
27. 27.🏋️ A smooth ramp is 5 m long and rises 1 m. What effort pushes a 1000 N box up it, in newtons? (ideal ramp, no friction)
28. 28.🛞 More or less friction: skating on ice? (a) less friction (b) more friction
29. 29.🏋️ In which unit is work measured? (a) metre (m) (b) watt hour (c) newton (N) (d) joule (J)
30. 30.🏋️ Mechanical advantage (MA) = … (a) load × effort (b) effort ÷ load (c) load ÷ effort (d) load + effort
31. 31.🏋️ A force of 170 N pushes a cart 1 m along the floor. How much work is done, in joules?
32. 32.🪝 A bucket weighing 490 N is lifted with a single fixed pulley at the top of a well. What effort is needed, in newtons? (ideal pulley, no friction)
33. 33.🛞 More or less friction: a tyre with deep treads? (a) less friction (b) more friction
34. 34.🏋️ A machine lifts a load of 800 N when you push with 160 N. What is its mechanical advantage (MA)?
35. 35.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 5 N, a carpet 6 N, ice 3 N, a glass sheet 4 N. How many newtons more were needed on a carpet than on ice?
36. 36.True or false: a fixed pulley stays in one place. (a) True (b) False
37. 37.True or false: opening a drawer is a pull. (a) False (b) True
38. 38.⚖️ Going along a lever from one end to the other, the order is: load, effort, fulcrum. Which class of lever is it? (a) class 2 (b) class 1 (c) class 3
39. 39.🏋️ An 18 kg box is lifted straight up by 4 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
40. 40.⚖️ In a class 3 lever, what is in the middle? (a) the fulcrum (b) the pulley (c) the load (d) the effort

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