Engineering Worksheet: Part 2 Test

Engineering lesson 16: Part 2 test: forces and machines · Set 536 · 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.🏋️ A machine lifts a load of 150 N when you push with 50 N. What is its mechanical advantage (MA)?
2. 2.🛞 More or less friction: a wheel on ball bearings? (a) more friction (b) less friction
3. 3.True or false: sand on a slippery path gives more friction. (a) False (b) True
4. 4.🔍 Which is the odd one out? (a) a bottle opener (b) a knife edge (c) a claw hammer on a nail (d) a seesaw
5. 5.🔍 Which is the odd one out? (a) a wet tiled floor (b) a smooth steel slide (c) a wheel on ball bearings (d) a tyre with deep treads
6. 6.🪝 A bucket weighing 480 N is lifted with a single fixed pulley at the top of a well. What effort is needed, in newtons? (ideal pulley, no friction)
7. 7.True or false: a jar lid is a screw. (a) True (b) False
8. 8.🏋️ A 6 kg box is lifted straight up by 5 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
9. 9.💪 Which force is at work: a rolling ball slows? (a) gravity (b) magnetic force (c) friction (d) muscular force
10. 10.⚖️ In a class 1 lever, what is in the middle? (a) the effort (b) nothing (c) the load (d) the fulcrum
11. 11.Which of these is a lever? (a) a wood screw (b) a water tap handle (c) a seesaw (d) a round doorknob
12. 12.True or false: a fishing rod is a class 1 lever (fulcrum in the middle). (a) True (b) False
13. 13.⚖️ A seesaw balances. Zoya (280 N) sits 3 m from the pivot on one side; Meena (? N) sits 2 m from the pivot on the other side. What is the missing weight in newtons?
14. 14.⚖️ A seesaw balances. Ravi (? N) sits 1 m from the pivot on one side; Asha (200 N) sits 2 m from the pivot on the other side. What is the missing weight in newtons?
15. 15.True or false: a beam balance is a class 2 lever (load in the middle). (a) True (b) False
16. 16.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 4 N, a carpet 8 N, sandpaper 9 N, ice 1 N. Which surface gave the most friction? (a) a wooden plank (b) a carpet (c) ice (d) sandpaper
17. 17.🏋️ A force of 70 N did 350 J of work. How many metres did the object move?
18. 18.True or false: a seesaw is a class 3 lever (effort in the middle). (a) True (b) False
19. 19.⚖️ A lever bar balances. The load is 240 N at 50 cm from the fulcrum. The effort is ? N at 80 cm from the fulcrum on the other side. What is the missing force in newtons?
20. 20.🛞 Friction acts … (a) with the motion (b) only on ice (c) against the motion (d) only upwards
21. 21.True or false: a grippy rubber sole gives more friction. (a) False (b) True
22. 22.🔍 Which is the odd one out? (a) a rough doormat (b) a grippy rubber sole (c) powder on a carrom board (d) sand on a slippery path
23. 23.🏋️ Pushing a crate 2 m took 800 J of work. What force was used, in newtons?
24. 24.🛞 More or less friction: a grippy rubber sole? (a) more friction (b) less friction
25. 25.🔍 Which is the odd one out? (a) a window blind cord (b) a truck loading ramp (c) a wheelchair ramp (d) a road up a hill
26. 26.Which of these is an inclined plane? (a) a wheelchair ramp (b) a claw hammer on a nail (c) a steering wheel (d) a knife edge
27. 27.💪 Is kicking a football a push or a pull? (a) a push (b) a pull
28. 28.⚖️ A lever bar balances. The load is 300 N at ? cm from the fulcrum. The effort is 120 N at 50 cm from the fulcrum on the other side. What is the missing distance in centimetres?
29. 29.🪝 A winch has a wheel of radius 6 cm and an axle of radius 2 cm. What effort on the wheel lifts a 90 N bucket on the axle, in newtons? (ideal)
30. 30.🪝 Fixed or movable pulley: which one needs effort = load? (a) a movable pulley (b) a fixed pulley
31. 31.True or false: pulling up your socks is a pull. (a) False (b) True
32. 32.🪝 A well winch has a handle (wheel) of radius 8 cm turning an axle of radius 1 cm. What is its mechanical advantage (MA)?
33. 33.🔍 Which is the odd one out? (a) a rough doormat (b) a wheel on ball bearings (c) chalk on a gym bar (d) a box pushed on carpet
34. 34.🪝 A pulley system lifts a 120 N load with an effort of 30 N. What is its mechanical advantage (MA)?
35. 35.🛞 Rubbing your hands fast makes them … (a) warm (b) cold (c) magnetic (d) wet
36. 36.True or false: oil on a squeaky hinge gives less friction. (a) True (b) False
37. 37.🏋️ Pushing a crate 1 m took 210 J of work. What force was used, in newtons?
38. 38.🏋️ Can a simple machine reduce the work done? (a) yes, always (b) yes, by half (c) no, work stays the same (d) only on Mondays
39. 39.True or false: opening a drawer is a push. (a) False (b) True
40. 40.🏋️ Mechanical advantage (MA) = … (a) load × effort (b) load ÷ effort (c) load + effort (d) effort ÷ load

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