Engineering Worksheet: Part 2 Test

Engineering lesson 16: Part 2 test: forces and machines · Set 367 · 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.🛞 How can we reduce friction in a machine? (a) press parts harder (b) make parts rough (c) oil the moving parts (d) add sand
2. 2.🛞 More or less friction: a rough doormat? (a) more friction (b) less friction
3. 3.🛞 More or less friction: a smooth steel slide? (a) more friction (b) less friction
4. 4.🏋️ A force of 170 N pushes a cart 3 m along the floor. How much work is done, in joules?
5. 5.🪝 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)
6. 6.🔍 Which is the odd one out? (a) a wheel on ball bearings (b) oil on a squeaky hinge (c) skating on ice (d) a grippy rubber sole
7. 7.⚙️ A screw is really … (a) a ramp wrapped round (b) a bent lever (c) a kind of wheel (d) a tiny pulley
8. 8.True or false: a wet tiled floor gives less friction. (a) False (b) True
9. 9.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 8 N, sandpaper 9 N, a glass sheet 1 N, a wooden plank 5 N. How many newtons more were needed on sandpaper than on a glass sheet?
10. 10.⚖️ Turning effect = force × … (a) colour of bar (b) time taken (c) mass of fulcrum (d) distance from fulcrum
11. 11.💪 A box weighs 460 N. Taking 1 kg to weigh about 10 N, what is its mass in kilograms?
12. 12.🪝 A well winch has a handle (wheel) of radius 16 cm turning an axle of radius 4 cm. What is its mechanical advantage (MA)?
13. 13.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 7 N, a carpet 9 N, sandpaper 11 N, a glass sheet 4 N. How many newtons more were needed on sandpaper than on a glass sheet?
14. 14.🪝 Fixed or movable pulley: which one only changes direction? (a) a fixed pulley (b) a movable pulley
15. 15.🪝 A bucket weighing 470 N is lifted with a single fixed pulley at the top of a well. What effort is needed, in newtons? (ideal pulley, no friction)
16. 16.⚖️ Going along a lever from one end to the other, the order is: effort, fulcrum, load. Which class of lever is it? (a) class 2 (b) class 1 (c) class 3
17. 17.⚖️ A seesaw balances. Arjun (? N) sits 2 m from the pivot on one side; Ravi (260 N) sits 1 m from the pivot on the other side. What is the missing weight in newtons?
18. 18.🏋️ Pushing a crate 10 m took 4400 J of work. What force was used, in newtons?
19. 19.💪 Which force is at work: an apple falls down? (a) gravity (b) magnetic force (c) muscular force (d) friction
20. 20.⚖️ A lever bar balances. The load is 250 N at ? cm from the fulcrum. The effort is 200 N at 50 cm from the fulcrum on the other side. What is the missing distance in centimetres?
21. 21.True or false: pulling up your socks is a pull. (a) False (b) True
22. 22.🏋️ A force of 10 N did 70 J of work. How many metres did the object move?
23. 23.True or false: a fixed pulley hangs on the rope loop. (a) True (b) False
24. 24.⚖️ Which class of lever is a beam balance? (a) class 3 (b) class 2 (c) class 1
25. 25.🏋️ A smooth ramp is 6 m long and rises 2 m. What effort pushes a 2700 N box up it, in newtons? (ideal ramp, no friction)
26. 26.🪝 A pulley system has 4 rope sections holding up the load. To lift the load by 7 m, how many metres of rope must you pull?
27. 27.🪝 A winch has a wheel of radius 18 cm and an axle of radius 3 cm. What effort on the wheel lifts a 1200 N bucket on the axle, in newtons? (ideal)
28. 28.💪 Is closing a drawer a push or a pull? (a) a pull (b) a push
29. 29.🛞 Is friction helpful or a problem here: writing with a pencil? (a) a problem (b) helpful
30. 30.🏋️ Pushing a crate 9 m took 90 J of work. What force was used, in newtons?
31. 31.⚖️ A lever bar balances. The load is 90 N at 50 cm from the fulcrum. The effort is ? N at 30 cm from the fulcrum on the other side. What is the missing force in newtons?
32. 32.⚖️ Which class of lever is a pair of kitchen tongs? (a) class 3 (b) class 2 (c) class 1
33. 33.True or false: a nutcracker is a class 1 lever (fulcrum in the middle). (a) True (b) False
34. 34.True or false: skating on ice gives more friction. (a) True (b) False
35. 35.⚖️ Along a straight bar, measured from the left end, the effort is at 20 cm, the fulcrum at 10 cm and the load at 60 cm. Which class of lever is it? (a) class 2 (b) class 1 (c) class 3
36. 36.⚖️ A seesaw balances. Ravi (? N) sits 4 m from the pivot on one side; Asha (560 N) sits 3 m from the pivot on the other side. What is the missing weight in newtons?
37. 37.True or false: a wood screw is a pulley. (a) True (b) False
38. 38.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 1 N, a glass sheet 3 N, a wooden plank 7 N, sandpaper 8 N. How many newtons more were needed on sandpaper than on ice?
39. 39.🔍 Which is the odd one out? (a) oil on a squeaky hinge (b) a grippy rubber sole (c) a tyre with deep treads (d) a rough doormat
40. 40.🏋️ Pushing a crate 2 m took 260 J of work. What force was used, in newtons?

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