Engineering Worksheet: Part 2 Test

Engineering lesson 16: Part 2 test: forces and machines · Set 625 · 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.⚖️ Going along a lever from one end to the other, the order is: load, fulcrum, effort. Which class of lever is it? (a) class 3 (b) class 1 (c) class 2
2. 2.🏋️ A smooth ramp is 6 m long and rises 1 m. What effort pushes a 2400 N box up it, in newtons? (ideal ramp, no friction)
3. 3.⚖️ Along a straight bar, measured from the left end, the effort is at 50 cm, the fulcrum at 0 cm and the load at 20 cm. Which class of lever is it? (a) class 1 (b) class 2 (c) class 3
4. 4.🪝 A bucket weighing 460 N is lifted with a single fixed pulley at the top of a well. What effort is needed, in newtons? (ideal pulley, no friction)
5. 5.💪 In which unit do we measure force? (a) metre (m) (b) litre (L) (c) newton (N) (d) second (s)
6. 6.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 5 N, a wooden plank 9 N, sandpaper 10 N, ice 2 N. Which surface gave the most friction? (a) a glass sheet (b) sandpaper (c) a wooden plank (d) ice
7. 7.🛞 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, ice 2 N, a glass sheet 5 N. How many newtons more were needed on a carpet than on ice?
8. 8.⚖️ Which class of lever is a pair of tweezers? (a) class 1 (b) class 2 (c) class 3
9. 9.💪 Is pushing a swing a push or a pull? (a) a push (b) a pull
10. 10.⚖️ Which class of lever is a pair of scissors? (a) class 1 (b) class 2 (c) class 3
11. 11.🏋️ A force of 340 N pushes a cart 2 m along the floor. How much work is done, in joules?
12. 12.💪 Which force pulls everything towards the Earth? (a) gravity (b) magnetism (c) wind (d) friction
13. 13.⚖️ A lever bar balances. The load is 90 N at ? cm from the fulcrum. The effort is 10 N at 90 cm from the fulcrum on the other side. What is the missing distance in centimetres?
14. 14.⚖️ A lever bar balances. The load is 600 N at 40 cm from the fulcrum. The effort is 240 N at ? cm from the fulcrum on the other side. What is the missing distance in centimetres?
15. 15.⚖️ A seesaw balances. Asha (280 N) sits ? m from the pivot on one side; Ravi (140 N) sits 2 m from the pivot on the other side. What is the missing distance in metres?
16. 16.True or false: a steering wheel is an inclined plane. (a) False (b) True
17. 17.🏋️ A machine lifts a load of 780 N when you push with 130 N. What is its mechanical advantage (MA)?
18. 18.🛞 How can we reduce friction in a machine? (a) press parts harder (b) add sand (c) make parts rough (d) oil the moving parts
19. 19.🏋️ Can a simple machine reduce the work done? (a) yes, always (b) no, work stays the same (c) yes, by half (d) only on Mondays
20. 20.True or false: a tug of war is a push. (a) False (b) True
21. 21.🏋️ In which unit is work measured? (a) metre (m) (b) newton (N) (c) joule (J) (d) watt hour
22. 22.🪝 A load of 240 N hangs from a pulley system in which 2 rope sections hold up the load. What effort is needed, in newtons? (ideal pulleys)
23. 23.🏋️ A force of 360 N pushes a cart 9 m along the floor. How much work is done, in joules?
24. 24.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 7 N, sandpaper 9 N, ice 2 N, a wooden plank 4 N. Which surface gave the least friction? (a) ice (b) sandpaper (c) a wooden plank (d) a carpet
25. 25.🪝 A pulley system lifts a 520 N load with an effort of 260 N. What is its mechanical advantage (MA)?
26. 26.True or false: drawing up a well bucket is a push. (a) True (b) False
27. 27.🔍 Which is the odd one out? (a) a box pushed on carpet (b) a smooth steel slide (c) a grippy rubber sole (d) a tyre with deep treads
28. 28.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 4 N, a wooden plank 5 N, a carpet 7 N, sandpaper 8 N. Which surface gave the least friction? (a) a wooden plank (b) sandpaper (c) a carpet (d) a glass sheet
29. 29.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 11 N, ice 4 N, a wooden plank 8 N, a carpet 10 N. How many newtons more were needed on sandpaper than on ice?
30. 30.🪝 Fixed or movable pulley: which one needs effort = load? (a) a movable pulley (b) a fixed pulley
31. 31.💪 Which force is at work: lifting a school bag? (a) friction (b) magnetic force (c) gravity (d) muscular force
32. 32.🪝 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?
33. 33.⚖️ A lever balances when … (a) turning effects match (b) the bar is short (c) the fulcrum moves (d) both weights are equal
34. 34.🛞 Friction acts … (a) only upwards (b) with the motion (c) only on ice (d) against the motion
35. 35.Which of these is caused by muscular force? (a) a rolling ball slows (b) shoes grip the floor (c) lifting a school bag (d) a fridge magnet sticks
36. 36.True or false: opening a drawer is a push. (a) False (b) True
37. 37.⚙️ A screw is really … (a) a bent lever (b) a ramp wrapped round (c) a tiny pulley (d) a kind of wheel
38. 38.⚖️ Which class of lever is a crowbar? (a) class 3 (b) class 2 (c) class 1
39. 39.True or false: hitting a cricket ball is a push. (a) True (b) False
40. 40.True or false: a movable pulley needs effort = load. (a) True (b) False

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