Engineering Worksheet: Part 2 Test

Engineering lesson 16: Part 2 test: forces and machines · Set 198 · 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 can a force NOT do? (a) change its colour (b) stop it moving (c) start it moving (d) change its shape
2. 2.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 9 N, ice 3 N, a glass sheet 7 N, a wooden plank 8 N. Which surface gave the least friction? (a) a glass sheet (b) a carpet (c) a wooden plank (d) ice
3. 3.💪 Which force pulls everything towards the Earth? (a) magnetism (b) wind (c) gravity (d) friction
4. 4.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 7 N, sandpaper 9 N, ice 3 N, a glass sheet 5 N. Which surface gave the most friction? (a) a carpet (b) a glass sheet (c) ice (d) sandpaper
5. 5.🔍 Which is the odd one out? (a) a box pushed on carpet (b) a rough doormat (c) oil on a squeaky hinge (d) chalk on a gym bar
6. 6.⚙️ Which simple machine is a water tap handle? (a) lever (b) screw (c) wheel and axle (d) wedge
7. 7.🪝 A wheel and axle is a big wheel fixed to … (a) a flat ramp (b) a sharp wedge (c) a smaller rod (axle) (d) a loose rope
8. 8.⚖️ Turning effect = force × … (a) distance from fulcrum (b) time taken (c) mass of fulcrum (d) colour of bar
9. 9.🪝 A winch has a wheel of radius 4 cm and an axle of radius 2 cm. What effort on the wheel lifts a 320 N bucket on the axle, in newtons? (ideal)
10. 10.🏋️ In which unit is work measured? (a) newton (N) (b) joule (J) (c) metre (m) (d) watt hour
11. 11.🪝 Fixed or movable pulley: which one only changes direction? (a) a movable pulley (b) a fixed pulley
12. 12.💪 In a tug of war, one team pulls right with 30 N and the other pulls left with 10 N. What is the size of the net force, in newtons?
13. 13.🛞 Rubbing your hands fast makes them … (a) wet (b) magnetic (c) cold (d) warm
14. 14.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 3 N, a wooden plank 6 N, sandpaper 7 N, ice 2 N. Which surface gave the least friction? (a) ice (b) sandpaper (c) a wooden plank (d) a glass sheet
15. 15.True or false: a smooth steel slide gives more friction. (a) False (b) True
16. 16.🛞 Is friction helpful or a problem here: striking a matchstick? (a) a problem (b) helpful
17. 17.⚖️ A lever bar balances. The load is 280 N at ? cm from the fulcrum. The effort is 350 N at 40 cm from the fulcrum on the other side. What is the missing distance in centimetres?
18. 18.💪 Is pushing a trolley a push or a pull? (a) a pull (b) a push
19. 19.💪 A force is a … (a) kind of colour (b) unit of time (c) type of sound (d) push or a pull
20. 20.⚖️ Along a straight bar, measured from the left end, the effort is at 50 cm, the fulcrum at 30 cm and the load at 90 cm. Which class of lever is it? (a) class 2 (b) class 3 (c) class 1
21. 21.⚖️ Along a straight bar, measured from the left end, the effort is at 60 cm, the fulcrum at 10 cm and the load at 30 cm. Which class of lever is it? (a) class 1 (b) class 2 (c) class 3
22. 22.🔍 Which is the odd one out? (a) a water tap handle (b) a well winch handle (c) a round doorknob (d) a well-bucket rope wheel
23. 23.⚖️ A seesaw balances. Arjun (570 N) sits 1 m from the pivot on one side; Ravi (? N) sits 3 m from the pivot on the other side. What is the missing weight in newtons?
24. 24.🪝 A pulley system has 4 rope sections holding up the load. To lift the load by 10 m, how many metres of rope must you pull?
25. 25.⚖️ A lever bar balances. The load is 400 N at ? cm from the fulcrum. The effort is 200 N at 40 cm from the fulcrum on the other side. What is the missing distance in centimetres?
26. 26.🛞 Friction acts … (a) with the motion (b) only on ice (c) against the motion (d) only upwards
27. 27.Which of these is a pulley? (a) a window blind cord (b) a seesaw (c) a nutcracker (d) a wood screw
28. 28.🔍 Which is the odd one out? (a) an axe blade (b) the tip of a nail (c) a chisel (d) a crane hook block
29. 29.💪 Two equal forces push on a box from opposite sides. They are … (a) unbalanced (b) balanced (c) doubled (d) gravity
30. 30.🛞 More or less friction: a grippy rubber sole? (a) more friction (b) less friction
31. 31.🏋️ A force of 350 N pushes a cart 6 m along the floor. How much work is done, in joules?
32. 32.🔍 Which is the odd one out? (a) a jar lid (b) a bottle cap (c) a screw jack (d) a flagpole rope wheel
33. 33.💪 Which force is at work: shoes grip the floor? (a) friction (b) magnetic force (c) gravity (d) muscular force
34. 34.True or false: a jar lid is a screw. (a) True (b) False
35. 35.True or false: a bottle cap is a pulley. (a) False (b) True
36. 36.⚙️ Which simple machine is a window blind cord? (a) wheel and axle (b) lever (c) wedge (d) pulley
37. 37.True or false: a fixed pulley rises with the load. (a) True (b) False
38. 38.⚖️ 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
39. 39.🪝 A pulley system lifts a 900 N load with an effort of 300 N. What is its mechanical advantage (MA)?
40. 40.True or false: a fixed pulley only changes direction. (a) False (b) True

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