Engineering Worksheet: Part 2 Test

Engineering lesson 16: Part 2 test: forces and machines · Set 249 · 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.🏋️ Work is done when a force moves something … (a) through a distance (b) without moving it (c) very slowly (d) only upwards
2. 2.🪝 A bucket weighing 400 N is lifted with a single fixed pulley at the top of a well. What effort is needed, in newtons? (ideal pulley, no friction)
3. 3.True or false: a bottle cap is a screw. (a) True (b) False
4. 4.🪝 A load of 330 N hangs from a pulley system in which 3 rope sections hold up the load. What effort is needed, in newtons? (ideal pulleys)
5. 5.True or false: a knife edge is a wedge. (a) True (b) False
6. 6.🛞 More or less friction: oil on a squeaky hinge? (a) less friction (b) more friction
7. 7.True or false: a wet tiled floor gives less friction. (a) True (b) False
8. 8.⚖️ Going along a lever from one end to the other, the order is: effort, fulcrum, load. Which class of lever is it? (a) class 3 (b) class 1 (c) class 2
9. 9.⚖️ A lever bar balances. The load is ? N at 40 cm from the fulcrum. The effort is 80 N at 20 cm from the fulcrum on the other side. What is the missing force in newtons?
10. 10.🏋️ Pushing a crate 3 m took 1320 J of work. What force was used, in newtons?
11. 11.True or false: a crane hook block is a pulley. (a) True (b) False
12. 12.True or false: pulling up your socks is a pull. (a) True (b) False
13. 13.💪 Is pressing a doorbell a push or a pull? (a) a push (b) a pull
14. 14.💪 Two equal forces push on a box from opposite sides. They are … (a) unbalanced (b) gravity (c) balanced (d) doubled
15. 15.🪝 Fixed or movable pulley: which one is on a flagpole top? (a) a fixed pulley (b) a movable pulley
16. 16.True or false: a fishing rod is a class 3 lever (effort in the middle). (a) True (b) False
17. 17.💪 Is hitting a cricket ball a push or a pull? (a) a pull (b) a push
18. 18.💪 Which force is at work: shoes grip the floor? (a) friction (b) magnetic force (c) gravity (d) muscular force
19. 19.🪝 A winch has a wheel of radius 8 cm and an axle of radius 2 cm. What effort on the wheel lifts a 400 N bucket on the axle, in newtons? (ideal)
20. 20.🪝 A load of 840 N hangs from a pulley system in which 3 rope sections hold up the load. What effort is needed, in newtons? (ideal pulleys)
21. 21.🛞 More or less friction: a rough doormat? (a) more friction (b) less friction
22. 22.⚖️ A lever bar balances. The load is 300 N at ? cm from the fulcrum. The effort is 300 N at 50 cm from the fulcrum on the other side. What is the missing distance in centimetres?
23. 23.True or false: a lemon squeezer is a class 3 lever (effort in the middle). (a) True (b) False
24. 24.🏋️ A force of 80 N pushes a cart 5 m along the floor. How much work is done, in joules?
25. 25.🪝 A pulley system lifts a 450 N load with an effort of 150 N. What is its mechanical advantage (MA)?
26. 26.🔍 Which is the odd one out? (a) a water tap handle (b) a well-bucket rope wheel (c) a window blind cord (d) a crane hook block
27. 27.Which of these is a pulley? (a) a playground slide (b) a road up a hill (c) a window blind cord (d) a crowbar
28. 28.🏋️ In which unit is work measured? (a) metre (m) (b) watt hour (c) joule (J) (d) newton (N)
29. 29.⚖️ Which class of lever is a pair of tweezers? (a) class 2 (b) class 1 (c) class 3
30. 30.⚖️ In a class 2 lever, what is in the middle? (a) the effort (b) the axle (c) the fulcrum (d) the load
31. 31.🪝 What does a single fixed pulley change? (a) the colour of rope (b) the direction of pull (c) gravity (d) the size of the load
32. 32.🪝 A well winch has a handle (wheel) of radius 6 cm turning an axle of radius 3 cm. What is its mechanical advantage (MA)?
33. 33.🛞 How can we reduce friction in a machine? (a) press parts harder (b) make parts rough (c) add sand (d) oil the moving parts
34. 34.⚖️ A lever balances when … (a) turning effects match (b) both weights are equal (c) the fulcrum moves (d) the bar is short
35. 35.🪝 Fixed or movable pulley: which one needs effort = load? (a) a movable pulley (b) a fixed pulley
36. 36.🪝 A pulley system lifts a 280 N load with an effort of 70 N. What is its mechanical advantage (MA)?
37. 37.True or false: a wheelbarrow is a class 2 lever (load in the middle). (a) False (b) True
38. 38.💪 Is a tug of war a push or a pull? (a) a push (b) a pull
39. 39.⚖️ A lever bar balances. The load is 630 N at 30 cm from the fulcrum. The effort is ? N at 90 cm from the fulcrum on the other side. What is the missing force in newtons?
40. 40.💪 A force is a … (a) push or a pull (b) kind of colour (c) unit of time (d) type of sound

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