Engineering Worksheet: Part 2 Test

Engineering lesson 16: Part 2 test: forces and machines · Set 464 · 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.⚖️ In a class 3 lever, what is in the middle? (a) the pulley (b) the fulcrum (c) the effort (d) the load
2. 2.⚖️ Which class of lever is a pair of pliers? (a) class 3 (b) class 2 (c) class 1
3. 3.🪝 A wheel and axle is a big wheel fixed to … (a) a loose rope (b) a flat ramp (c) a smaller rod (axle) (d) a sharp wedge
4. 4.🔍 Which is the odd one out? (a) a grippy rubber sole (b) chalk on a gym bar (c) a rough doormat (d) skating on ice
5. 5.⚙️ Which simple machine is a bottle opener? (a) wheel and axle (b) lever (c) pulley (d) wedge
6. 6.🏋️ An 11 kg box is lifted straight up by 2 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
7. 7.🏋️ A force of 450 N pushes a cart 6 m along the floor. How much work is done, in joules?
8. 8.🏋️ An 8 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.⚖️ A lever bar balances. The load is 630 N at 40 cm from the fulcrum. The effort is 280 N at ? cm from the fulcrum on the other side. What is the missing distance in centimetres?
10. 10.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 4 N, a carpet 7 N, sandpaper 10 N, a glass sheet 3 N. How many newtons more were needed on sandpaper than on a glass sheet?
11. 11.True or false: oil on a squeaky hinge gives less friction. (a) False (b) True
12. 12.⚖️ Which class of lever is your forearm? (a) class 1 (b) class 3 (c) class 2
13. 13.True or false: a wheelbarrow is a class 1 lever (fulcrum in the middle). (a) True (b) False
14. 14.⚙️ Which simple machine is a truck loading ramp? (a) inclined plane (b) wheel and axle (c) lever (d) wedge
15. 15.🪝 A well winch has a handle (wheel) of radius 16 cm turning an axle of radius 4 cm. What is its mechanical advantage (MA)?
16. 16.True or false: chalk on a gym bar gives more friction. (a) True (b) False
17. 17.🏋️ Mechanical advantage (MA) = … (a) load ÷ effort (b) effort ÷ load (c) load + effort (d) load × effort
18. 18.🔍 Which is the odd one out? (a) a nutcracker (b) a crane hook block (c) a bottle opener (d) a crowbar
19. 19.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 6 N, sandpaper 7 N, ice 1 N, a glass sheet 2 N. Which surface gave the least friction? (a) a glass sheet (b) ice (c) sandpaper (d) a wooden plank
20. 20.⚖️ Along a straight bar, measured from the left end, the effort is at 90 cm, the fulcrum at 60 cm and the load at 20 cm. Which class of lever is it? (a) class 2 (b) class 1 (c) class 3
21. 21.⚖️ Along a straight bar, measured from the left end, the effort is at 10 cm, the fulcrum at 0 cm and the load at 30 cm. Which class of lever is it? (a) class 1 (b) class 3 (c) class 2
22. 22.🪝 A bucket weighing 500 N is lifted with a single fixed pulley at the top of a well. What effort is needed, in newtons? (ideal pulley, no friction)
23. 23.🏋️ Work is done when a force moves something … (a) without moving it (b) only upwards (c) through a distance (d) very slowly
24. 24.🪝 A well winch has a handle (wheel) of radius 8 cm turning an axle of radius 2 cm. What is its mechanical advantage (MA)?
25. 25.🔍 Which is the odd one out? (a) a rough doormat (b) a wet tiled floor (c) a grippy rubber sole (d) chalk on a gym bar
26. 26.🏋️ In which unit is work measured? (a) watt hour (b) metre (m) (c) newton (N) (d) joule (J)
27. 27.💪 Is pressing a doorbell a push or a pull? (a) a push (b) a pull
28. 28.True or false: chalk on a gym bar gives less friction. (a) True (b) False
29. 29.💪 A box weighs 50 N. Taking 1 kg to weigh about 10 N, what is its mass in kilograms?
30. 30.💪 Is kicking a football a push or a pull? (a) a pull (b) a push
31. 31.⚖️ On a seesaw, a heavier child should sit … (a) anywhere (b) closer to the pivot (c) on the pivot (d) farther from the pivot
32. 32.⚖️ A lever bar balances. The load is 360 N at 30 cm from the fulcrum. The effort is 180 N at ? cm from the fulcrum on the other side. What is the missing distance in centimetres?
33. 33.⚖️ Which class of lever is a wheelbarrow? (a) class 1 (b) class 2 (c) class 3
34. 34.⚙️ Which simple machine is a flagpole rope wheel? (a) wedge (b) pulley (c) screw (d) wheel and axle
35. 35.⚙️ Which simple machine is a round doorknob? (a) wheel and axle (b) pulley (c) inclined plane (d) lever
36. 36.True or false: pressing a doorbell is a push. (a) False (b) True
37. 37.⚙️ How many simple machines are there in the usual list? (a) 10 (b) 12 (c) 6 (d) 3
38. 38.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 9 N, a carpet 11 N, ice 2 N, a glass sheet 5 N. How many newtons more were needed on a carpet than on ice?
39. 39.🛞 Rubbing your hands fast makes them … (a) cold (b) warm (c) magnetic (d) wet
40. 40.💪 Is drawing up a well bucket a push or a pull? (a) a pull (b) a push

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