Engineering Worksheet: Part 2 Test

Engineering lesson 16: Part 2 test: forces and machines · Set 709 · 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 force is at work: squeezing a lemon? (a) magnetic force (b) muscular force (c) friction (d) gravity
2. 2.⚖️ In a class 1 lever, what is in the middle? (a) the effort (b) nothing (c) the load (d) the fulcrum
3. 3.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 14 N, ice 4 N, a wooden plank 7 N, a carpet 11 N. Which surface gave the most friction? (a) a wooden plank (b) sandpaper (c) ice (d) a carpet
4. 4.🔍 Which is the odd one out? (a) sand on a slippery path (b) a smooth steel slide (c) a wheel on ball bearings (d) oil on a squeaky hinge
5. 5.⚖️ On a seesaw, a heavier child should sit … (a) anywhere (b) on the pivot (c) farther from the pivot (d) closer to the pivot
6. 6.🛞 More or less friction: sand on a slippery path? (a) more friction (b) less friction
7. 7.⚖️ A lever bar balances. The load is 320 N at 20 cm from the fulcrum. The effort is ? N at 80 cm from the fulcrum on the other side. What is the missing force in newtons?
8. 8.⚖️ Along a straight bar, measured from the left end, the effort is at 60 cm, the fulcrum at 30 cm and the load at 0 cm. Which class of lever is it? (a) class 1 (b) class 3 (c) class 2
9. 9.🛞 Rubbing your hands fast makes them … (a) wet (b) cold (c) warm (d) magnetic
10. 10.💪 Two children push a box to the right, one with 50 N and the other with 15 N. What is the net (total) force on the box, in newtons?
11. 11.🛞 Is friction helpful or a problem here: writing with a pencil? (a) a problem (b) helpful
12. 12.True or false: a crowbar is a class 1 lever (fulcrum in the middle). (a) False (b) True
13. 13.Which of these is caused by magnetic force? (a) shoes grip the floor (b) a compass needle turns (c) lifting a school bag (d) brakes stop a bicycle
14. 14.True or false: oil on a squeaky hinge gives more friction. (a) False (b) True
15. 15.🏋️ A force of 130 N did 130 J of work. How many metres did the object move?
16. 16.🏋️ A machine lifts a load of 300 N when you push with 150 N. What is its mechanical advantage (MA)?
17. 17.🪝 Fixed or movable pulley: which one only changes direction? (a) a fixed pulley (b) a movable pulley
18. 18.True or false: pulling up your socks is a push. (a) False (b) True
19. 19.⚖️ Along a straight bar, measured from the left end, the effort is at 70 cm, the fulcrum at 30 cm and the load at 50 cm. Which class of lever is it? (a) class 1 (b) class 3 (c) class 2
20. 20.⚖️ Along a straight bar, measured from the left end, the effort is at 20 cm, the fulcrum at 50 cm and the load at 40 cm. Which class of lever is it? (a) class 1 (b) class 2 (c) class 3
21. 21.🪝 Fixed or movable pulley: which one hangs on the rope loop? (a) a fixed pulley (b) a movable pulley
22. 22.💪 A bag has a mass of 8 kg. Taking 1 kg to weigh about 10 N, what is its weight in newtons?
23. 23.🪝 A winch has a wheel of radius 2 cm and an axle of radius 1 cm. What effort on the wheel lifts a 100 N bucket on the axle, in newtons? (ideal)
24. 24.🪝 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
25. 25.🏋️ A 2 kg box is lifted straight up by 4 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
26. 26.⚖️ Along a straight bar, measured from the left end, the effort is at 70 cm, the fulcrum at 30 cm and the load at 0 cm. Which class of lever is it? (a) class 2 (b) class 3 (c) class 1
27. 27.⚖️ Which class of lever is a pair of tweezers? (a) class 3 (b) class 2 (c) class 1
28. 28.True or false: a broom when sweeping is a class 1 lever (fulcrum in the middle). (a) True (b) False
29. 29.⚖️ Going along a lever from one end to the other, the order is: load, fulcrum, effort. Which class of lever is it? (a) class 1 (b) class 3 (c) class 2
30. 30.🏋️ Mechanical advantage (MA) = … (a) load ÷ effort (b) load × effort (c) effort ÷ load (d) load + effort
31. 31.True or false: a fixed pulley hangs on the rope loop. (a) False (b) True
32. 32.⚖️ What is the pivot point of a lever called? (a) the fulcrum (b) the axle (c) the load (d) the effort
33. 33.💪 Is opening a drawer a push or a pull? (a) a pull (b) a push
34. 34.⚙️ Most simple machines make work easier by letting us … (a) switch off gravity (b) make new energy (c) stop all friction (d) use a smaller force
35. 35.Which of these is an inclined plane? (a) a chisel (b) a road up a hill (c) the tip of a nail (d) a nutcracker
36. 36.🛞 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 6 N, sandpaper 9 N. Which surface gave the least friction? (a) a glass sheet (b) a carpet (c) sandpaper (d) a wooden plank
37. 37.🛞 Which surface gives the MOST friction to a sliding block? (a) sandpaper (b) ice (c) polished marble (d) glass
38. 38.🏋️ A 9 kg box is lifted straight up by 2 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
39. 39.⚖️ Going along a lever from one end to the other, the order is: load, effort, fulcrum. Which class of lever is it? (a) class 1 (b) class 3 (c) class 2
40. 40.💪 Which can a force NOT do? (a) start it moving (b) stop it moving (c) change its colour (d) change its shape

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