Engineering Worksheet: Part 2 Test

Engineering lesson 16: Part 2 test: forces and machines · Set 779 · 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.True or false: a bottle opener is a class 2 lever (load in the middle). (a) True (b) False
2. 2.⚖️ Which class of lever is a fishing rod? (a) class 2 (b) class 3 (c) class 1
3. 3.💪 A bag has a mass of 16 kg. Taking 1 kg to weigh about 10 N, what is its weight in newtons?
4. 4.⚖️ On a seesaw, a heavier child should sit … (a) farther from the pivot (b) on the pivot (c) closer to the pivot (d) anywhere
5. 5.⚖️ A lever bar balances. The load is 40 N at 40 cm from the fulcrum. The effort is ? N at 20 cm from the fulcrum on the other side. What is the missing force in newtons?
6. 6.🛞 More or less friction: a wet tiled floor? (a) more friction (b) less friction
7. 7.🏋️ An 18 kg box is lifted straight up by 5 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
8. 8.🏋️ An 11 kg box is lifted straight up by 4 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
9. 9.⚖️ Along a straight bar, measured from the left end, the effort is at 60 cm, the fulcrum at 20 cm and the load at 0 cm. Which class of lever is it? (a) class 1 (b) class 2 (c) class 3
10. 10.Which of these is a lever? (a) a door stopper (b) a window blind cord (c) a jar lid (d) a bottle opener
11. 11.🪝 A load of 160 N hangs from a pulley system in which 2 rope sections hold up the load. What effort is needed, in newtons? (ideal pulleys)
12. 12.💪 Which force is at work: a compass needle turns? (a) gravity (b) friction (c) magnetic force (d) muscular force
13. 13.🛞 Is friction helpful or a problem here: writing with a pencil? (a) a problem (b) helpful
14. 14.⚖️ A lever balances when … (a) both weights are equal (b) the fulcrum moves (c) the bar is short (d) turning effects match
15. 15.Which of these is a wedge? (a) a truck loading ramp (b) a flagpole rope wheel (c) a chisel (d) a jar lid
16. 16.⚖️ Going along a lever from one end to the other, the order is: effort, load, fulcrum. Which class of lever is it? (a) class 3 (b) class 2 (c) class 1
17. 17.True or false: pulling up your socks is a push. (a) True (b) False
18. 18.⚖️ Turning effect = force × … (a) distance from fulcrum (b) time taken (c) colour of bar (d) mass of fulcrum
19. 19.⚙️ Most simple machines make work easier by letting us … (a) use a smaller force (b) make new energy (c) switch off gravity (d) stop all friction
20. 20.⚖️ Which class of lever is a broom when sweeping? (a) class 1 (b) class 3 (c) class 2
21. 21.🏋️ A smooth ramp is 6 m long and rises 1 m. What effort pushes a 3300 N box up it, in newtons? (ideal ramp, no friction)
22. 22.🏋️ A smooth ramp is 2 m long and rises 1 m. What effort pushes a 1500 N box up it, in newtons? (ideal ramp, no friction)
23. 23.True or false: a tug of war is a pull. (a) True (b) False
24. 24.True or false: a pair of scissors is a class 2 lever (load in the middle). (a) True (b) False
25. 25.True or false: a pair of kitchen tongs is a class 1 lever (fulcrum in the middle). (a) True (b) False
26. 26.⚖️ To lift a heavy rock with a crowbar more easily, push … (a) far from the fulcrum (b) near the fulcrum (c) on the fulcrum (d) on the rock
27. 27.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 3 N, a glass sheet 4 N, a carpet 7 N, sandpaper 8 N. Which surface gave the most friction? (a) sandpaper (b) a carpet (c) ice (d) a glass sheet
28. 28.🪝 Fixed or movable pulley: which one hangs on the rope loop? (a) a fixed pulley (b) a movable pulley
29. 29.🛞 Is friction helpful or a problem here: gripping a cricket bat? (a) a problem (b) helpful
30. 30.🏋️ Mechanical advantage (MA) = … (a) load ÷ effort (b) load × effort (c) effort ÷ load (d) load + effort
31. 31.💪 Which force is at work: a river flows downhill? (a) gravity (b) magnetic force (c) friction (d) muscular force
32. 32.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 9 N, sandpaper 10 N, ice 4 N, a glass sheet 7 N. How many newtons more were needed on sandpaper than on ice?
33. 33.🛞 More or less friction: skating on ice? (a) more friction (b) less friction
34. 34.True or false: a well-bucket rope wheel is a screw. (a) True (b) False
35. 35.🏋️ Work is done when a force moves something … (a) very slowly (b) without moving it (c) through a distance (d) only upwards
36. 36.Which of these is a lever? (a) a nutcracker (b) a nut and bolt (c) a round doorknob (d) the tip of a nail
37. 37.🏋️ A smooth ramp is 9 m long and rises 3 m. What effort pushes a 750 N box up it, in newtons? (ideal ramp, no friction)
38. 38.🪝 Fixed or movable pulley: which one only changes direction? (a) a movable pulley (b) a fixed pulley
39. 39.⚖️ A lever bar balances. The load is 210 N at ? cm from the fulcrum. The effort is 70 N at 30 cm from the fulcrum on the other side. What is the missing distance in centimetres?
40. 40.Which of these is caused by muscular force? (a) a magnet picks up pins (b) brakes stop a bicycle (c) lifting a school bag (d) rubbing hands warms them

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