Engineering Worksheet: Part 2 Test

Engineering lesson 16: Part 2 test: forces and machines · Set 29 · 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.🏋️ A 15 kg box is lifted straight up by 3 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
2. 2.⚙️ How many simple machines are there in the usual list? (a) 10 (b) 6 (c) 12 (d) 3
3. 3.True or false: chalk on a gym bar gives more friction. (a) True (b) False
4. 4.⚖️ A seesaw balances. Zoya (440 N) sits ? m from the pivot on one side; Kabir (220 N) sits 4 m from the pivot on the other side. What is the missing distance in metres?
5. 5.⚖️ A seesaw balances. Meena (300 N) sits 4 m from the pivot on one side; Zoya (? N) sits 2 m from the pivot on the other side. What is the missing weight in newtons?
6. 6.🏋️ Can a simple machine reduce the work done? (a) yes, always (b) no, work stays the same (c) only on Mondays (d) yes, by half
7. 7.Which of these is caused by gravity? (a) a fridge magnet sticks (b) brakes stop a bicycle (c) a thrown ball comes down (d) rubbing hands warms them
8. 8.🪝 A load of 480 N hangs from a pulley system in which 4 rope sections hold up the load. What effort is needed, in newtons? (ideal pulleys)
9. 9.🛞 Is friction helpful or a problem here: walking without slipping? (a) a problem (b) helpful
10. 10.🔍 Which is the odd one out? (a) a seesaw (b) a truck loading ramp (c) a crowbar (d) a claw hammer on a nail
11. 11.⚖️ 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 2 (c) class 3
12. 12.🛞 More or less friction: sand on a slippery path? (a) more friction (b) less friction
13. 13.True or false: a round doorknob is a pulley. (a) False (b) True
14. 14.🪝 More rope sections holding a load means … (a) more effort needed (b) no change (c) the load floats (d) less effort needed
15. 15.🏋️ A 20 kg box is lifted straight up by 2 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
16. 16.Which of these is caused by friction? (a) lifting a school bag (b) rain falls to the ground (c) a rolling ball slows (d) squeezing a lemon
17. 17.⚖️ A seesaw balances. Ravi (440 N) sits 3 m from the pivot on one side; Meena (? N) sits 4 m from the pivot on the other side. What is the missing weight in newtons?
18. 18.⚖️ A lever bar balances. The load is 600 N at 40 cm from the fulcrum. The effort is ? N at 100 cm from the fulcrum on the other side. What is the missing force in newtons?
19. 19.🪝 A pulley system has 1 rope section holding up the load. To lift the load by 9 m, how many metres of rope must you pull?
20. 20.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 4 N, a glass sheet 5 N, a carpet 9 N, sandpaper 10 N. How many newtons more were needed on sandpaper than on ice?
21. 21.⚖️ A lever bar balances. The load is 280 N at 10 cm from the fulcrum. The effort is 70 N at ? cm from the fulcrum on the other side. What is the missing distance in centimetres?
22. 22.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 7 N, a wooden plank 8 N, sandpaper 12 N, ice 4 N. Which surface gave the least friction? (a) sandpaper (b) ice (c) a wooden plank (d) a glass sheet
23. 23.💪 Which force is at work: brakes stop a bicycle? (a) magnetic force (b) gravity (c) muscular force (d) friction
24. 24.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 7 N, sandpaper 10 N, a glass sheet 2 N, a wooden plank 3 N. Which surface gave the most friction? (a) sandpaper (b) a carpet (c) a glass sheet (d) a wooden plank
25. 25.⚙️ A wedge is … (a) a rope on a wheel (b) a bar on a pivot (c) two ramps back to back (d) a wheel on a rod
26. 26.🪝 Fixed or movable pulley: which one only changes direction? (a) a fixed pulley (b) a movable pulley
27. 27.🏋️ Pushing a crate 4 m took 1760 J of work. What force was used, in newtons?
28. 28.⚖️ A lever bar balances. The load is 160 N at ? cm from the fulcrum. The effort is 80 N at 20 cm from the fulcrum on the other side. What is the missing distance in centimetres?
29. 29.⚖️ A seesaw balances. Zoya (570 N) sits ? m from the pivot on one side; Asha (190 N) sits 3 m from the pivot on the other side. What is the missing distance in metres?
30. 30.⚖️ Turning effect = force × … (a) time taken (b) colour of bar (c) mass of fulcrum (d) distance from fulcrum
31. 31.Which of these is caused by magnetic force? (a) an apple falls down (b) a river flows downhill (c) a magnet picks up pins (d) a thrown ball comes down
32. 32.Which of these is a screw? (a) a water tap handle (b) a jar lid (c) a playground slide (d) a window blind cord
33. 33.🛞 Rubbing your hands fast makes them … (a) cold (b) magnetic (c) warm (d) wet
34. 34.🪝 A well winch has a handle (wheel) of radius 6 cm turning an axle of radius 1 cm. What is its mechanical advantage (MA)?
35. 35.🏋️ In which unit is work measured? (a) newton (N) (b) metre (m) (c) joule (J) (d) watt hour
36. 36.🔍 Which is the odd one out? (a) a wet tiled floor (b) skating on ice (c) a rough doormat (d) a wheel on ball bearings
37. 37.⚖️ A lever bar balances. The load is 70 N at ? cm from the fulcrum. The effort is 20 N at 70 cm from the fulcrum on the other side. What is the missing distance in centimetres?
38. 38.⚙️ Most simple machines make work easier by letting us … (a) make new energy (b) switch off gravity (c) stop all friction (d) use a smaller force
39. 39.Which of these is caused by muscular force? (a) rubbing hands warms them (b) lifting a school bag (c) a compass needle turns (d) a thrown ball comes down
40. 40.True or false: a fixed pulley needs effort = load. (a) False (b) True

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