Engineering Worksheet: Part 2 Test

Engineering lesson 16: Part 2 test: forces and machines · Set 364 · 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.💪 Is pushing a trolley a push or a pull? (a) a pull (b) a push
2. 2.⚖️ To lift a heavy rock with a crowbar more easily, push … (a) on the fulcrum (b) on the rock (c) far from the fulcrum (d) near the fulcrum
3. 3.🪝 A winch has a wheel of radius 10 cm and an axle of radius 5 cm. What effort on the wheel lifts a 140 N bucket on the axle, in newtons? (ideal)
4. 4.🪝 A pulley system has 3 rope sections holding up the load. To lift the load by 7 m, how many metres of rope must you pull?
5. 5.🔍 Which is the odd one out? (a) a box pushed on carpet (b) a rough doormat (c) oil on a squeaky hinge (d) sand on a slippery path
6. 6.⚖️ A lever bar balances. The load is ? N at 20 cm from the fulcrum. The effort is 40 N at 40 cm from the fulcrum on the other side. What is the missing force in newtons?
7. 7.⚖️ In a class 1 lever, what is in the middle? (a) the effort (b) the load (c) nothing (d) the fulcrum
8. 8.True or false: a seesaw is a lever. (a) True (b) False
9. 9.⚖️ A seesaw balances. Ravi (? N) sits 3 m from the pivot on one side; Asha (450 N) sits 4 m from the pivot on the other side. What is the missing weight in newtons?
10. 10.True or false: a movable pulley only changes direction. (a) False (b) True
11. 11.⚖️ Which class of lever is a pair of tweezers? (a) class 1 (b) class 2 (c) class 3
12. 12.⚖️ A seesaw balances. Ravi (170 N) sits ? m from the pivot on one side; Kabir (340 N) sits 1 m from the pivot on the other side. What is the missing distance in metres?
13. 13.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 9 N, sandpaper 12 N, ice 3 N, a wooden plank 7 N. How many newtons more were needed on sandpaper than on ice?
14. 14.Which of these is caused by friction? (a) a fridge magnet sticks (b) a thrown ball comes down (c) a rolling ball slows (d) squeezing a lemon
15. 15.⚖️ Going along a lever from one end to the other, the order is: load, fulcrum, effort. Which class of lever is it? (a) class 2 (b) class 3 (c) class 1
16. 16.⚙️ Which simple machine is a chisel? (a) lever (b) screw (c) wedge (d) pulley
17. 17.⚖️ Along a straight bar, measured from the left end, the effort is at 40 cm, the fulcrum at 20 cm and the load at 80 cm. Which class of lever is it? (a) class 2 (b) class 3 (c) class 1
18. 18.True or false: a wood screw is a wheel and axle. (a) False (b) True
19. 19.⚖️ A lever bar balances. The load is 250 N at 50 cm from the fulcrum. The effort is ? N at 50 cm from the fulcrum on the other side. What is the missing force in newtons?
20. 20.🪝 A well winch has a handle (wheel) of radius 8 cm turning an axle of radius 4 cm. What is its mechanical advantage (MA)?
21. 21.⚖️ Going along a lever from one end to the other, the order is: fulcrum, load, effort. Which class of lever is it? (a) class 1 (b) class 2 (c) class 3
22. 22.🏋️ A longer ramp to the same height needs … (a) less effort (b) more effort (c) the same effort (d) no effort
23. 23.🏋️ Pushing a crate 10 m took 1600 J of work. What force was used, in newtons?
24. 24.🪝 Fixed or movable pulley: which one stays in one place? (a) a fixed pulley (b) a movable pulley
25. 25.True or false: pressing a doorbell is a pull. (a) True (b) False
26. 26.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 7 N, sandpaper 11 N, a glass sheet 2 N, a wooden plank 4 N. Which surface gave the most friction? (a) a wooden plank (b) a carpet (c) a glass sheet (d) sandpaper
27. 27.True or false: a wheel on ball bearings gives more friction. (a) True (b) False
28. 28.🏋️ A force of 220 N pushes a cart 4 m along the floor. How much work is done, in joules?
29. 29.⚖️ A lever balances when … (a) turning effects match (b) the bar is short (c) the fulcrum moves (d) both weights are equal
30. 30.⚖️ A lever bar balances. The load is ? N at 30 cm from the fulcrum. The effort is 150 N at 40 cm from the fulcrum on the other side. What is the missing force in newtons?
31. 31.True or false: a bottle opener is a class 3 lever (effort in the middle). (a) False (b) True
32. 32.⚖️ A lever bar balances. The load is 100 N at 20 cm from the fulcrum. The effort is ? N at 50 cm from the fulcrum on the other side. What is the missing force in newtons?
33. 33.⚙️ Which simple machine is a road up a hill? (a) pulley (b) screw (c) wheel and axle (d) inclined plane
34. 34.🪝 A well winch has a handle (wheel) of radius 20 cm turning an axle of radius 5 cm. What is its mechanical advantage (MA)?
35. 35.🛞 Is friction helpful or a problem here: striking a matchstick? (a) a problem (b) helpful
36. 36.Which of these is caused by muscular force? (a) a compass needle turns (b) pedalling a cycle (c) a river flows downhill (d) a thrown ball comes down
37. 37.💪 Is pulling up your socks a push or a pull? (a) a push (b) a pull
38. 38.🪝 Fixed or movable pulley: which one needs effort = load? (a) a movable pulley (b) a fixed pulley
39. 39.True or false: a movable pulley is on a flagpole top. (a) True (b) False
40. 40.🛞 Is friction helpful or a problem here: shoe soles wearing out? (a) a problem (b) helpful

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