Engineering Worksheet: Part 2 Test

Engineering lesson 16: Part 2 test: forces and machines · Set 384 · 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 bucket weighing 170 N is lifted with a single fixed pulley at the top of a well. What effort is needed, in newtons? (ideal pulley, no friction)
2. 2.🪝 A pulley system lifts a 380 N load with an effort of 190 N. What is its mechanical advantage (MA)?
3. 3.True or false: a fishing rod is a class 1 lever (fulcrum in the middle). (a) False (b) True
4. 4.💪 A box weighs 440 N. Taking 1 kg to weigh about 10 N, what is its mass in kilograms?
5. 5.Which of these is caused by muscular force? (a) a rolling ball slows (b) rain falls to the ground (c) squeezing a lemon (d) a magnet picks up pins
6. 6.⚖️ Going along a lever from one end to the other, the order is: effort, load, fulcrum. Which class of lever is it? (a) class 1 (b) class 2 (c) class 3
7. 7.🔍 Which is the odd one out? (a) a nut and bolt (b) a wood screw (c) a screw jack (d) a playground slide
8. 8.⚙️ Which simple machine is a well-bucket rope wheel? (a) lever (b) wheel and axle (c) pulley (d) screw
9. 9.⚖️ A seesaw balances. Asha (120 N) sits 2 m from the pivot on one side; Kabir (240 N) sits ? m from the pivot on the other side. What is the missing distance in metres?
10. 10.⚖️ Going along a lever from one end to the other, the order is: fulcrum, load, effort. Which class of lever is it? (a) class 3 (b) class 1 (c) class 2
11. 11.⚖️ Along a straight bar, measured from the left end, the effort is at 10 cm, the fulcrum at 60 cm and the load at 40 cm. Which class of lever is it? (a) class 2 (b) class 3 (c) class 1
12. 12.🪝 A load of 680 N hangs from a pulley system in which 4 rope sections hold up the load. What effort is needed, in newtons? (ideal pulleys)
13. 13.⚙️ Which simple machine is a nutcracker? (a) wheel and axle (b) pulley (c) lever (d) wedge
14. 14.True or false: a nutcracker is a lever. (a) True (b) False
15. 15.🏋️ Pushing a crate 6 m took 600 J of work. What force was used, in newtons?
16. 16.🔍 Which is the odd one out? (a) a box pushed on carpet (b) a grippy rubber sole (c) a rough doormat (d) skating on ice
17. 17.⚙️ A screw is really … (a) a ramp wrapped round (b) a kind of wheel (c) a tiny pulley (d) a bent lever
18. 18.⚖️ Along a straight bar, measured from the left end, the effort is at 0 cm, the fulcrum at 80 cm and the load at 40 cm. Which class of lever is it? (a) class 1 (b) class 2 (c) class 3
19. 19.🏋️ Work is done when a force moves something … (a) only upwards (b) very slowly (c) without moving it (d) through a distance
20. 20.⚖️ A lever bar balances. The load is 560 N at 10 cm from the fulcrum. The effort is 80 N at ? cm from the fulcrum on the other side. What is the missing distance in centimetres?
21. 21.🪝 Fixed or movable pulley: which one hangs on the rope loop? (a) a fixed pulley (b) a movable pulley
22. 22.🪝 Fixed or movable pulley: which one rises with the load? (a) a movable pulley (b) a fixed pulley
23. 23.True or false: a pair of tweezers is a class 3 lever (effort in the middle). (a) True (b) False
24. 24.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 10 N, ice 1 N, a wooden plank 3 N, a carpet 6 N. Which surface gave the most friction? (a) ice (b) sandpaper (c) a carpet (d) a wooden plank
25. 25.💪 Two children push a box to the right, one with 10 N and the other with 35 N. What is the net (total) force on the box, in newtons?
26. 26.⚖️ A lever balances when … (a) the fulcrum moves (b) both weights are equal (c) turning effects match (d) the bar is short
27. 27.True or false: a wheelbarrow is a class 1 lever (fulcrum in the middle). (a) True (b) False
28. 28.⚙️ Most simple machines make work easier by letting us … (a) make new energy (b) stop all friction (c) switch off gravity (d) use a smaller force
29. 29.🏋️ A force of 410 N did 2460 J of work. How many metres did the object move?
30. 30.🪝 Fixed or movable pulley: which one needs effort = load? (a) a movable pulley (b) a fixed pulley
31. 31.🏋️ A longer ramp to the same height needs … (a) more effort (b) the same effort (c) less effort (d) no effort
32. 32.True or false: a pair of scissors is a class 3 lever (effort in the middle). (a) False (b) True
33. 33.True or false: a crowbar is a pulley. (a) False (b) True
34. 34.🏋️ A force of 410 N pushes a cart 2 m along the floor. How much work is done, in joules?
35. 35.🔍 Which is the odd one out? (a) a box pushed on carpet (b) a wet tiled floor (c) powder on a carrom board (d) skating on ice
36. 36.🪝 A well winch has a handle (wheel) of radius 10 cm turning an axle of radius 5 cm. What is its mechanical advantage (MA)?
37. 37.True or false: powder on a carrom board gives more friction. (a) True (b) False
38. 38.🏋️ Pushing a crate 4 m took 1520 J of work. What force was used, in newtons?
39. 39.💪 Which can a force NOT do? (a) change its shape (b) change its colour (c) stop it moving (d) start it moving
40. 40.⚖️ Which class of lever is a pair of scissors? (a) class 1 (b) class 3 (c) class 2

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