Engineering Worksheet: Part 2 Test

Engineering lesson 16: Part 2 test: forces and machines · Set 396 · 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.💪 In which unit do we measure force? (a) newton (N) (b) second (s) (c) metre (m) (d) litre (L)
2. 2.⚖️ Along a straight bar, measured from the left end, the effort is at 0 cm, the fulcrum at 20 cm and the load at 50 cm. Which class of lever is it? (a) class 1 (b) class 2 (c) class 3
3. 3.🪝 Fixed or movable pulley: which one stays in one place? (a) a movable pulley (b) a fixed pulley
4. 4.🪝 Fixed or movable pulley: which one makes you pull 2× rope? (a) a movable pulley (b) a fixed pulley
5. 5.🏋️ Work is done when a force moves something … (a) without moving it (b) very slowly (c) through a distance (d) only upwards
6. 6.⚖️ Turning effect = force × … (a) distance from fulcrum (b) time taken (c) mass of fulcrum (d) colour of bar
7. 7.🪝 A pulley system lifts a 360 N load with an effort of 120 N. What is its mechanical advantage (MA)?
8. 8.True or false: a movable pulley stays in one place. (a) True (b) False
9. 9.True or false: closing a drawer is a pull. (a) False (b) True
10. 10.⚖️ Along a straight bar, measured from the left end, the effort is at 50 cm, the fulcrum at 70 cm and the load at 10 cm. Which class of lever is it? (a) class 1 (b) class 2 (c) class 3
11. 11.🏋️ A force of 340 N did 3060 J of work. How many metres did the object move?
12. 12.⚙️ A screw is really … (a) a tiny pulley (b) a kind of wheel (c) a bent lever (d) a ramp wrapped round
13. 13.⚙️ Which simple machine is a wood screw? (a) lever (b) screw (c) wheel and axle (d) wedge
14. 14.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 5 N, a carpet 8 N, ice 3 N, a glass sheet 4 N. Which surface gave the least friction? (a) a wooden plank (b) a glass sheet (c) a carpet (d) ice
15. 15.True or false: your forearm is a class 1 lever (fulcrum in the middle). (a) True (b) False
16. 16.⚖️ A seesaw balances. Ravi (570 N) sits 3 m from the pivot on one side; Arjun (570 N) sits ? m from the pivot on the other side. What is the missing distance in metres?
17. 17.🏋️ A force of 20 N did 160 J of work. How many metres did the object move?
18. 18.True or false: a seesaw is a class 1 lever (fulcrum in the middle). (a) True (b) False
19. 19.💪 Which can a force NOT do? (a) change its shape (b) stop it moving (c) start it moving (d) change its colour
20. 20.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 3 N, a carpet 7 N, sandpaper 9 N, a glass sheet 1 N. How many newtons more were needed on sandpaper than on a glass sheet?
21. 21.🪝 A load of 760 N hangs from a pulley system in which 4 rope sections hold up the load. What effort is needed, in newtons? (ideal pulleys)
22. 22.True or false: a beam balance is a class 1 lever (fulcrum in the middle). (a) False (b) True
23. 23.⚖️ A lever balances when … (a) the bar is short (b) both weights are equal (c) turning effects match (d) the fulcrum moves
24. 24.True or false: a grippy rubber sole gives more friction. (a) False (b) True
25. 25.🪝 Fixed or movable pulley: which one is on a flagpole top? (a) a fixed pulley (b) a movable pulley
26. 26.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 8 N, sandpaper 10 N, ice 4 N, a wooden plank 7 N. Which surface gave the least friction? (a) sandpaper (b) a carpet (c) ice (d) a wooden plank
27. 27.💪 Is closing a drawer a push or a pull? (a) a pull (b) a push
28. 28.True or false: a box pushed on carpet gives more friction. (a) False (b) True
29. 29.💪 Is opening a drawer a push or a pull? (a) a push (b) a pull
30. 30.🪝 Fixed or movable pulley: which one needs effort = load? (a) a movable pulley (b) a fixed pulley
31. 31.🏋️ A force of 390 N pushes a cart 10 m along the floor. How much work is done, in joules?
32. 32.🪝 A pulley system lifts a 560 N load with an effort of 140 N. What is its mechanical advantage (MA)?
33. 33.True or false: a box pushed on carpet gives less friction. (a) False (b) True
34. 34.🔍 Which is the odd one out? (a) a wood screw (b) a jar lid (c) the tip of a nail (d) a nut and bolt
35. 35.Which of these is a wheel and axle? (a) a seesaw (b) a crowbar (c) a round doorknob (d) a wheelchair ramp
36. 36.⚖️ A lever bar balances. The load is 400 N at 10 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?
37. 37.🪝 Fixed or movable pulley: which one only changes direction? (a) a movable pulley (b) a fixed pulley
38. 38.⚖️ Going along a lever from one end to the other, the order is: effort, fulcrum, load. Which class of lever is it? (a) class 3 (b) class 2 (c) class 1
39. 39.🏋️ A 5 kg box is lifted straight up by 4 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
40. 40.⚖️ A lever bar balances. The load is 160 N at 20 cm from the fulcrum. The effort is 40 N at ? cm from the fulcrum on the other side. What is the missing distance in centimetres?

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