Engineering Worksheet: Part 2 Test

Engineering lesson 16: Part 2 test: forces and machines · Set 568 · 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.🔍 Which is the odd one out? (a) a nut and bolt (b) a bottle cap (c) a jar lid (d) a water tap handle
2. 2.⚖️ In a class 3 lever, what is in the middle? (a) the effort (b) the pulley (c) the load (d) the fulcrum
3. 3.⚖️ A lever bar balances. The load is ? N at 30 cm from the fulcrum. The effort is 30 N at 20 cm from the fulcrum on the other side. What is the missing force in newtons?
4. 4.Which of these is caused by muscular force? (a) rain falls to the ground (b) brakes stop a bicycle (c) squeezing a lemon (d) a fridge magnet sticks
5. 5.⚖️ Along a straight bar, measured from the left end, the effort is at 10 cm, the fulcrum at 50 cm and the load at 70 cm. Which class of lever is it? (a) class 2 (b) class 3 (c) class 1
6. 6.🪝 What does a single fixed pulley change? (a) the size of the load (b) the direction of pull (c) the colour of rope (d) gravity
7. 7.⚖️ Along a straight bar, measured from the left end, the effort is at 20 cm, the fulcrum at 90 cm and the load at 60 cm. Which class of lever is it? (a) class 3 (b) class 2 (c) class 1
8. 8.True or false: a pair of pliers is a class 1 lever (fulcrum in the middle). (a) True (b) False
9. 9.💪 Which force is at work: an apple falls down? (a) gravity (b) muscular force (c) magnetic force (d) friction
10. 10.⚖️ Which class of lever is a crowbar? (a) class 3 (b) class 1 (c) class 2
11. 11.💪 A box weighs 320 N. Taking 1 kg to weigh about 10 N, what is its mass in kilograms?
12. 12.⚖️ Turning effect = force × … (a) mass of fulcrum (b) distance from fulcrum (c) colour of bar (d) time taken
13. 13.🪝 A wheel and axle is a big wheel fixed to … (a) a sharp wedge (b) a smaller rod (axle) (c) a loose rope (d) a flat ramp
14. 14.True or false: a smooth steel slide gives more friction. (a) True (b) False
15. 15.🛞 Rubbing your hands fast makes them … (a) wet (b) cold (c) warm (d) magnetic
16. 16.🏋️ A force of 140 N did 1400 J of work. How many metres did the object move?
17. 17.⚖️ Along a straight bar, measured from the left end, the effort is at 20 cm, the fulcrum at 60 cm and the load at 30 cm. Which class of lever is it? (a) class 3 (b) class 1 (c) class 2
18. 18.💪 A bag has a mass of 27 kg. Taking 1 kg to weigh about 10 N, what is its weight in newtons?
19. 19.💪 Is closing a drawer a push or a pull? (a) a pull (b) a push
20. 20.💪 Is pushing a trolley a push or a pull? (a) a pull (b) a push
21. 21.Which of these is a screw? (a) a nut and bolt (b) a bottle opener (c) a door stopper (d) a nutcracker
22. 22.💪 In a tug of war, one team pulls right with 70 N and the other pulls left with 30 N. What is the size of the net force, in newtons?
23. 23.🪝 A well winch has a handle (wheel) of radius 20 cm turning an axle of radius 5 cm. What is its mechanical advantage (MA)?
24. 24.🏋️ An 8 kg box is lifted straight up by 4 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
25. 25.⚖️ A seesaw balances. Kabir (100 N) sits 3 m from the pivot on one side; Zoya (? N) sits 1 m from the pivot on the other side. What is the missing weight in newtons?
26. 26.⚖️ A lever bar balances. The load is 300 N at ? cm from the fulcrum. The effort is 240 N at 50 cm from the fulcrum on the other side. What is the missing distance in centimetres?
27. 27.🪝 A bucket weighing 440 N is lifted with a single fixed pulley at the top of a well. What effort is needed, in newtons? (ideal pulley, no friction)
28. 28.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 7 N, sandpaper 9 N, ice 2 N, a glass sheet 3 N. Which surface gave the most friction? (a) a glass sheet (b) sandpaper (c) ice (d) a wooden plank
29. 29.⚖️ A lever bar balances. The load is ? N at 20 cm from the fulcrum. The effort is 20 N at 70 cm from the fulcrum on the other side. What is the missing force in newtons?
30. 30.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 5 N, a carpet 7 N, sandpaper 9 N, a glass sheet 3 N. How many newtons more were needed on sandpaper than on a glass sheet?
31. 31.⚖️ Along a straight bar, measured from the left end, the effort is at 30 cm, the fulcrum at 90 cm and the load at 70 cm. Which class of lever is it? (a) class 2 (b) class 1 (c) class 3
32. 32.🏋️ A force of 450 N did 2700 J of work. How many metres did the object move?
33. 33.⚙️ Which simple machine is a crowbar? (a) pulley (b) wheel and axle (c) inclined plane (d) lever
34. 34.🔍 Which is the odd one out? (a) a tyre with deep treads (b) chalk on a gym bar (c) a wet tiled floor (d) a rough doormat
35. 35.💪 In a tug of war, one team pulls left with 30 N and the other pulls right with 15 N. What is the size of the net force, in newtons?
36. 36.💪 A force is a … (a) kind of colour (b) type of sound (c) unit of time (d) push or a pull
37. 37.💪 Which can a force NOT do? (a) start it moving (b) change its shape (c) stop it moving (d) change its colour
38. 38.⚖️ Which class of lever is your forearm? (a) class 2 (b) class 1 (c) class 3
39. 39.🪝 A load of 400 N hangs from a pulley system in which 4 rope sections hold up the load. What effort is needed, in newtons? (ideal pulleys)
40. 40.🛞 More or less friction: a grippy rubber sole? (a) more friction (b) less friction

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