Engineering Worksheet: Part 2 Test

Engineering lesson 16: Part 2 test: forces and machines · Set 541 · 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.🪝 Fixed or movable pulley: which one rises with the load? (a) a movable pulley (b) a fixed pulley
2. 2.⚖️ A lever bar balances. The load is 210 N at ? cm from the fulcrum. The effort is 90 N at 70 cm from the fulcrum on the other side. What is the missing distance in centimetres?
3. 3.⚖️ On a seesaw, a heavier child should sit … (a) on the pivot (b) anywhere (c) farther from the pivot (d) closer to the pivot
4. 4.🪝 A well winch has a handle (wheel) of radius 8 cm turning an axle of radius 1 cm. What is its mechanical advantage (MA)?
5. 5.🔍 Which is the odd one out? (a) a wet tiled floor (b) sand on a slippery path (c) a grippy rubber sole (d) a tyre with deep treads
6. 6.True or false: a pair of scissors is a class 2 lever (load in the middle). (a) False (b) True
7. 7.True or false: a fixed pulley stays in one place. (a) False (b) True
8. 8.🏋️ A machine lifts a load of 960 N when you push with 160 N. What is its mechanical advantage (MA)?
9. 9.🪝 A wheel and axle is a big wheel fixed to … (a) a flat ramp (b) a smaller rod (axle) (c) a loose rope (d) a sharp wedge
10. 10.⚙️ Most simple machines make work easier by letting us … (a) make new energy (b) use a smaller force (c) switch off gravity (d) stop all friction
11. 11.⚖️ A seesaw balances. Arjun (600 N) sits ? m from the pivot on one side; Asha (600 N) sits 3 m from the pivot on the other side. What is the missing distance in metres?
12. 12.True or false: a fixed pulley halves the effort. (a) False (b) True
13. 13.🪝 A bucket weighing 220 N is lifted with a single fixed pulley at the top of a well. What effort is needed, in newtons? (ideal pulley, no friction)
14. 14.⚖️ Along a straight bar, measured from the left end, the effort is at 20 cm, the fulcrum at 50 cm and the load at 10 cm. Which class of lever is it? (a) class 2 (b) class 1 (c) class 3
15. 15.🏋️ A force of 470 N pushes a cart 5 m along the floor. How much work is done, in joules?
16. 16.🏋️ In which unit is work measured? (a) watt hour (b) newton (N) (c) metre (m) (d) joule (J)
17. 17.🛞 More or less friction: a wheel on ball bearings? (a) less friction (b) more friction
18. 18.True or false: an axe blade is an inclined plane. (a) False (b) True
19. 19.🛞 More or less friction: oil on a squeaky hinge? (a) more friction (b) less friction
20. 20.💪 A cart is pulled to the right with 70 N and to the left with 55 N. Which way does the net force act? (a) to the left (b) no net force (c) to the right
21. 21.⚙️ How many simple machines are there in the usual list? (a) 3 (b) 10 (c) 12 (d) 6
22. 22.🏋️ A smooth ramp is 5 m long and rises 1 m. What effort pushes a 2750 N box up it, in newtons? (ideal ramp, no friction)
23. 23.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 5 N, sandpaper 6 N, ice 1 N, a glass sheet 4 N. How many newtons more were needed on sandpaper than on ice?
24. 24.🔍 Which is the odd one out? (a) skating on ice (b) a grippy rubber sole (c) a smooth steel slide (d) oil on a squeaky hinge
25. 25.💪 Which can a force NOT do? (a) change its shape (b) change its colour (c) start it moving (d) stop it moving
26. 26.⚖️ A seesaw balances. Asha (? N) sits 2 m from the pivot on one side; Arjun (240 N) sits 4 m from the pivot on the other side. What is the missing weight in newtons?
27. 27.True or false: kicking a football is a push. (a) False (b) True
28. 28.⚖️ In a class 3 lever, what is in the middle? (a) the effort (b) the pulley (c) the fulcrum (d) the load
29. 29.True or false: a beam balance is a class 1 lever (fulcrum in the middle). (a) False (b) True
30. 30.💪 A force is a … (a) kind of colour (b) type of sound (c) unit of time (d) push or a pull
31. 31.💪 Which force is at work: rain falls to the ground? (a) muscular force (b) magnetic force (c) gravity (d) friction
32. 32.True or false: a pair of kitchen tongs is a class 3 lever (effort in the middle). (a) True (b) False
33. 33.🔍 Which is the odd one out? (a) a wood screw (b) a chisel (c) a screw jack (d) a nut and bolt
34. 34.⚖️ A lever balances when … (a) turning effects match (b) the fulcrum moves (c) the bar is short (d) both weights are equal
35. 35.💪 A cart is pulled to the right with 85 N and to the left with 90 N. Which way does the net force act? (a) no net force (b) to the right (c) to the left
36. 36.💪 Is closing a drawer a push or a pull? (a) a pull (b) a push
37. 37.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 6 N, sandpaper 9 N, a glass sheet 2 N, a wooden plank 4 N. How many newtons more were needed on sandpaper than on a glass sheet?
38. 38.⚖️ A seesaw balances. Kabir (540 N) sits 4 m from the pivot on one side; Zoya (720 N) sits ? m from the pivot on the other side. What is the missing distance in metres?
39. 39.🏋️ A machine lifts a load of 280 N when you push with 70 N. What is its mechanical advantage (MA)?
40. 40.💪 Two equal forces push on a box from opposite sides. They are … (a) balanced (b) unbalanced (c) gravity (d) doubled

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