Engineering Worksheet: Part 2 Test

Engineering lesson 16: Part 2 test: forces and machines · Set 547 · 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 well winch has a handle (wheel) of radius 15 cm turning an axle of radius 5 cm. What is its mechanical advantage (MA)?
2. 2.🪝 Fixed or movable pulley: which one only changes direction? (a) a movable pulley (b) a fixed pulley
3. 3.💪 Which force is at work: a compass needle turns? (a) friction (b) gravity (c) magnetic force (d) muscular force
4. 4.🪝 Fixed or movable pulley: which one stays in one place? (a) a movable pulley (b) a fixed pulley
5. 5.🔍 Which is the odd one out? (a) a wheel on ball bearings (b) sand on a slippery path (c) a grippy rubber sole (d) a rough doormat
6. 6.🪝 A winch has a wheel of radius 9 cm and an axle of radius 3 cm. What effort on the wheel lifts a 120 N bucket on the axle, in newtons? (ideal)
7. 7.⚙️ Which simple machine is an axe blade? (a) wheel and axle (b) screw (c) wedge (d) pulley
8. 8.⚖️ A seesaw balances. Ravi (600 N) sits 3 m from the pivot on one side; Kabir (? N) sits 3 m from the pivot on the other side. What is the missing weight in newtons?
9. 9.True or false: chalk on a gym bar gives more friction. (a) False (b) True
10. 10.⚖️ A lever bar balances. The load is 250 N at ? cm from the fulcrum. The effort is 50 N at 50 cm from the fulcrum on the other side. What is the missing distance in centimetres?
11. 11.⚖️ A lever balances when … (a) both weights are equal (b) turning effects match (c) the fulcrum moves (d) the bar is short
12. 12.🏋️ A 9 kg box is lifted straight up by 1 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
13. 13.🏋️ Work is done when a force moves something … (a) without moving it (b) very slowly (c) only upwards (d) through a distance
14. 14.⚙️ Which simple machine is a claw hammer on a nail? (a) lever (b) screw (c) inclined plane (d) pulley
15. 15.True or false: kicking a football is a pull. (a) False (b) True
16. 16.🛞 Which surface gives the MOST friction to a sliding block? (a) ice (b) sandpaper (c) glass (d) polished marble
17. 17.⚙️ A wedge is … (a) a bar on a pivot (b) a rope on a wheel (c) two ramps back to back (d) a wheel on a rod
18. 18.True or false: a nutcracker is a wedge. (a) False (b) True
19. 19.💪 Is hitting a cricket ball a push or a pull? (a) a pull (b) a push
20. 20.🛞 More or less friction: a wheel on ball bearings? (a) less friction (b) more friction
21. 21.🏋️ Pushing a crate 1 m took 40 J of work. What force was used, in newtons?
22. 22.💪 A force is a … (a) kind of colour (b) type of sound (c) unit of time (d) push or a pull
23. 23.⚖️ A seesaw balances. Zoya (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?
24. 24.💪 Is plucking a mango a push or a pull? (a) a push (b) a pull
25. 25.True or false: plucking a mango is a push. (a) False (b) True
26. 26.🔍 Which is the odd one out? (a) a wet tiled floor (b) a tyre with deep treads (c) oil on a squeaky hinge (d) a wheel on ball bearings
27. 27.⚖️ Along a straight bar, measured from the left end, the effort is at 80 cm, the fulcrum at 40 cm and the load at 20 cm. Which class of lever is it? (a) class 1 (b) class 3 (c) class 2
28. 28.True or false: a wet tiled floor gives less friction. (a) False (b) True
29. 29.True or false: a fixed pulley is on a flagpole top. (a) True (b) False
30. 30.Which of these is a lever? (a) a truck loading ramp (b) a bottle opener (c) a chisel (d) a wood screw
31. 31.⚖️ A seesaw balances. Asha (? N) sits 2 m from the pivot on one side; Kabir (240 N) sits 4 m from the pivot on the other side. What is the missing weight in newtons?
32. 32.💪 Is a tug of war a push or a pull? (a) a push (b) a pull
33. 33.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 8 N, a glass sheet 2 N, a wooden plank 5 N, a carpet 6 N. Which surface gave the least friction? (a) a wooden plank (b) a glass sheet (c) sandpaper (d) a carpet
34. 34.💪 A box weighs 340 N. Taking 1 kg to weigh about 10 N, what is its mass in kilograms?
35. 35.⚖️ Which class of lever is a fishing rod? (a) class 1 (b) class 2 (c) class 3
36. 36.True or false: a crowbar is a class 1 lever (fulcrum in the middle). (a) True (b) False
37. 37.🛞 More or less friction: a tyre with deep treads? (a) more friction (b) less friction
38. 38.True or false: hitting a cricket ball is a pull. (a) True (b) False
39. 39.⚖️ Along a straight bar, measured from the left end, the effort is at 20 cm, the fulcrum at 40 cm and the load at 70 cm. Which class of lever is it? (a) class 1 (b) class 2 (c) class 3
40. 40.⚖️ In a class 3 lever, what is in the middle? (a) the fulcrum (b) the effort (c) the load (d) the pulley

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