Engineering Worksheet: Part 2 Test

Engineering lesson 16: Part 2 test: forces and machines · Set 859 · 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.💪 Which force is at work: a thrown ball comes down? (a) gravity (b) muscular force (c) friction (d) magnetic force
3. 3.⚖️ Along a straight bar, measured from the left end, the effort is at 30 cm, the fulcrum at 90 cm and the load at 50 cm. Which class of lever is it? (a) class 1 (b) class 3 (c) class 2
4. 4.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 7 N, a carpet 8 N, sandpaper 11 N, a glass sheet 3 N. Which surface gave the most friction? (a) a glass sheet (b) a carpet (c) a wooden plank (d) sandpaper
5. 5.⚖️ A lever balances when … (a) the fulcrum moves (b) both weights are equal (c) turning effects match (d) the bar is short
6. 6.Which of these is a pulley? (a) a wood screw (b) a nut and bolt (c) a door stopper (d) a crane hook block
7. 7.🪝 A wheel and axle is a big wheel fixed to … (a) a flat ramp (b) a sharp wedge (c) a smaller rod (axle) (d) a loose rope
8. 8.True or false: pressing a doorbell is a push. (a) False (b) True
9. 9.⚖️ A seesaw balances. Ravi (? N) sits 4 m from the pivot on one side; Zoya (600 N) sits 3 m from the pivot on the other side. What is the missing weight in newtons?
10. 10.Which of these is caused by gravity? (a) lifting a school bag (b) brakes stop a bicycle (c) a fridge magnet sticks (d) an apple falls down
11. 11.True or false: a fixed pulley rises with the load. (a) False (b) True
12. 12.⚖️ A seesaw balances. Meena (480 N) sits ? m from the pivot on one side; Zoya (120 N) sits 4 m from the pivot on the other side. What is the missing distance in metres?
13. 13.True or false: closing a drawer is a pull. (a) False (b) True
14. 14.🏋️ Pushing a crate 6 m took 120 J of work. What force was used, in newtons?
15. 15.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 6 N, a carpet 9 N, ice 1 N, a glass sheet 3 N. Which surface gave the most friction? (a) a glass sheet (b) a wooden plank (c) ice (d) a carpet
16. 16.🪝 A pulley system lifts a 360 N load with an effort of 120 N. What is its mechanical advantage (MA)?
17. 17.True or false: a fixed pulley needs effort = load. (a) False (b) True
18. 18.⚖️ On a seesaw, a heavier child should sit … (a) closer to the pivot (b) anywhere (c) farther from the pivot (d) on the pivot
19. 19.💪 Which can a force NOT do? (a) change its shape (b) change its colour (c) start it moving (d) stop it moving
20. 20.True or false: kicking a football is a pull. (a) True (b) False
21. 21.True or false: a claw hammer on a nail is a pulley. (a) True (b) False
22. 22.🔍 Which is the odd one out? (a) a smooth steel slide (b) a wet tiled floor (c) a tyre with deep treads (d) a wheel on ball bearings
23. 23.🔍 Which is the odd one out? (a) a crowbar (b) a truck loading ramp (c) a seesaw (d) a nutcracker
24. 24.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 3 N, a wooden plank 6 N, a carpet 8 N, sandpaper 11 N. How many newtons more were needed on sandpaper than on a glass sheet?
25. 25.⚖️ A lever bar balances. The load is 240 N at ? cm from the fulcrum. The effort is 160 N at 60 cm from the fulcrum on the other side. What is the missing distance in centimetres?
26. 26.True or false: opening a drawer is a push. (a) False (b) True
27. 27.🏋️ Mechanical advantage (MA) = … (a) load × effort (b) load + effort (c) load ÷ effort (d) effort ÷ load
28. 28.🏋️ A smooth ramp is 5 m long and rises 1 m. What effort pushes a 3750 N box up it, in newtons? (ideal ramp, no friction)
29. 29.True or false: a crane hook block is a pulley. (a) False (b) True
30. 30.🛞 More or less friction: sand on a slippery path? (a) less friction (b) more friction
31. 31.⚖️ Going along a lever from one end to the other, the order is: load, fulcrum, effort. Which class of lever is it? (a) class 2 (b) class 3 (c) class 1
32. 32.Which of these is caused by friction? (a) a compass needle turns (b) an apple falls down (c) shoes grip the floor (d) pedalling a cycle
33. 33.⚖️ A lever bar balances. The load is ? N at 20 cm from the fulcrum. The effort is 120 N at 80 cm from the fulcrum on the other side. What is the missing force in newtons?
34. 34.⚖️ A seesaw balances. Asha (150 N) sits 3 m from the pivot on one side; Ravi (450 N) sits ? m from the pivot on the other side. What is the missing distance in metres?
35. 35.🏋️ Can a simple machine reduce the work done? (a) only on Mondays (b) yes, always (c) no, work stays the same (d) yes, by half
36. 36.Which of these is a lever? (a) a flagpole rope wheel (b) a wheelchair ramp (c) a bottle opener (d) a road up a hill
37. 37.💪 In a tug of war, one team pulls right with 25 N and the other pulls left with 20 N. What is the size of the net force, in newtons?
38. 38.⚖️ In a class 3 lever, what is in the middle? (a) the fulcrum (b) the load (c) the pulley (d) the effort
39. 39.⚖️ Along a straight bar, measured from the left end, the effort is at 60 cm, the fulcrum at 90 cm and the load at 20 cm. Which class of lever is it? (a) class 3 (b) class 2 (c) class 1
40. 40.💪 In a tug of war, one team pulls left with 45 N and the other pulls right with 35 N. What is the size of the net force, in newtons?

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