Engineering Worksheet: Part 2 Test

Engineering lesson 16: Part 2 test: forces and machines · Set 258 · 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 load of 240 N hangs from a pulley system in which 4 rope sections hold up the load. What effort is needed, in newtons? (ideal pulleys)
2. 2.🏋️ Pushing a crate 8 m took 80 J of work. What force was used, in newtons?
3. 3.Which of these is a wedge? (a) a nutcracker (b) a seesaw (c) an axe blade (d) a round doorknob
4. 4.Which of these is caused by friction? (a) lifting a school bag (b) an apple falls down (c) a thrown ball comes down (d) rubbing hands warms them
5. 5.🔍 Which is the odd one out? (a) a wet tiled floor (b) a wheel on ball bearings (c) skating on ice (d) a tyre with deep treads
6. 6.🏋️ A force of 180 N did 720 J of work. How many metres did the object move?
7. 7.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 5 N, a glass sheet 1 N, a wooden plank 2 N, a carpet 4 N. Which surface gave the least friction? (a) a carpet (b) a glass sheet (c) a wooden plank (d) sandpaper
8. 8.🛞 How can we reduce friction in a machine? (a) oil the moving parts (b) add sand (c) press parts harder (d) make parts rough
9. 9.💪 Which force is at work: lifting a school bag? (a) friction (b) gravity (c) magnetic force (d) muscular force
10. 10.🛞 Is friction helpful or a problem here: shoe soles wearing out? (a) a problem (b) helpful
11. 11.⚖️ 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 1 (c) class 2
12. 12.True or false: a seesaw is a class 1 lever (fulcrum in the middle). (a) False (b) True
13. 13.True or false: kicking a football is a pull. (a) False (b) True
14. 14.🏋️ Work is done when a force moves something … (a) only upwards (b) through a distance (c) without moving it (d) very slowly
15. 15.🏋️ A force of 420 N did 3360 J of work. How many metres did the object move?
16. 16.🏋️ A machine lifts a load of 650 N when you push with 130 N. What is its mechanical advantage (MA)?
17. 17.💪 In which unit do we measure force? (a) second (s) (b) metre (m) (c) newton (N) (d) litre (L)
18. 18.Which of these is caused by gravity? (a) a rolling ball slows (b) pedalling a cycle (c) a fridge magnet sticks (d) an apple falls down
19. 19.🏋️ Can a simple machine reduce the work done? (a) no, work stays the same (b) yes, always (c) only on Mondays (d) yes, by half
20. 20.🔍 Which is the odd one out? (a) a chisel (b) an axe blade (c) a wheelchair ramp (d) the tip of a nail
21. 21.True or false: a grippy rubber sole gives more friction. (a) True (b) False
22. 22.True or false: a broom when sweeping is a class 1 lever (fulcrum in the middle). (a) False (b) True
23. 23.⚖️ A seesaw balances. Meena (? N) sits 3 m from the pivot on one side; Zoya (540 N) sits 4 m from the pivot on the other side. What is the missing weight in newtons?
24. 24.True or false: a tug of war is a pull. (a) False (b) True
25. 25.⚖️ On a seesaw, a heavier child should sit … (a) anywhere (b) on the pivot (c) closer to the pivot (d) farther from the pivot
26. 26.⚖️ Going along a lever from one end to the other, the order is: load, effort, fulcrum. Which class of lever is it? (a) class 3 (b) class 1 (c) class 2
27. 27.🪝 Fixed or movable pulley: which one rises with the load? (a) a movable pulley (b) a fixed pulley
28. 28.🪝 Fixed or movable pulley: which one stays in one place? (a) a movable pulley (b) a fixed pulley
29. 29.💪 In a tug of war, one team pulls right with 50 N and the other pulls left with 20 N. What is the size of the net force, in newtons?
30. 30.🏋️ Pushing a crate 6 m took 2160 J of work. What force was used, in newtons?
31. 31.True or false: powder on a carrom board gives less friction. (a) False (b) True
32. 32.💪 A box weighs 270 N. Taking 1 kg to weigh about 10 N, what is its mass in kilograms?
33. 33.⚙️ Which simple machine is a round doorknob? (a) lever (b) wedge (c) screw (d) wheel and axle
34. 34.🪝 A pulley system has 3 rope sections holding up the load. To lift the load by 6 m, how many metres of rope must you pull?
35. 35.🏋️ A force of 50 N pushes a cart 3 m along the floor. How much work is done, in joules?
36. 36.True or false: skating on ice gives more friction. (a) True (b) False
37. 37.🏋️ A 13 kg box is lifted straight up by 2 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
38. 38.True or false: a movable pulley is on a flagpole top. (a) False (b) True
39. 39.True or false: a fixed pulley makes you pull 2× rope. (a) False (b) True
40. 40.🏋️ In which unit is work measured? (a) joule (J) (b) watt hour (c) newton (N) (d) metre (m)

Free engineering lessons, practice and worksheets at talentjr.in/engineering-for-kids