Engineering Worksheet: Part 2 Test

Engineering lesson 16: Part 2 test: forces and machines · Set 968 · 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 lever balances when … (a) both weights are equal (b) the bar is short (c) turning effects match (d) the fulcrum moves
2. 2.🛞 Which surface gives the MOST friction to a sliding block? (a) glass (b) polished marble (c) sandpaper (d) ice
3. 3.⚖️ A seesaw balances. Zoya (200 N) sits 1 m from the pivot on one side; Asha (200 N) sits ? m from the pivot on the other side. What is the missing distance in metres?
4. 4.True or false: a tyre with deep treads gives less friction. (a) False (b) True
5. 5.⚖️ Turning effect = force × … (a) mass of fulcrum (b) colour of bar (c) distance from fulcrum (d) time taken
6. 6.⚖️ A lever bar balances. The load is 180 N at 20 cm from the fulcrum. The effort is 120 N at ? cm from the fulcrum on the other side. What is the missing distance in centimetres?
7. 7.⚖️ On a seesaw, a heavier child should sit … (a) on the pivot (b) closer to the pivot (c) farther from the pivot (d) anywhere
8. 8.⚖️ What is the pivot point of a lever called? (a) the axle (b) the effort (c) the load (d) the fulcrum
9. 9.🔍 Which is the odd one out? (a) a door stopper (b) a flagpole rope wheel (c) a crane hook block (d) a window blind cord
10. 10.Which of these is caused by muscular force? (a) a compass needle turns (b) a magnet picks up pins (c) shoes grip the floor (d) pedalling a cycle
11. 11.🏋️ A force of 200 N did 800 J of work. How many metres did the object move?
12. 12.⚙️ Which simple machine is a door stopper? (a) wedge (b) wheel and axle (c) screw (d) lever
13. 13.🔍 Which is the odd one out? (a) a bottle opener (b) a seesaw (c) a screw jack (d) a crowbar
14. 14.🏋️ A machine lifts a load of 520 N when you push with 130 N. What is its mechanical advantage (MA)?
15. 15.🪝 A wheel and axle is a big wheel fixed to … (a) a smaller rod (axle) (b) a sharp wedge (c) a flat ramp (d) a loose rope
16. 16.⚙️ Most simple machines make work easier by letting us … (a) make new energy (b) switch off gravity (c) stop all friction (d) use a smaller force
17. 17.🏋️ A 10 kg box is lifted straight up by 1 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
18. 18.🪝 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)
19. 19.True or false: a seesaw is a class 2 lever (load in the middle). (a) True (b) False
20. 20.🛞 More or less friction: skating on ice? (a) less friction (b) more friction
21. 21.💪 Two children push a box to the right, one with 5 N and the other with 25 N. What is the net (total) force on the box, in newtons?
22. 22.🛞 How can we reduce friction in a machine? (a) press parts harder (b) add sand (c) make parts rough (d) oil the moving parts
23. 23.🏋️ Pushing a crate 9 m took 1530 J of work. What force was used, in newtons?
24. 24.🛞 More or less friction: a wheel on ball bearings? (a) more friction (b) less friction
25. 25.💪 Is pushing a swing a push or a pull? (a) a pull (b) a push
26. 26.Which of these is a pulley? (a) a claw hammer on a nail (b) a round doorknob (c) a well-bucket rope wheel (d) a screw jack
27. 27.🛞 Friction acts … (a) only upwards (b) with the motion (c) against the motion (d) only on ice
28. 28.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 3 N, a glass sheet 7 N, a wooden plank 8 N, sandpaper 9 N. Which surface gave the least friction? (a) sandpaper (b) a glass sheet (c) a wooden plank (d) ice
29. 29.Which of these is a lever? (a) a wood screw (b) a bottle cap (c) an axe blade (d) a claw hammer on a nail
30. 30.🏋️ A longer ramp to the same height needs … (a) the same effort (b) less effort (c) more effort (d) no effort
31. 31.⚖️ A lever bar balances. The load is ? N at 20 cm from the fulcrum. The effort is 200 N at 20 cm from the fulcrum on the other side. What is the missing force in newtons?
32. 32.True or false: hitting a cricket ball is a pull. (a) False (b) True
33. 33.🛞 Is friction helpful or a problem here: dragging a heavy box? (a) a problem (b) helpful
34. 34.🏋️ A smooth ramp is 2 m long and rises 1 m. What effort pushes an 800 N box up it, in newtons? (ideal ramp, no friction)
35. 35.⚖️ Going along a lever from one end to the other, the order is: fulcrum, load, effort. Which class of lever is it? (a) class 3 (b) class 2 (c) class 1
36. 36.🛞 More or less friction: a wet tiled floor? (a) more friction (b) less friction
37. 37.⚖️ A lever bar balances. The load is 70 N at 20 cm from the fulcrum. The effort is 20 N at ? cm from the fulcrum on the other side. What is the missing distance in centimetres?
38. 38.⚖️ In a class 1 lever, what is in the middle? (a) the effort (b) the load (c) nothing (d) the fulcrum
39. 39.💪 In a tug of war, one team pulls left with 55 N and the other pulls right with 35 N. What is the size of the net force, in newtons?
40. 40.⚙️ Which simple machine is a flagpole rope wheel? (a) screw (b) wheel and axle (c) pulley (d) inclined plane

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