Engineering Worksheet: Part 2 Test

Engineering lesson 16: Part 2 test: forces and machines · Set 413 · 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.True or false: a crowbar is a pulley. (a) True (b) False
2. 2.💪 Which can a force NOT do? (a) start it moving (b) change its shape (c) change its colour (d) stop it moving
3. 3.⚖️ A lever bar balances. The load is 540 N at 10 cm from the fulcrum. The effort is 60 N at ? cm from the fulcrum on the other side. What is the missing distance in centimetres?
4. 4.🏋️ A smooth ramp is 6 m long and rises 2 m. What effort pushes a 300 N box up it, in newtons? (ideal ramp, no friction)
5. 5.💪 A force is a … (a) push or a pull (b) unit of time (c) kind of colour (d) type of sound
6. 6.⚖️ A lever bar balances. The load is 210 N at 40 cm from the fulcrum. The effort is 280 N at ? cm from the fulcrum on the other side. What is the missing distance in centimetres?
7. 7.🪝 Fixed or movable pulley: which one makes you pull 2× rope? (a) a fixed pulley (b) a movable pulley
8. 8.⚖️ Which class of lever is a crowbar? (a) class 2 (b) class 1 (c) class 3
9. 9.⚙️ Which simple machine is a nutcracker? (a) inclined plane (b) wheel and axle (c) pulley (d) lever
10. 10.🛞 Is friction helpful or a problem here: shoe soles wearing out? (a) helpful (b) a problem
11. 11.⚖️ Turning effect = force × … (a) mass of fulcrum (b) time taken (c) colour of bar (d) distance from fulcrum
12. 12.🛞 How can we reduce friction in a machine? (a) press parts harder (b) make parts rough (c) add sand (d) oil the moving parts
13. 13.True or false: skating on ice gives more friction. (a) False (b) True
14. 14.🏋️ Pushing a crate 9 m took 4410 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 glass sheet 8 N, a carpet 12 N, sandpaper 15 N, ice 4 N. Which surface gave the least friction? (a) sandpaper (b) a glass sheet (c) a carpet (d) ice
16. 16.True or false: a tug of war is a push. (a) True (b) False
17. 17.🏋️ A 2 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 wedge is … (a) a wheel on a rod (b) a bar on a pivot (c) two ramps back to back (d) a rope on a wheel
19. 19.🏋️ Can a simple machine reduce the work done? (a) no, work stays the same (b) only on Mondays (c) yes, always (d) yes, by half
20. 20.⚖️ A lever bar balances. The load is ? N at 10 cm from the fulcrum. The effort is 80 N at 40 cm from the fulcrum on the other side. What is the missing force in newtons?
21. 21.⚖️ On a seesaw, a heavier child should sit … (a) closer to the pivot (b) on the pivot (c) farther from the pivot (d) anywhere
22. 22.🛞 Why are tyres made with deep treads? (a) to go slower (b) to grip the road (c) to look nice (d) to save rubber
23. 23.⚖️ A lever bar balances. The load is 540 N at 50 cm from the fulcrum. The effort is ? N at 90 cm from the fulcrum on the other side. What is the missing force in newtons?
24. 24.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 6 N, a wooden plank 10 N, sandpaper 11 N, ice 4 N. Which surface gave the most friction? (a) a glass sheet (b) a wooden plank (c) sandpaper (d) ice
25. 25.🪝 A bucket weighing 30 N is lifted with a single fixed pulley at the top of a well. What effort is needed, in newtons? (ideal pulley, no friction)
26. 26.True or false: kicking a football is a push. (a) True (b) False
27. 27.⚙️ Which simple machine is a road up a hill? (a) inclined plane (b) pulley (c) wedge (d) wheel and axle
28. 28.True or false: a wheel on ball bearings gives more friction. (a) True (b) False
29. 29.💪 In which unit do we measure force? (a) metre (m) (b) newton (N) (c) litre (L) (d) second (s)
30. 30.🏋️ Pushing a crate 6 m took 2340 J of work. What force was used, in newtons?
31. 31.⚖️ A seesaw balances. Ravi (? N) sits 3 m from the pivot on one side; Kabir (480 N) sits 3 m from the pivot on the other side. What is the missing weight in newtons?
32. 32.⚖️ A lever balances when … (a) the bar is short (b) both weights are equal (c) turning effects match (d) the fulcrum moves
33. 33.🛞 More or less friction: a wet tiled floor? (a) more friction (b) less friction
34. 34.💪 A cart is pulled to the right with 35 N and to the left with 30 N. Which way does the net force act? (a) to the left (b) no net force (c) to the right
35. 35.🔍 Which is the odd one out? (a) the tip of a nail (b) a wood screw (c) a jar lid (d) a nut and bolt
36. 36.💪 Is hitting a cricket ball a push or a pull? (a) a push (b) a pull
37. 37.💪 In a tug of war, one team pulls left with 25 N and the other pulls right with 20 N. What is the size of the net force, in newtons?
38. 38.🏋️ Mechanical advantage (MA) = … (a) load ÷ effort (b) effort ÷ load (c) load × effort (d) load + effort
39. 39.⚖️ In a class 2 lever, what is in the middle? (a) the fulcrum (b) the effort (c) the load (d) the axle
40. 40.⚖️ A lever bar balances. The load is ? N at 20 cm from the fulcrum. The effort is 40 N at 70 cm from the fulcrum on the other side. What is the missing force in newtons?

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