Engineering Worksheet: Part 2 Test

Engineering lesson 16: Part 2 test: forces and machines · Set 993 · 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 wheel on ball bearings gives less friction. (a) False (b) True
2. 2.True or false: a well winch handle is a wheel and axle. (a) True (b) False
3. 3.💪 Which can a force NOT do? (a) start it moving (b) stop it moving (c) change its colour (d) change its shape
4. 4.⚖️ A lever bar balances. The load is 80 N at ? cm from the fulcrum. The effort is 40 N at 20 cm from the fulcrum on the other side. What is the missing distance in centimetres?
5. 5.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 5 N, a wooden plank 8 N, a carpet 12 N, ice 2 N. Which surface gave the most friction? (a) ice (b) a carpet (c) a wooden plank (d) a glass sheet
6. 6.🛞 Friction acts … (a) against the motion (b) only on ice (c) only upwards (d) with the motion
7. 7.⚖️ On a seesaw, a heavier child should sit … (a) farther from the pivot (b) closer to the pivot (c) on the pivot (d) anywhere
8. 8.True or false: a smooth steel slide gives less friction. (a) True (b) False
9. 9.🏋️ A 20 kg box is lifted straight up by 3 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
10. 10.⚖️ A seesaw balances. Asha (220 N) sits 2 m from the pivot on one side; Zoya (? N) sits 2 m from the pivot on the other side. What is the missing weight in newtons?
11. 11.🏋️ A smooth ramp is 6 m long and rises 1 m. What effort pushes a 6000 N box up it, in newtons? (ideal ramp, no friction)
12. 12.💪 Is pressing a doorbell a push or a pull? (a) a pull (b) a push
13. 13.🔍 Which is the odd one out? (a) a rough doormat (b) a wet tiled floor (c) a wheel on ball bearings (d) oil on a squeaky hinge
14. 14.True or false: plucking a mango is a push. (a) False (b) True
15. 15.🛞 Is friction helpful or a problem here: tyres wearing down? (a) a problem (b) helpful
16. 16.Which of these is a pulley? (a) a road up a hill (b) a nut and bolt (c) a flagpole rope wheel (d) a seesaw
17. 17.True or false: a smooth steel slide gives more friction. (a) True (b) False
18. 18.🪝 A pulley system lifts a 240 N load with an effort of 120 N. What is its mechanical advantage (MA)?
19. 19.🪝 A winch has a wheel of radius 30 cm and an axle of radius 5 cm. What effort on the wheel lifts a 1020 N bucket on the axle, in newtons? (ideal)
20. 20.🔍 Which is the odd one out? (a) a wet tiled floor (b) a box pushed on carpet (c) oil on a squeaky hinge (d) powder on a carrom board
21. 21.Which of these is caused by gravity? (a) squeezing a lemon (b) a thrown ball comes down (c) a fridge magnet sticks (d) rubbing hands warms them
22. 22.⚖️ A lever bar balances. The load is ? N at 50 cm from the fulcrum. The effort is 150 N at 50 cm from the fulcrum on the other side. What is the missing force in newtons?
23. 23.🪝 A pulley system lifts a 360 N load with an effort of 180 N. What is its mechanical advantage (MA)?
24. 24.🏋️ Mechanical advantage (MA) = … (a) load ÷ effort (b) load × effort (c) effort ÷ load (d) load + effort
25. 25.🏋️ Work is done when a force moves something … (a) through a distance (b) very slowly (c) only upwards (d) without moving it
26. 26.Which of these is caused by magnetic force? (a) pedalling a cycle (b) squeezing a lemon (c) a compass needle turns (d) a thrown ball comes down
27. 27.⚖️ A seesaw balances. Zoya (560 N) sits ? m from the pivot on one side; Ravi (560 N) sits 4 m from the pivot on the other side. What is the missing distance in metres?
28. 28.🏋️ Pushing a crate 10 m took 4100 J of work. What force was used, in newtons?
29. 29.💪 Is a tug of war a push or a pull? (a) a pull (b) a push
30. 30.🏋️ Pushing a crate 7 m took 2520 J of work. What force was used, in newtons?
31. 31.🪝 A winch has a wheel of radius 18 cm and an axle of radius 3 cm. What effort on the wheel lifts a 1200 N bucket on the axle, in newtons? (ideal)
32. 32.⚖️ A lever bar balances. The load is 120 N at 20 cm from the fulcrum. The effort is ? N at 30 cm from the fulcrum on the other side. What is the missing force in newtons?
33. 33.💪 Is kicking a football a push or a pull? (a) a pull (b) a push
34. 34.🏋️ A force of 180 N pushes a cart 1 m along the floor. How much work is done, in joules?
35. 35.Which of these is caused by friction? (a) an apple falls down (b) a thrown ball comes down (c) a rolling ball slows (d) lifting a school bag
36. 36.🪝 Fixed or movable pulley: which one halves the effort? (a) a fixed pulley (b) a movable pulley
37. 37.🛞 Why are tyres made with deep treads? (a) to look nice (b) to grip the road (c) to save rubber (d) to go slower
38. 38.🏋️ A force of 160 N pushes a cart 7 m along the floor. How much work is done, in joules?
39. 39.⚖️ Along a straight bar, measured from the left end, the effort is at 20 cm, the fulcrum at 70 cm and the load at 30 cm. Which class of lever is it? (a) class 3 (b) class 1 (c) class 2
40. 40.💪 Is pulling up your socks a push or a pull? (a) a push (b) a pull

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