Engineering Worksheet: Part 2 Test

Engineering lesson 16: Part 2 test: forces and machines · Set 178 · 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 fixed pulley needs effort = load. (a) False (b) True
2. 2.💪 Two equal forces push on a box from opposite sides. They are … (a) balanced (b) doubled (c) unbalanced (d) gravity
3. 3.🪝 What does a single fixed pulley change? (a) the size of the load (b) the colour of rope (c) the direction of pull (d) gravity
4. 4.🛞 How can we reduce friction in a machine? (a) make parts rough (b) add sand (c) press parts harder (d) oil the moving parts
5. 5.⚖️ A lever balances when … (a) turning effects match (b) both weights are equal (c) the bar is short (d) the fulcrum moves
6. 6.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 4 N, a glass sheet 6 N, a wooden plank 7 N, sandpaper 9 N. Which surface gave the most friction? (a) ice (b) a glass sheet (c) a wooden plank (d) sandpaper
7. 7.🛞 Friction acts … (a) against the motion (b) only upwards (c) with the motion (d) only on ice
8. 8.⚖️ Which class of lever is a crowbar? (a) class 2 (b) class 1 (c) class 3
9. 9.🏋️ Pushing a crate 5 m took 300 J of work. What force was used, in newtons?
10. 10.⚖️ A seesaw balances. Ravi (760 N) sits ? m from the pivot on one side; Arjun (570 N) sits 4 m from the pivot on the other side. What is the missing distance in metres?
11. 11.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 1 N, a glass sheet 5 N, a wooden plank 8 N, sandpaper 9 N. How many newtons more were needed on sandpaper than on ice?
12. 12.🪝 A pulley system has 2 rope sections holding up the load. To lift the load by 1 m, how many metres of rope must you pull?
13. 13.True or false: a movable pulley makes you pull 2× rope. (a) True (b) False
14. 14.🛞 Is friction helpful or a problem here: a door hinge squeaking? (a) helpful (b) a problem
15. 15.🪝 A bucket weighing 360 N is lifted with a single fixed pulley at the top of a well. What effort is needed, in newtons? (ideal pulley, no friction)
16. 16.True or false: drawing up a well bucket is a pull. (a) False (b) True
17. 17.⚖️ A lever bar balances. The load is 160 N at ? cm from the fulcrum. The effort is 320 N at 20 cm from the fulcrum on the other side. What is the missing distance in centimetres?
18. 18.💪 Two children push a box to the right, one with 40 N and the other with 45 N. What is the net (total) force on the box, in newtons?
19. 19.True or false: a box pushed on carpet gives less friction. (a) True (b) False
20. 20.True or false: pulling up your socks is a push. (a) False (b) True
21. 21.💪 A bag has a mass of 57 kg. Taking 1 kg to weigh about 10 N, what is its weight in newtons?
22. 22.⚖️ On a seesaw, a heavier child should sit … (a) on the pivot (b) farther from the pivot (c) anywhere (d) closer to the pivot
23. 23.⚖️ A lever bar balances. The load is 300 N at 40 cm from the fulcrum. The effort is 240 N at ? cm from the fulcrum on the other side. What is the missing distance in centimetres?
24. 24.🏋️ In which unit is work measured? (a) metre (m) (b) newton (N) (c) watt hour (d) joule (J)
25. 25.💪 Which force is at work: a fridge magnet sticks? (a) friction (b) muscular force (c) magnetic force (d) gravity
26. 26.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 1 N, a glass sheet 3 N, a wooden plank 4 N, sandpaper 7 N. Which surface gave the most friction? (a) sandpaper (b) ice (c) a wooden plank (d) a glass sheet
27. 27.🪝 A pulley system lifts a 360 N load with an effort of 90 N. What is its mechanical advantage (MA)?
28. 28.True or false: a tyre with deep treads gives less friction. (a) False (b) True
29. 29.⚖️ Which class of lever is a bottle opener? (a) class 1 (b) class 3 (c) class 2
30. 30.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 4 N, a wooden plank 7 N, a carpet 11 N, ice 2 N. Which surface gave the least friction? (a) a carpet (b) a wooden plank (c) ice (d) a glass sheet
31. 31.True or false: a smooth steel slide gives more friction. (a) False (b) True
32. 32.True or false: a claw hammer on a nail is a lever. (a) False (b) True
33. 33.⚖️ Which class of lever is a wheelbarrow? (a) class 3 (b) class 1 (c) class 2
34. 34.⚖️ Which class of lever is a pair of tweezers? (a) class 2 (b) class 1 (c) class 3
35. 35.True or false: pressing a doorbell is a pull. (a) False (b) True
36. 36.🏋️ A force of 160 N pushes a cart 2 m along the floor. How much work is done, in joules?
37. 37.🛞 More or less friction: a wheel on ball bearings? (a) more friction (b) less friction
38. 38.🔍 Which is the odd one out? (a) a box pushed on carpet (b) chalk on a gym bar (c) a tyre with deep treads (d) a wheel on ball bearings
39. 39.⚖️ Along a straight bar, measured from the left end, the effort is at 20 cm, the fulcrum at 60 cm and the load at 40 cm. Which class of lever is it? (a) class 2 (b) class 3 (c) class 1
40. 40.🛞 Is friction helpful or a problem here: walking without slipping? (a) a problem (b) helpful

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