Engineering Worksheet: Part 2 Test

Engineering lesson 16: Part 2 test: forces and machines · Set 546 · 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 round doorknob is a wheel and axle. (a) True (b) False
2. 2.🔍 Which is the odd one out? (a) oil on a squeaky hinge (b) a smooth steel slide (c) a tyre with deep treads (d) a wet tiled floor
3. 3.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 2 N, a glass sheet 3 N, a carpet 6 N, sandpaper 9 N. Which surface gave the least friction? (a) a glass sheet (b) sandpaper (c) ice (d) a carpet
4. 4.💪 Which force is at work: lifting a school bag? (a) magnetic force (b) gravity (c) muscular force (d) friction
5. 5.💪 Which force is at work: rain falls to the ground? (a) gravity (b) magnetic force (c) friction (d) muscular force
6. 6.🏋️ Mechanical advantage (MA) = … (a) load × effort (b) effort ÷ load (c) load + effort (d) load ÷ effort
7. 7.⚖️ Along a straight bar, measured from the left end, the effort is at 80 cm, the fulcrum at 20 cm and the load at 40 cm. Which class of lever is it? (a) class 2 (b) class 1 (c) class 3
8. 8.Which of these is an inclined plane? (a) a steering wheel (b) a road up a hill (c) a crowbar (d) a door stopper
9. 9.🪝 Fixed or movable pulley: which one makes you pull 2× rope? (a) a movable pulley (b) a fixed pulley
10. 10.💪 Is drawing up a well bucket a push or a pull? (a) a push (b) a pull
11. 11.🏋️ Pushing a crate 5 m took 2250 J of work. What force was used, in newtons?
12. 12.🪝 What does a single fixed pulley change? (a) the size of the load (b) the direction of pull (c) the colour of rope (d) gravity
13. 13.True or false: a movable pulley stays in one place. (a) False (b) True
14. 14.💪 A cart is pulled to the right with 45 N and to the left with 45 N. Which way does the net force act? (a) to the left (b) no net force (c) to the right
15. 15.⚖️ A seesaw balances. Ravi (360 N) sits 1 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?
16. 16.🏋️ A force of 100 N did 200 J of work. How many metres did the object move?
17. 17.🪝 A load of 420 N hangs from a pulley system in which 3 rope sections hold up the load. What effort is needed, in newtons? (ideal pulleys)
18. 18.🏋️ A 14 kg box is lifted straight up by 1 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
19. 19.🪝 More rope sections holding a load means … (a) no change (b) more effort needed (c) the load floats (d) less effort needed
20. 20.True or false: a tug of war is a pull. (a) True (b) False
21. 21.⚖️ A lever bar balances. The load is 400 N at 50 cm from the fulcrum. The effort is 500 N at ? cm from the fulcrum on the other side. What is the missing distance in centimetres?
22. 22.🪝 A winch has a wheel of radius 20 cm and an axle of radius 5 cm. What effort on the wheel lifts a 480 N bucket on the axle, in newtons? (ideal)
23. 23.⚙️ Which simple machine is a crowbar? (a) pulley (b) screw (c) inclined plane (d) lever
24. 24.True or false: a fixed pulley is on a flagpole top. (a) False (b) True
25. 25.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 5 N, a wooden plank 7 N, sandpaper 9 N, ice 1 N. How many newtons more were needed on sandpaper than on ice?
26. 26.💪 A cart is pulled to the right with 20 N and to the left with 15 N. Which way does the net force act? (a) no net force (b) to the left (c) to the right
27. 27.⚖️ A lever balances when … (a) both weights are equal (b) the bar is short (c) turning effects match (d) the fulcrum moves
28. 28.⚖️ Which class of lever is a beam balance? (a) class 1 (b) class 2 (c) class 3
29. 29.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 5 N, a carpet 9 N, sandpaper 10 N, a glass sheet 3 N. Which surface gave the most friction? (a) sandpaper (b) a carpet (c) a wooden plank (d) a glass sheet
30. 30.⚖️ A lever bar balances. The load is ? N at 10 cm from the fulcrum. The effort is 90 N at 90 cm from the fulcrum on the other side. What is the missing force in newtons?
31. 31.⚖️ To lift a heavy rock with a crowbar more easily, push … (a) near the fulcrum (b) far from the fulcrum (c) on the rock (d) on the fulcrum
32. 32.🏋️ A longer ramp to the same height needs … (a) more effort (b) no effort (c) the same effort (d) less effort
33. 33.🛞 Why are tyres made with deep treads? (a) to look nice (b) to go slower (c) to save rubber (d) to grip the road
34. 34.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 2 N, a carpet 5 N, sandpaper 7 N, ice 1 N. Which surface gave the most friction? (a) sandpaper (b) a carpet (c) a wooden plank (d) ice
35. 35.⚖️ A lever bar balances. The load is ? N at 10 cm from the fulcrum. The effort is 70 N at 30 cm from the fulcrum on the other side. What is the missing force in newtons?
36. 36.🪝 A winch has a wheel of radius 8 cm and an axle of radius 1 cm. What effort on the wheel lifts a 1120 N bucket on the axle, in newtons? (ideal)
37. 37.⚖️ A seesaw balances. Asha (760 N) sits 1 m from the pivot on one side; Kabir (190 N) sits ? m from the pivot on the other side. What is the missing distance in metres?
38. 38.True or false: an axe blade is an inclined plane. (a) True (b) False
39. 39.🏋️ A force of 120 N did 840 J of work. How many metres did the object move?
40. 40.⚖️ Going along a lever from one end to the other, the order is: fulcrum, load, effort. Which class of lever is it? (a) class 1 (b) class 2 (c) class 3

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