Engineering Worksheet: Part 2 Test

Engineering lesson 16: Part 2 test: forces and machines · Set 31 · 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 bar balances. The load is ? N at 10 cm from the fulcrum. The effort is 60 N at 90 cm from the fulcrum on the other side. What is the missing force in newtons?
2. 2.🏋️ Pushing a crate 6 m took 840 J of work. What force was used, in newtons?
3. 3.🏋️ Can a simple machine reduce the work done? (a) yes, by half (b) yes, always (c) only on Mondays (d) no, work stays the same
4. 4.⚖️ A lever bar balances. The load is 240 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?
5. 5.🔍 Which is the odd one out? (a) a well winch handle (b) a steering wheel (c) a round doorknob (d) a crowbar
6. 6.⚙️ A wedge is … (a) a wheel on a rod (b) two ramps back to back (c) a bar on a pivot (d) a rope on a wheel
7. 7.🛞 Is friction helpful or a problem here: striking a matchstick? (a) helpful (b) a problem
8. 8.💪 Which force is at work: shoes grip the floor? (a) muscular force (b) gravity (c) magnetic force (d) friction
9. 9.⚖️ A seesaw balances. Kabir (390 N) sits ? m from the pivot on one side; Ravi (130 N) sits 3 m from the pivot on the other side. What is the missing distance in metres?
10. 10.⚙️ Most simple machines make work easier by letting us … (a) use a smaller force (b) switch off gravity (c) stop all friction (d) make new energy
11. 11.⚖️ On a seesaw, a heavier child should sit … (a) anywhere (b) on the pivot (c) farther from the pivot (d) closer to the pivot
12. 12.Which of these is a wedge? (a) a well winch handle (b) an axe blade (c) a round doorknob (d) a claw hammer on a nail
13. 13.🏋️ A force of 380 N did 3800 J of work. How many metres did the object move?
14. 14.True or false: a fixed pulley needs effort = load. (a) True (b) False
15. 15.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 6 N, a carpet 9 N, sandpaper 12 N, ice 4 N. Which surface gave the most friction? (a) a wooden plank (b) ice (c) a carpet (d) sandpaper
16. 16.True or false: a pair of scissors is a class 3 lever (effort in the middle). (a) True (b) False
17. 17.True or false: powder on a carrom board gives more friction. (a) False (b) True
18. 18.🛞 Is friction helpful or a problem here: a knot holding a rope? (a) a problem (b) helpful
19. 19.True or false: pulling a cart is a push. (a) True (b) False
20. 20.🏋️ A machine lifts a load of 40 N when you push with 20 N. What is its mechanical advantage (MA)?
21. 21.⚙️ Which simple machine is a water tap handle? (a) wedge (b) inclined plane (c) wheel and axle (d) lever
22. 22.🛞 Which surface gives the MOST friction to a sliding block? (a) glass (b) ice (c) polished marble (d) sandpaper
23. 23.🛞 How can we reduce friction in a machine? (a) make parts rough (b) add sand (c) oil the moving parts (d) press parts harder
24. 24.🏋️ A machine lifts a load of 450 N when you push with 150 N. What is its mechanical advantage (MA)?
25. 25.🪝 A bucket weighing 450 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.⚖️ A seesaw balances. Kabir (440 N) sits 3 m from the pivot on one side; Arjun (330 N) sits ? m from the pivot on the other side. What is the missing distance in metres?
27. 27.⚖️ A lever bar balances. The load is ? N at 30 cm from the fulcrum. The effort is 150 N at 70 cm from the fulcrum on the other side. What is the missing force in newtons?
28. 28.True or false: a door stopper is a wedge. (a) True (b) False
29. 29.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 1 N, a wooden plank 2 N, a carpet 3 N, sandpaper 4 N. Which surface gave the most friction? (a) a wooden plank (b) sandpaper (c) a glass sheet (d) a carpet
30. 30.⚖️ A seesaw balances. Ravi (? N) sits 4 m from the pivot on one side; Asha (400 N) sits 3 m from the pivot on the other side. What is the missing weight in newtons?
31. 31.True or false: a wheelchair ramp is an inclined plane. (a) False (b) True
32. 32.🔍 Which is the odd one out? (a) a grippy rubber sole (b) a box pushed on carpet (c) sand on a slippery path (d) a smooth steel slide
33. 33.🔍 Which is the odd one out? (a) a well winch handle (b) a steering wheel (c) a nut and bolt (d) a water tap handle
34. 34.🏋️ A 15 kg box is lifted straight up by 5 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
35. 35.🪝 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)
36. 36.💪 A box weighs 340 N. Taking 1 kg to weigh about 10 N, what is its mass in kilograms?
37. 37.🏋️ A 7 kg box is lifted straight up by 2 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
38. 38.⚖️ Along a straight bar, measured from the left end, the effort is at 30 cm, the fulcrum at 0 cm and the load at 50 cm. Which class of lever is it? (a) class 2 (b) class 1 (c) class 3
39. 39.⚖️ Going along a lever from one end to the other, the order is: fulcrum, effort, load. Which class of lever is it? (a) class 1 (b) class 3 (c) class 2
40. 40.True or false: a wheel on ball bearings gives more friction. (a) False (b) True

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