Engineering Worksheet: Part 2 Test

Engineering lesson 16: Part 2 test: forces and machines · Set 895 · 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 50 cm from the fulcrum. The effort is 50 N at 20 cm from the fulcrum on the other side. What is the missing force in newtons?
2. 2.🏋️ A force of 460 N pushes a cart 6 m along the floor. How much work is done, in joules?
3. 3.⚖️ Along a straight bar, measured from the left end, the effort is at 30 cm, the fulcrum at 60 cm and the load at 10 cm. Which class of lever is it? (a) class 2 (b) class 3 (c) class 1
4. 4.🛞 How can we reduce friction in a machine? (a) add sand (b) press parts harder (c) make parts rough (d) oil the moving parts
5. 5.True or false: a beam balance is a class 1 lever (fulcrum in the middle). (a) False (b) True
6. 6.⚖️ Which class of lever is a beam balance? (a) class 1 (b) class 2 (c) class 3
7. 7.⚖️ On a seesaw, a heavier child should sit … (a) anywhere (b) farther from the pivot (c) closer to the pivot (d) on the pivot
8. 8.⚖️ 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 3 (c) class 2
9. 9.🛞 Is friction helpful or a problem here: shoe soles wearing out? (a) a problem (b) helpful
10. 10.⚖️ Which class of lever is a broom when sweeping? (a) class 3 (b) class 1 (c) class 2
11. 11.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 7 N, sandpaper 11 N, ice 1 N, a glass sheet 5 N. How many newtons more were needed on sandpaper than on ice?
12. 12.🪝 A wheel and axle is a big wheel fixed to … (a) a smaller rod (axle) (b) a flat ramp (c) a sharp wedge (d) a loose rope
13. 13.⚖️ Which class of lever is a lemon squeezer? (a) class 1 (b) class 2 (c) class 3
14. 14.True or false: a crowbar is a class 2 lever (load in the middle). (a) True (b) False
15. 15.🏋️ Pushing a crate 4 m took 1600 J of work. What force was used, in newtons?
16. 16.🏋️ A force of 380 N pushes a cart 9 m along the floor. How much work is done, in joules?
17. 17.⚙️ A screw is really … (a) a tiny pulley (b) a ramp wrapped round (c) a kind of wheel (d) a bent lever
18. 18.🔍 Which is the odd one out? (a) a flagpole rope wheel (b) a well-bucket rope wheel (c) a nutcracker (d) a crane hook block
19. 19.⚖️ A seesaw balances. Kabir (600 N) sits 3 m from the pivot on one side; Arjun (? N) sits 3 m from the pivot on the other side. What is the missing weight in newtons?
20. 20.💪 Is pulling up your socks a push or a pull? (a) a push (b) a pull
21. 21.⚖️ What is the pivot point of a lever called? (a) the fulcrum (b) the load (c) the axle (d) the effort
22. 22.🏋️ In which unit is work measured? (a) newton (N) (b) watt hour (c) joule (J) (d) metre (m)
23. 23.🪝 Fixed or movable pulley: which one needs effort = load? (a) a fixed pulley (b) a movable pulley
24. 24.⚙️ Which simple machine is a crane hook block? (a) lever (b) inclined plane (c) screw (d) pulley
25. 25.⚖️ Turning effect = force × … (a) distance from fulcrum (b) time taken (c) mass of fulcrum (d) colour of bar
26. 26.True or false: a road up a hill is an inclined plane. (a) False (b) True
27. 27.Which of these is a pulley? (a) a flagpole rope wheel (b) a screw jack (c) a wheelchair ramp (d) a door stopper
28. 28.⚖️ Which class of lever is a wheelbarrow? (a) class 3 (b) class 2 (c) class 1
29. 29.🏋️ Pushing a crate 7 m took 2520 J of work. What force was used, in newtons?
30. 30.⚖️ A seesaw balances. Asha (720 N) sits 3 m from the pivot on one side; Ravi (540 N) sits ? m from the pivot on the other side. What is the missing distance in metres?
31. 31.⚙️ A wedge is … (a) a rope on a wheel (b) two ramps back to back (c) a bar on a pivot (d) a wheel on a rod
32. 32.🪝 A load of 60 N hangs from a pulley system in which 2 rope sections hold up the load. What effort is needed, in newtons? (ideal pulleys)
33. 33.⚖️ A lever bar balances. The load is ? N at 10 cm from the fulcrum. The effort is 70 N at 40 cm from the fulcrum on the other side. What is the missing force in newtons?
34. 34.🛞 More or less friction: oil on a squeaky hinge? (a) more friction (b) less friction
35. 35.⚖️ A lever bar balances. The load is 300 N at 20 cm from the fulcrum. The effort is 200 N at ? cm from the fulcrum on the other side. What is the missing distance in centimetres?
36. 36.🪝 A winch has a wheel of radius 6 cm and an axle of radius 1 cm. What effort on the wheel lifts a 1080 N bucket on the axle, in newtons? (ideal)
37. 37.⚙️ Which simple machine is a road up a hill? (a) wheel and axle (b) inclined plane (c) lever (d) pulley
38. 38.Which of these is a pulley? (a) a screw jack (b) a playground slide (c) a claw hammer on a nail (d) a window blind cord
39. 39.⚙️ Which simple machine is a bottle opener? (a) lever (b) pulley (c) inclined plane (d) wedge
40. 40.💪 A bag has a mass of 17 kg. Taking 1 kg to weigh about 10 N, what is its weight in newtons?

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