Engineering Worksheet: Part 2 Test

Engineering lesson 16: Part 2 test: forces and machines · Set 776 · 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 90 N at ? cm from the fulcrum. The effort is 20 N at 90 cm from the fulcrum on the other side. What is the missing distance in centimetres?
2. 2.⚖️ A seesaw balances. Ravi (? N) sits 1 m from the pivot on one side; Kabir (160 N) sits 3 m from the pivot on the other side. What is the missing weight in newtons?
3. 3.🪝 What does a single fixed pulley change? (a) the colour of rope (b) the direction of pull (c) the size of the load (d) gravity
4. 4.⚖️ Along a straight bar, measured from the left end, the effort is at 0 cm, the fulcrum at 40 cm and the load at 20 cm. Which class of lever is it? (a) class 2 (b) class 1 (c) class 3
5. 5.🏋️ Pushing a crate 1 m took 340 J of work. What force was used, in newtons?
6. 6.💪 A box weighs 450 N. Taking 1 kg to weigh about 10 N, what is its mass in kilograms?
7. 7.🪝 Fixed or movable pulley: which one stays in one place? (a) a fixed pulley (b) a movable pulley
8. 8.💪 Is opening a drawer a push or a pull? (a) a push (b) a pull
9. 9.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 12 N, ice 3 N, a glass sheet 6 N, a wooden plank 10 N. Which surface gave the least friction? (a) a glass sheet (b) ice (c) a carpet (d) a wooden plank
10. 10.⚙️ Which simple machine is a window blind cord? (a) wheel and axle (b) lever (c) screw (d) pulley
11. 11.⚖️ A lever bar balances. The load is 400 N at 20 cm from the fulcrum. The effort is ? N at 40 cm from the fulcrum on the other side. What is the missing force in newtons?
12. 12.Which of these is a pulley? (a) a chisel (b) a truck loading ramp (c) a water tap handle (d) a flagpole rope wheel
13. 13.True or false: a fixed pulley rises with the load. (a) False (b) True
14. 14.True or false: a fixed pulley is on a flagpole top. (a) False (b) True
15. 15.🪝 Fixed or movable pulley: which one halves the effort? (a) a movable pulley (b) a fixed pulley
16. 16.Which of these is a wedge? (a) a bottle opener (b) the tip of a nail (c) a nut and bolt (d) a crowbar
17. 17.⚙️ Which simple machine is a door stopper? (a) inclined plane (b) lever (c) wedge (d) pulley
18. 18.💪 Is pushing a trolley a push or a pull? (a) a push (b) a pull
19. 19.Which of these is caused by friction? (a) an apple falls down (b) a rolling ball slows (c) a river flows downhill (d) squeezing a lemon
20. 20.True or false: a seesaw is a class 1 lever (fulcrum in the middle). (a) True (b) False
21. 21.💪 In a tug of war, one team pulls right with 20 N and the other pulls left with 5 N. What is the size of the net force, in newtons?
22. 22.⚖️ Turning effect = force × … (a) time taken (b) mass of fulcrum (c) distance from fulcrum (d) colour of bar
23. 23.🪝 A winch has a wheel of radius 2 cm and an axle of radius 1 cm. What effort on the wheel lifts a 180 N bucket on the axle, in newtons? (ideal)
24. 24.🛞 More or less friction: a grippy rubber sole? (a) less friction (b) more friction
25. 25.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 5 N, sandpaper 8 N, ice 2 N, a glass sheet 3 N. Which surface gave the most friction? (a) a glass sheet (b) ice (c) sandpaper (d) a carpet
26. 26.🏋️ A force of 300 N did 300 J of work. How many metres did the object move?
27. 27.True or false: a rough doormat gives less friction. (a) True (b) False
28. 28.🏋️ A smooth ramp is 2 m long and rises 1 m. What effort pushes a 2000 N box up it, in newtons? (ideal ramp, no friction)
29. 29.🪝 Fixed or movable pulley: which one needs effort = load? (a) a movable pulley (b) a fixed pulley
30. 30.🏋️ A smooth ramp is 12 m long and rises 3 m. What effort pushes a 1600 N box up it, in newtons? (ideal ramp, no friction)
31. 31.True or false: a wheel on ball bearings gives less friction. (a) True (b) False
32. 32.💪 A cart is pulled to the right with 95 N and to the left with 105 N. Which way does the net force act? (a) to the right (b) no net force (c) to the left
33. 33.🔍 Which is the odd one out? (a) skating on ice (b) a tyre with deep treads (c) a wet tiled floor (d) oil on a squeaky hinge
34. 34.🛞 Is friction helpful or a problem here: striking a matchstick? (a) helpful (b) a problem
35. 35.⚖️ A seesaw balances. Kabir (510 N) sits 1 m from the pivot on one side; Ravi (? N) sits 3 m from the pivot on the other side. What is the missing weight in newtons?
36. 36.🏋️ In which unit is work measured? (a) watt hour (b) metre (m) (c) joule (J) (d) newton (N)
37. 37.🪝 Fixed or movable pulley: which one rises with the load? (a) a movable pulley (b) a fixed pulley
38. 38.⚖️ A lever bar balances. The load is 700 N at ? cm from the fulcrum. The effort is 140 N at 100 cm from the fulcrum on the other side. What is the missing distance in centimetres?
39. 39.🪝 A wheel and axle is a big wheel fixed to … (a) a flat ramp (b) a smaller rod (axle) (c) a loose rope (d) a sharp wedge
40. 40.⚖️ A lever bar balances. The load is 240 N at 30 cm from the fulcrum. The effort is ? N at 40 cm from the fulcrum on the other side. What is the missing force in newtons?

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