Engineering Worksheet: Part 2 Test

Engineering lesson 16: Part 2 test: forces and machines · Set 340 · 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 rough doormat gives less friction. (a) False (b) True
2. 2.💪 A box weighs 80 N. Taking 1 kg to weigh about 10 N, what is its mass in kilograms?
3. 3.🏋️ In which unit is work measured? (a) metre (m) (b) joule (J) (c) watt hour (d) newton (N)
4. 4.⚖️ Turning effect = force × … (a) mass of fulcrum (b) distance from fulcrum (c) time taken (d) colour of bar
5. 5.💪 A force is a … (a) kind of colour (b) push or a pull (c) unit of time (d) type of sound
6. 6.💪 Which force is at work: shoes grip the floor? (a) magnetic force (b) gravity (c) friction (d) muscular force
7. 7.🔍 Which is the odd one out? (a) powder on a carrom board (b) oil on a squeaky hinge (c) a grippy rubber sole (d) a wet tiled floor
8. 8.🔍 Which is the odd one out? (a) a well-bucket rope wheel (b) a window blind cord (c) a flagpole rope wheel (d) a road up a hill
9. 9.True or false: a seesaw is a class 3 lever (effort in the middle). (a) True (b) False
10. 10.Which of these is caused by magnetic force? (a) a compass needle turns (b) lifting a school bag (c) a river flows downhill (d) a rolling ball slows
11. 11.🪝 A winch has a wheel of radius 5 cm and an axle of radius 1 cm. What effort on the wheel lifts a 650 N bucket on the axle, in newtons? (ideal)
12. 12.💪 A cart is pulled to the right with 60 N and to the left with 70 N. Which way does the net force act? (a) no net force (b) to the left (c) to the right
13. 13.🔍 Which is the odd one out? (a) chalk on a gym bar (b) sand on a slippery path (c) a rough doormat (d) a wet tiled floor
14. 14.🪝 More rope sections holding a load means … (a) less effort needed (b) no change (c) more effort needed (d) the load floats
15. 15.⚖️ A lever bar balances. The load is ? N at 10 cm from the fulcrum. The effort is 100 N at 70 cm from the fulcrum on the other side. What is the missing force in newtons?
16. 16.⚖️ In a class 3 lever, what is in the middle? (a) the pulley (b) the effort (c) the fulcrum (d) the load
17. 17.💪 In a tug of war, one team pulls right with 65 N and the other pulls left with 25 N. What is the size of the net force, in newtons?
18. 18.Which of these is caused by friction? (a) lifting a school bag (b) a river flows downhill (c) brakes stop a bicycle (d) rain falls to the ground
19. 19.True or false: a claw hammer on a nail is a lever. (a) False (b) True
20. 20.🪝 Fixed or movable pulley: which one needs effort = load? (a) a fixed pulley (b) a movable pulley
21. 21.🏋️ A smooth ramp is 2 m long and rises 1 m. What effort pushes a 1900 N box up it, in newtons? (ideal ramp, no friction)
22. 22.True or false: pushing a trolley is a push. (a) False (b) True
23. 23.💪 Two children push a box to the right, one with 85 N and the other with 15 N. What is the net (total) force on the box, in newtons?
24. 24.⚖️ Along a straight bar, measured from the left end, the effort is at 40 cm, the fulcrum at 80 cm and the load at 10 cm. Which class of lever is it? (a) class 1 (b) class 2 (c) class 3
25. 25.💪 A bag has a mass of 18 kg. Taking 1 kg to weigh about 10 N, what is its weight in newtons?
26. 26.⚖️ A lever bar balances. The load is 1000 N at 30 cm from the fulcrum. The effort is 300 N at ? cm from the fulcrum on the other side. What is the missing distance in centimetres?
27. 27.🛞 More or less friction: a tyre with deep treads? (a) less friction (b) more friction
28. 28.⚖️ A seesaw balances. Asha (570 N) sits 1 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?
29. 29.💪 In which unit do we measure force? (a) second (s) (b) litre (L) (c) newton (N) (d) metre (m)
30. 30.🏋️ A machine lifts a load of 180 N when you push with 30 N. What is its mechanical advantage (MA)?
31. 31.Which of these is caused by muscular force? (a) a magnet picks up pins (b) an apple falls down (c) a river flows downhill (d) squeezing a lemon
32. 32.True or false: a pair of kitchen tongs is a class 1 lever (fulcrum in the middle). (a) True (b) False
33. 33.⚖️ A seesaw balances. Asha (560 N) sits 3 m from the pivot on one side; Arjun (? N) sits 4 m from the pivot on the other side. What is the missing weight in newtons?
34. 34.💪 A box weighs 570 N. Taking 1 kg to weigh about 10 N, what is its mass in kilograms?
35. 35.⚙️ Most simple machines make work easier by letting us … (a) switch off gravity (b) use a smaller force (c) make new energy (d) stop all friction
36. 36.⚖️ A lever bar balances. The load is 630 N at 10 cm from the fulcrum. The effort is 70 N at ? cm from the fulcrum on the other side. What is the missing distance in centimetres?
37. 37.🏋️ Work is done when a force moves something … (a) through a distance (b) very slowly (c) only upwards (d) without moving it
38. 38.⚖️ A seesaw balances. Kabir (260 N) sits ? m from the pivot on one side; Ravi (260 N) sits 2 m from the pivot on the other side. What is the missing distance in metres?
39. 39.🛞 Is friction helpful or a problem here: shoe soles wearing out? (a) helpful (b) a problem
40. 40.🪝 A winch has a wheel of radius 8 cm and an axle of radius 2 cm. What effort on the wheel lifts a 600 N bucket on the axle, in newtons? (ideal)

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