Engineering Worksheet: Part 2 Test

Engineering lesson 16: Part 2 test: forces and machines · Set 148 · 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 30 cm from the fulcrum. The effort is 60 N at 40 cm from the fulcrum on the other side. What is the missing force in newtons?
2. 2.⚖️ A lever bar balances. The load is ? N at 10 cm from the fulcrum. The effort is 60 N at 40 cm from the fulcrum on the other side. What is the missing force in newtons?
3. 3.💪 Which force is at work: a compass needle turns? (a) gravity (b) muscular force (c) magnetic force (d) friction
4. 4.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 8 N, sandpaper 10 N, ice 3 N, a wooden plank 6 N. Which surface gave the most friction? (a) a carpet (b) ice (c) sandpaper (d) a wooden plank
5. 5.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 2 N, a glass sheet 4 N, a wooden plank 5 N, a carpet 9 N. Which surface gave the most friction? (a) a wooden plank (b) a glass sheet (c) ice (d) a carpet
6. 6.💪 A bag has a mass of 48 kg. Taking 1 kg to weigh about 10 N, what is its weight in newtons?
7. 7.💪 Which force is at work: rain falls to the ground? (a) friction (b) magnetic force (c) gravity (d) muscular force
8. 8.⚖️ A seesaw balances. Meena (680 N) sits ? m from the pivot on one side; Asha (340 N) sits 4 m from the pivot on the other side. What is the missing distance in metres?
9. 9.True or false: a claw hammer on a nail is a lever. (a) True (b) False
10. 10.🪝 A pulley system has 3 rope sections holding up the load. To lift the load by 10 m, how many metres of rope must you pull?
11. 11.⚖️ Going along a lever from one end to the other, the order is: effort, fulcrum, load. Which class of lever is it? (a) class 2 (b) class 1 (c) class 3
12. 12.🏋️ A 14 kg box is lifted straight up by 3 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
13. 13.💪 Which force is at work: a fridge magnet sticks? (a) gravity (b) friction (c) muscular force (d) magnetic force
14. 14.🏋️ A force of 40 N did 160 J of work. How many metres did the object move?
15. 15.🛞 Is friction helpful or a problem here: shoe soles wearing out? (a) helpful (b) a problem
16. 16.⚖️ A lever bar balances. The load is 810 N at ? cm from the fulcrum. The effort is 450 N at 90 cm from the fulcrum on the other side. What is the missing distance in centimetres?
17. 17.🏋️ Mechanical advantage (MA) = … (a) load ÷ effort (b) load × effort (c) effort ÷ load (d) load + effort
18. 18.🏋️ A force of 360 N did 2160 J of work. How many metres did the object move?
19. 19.🔍 Which is the odd one out? (a) a grippy rubber sole (b) oil on a squeaky hinge (c) a wheel on ball bearings (d) a wet tiled floor
20. 20.⚖️ Going along a lever from one end to the other, the order is: load, fulcrum, effort. Which class of lever is it? (a) class 2 (b) class 3 (c) class 1
21. 21.💪 A box weighs 70 N. Taking 1 kg to weigh about 10 N, what is its mass in kilograms?
22. 22.⚖️ In a class 2 lever, what is in the middle? (a) the load (b) the axle (c) the fulcrum (d) the effort
23. 23.True or false: pulling up your socks is a pull. (a) True (b) False
24. 24.Which of these is caused by friction? (a) brakes stop a bicycle (b) a thrown ball comes down (c) pedalling a cycle (d) a compass needle turns
25. 25.⚖️ Turning effect = force × … (a) time taken (b) colour of bar (c) mass of fulcrum (d) distance from fulcrum
26. 26.💪 Which force is at work: pedalling a cycle? (a) gravity (b) muscular force (c) friction (d) magnetic force
27. 27.🏋️ A 20 kg box is lifted straight up by 2 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
28. 28.⚖️ Along a straight bar, measured from the left end, the effort is at 50 cm, the fulcrum at 60 cm and the load at 10 cm. Which class of lever is it? (a) class 1 (b) class 3 (c) class 2
29. 29.🛞 More or less friction: chalk on a gym bar? (a) less friction (b) more friction
30. 30.⚙️ Which simple machine is a well-bucket rope wheel? (a) pulley (b) screw (c) inclined plane (d) lever
31. 31.💪 In which unit do we measure force? (a) newton (N) (b) second (s) (c) metre (m) (d) litre (L)
32. 32.🛞 Rubbing your hands fast makes them … (a) wet (b) warm (c) magnetic (d) cold
33. 33.⚖️ A seesaw balances. Meena (380 N) sits ? m from the pivot on one side; Asha (190 N) sits 2 m from the pivot on the other side. What is the missing distance in metres?
34. 34.⚖️ A seesaw balances. Arjun (? N) sits 2 m from the pivot on one side; Asha (340 N) sits 1 m from the pivot on the other side. What is the missing weight in newtons?
35. 35.💪 In a tug of war, one team pulls right with 95 N and the other pulls left with 20 N. What is the size of the net force, in newtons?
36. 36.⚖️ A seesaw balances. Ravi (110 N) sits ? m from the pivot on one side; Arjun (110 N) sits 1 m from the pivot on the other side. What is the missing distance in metres?
37. 37.⚖️ Which class of lever is a fishing rod? (a) class 2 (b) class 3 (c) class 1
38. 38.⚖️ A seesaw balances. Kabir (110 N) sits 4 m from the pivot on one side; Meena (? N) sits 1 m from the pivot on the other side. What is the missing weight in newtons?
39. 39.⚖️ A seesaw balances. Arjun (340 N) sits ? m from the pivot on one side; Ravi (680 N) sits 2 m from the pivot on the other side. What is the missing distance in metres?
40. 40.True or false: a nut and bolt is a lever. (a) False (b) True

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