Engineering Worksheet: Part 2 Test

Engineering lesson 16: Part 2 test: forces and machines · Set 300 · 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.⚖️ Which class of lever is your forearm? (a) class 2 (b) class 1 (c) class 3
2. 2.⚖️ A seesaw balances. Kabir (? N) sits 1 m from the pivot on one side; Asha (190 N) sits 2 m from the pivot on the other side. What is the missing weight in newtons?
3. 3.⚖️ In a class 2 lever, what is in the middle? (a) the fulcrum (b) the axle (c) the load (d) the effort
4. 4.🪝 Fixed or movable pulley: which one hangs on the rope loop? (a) a movable pulley (b) a fixed pulley
5. 5.🏋️ Mechanical advantage (MA) = … (a) effort ÷ load (b) load × effort (c) load + effort (d) load ÷ effort
6. 6.True or false: a movable pulley rises with the load. (a) True (b) False
7. 7.🛞 Is friction helpful or a problem here: shoe soles wearing out? (a) helpful (b) a problem
8. 8.🪝 A wheel and axle is a big wheel fixed to … (a) a loose rope (b) a smaller rod (axle) (c) a sharp wedge (d) a flat ramp
9. 9.🪝 A pulley system has 1 rope section holding up the load. To lift the load by 7 m, how many metres of rope must you pull?
10. 10.⚖️ Which class of lever is a seesaw? (a) class 2 (b) class 3 (c) class 1
11. 11.💪 Is opening a drawer a push or a pull? (a) a pull (b) a push
12. 12.💪 Is a tug of war a push or a pull? (a) a pull (b) a push
13. 13.🏋️ Pushing a crate 8 m took 1440 J of work. What force was used, in newtons?
14. 14.Which of these is caused by gravity? (a) lifting a school bag (b) shoes grip the floor (c) pedalling a cycle (d) an apple falls down
15. 15.💪 Which force is at work: brakes stop a bicycle? (a) magnetic force (b) muscular force (c) friction (d) gravity
16. 16.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 4 N, sandpaper 5 N, ice 2 N, a glass sheet 3 N. Which surface gave the least friction? (a) ice (b) sandpaper (c) a glass sheet (d) a wooden plank
17. 17.🛞 Rubbing your hands fast makes them … (a) wet (b) cold (c) magnetic (d) warm
18. 18.⚙️ Which simple machine is a road up a hill? (a) wheel and axle (b) inclined plane (c) pulley (d) screw
19. 19.True or false: a pair of scissors is a class 2 lever (load in the middle). (a) False (b) True
20. 20.⚖️ A lever bar balances. The load is 60 N at ? cm from the fulcrum. The effort is 80 N at 30 cm from the fulcrum on the other side. What is the missing distance in centimetres?
21. 21.⚖️ A lever bar balances. The load is ? N at 20 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?
22. 22.🛞 Is friction helpful or a problem here: gripping a cricket bat? (a) helpful (b) a problem
23. 23.⚖️ A lever bar balances. The load is ? N at 50 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?
24. 24.⚖️ Along a straight bar, measured from the left end, the effort is at 30 cm, the fulcrum at 100 cm and the load at 60 cm. Which class of lever is it? (a) class 1 (b) class 2 (c) class 3
25. 25.🪝 A bucket weighing 80 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 force of 70 N did 700 J of work. How many metres did the object move?
27. 27.⚖️ Turning effect = force × … (a) distance from fulcrum (b) time taken (c) mass of fulcrum (d) colour of bar
28. 28.True or false: plucking a mango is a push. (a) True (b) False
29. 29.True or false: powder on a carrom board gives less friction. (a) True (b) False
30. 30.⚙️ A wedge is … (a) a rope on a wheel (b) two ramps back to back (c) a wheel on a rod (d) a bar on a pivot
31. 31.🪝 A load of 540 N hangs from a pulley system in which 3 rope sections hold up the load. What effort is needed, in newtons? (ideal pulleys)
32. 32.⚙️ Which simple machine is a nutcracker? (a) wedge (b) lever (c) inclined plane (d) screw
33. 33.⚖️ A seesaw balances. Arjun (? N) sits 4 m from the pivot on one side; Kabir (400 N) sits 4 m from the pivot on the other side. What is the missing weight in newtons?
34. 34.True or false: a pair of pliers is a class 3 lever (effort in the middle). (a) False (b) True
35. 35.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 13 N, ice 4 N, a glass sheet 6 N, a wooden plank 10 N. Which surface gave the least friction? (a) a glass sheet (b) sandpaper (c) ice (d) a wooden plank
36. 36.True or false: oil on a squeaky hinge gives more friction. (a) False (b) True
37. 37.🔍 Which is the odd one out? (a) a wheelchair ramp (b) a playground slide (c) a truck loading ramp (d) a jar lid
38. 38.🪝 A load of 240 N hangs from a pulley system in which 3 rope sections hold up the load. What effort is needed, in newtons? (ideal pulleys)
39. 39.True or false: a crowbar is a class 3 lever (effort in the middle). (a) False (b) True
40. 40.🔍 Which is the odd one out? (a) a smooth steel slide (b) a wheel on ball bearings (c) powder on a carrom board (d) chalk on a gym bar

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