Engineering Worksheet: Part 2 Test

Engineering lesson 16: Part 2 test: forces and machines · Set 163 · 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 seesaw balances. Ravi (440 N) sits 2 m from the pivot on one side; Zoya (220 N) sits ? m from the pivot on the other side. What is the missing distance in metres?
2. 2.🏋️ Pushing a crate 6 m took 720 J of work. What force was used, in newtons?
3. 3.⚖️ Along a straight bar, measured from the left end, the effort is at 100 cm, the fulcrum at 20 cm and the load at 60 cm. Which class of lever is it? (a) class 1 (b) class 2 (c) class 3
4. 4.💪 A box weighs 320 N. Taking 1 kg to weigh about 10 N, what is its mass in kilograms?
5. 5.Which of these is an inclined plane? (a) a water tap handle (b) a round doorknob (c) a road up a hill (d) a nut and bolt
6. 6.🏋️ A smooth ramp is 8 m long and rises 2 m. What effort pushes a 1600 N box up it, in newtons? (ideal ramp, no friction)
7. 7.💪 Which force is at work: a river flows downhill? (a) muscular force (b) friction (c) magnetic force (d) gravity
8. 8.🪝 A well winch has a handle (wheel) of radius 4 cm turning an axle of radius 1 cm. What is its mechanical advantage (MA)?
9. 9.⚖️ A seesaw balances. Meena (170 N) sits ? m from the pivot on one side; Zoya (170 N) sits 1 m from the pivot on the other side. What is the missing distance in metres?
10. 10.True or false: a nutcracker is a class 2 lever (load in the middle). (a) True (b) False
11. 11.⚖️ A lever bar balances. The load is ? N at 30 cm from the fulcrum. The effort is 150 N at 100 cm from the fulcrum on the other side. What is the missing force in newtons?
12. 12.💪 Which can a force NOT do? (a) change its shape (b) change its colour (c) start it moving (d) stop it moving
13. 13.⚖️ A lever bar balances. The load is 600 N at ? cm from the fulcrum. The effort is 180 N at 100 cm from the fulcrum on the other side. What is the missing distance in centimetres?
14. 14.🏋️ A force of 80 N pushes a cart 1 m along the floor. How much work is done, in joules?
15. 15.🛞 Is friction helpful or a problem here: a door hinge squeaking? (a) a problem (b) helpful
16. 16.⚖️ Along a straight bar, measured from the left end, the effort is at 20 cm, the fulcrum at 10 cm and the load at 0 cm. Which class of lever is it? (a) class 3 (b) class 1 (c) class 2
17. 17.⚖️ Turning effect = force × … (a) time taken (b) colour of bar (c) distance from fulcrum (d) mass of fulcrum
18. 18.True or false: skating on ice gives less friction. (a) True (b) False
19. 19.⚙️ Which simple machine is a crane hook block? (a) wedge (b) lever (c) pulley (d) wheel and axle
20. 20.💪 In a tug of war, one team pulls right with 85 N and the other pulls left with 25 N. What is the size of the net force, in newtons?
21. 21.⚖️ Which class of lever is a broom when sweeping? (a) class 1 (b) class 2 (c) class 3
22. 22.🏋️ A force of 440 N did 880 J of work. How many metres did the object move?
23. 23.🔍 Which is the odd one out? (a) a steering wheel (b) an axe blade (c) a water tap handle (d) a round doorknob
24. 24.💪 Which force is at work: a rolling ball slows? (a) friction (b) gravity (c) magnetic force (d) muscular force
25. 25.True or false: a round doorknob is a pulley. (a) True (b) False
26. 26.🪝 Fixed or movable pulley: which one rises with the load? (a) a movable pulley (b) a fixed pulley
27. 27.True or false: a flagpole rope wheel is a pulley. (a) False (b) True
28. 28.🪝 A winch has a wheel of radius 40 cm and an axle of radius 5 cm. What effort on the wheel lifts a 560 N bucket on the axle, in newtons? (ideal)
29. 29.🏋️ A force of 120 N pushes a cart 10 m along the floor. How much work is done, in joules?
30. 30.⚙️ How many simple machines are there in the usual list? (a) 6 (b) 12 (c) 10 (d) 3
31. 31.🪝 A load of 840 N hangs from a pulley system in which 4 rope sections hold up the load. What effort is needed, in newtons? (ideal pulleys)
32. 32.⚖️ On a seesaw, a heavier child should sit … (a) farther from the pivot (b) on the pivot (c) closer to the pivot (d) anywhere
33. 33.⚖️ A lever bar balances. The load is 100 N at ? cm from the fulcrum. The effort is 50 N at 100 cm from the fulcrum on the other side. What is the missing distance in centimetres?
34. 34.🏋️ In which unit is work measured? (a) newton (N) (b) metre (m) (c) joule (J) (d) watt hour
35. 35.🏋️ A force of 180 N did 180 J of work. How many metres did the object move?
36. 36.💪 A force is a … (a) push or a pull (b) type of sound (c) kind of colour (d) unit of time
37. 37.⚖️ A seesaw balances. Ravi (? N) sits 3 m from the pivot on one side; Kabir (480 N) sits 4 m from the pivot on the other side. What is the missing weight in newtons?
38. 38.⚖️ A seesaw balances. Kabir (? N) sits 1 m from the pivot on one side; Ravi (160 N) sits 1 m from the pivot on the other side. What is the missing weight in newtons?
39. 39.Which of these is a lever? (a) a bottle cap (b) a round doorknob (c) a claw hammer on a nail (d) an axe blade
40. 40.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 10 N, ice 1 N, a wooden plank 3 N, a carpet 7 N. Which surface gave the most friction? (a) sandpaper (b) a wooden plank (c) a carpet (d) ice

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