Engineering Worksheet: Part 2 Test

Engineering lesson 16: Part 2 test: forces and machines · Set 691 · 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 smooth ramp is 12 m long and rises 3 m. What effort pushes a 1400 N box up it, in newtons? (ideal ramp, no friction)
2. 2.⚙️ Which simple machine is a wood screw? (a) screw (b) wedge (c) inclined plane (d) lever
3. 3.⚖️ In a class 3 lever, what is in the middle? (a) the pulley (b) the fulcrum (c) the load (d) the effort
4. 4.🪝 A pulley system lifts a 160 N load with an effort of 80 N. What is its mechanical advantage (MA)?
5. 5.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 7 N, a carpet 9 N, sandpaper 13 N, ice 3 N. Which surface gave the most friction? (a) a glass sheet (b) sandpaper (c) ice (d) a carpet
6. 6.⚖️ A seesaw balances. Asha (600 N) sits 2 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?
7. 7.🛞 Is friction helpful or a problem here: brakes stopping a cycle? (a) a problem (b) helpful
8. 8.⚖️ Along a straight bar, measured from the left end, the effort is at 30 cm, the fulcrum at 50 cm and the load at 40 cm. Which class of lever is it? (a) class 3 (b) class 2 (c) class 1
9. 9.🛞 Is friction helpful or a problem here: a door hinge squeaking? (a) helpful (b) a problem
10. 10.⚖️ Turning effect = force × … (a) mass of fulcrum (b) time taken (c) colour of bar (d) distance from fulcrum
11. 11.🪝 A winch has a wheel of radius 24 cm and an axle of radius 4 cm. What effort on the wheel lifts a 600 N bucket on the axle, in newtons? (ideal)
12. 12.⚙️ A wedge is … (a) a rope on a wheel (b) a wheel on a rod (c) a bar on a pivot (d) two ramps back to back
13. 13.⚖️ On a seesaw, a heavier child should sit … (a) farther from the pivot (b) closer to the pivot (c) on the pivot (d) anywhere
14. 14.⚖️ In a class 2 lever, what is in the middle? (a) the effort (b) the axle (c) the fulcrum (d) the load
15. 15.🏋️ A smooth ramp is 18 m long and rises 3 m. What effort pushes a 6000 N box up it, in newtons? (ideal ramp, no friction)
16. 16.Which of these is caused by gravity? (a) squeezing a lemon (b) pedalling a cycle (c) a thrown ball comes down (d) brakes stop a bicycle
17. 17.True or false: a window blind cord is a wedge. (a) True (b) False
18. 18.⚙️ Which simple machine is a claw hammer on a nail? (a) inclined plane (b) lever (c) wedge (d) screw
19. 19.💪 In a tug of war, one team pulls right with 25 N and the other pulls left with 5 N. What is the size of the net force, in newtons?
20. 20.🏋️ Mechanical advantage (MA) = … (a) load ÷ effort (b) effort ÷ load (c) load + effort (d) load × effort
21. 21.⚙️ Which simple machine is a flagpole rope wheel? (a) lever (b) inclined plane (c) screw (d) pulley
22. 22.🪝 A wheel and axle is a big wheel fixed to … (a) a flat ramp (b) a loose rope (c) a sharp wedge (d) a smaller rod (axle)
23. 23.🛞 More or less friction: oil on a squeaky hinge? (a) more friction (b) less friction
24. 24.🪝 Fixed or movable pulley: which one needs effort = load? (a) a fixed pulley (b) a movable pulley
25. 25.Which of these is caused by magnetic force? (a) a magnet picks up pins (b) pedalling a cycle (c) squeezing a lemon (d) an apple falls down
26. 26.🛞 Is friction helpful or a problem here: dragging a heavy box? (a) a problem (b) helpful
27. 27.True or false: pulling a cart is a pull. (a) True (b) False
28. 28.🏋️ Pushing a crate 3 m took 540 J of work. What force was used, in newtons?
29. 29.💪 A force is a … (a) kind of colour (b) push or a pull (c) unit of time (d) type of sound
30. 30.True or false: a tug of war is a push. (a) True (b) False
31. 31.🪝 A bucket weighing 220 N is lifted with a single fixed pulley at the top of a well. What effort is needed, in newtons? (ideal pulley, no friction)
32. 32.💪 A bag has a mass of 6 kg. Taking 1 kg to weigh about 10 N, what is its weight in newtons?
33. 33.⚙️ Which simple machine is a road up a hill? (a) pulley (b) lever (c) wedge (d) inclined plane
34. 34.True or false: a rough doormat gives more friction. (a) False (b) True
35. 35.⚖️ A seesaw balances. Meena (? N) sits 1 m from the pivot on one side; Arjun (120 N) sits 3 m from the pivot on the other side. What is the missing weight in newtons?
36. 36.⚖️ A lever bar balances. The load is ? N at 20 cm from the fulcrum. The effort is 100 N at 50 cm from the fulcrum on the other side. What is the missing force in newtons?
37. 37.⚖️ A seesaw balances. Kabir (260 N) sits 4 m from the pivot on one side; Ravi (520 N) sits ? m from the pivot on the other side. What is the missing distance in metres?
38. 38.True or false: a wheelbarrow is a class 2 lever (load in the middle). (a) True (b) False
39. 39.⚖️ Which class of lever is a broom when sweeping? (a) class 1 (b) class 2 (c) class 3
40. 40.🏋️ Pushing a crate 10 m took 200 J of work. What force was used, in newtons?

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