Engineering Worksheet: Part 2 Test

Engineering lesson 16: Part 2 test: forces and machines · Set 468 · 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.⚖️ Along a straight bar, measured from the left end, the effort is at 10 cm, the fulcrum at 60 cm and the load at 40 cm. Which class of lever is it? (a) class 3 (b) class 1 (c) class 2
2. 2.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 10 N, ice 1 N, a glass sheet 3 N, a wooden plank 6 N. Which surface gave the most friction? (a) a wooden plank (b) a glass sheet (c) ice (d) sandpaper
3. 3.⚖️ Turning effect = force × … (a) mass of fulcrum (b) distance from fulcrum (c) time taken (d) colour of bar
4. 4.True or false: a playground slide is an inclined plane. (a) False (b) True
5. 5.⚙️ Most simple machines make work easier by letting us … (a) use a smaller force (b) make new energy (c) switch off gravity (d) stop all friction
6. 6.💪 A box weighs 280 N. Taking 1 kg to weigh about 10 N, what is its mass in kilograms?
7. 7.🪝 More rope sections holding a load means … (a) less effort needed (b) no change (c) the load floats (d) more effort needed
8. 8.🪝 A well winch has a handle (wheel) of radius 18 cm turning an axle of radius 3 cm. What is its mechanical advantage (MA)?
9. 9.🔍 Which is the odd one out? (a) a smooth steel slide (b) a wet tiled floor (c) oil on a squeaky hinge (d) a tyre with deep treads
10. 10.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 4 N, a wooden plank 5 N, a carpet 9 N, sandpaper 10 N. How many newtons more were needed on sandpaper than on a glass sheet?
11. 11.True or false: a fixed pulley needs effort = load. (a) True (b) False
12. 12.⚖️ A lever bar balances. The load is 350 N at ? cm from the fulcrum. The effort is 70 N at 50 cm from the fulcrum on the other side. What is the missing distance in centimetres?
13. 13.🪝 A load of 690 N hangs from a pulley system in which 3 rope sections hold up the load. What effort is needed, in newtons? (ideal pulleys)
14. 14.🛞 Rubbing your hands fast makes them … (a) wet (b) magnetic (c) warm (d) cold
15. 15.⚙️ Which simple machine is a flagpole rope wheel? (a) wedge (b) pulley (c) inclined plane (d) screw
16. 16.🪝 A pulley system lifts an 840 N load with an effort of 280 N. What is its mechanical advantage (MA)?
17. 17.⚖️ A lever balances when … (a) turning effects match (b) both weights are equal (c) the bar is short (d) the fulcrum moves
18. 18.⚖️ A seesaw balances. Zoya (640 N) sits 4 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?
19. 19.🪝 A pulley system lifts a 120 N load with an effort of 30 N. What is its mechanical advantage (MA)?
20. 20.True or false: a movable pulley halves the effort. (a) False (b) True
21. 21.🔍 Which is the odd one out? (a) a wood screw (b) a nut and bolt (c) an axe blade (d) a jar lid
22. 22.💪 Is plucking a mango a push or a pull? (a) a pull (b) a push
23. 23.True or false: a fixed pulley makes you pull 2× rope. (a) True (b) False
24. 24.⚖️ A seesaw balances. Zoya (800 N) sits 2 m from the pivot on one side; Ravi (400 N) sits ? m from the pivot on the other side. What is the missing distance in metres?
25. 25.⚖️ On a seesaw, a heavier child should sit … (a) closer to the pivot (b) farther from the pivot (c) anywhere (d) on the pivot
26. 26.🏋️ A machine lifts a load of 150 N when you push with 50 N. What is its mechanical advantage (MA)?
27. 27.⚖️ Going along a lever from one end to the other, the order is: fulcrum, effort, load. Which class of lever is it? (a) class 2 (b) class 3 (c) class 1
28. 28.🪝 A winch has a wheel of radius 3 cm and an axle of radius 1 cm. What effort on the wheel lifts a 210 N bucket on the axle, in newtons? (ideal)
29. 29.🏋️ Pushing a crate 8 m took 1520 J of work. What force was used, in newtons?
30. 30.🛞 More or less friction: skating on ice? (a) less friction (b) more friction
31. 31.Which of these is a wedge? (a) a nut and bolt (b) a crowbar (c) a knife edge (d) a steering wheel
32. 32.⚖️ Which class of lever is a beam balance? (a) class 2 (b) class 1 (c) class 3
33. 33.🪝 Fixed or movable pulley: which one halves the effort? (a) a movable pulley (b) a fixed pulley
34. 34.⚙️ A screw is really … (a) a bent lever (b) a kind of wheel (c) a tiny pulley (d) a ramp wrapped round
35. 35.💪 In a tug of war, one team pulls left with 60 N and the other pulls right with 20 N. What is the size of the net force, in newtons?
36. 36.💪 A cart is pulled to the right with 30 N and to the left with 20 N. Which way does the net force act? (a) to the left (b) no net force (c) to the right
37. 37.⚖️ Along a straight bar, measured from the left end, the effort is at 0 cm, the fulcrum at 40 cm and the load at 60 cm. Which class of lever is it? (a) class 2 (b) class 3 (c) class 1
38. 38.True or false: skating on ice gives less friction. (a) True (b) False
39. 39.⚖️ Along a straight bar, measured from the left end, the effort is at 50 cm, the fulcrum at 90 cm and the load at 20 cm. Which class of lever is it? (a) class 3 (b) class 1 (c) class 2
40. 40.🔍 Which is the odd one out? (a) a claw hammer on a nail (b) a round doorknob (c) a steering wheel (d) a well winch handle

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