Engineering Worksheet: Part 2 Test

Engineering lesson 16: Part 2 test: forces and machines · Set 533 · 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.💪 Two equal forces push on a box from opposite sides. They are … (a) gravity (b) doubled (c) unbalanced (d) balanced
2. 2.Which of these is a pulley? (a) a nutcracker (b) a playground slide (c) a nut and bolt (d) a flagpole rope wheel
3. 3.🪝 A bucket weighing 330 N is lifted with a single fixed pulley at the top of a well. What effort is needed, in newtons? (ideal pulley, no friction)
4. 4.True or false: a crane hook block is a pulley. (a) True (b) False
5. 5.⚙️ Which simple machine is a steering wheel? (a) screw (b) pulley (c) inclined plane (d) wheel and axle
6. 6.🪝 A pulley system has 4 rope sections holding up the load. To lift the load by 4 m, how many metres of rope must you pull?
7. 7.🛞 More or less friction: sand on a slippery path? (a) less friction (b) more friction
8. 8.🏋️ A machine lifts a load of 680 N when you push with 170 N. What is its mechanical advantage (MA)?
9. 9.⚖️ A seesaw balances. Meena (150 N) sits 4 m from the pivot on one side; Zoya (600 N) sits ? m from the pivot on the other side. What is the missing distance in metres?
10. 10.🔍 Which is the odd one out? (a) a round doorknob (b) a road up a hill (c) a wheelchair ramp (d) a truck loading ramp
11. 11.⚖️ In a class 2 lever, what is in the middle? (a) the axle (b) the load (c) the effort (d) the fulcrum
12. 12.🪝 Fixed or movable pulley: which one rises with the load? (a) a movable pulley (b) a fixed pulley
13. 13.🪝 A winch has a wheel of radius 3 cm and an axle of radius 1 cm. What effort on the wheel lifts a 480 N bucket on the axle, in newtons? (ideal)
14. 14.💪 A bag has a mass of 53 kg. Taking 1 kg to weigh about 10 N, what is its weight in newtons?
15. 15.True or false: a fixed pulley hangs on the rope loop. (a) True (b) False
16. 16.True or false: a beam balance is a class 1 lever (fulcrum in the middle). (a) False (b) True
17. 17.🪝 A well winch has a handle (wheel) of radius 8 cm turning an axle of radius 1 cm. What is its mechanical advantage (MA)?
18. 18.⚙️ 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
19. 19.⚙️ Most simple machines make work easier by letting us … (a) make new energy (b) use a smaller force (c) stop all friction (d) switch off gravity
20. 20.⚖️ Along a straight bar, measured from the left end, the effort is at 30 cm, the fulcrum at 70 cm and the load at 110 cm. Which class of lever is it? (a) class 2 (b) class 3 (c) class 1
21. 21.🏋️ A force of 260 N did 260 J of work. How many metres did the object move?
22. 22.🛞 Is friction helpful or a problem here: a knot holding a rope? (a) a problem (b) helpful
23. 23.🪝 More rope sections holding a load means … (a) more effort needed (b) the load floats (c) no change (d) less effort needed
24. 24.⚖️ Turning effect = force × … (a) time taken (b) distance from fulcrum (c) mass of fulcrum (d) colour of bar
25. 25.💪 Is closing a drawer a push or a pull? (a) a push (b) a pull
26. 26.🏋️ A force of 500 N pushes a cart 6 m along the floor. How much work is done, in joules?
27. 27.💪 In a tug of war, one team pulls right with 45 N and the other pulls left with 5 N. What is the size of the net force, in newtons?
28. 28.🪝 A winch has a wheel of radius 24 cm and an axle of radius 4 cm. What effort on the wheel lifts a 360 N bucket on the axle, in newtons? (ideal)
29. 29.⚖️ A lever bar balances. The load is 350 N at ? cm from the fulcrum. The effort is 250 N at 70 cm from the fulcrum on the other side. What is the missing distance in centimetres?
30. 30.🪝 Fixed or movable pulley: which one only changes direction? (a) a movable pulley (b) a fixed pulley
31. 31.🔍 Which is the odd one out? (a) a box pushed on carpet (b) a wheel on ball bearings (c) oil on a squeaky hinge (d) a wet tiled floor
32. 32.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 5 N, a wooden plank 8 N, sandpaper 10 N, ice 3 N. Which surface gave the most friction? (a) sandpaper (b) ice (c) a wooden plank (d) a glass sheet
33. 33.⚖️ A seesaw balances. Ravi (120 N) sits ? m from the pivot on one side; Asha (480 N) sits 1 m from the pivot on the other side. What is the missing distance in metres?
34. 34.True or false: a bottle opener is a class 3 lever (effort in the middle). (a) False (b) True
35. 35.🔍 Which is the odd one out? (a) a smooth steel slide (b) oil on a squeaky hinge (c) a rough doormat (d) skating on ice
36. 36.🏋️ Pushing a crate 2 m took 180 J of work. What force was used, in newtons?
37. 37.⚖️ A seesaw balances. Meena (200 N) sits ? m from the pivot on one side; Zoya (600 N) sits 1 m from the pivot on the other side. What is the missing distance in metres?
38. 38.True or false: powder on a carrom board gives less friction. (a) True (b) False
39. 39.🪝 Fixed or movable pulley: which one hangs on the rope loop? (a) a fixed pulley (b) a movable pulley
40. 40.⚖️ Along a straight bar, measured from the left end, the effort is at 10 cm, the fulcrum at 30 cm and the load at 0 cm. Which class of lever is it? (a) class 1 (b) class 3 (c) class 2

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