Engineering Worksheet: Part 2 Test

Engineering lesson 16: Part 2 test: forces and machines · Set 170 · 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.True or false: a crowbar is a class 1 lever (fulcrum in the middle). (a) False (b) True
2. 2.⚖️ Along a straight bar, measured from the left end, the effort is at 30 cm, the fulcrum at 60 cm and the load at 90 cm. Which class of lever is it? (a) class 2 (b) class 1 (c) class 3
3. 3.⚖️ A seesaw balances. Meena (140 N) sits 4 m from the pivot on one side; Ravi (560 N) sits ? m from the pivot on the other side. What is the missing distance in metres?
4. 4.🛞 More or less friction: a box pushed on carpet? (a) more friction (b) less friction
5. 5.💪 Is closing a drawer a push or a pull? (a) a push (b) a pull
6. 6.⚖️ Which class of lever is a pair of kitchen tongs? (a) class 1 (b) class 3 (c) class 2
7. 7.💪 Which force is at work: a river flows downhill? (a) muscular force (b) gravity (c) friction (d) magnetic force
8. 8.⚖️ A lever balances when … (a) turning effects match (b) the fulcrum moves (c) both weights are equal (d) the bar is short
9. 9.⚖️ Along a straight bar, measured from the left end, the effort is at 0 cm, the fulcrum at 30 cm and the load at 70 cm. Which class of lever is it? (a) class 1 (b) class 3 (c) class 2
10. 10.True or false: a movable pulley hangs on the rope loop. (a) True (b) False
11. 11.🏋️ A force of 150 N pushes a cart 2 m along the floor. How much work is done, in joules?
12. 12.⚖️ A seesaw balances. Zoya (? N) sits 1 m from the pivot on one side; Arjun (170 N) sits 3 m from the pivot on the other side. What is the missing weight in newtons?
13. 13.⚖️ Going along a lever from one end to the other, the order is: load, effort, fulcrum. Which class of lever is it? (a) class 3 (b) class 1 (c) class 2
14. 14.⚖️ A seesaw balances. Asha (260 N) sits 4 m from the pivot on one side; Meena (? N) sits 2 m from the pivot on the other side. What is the missing weight in newtons?
15. 15.🛞 Friction acts … (a) only on ice (b) only upwards (c) against the motion (d) with the motion
16. 16.⚙️ Which simple machine is a steering wheel? (a) inclined plane (b) wheel and axle (c) lever (d) screw
17. 17.🪝 A winch has a wheel of radius 21 cm and an axle of radius 3 cm. What effort on the wheel lifts a 910 N bucket on the axle, in newtons? (ideal)
18. 18.🪝 A well winch has a handle (wheel) of radius 10 cm turning an axle of radius 2 cm. What is its mechanical advantage (MA)?
19. 19.True or false: pulling a cart is a push. (a) False (b) True
20. 20.🏋️ A smooth ramp is 5 m long and rises 1 m. What effort pushes a 3000 N box up it, in newtons? (ideal ramp, no friction)
21. 21.🏋️ A smooth ramp is 12 m long and rises 2 m. What effort pushes a 300 N box up it, in newtons? (ideal ramp, no friction)
22. 22.🛞 More or less friction: sand on a slippery path? (a) more friction (b) less friction
23. 23.True or false: a fixed pulley only changes direction. (a) True (b) False
24. 24.🏋️ A force of 410 N did 410 J of work. How many metres did the object move?
25. 25.⚖️ Turning effect = force × … (a) mass of fulcrum (b) colour of bar (c) time taken (d) distance from fulcrum
26. 26.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 9 N, ice 2 N, a glass sheet 4 N, a carpet 8 N. Which surface gave the least friction? (a) ice (b) sandpaper (c) a glass sheet (d) a carpet
27. 27.🏋️ A machine lifts a load of 200 N when you push with 40 N. What is its mechanical advantage (MA)?
28. 28.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 5 N, a carpet 6 N, sandpaper 9 N, a glass sheet 4 N. Which surface gave the least friction? (a) a carpet (b) a glass sheet (c) sandpaper (d) a wooden plank
29. 29.True or false: opening a drawer is a pull. (a) True (b) False
30. 30.🪝 More rope sections holding a load means … (a) less effort needed (b) the load floats (c) more effort needed (d) no change
31. 31.🛞 Is friction helpful or a problem here: walking without slipping? (a) helpful (b) a problem
32. 32.⚖️ In a class 3 lever, what is in the middle? (a) the fulcrum (b) the effort (c) the pulley (d) the load
33. 33.True or false: a wheel on ball bearings gives more friction. (a) False (b) True
34. 34.⚖️ A lever bar balances. The load is ? N at 30 cm from the fulcrum. The effort is 240 N at 40 cm from the fulcrum on the other side. What is the missing force in newtons?
35. 35.🏋️ A force of 50 N did 50 J of work. How many metres did the object move?
36. 36.True or false: a crane hook block is a pulley. (a) False (b) True
37. 37.Which of these is caused by friction? (a) an apple falls down (b) a compass needle turns (c) a rolling ball slows (d) squeezing a lemon
38. 38.Which of these is a screw? (a) a jar lid (b) a window blind cord (c) a truck loading ramp (d) a bottle opener
39. 39.True or false: a grippy rubber sole gives less friction. (a) False (b) True
40. 40.⚖️ A seesaw balances. Ravi (570 N) sits ? m from the pivot on one side; Arjun (190 N) sits 3 m from the pivot on the other side. What is the missing distance in metres?

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