Engineering Worksheet: Part 2 Test

Engineering lesson 16: Part 2 test: forces and machines · Set 242 · 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 lever bar balances. The load is 210 N at 40 cm from the fulcrum. The effort is ? N at 30 cm from the fulcrum on the other side. What is the missing force in newtons?
2. 2.💪 A box weighs 130 N. Taking 1 kg to weigh about 10 N, what is its mass in kilograms?
3. 3.💪 A box weighs 120 N. Taking 1 kg to weigh about 10 N, what is its mass in kilograms?
4. 4.True or false: a wood screw is a screw. (a) False (b) True
5. 5.💪 A bag has a mass of 24 kg. Taking 1 kg to weigh about 10 N, what is its weight in newtons?
6. 6.🛞 More or less friction: a wheel on ball bearings? (a) more friction (b) less friction
7. 7.💪 Is closing a drawer a push or a pull? (a) a pull (b) a push
8. 8.🏋️ A longer ramp to the same height needs … (a) more effort (b) no effort (c) the same effort (d) less effort
9. 9.💪 In a tug of war, one team pulls left with 35 N and the other pulls right with 10 N. What is the size of the net force, in newtons?
10. 10.⚖️ Along a straight bar, measured from the left end, the effort is at 60 cm, the fulcrum at 20 cm and the load at 80 cm. Which class of lever is it? (a) class 1 (b) class 3 (c) class 2
11. 11.True or false: a movable pulley is on a flagpole top. (a) True (b) False
12. 12.🪝 A pulley system lifts a 960 N load with an effort of 240 N. What is its mechanical advantage (MA)?
13. 13.💪 A box weighs 460 N. Taking 1 kg to weigh about 10 N, what is its mass in kilograms?
14. 14.🔍 Which is the odd one out? (a) a road up a hill (b) a playground slide (c) a wheelchair ramp (d) a round doorknob
15. 15.💪 Which force is at work: brakes stop a bicycle? (a) muscular force (b) magnetic force (c) gravity (d) friction
16. 16.True or false: powder on a carrom board gives less friction. (a) False (b) True
17. 17.⚖️ Going along a lever from one end to the other, the order is: fulcrum, load, effort. Which class of lever is it? (a) class 1 (b) class 2 (c) class 3
18. 18.🏋️ A force of 50 N pushes a cart 8 m along the floor. How much work is done, in joules?
19. 19.⚖️ A lever bar balances. The load is ? N at 30 cm from the fulcrum. The effort is 210 N at 20 cm from the fulcrum on the other side. What is the missing force in newtons?
20. 20.Which of these is a pulley? (a) a steering wheel (b) a bottle cap (c) a well-bucket rope wheel (d) a road up a hill
21. 21.🪝 More rope sections holding a load means … (a) less effort needed (b) more effort needed (c) no change (d) the load floats
22. 22.🏋️ A machine lifts a load of 450 N when you push with 150 N. What is its mechanical advantage (MA)?
23. 23.True or false: a movable pulley halves the effort. (a) False (b) True
24. 24.⚖️ A seesaw balances. Meena (570 N) sits 3 m from the pivot on one side; Zoya (570 N) sits ? m from the pivot on the other side. What is the missing distance in metres?
25. 25.🏋️ Mechanical advantage (MA) = … (a) load ÷ effort (b) load + effort (c) effort ÷ load (d) load × effort
26. 26.🏋️ Pushing a crate 4 m took 640 J of work. What force was used, in newtons?
27. 27.⚖️ Which class of lever is a broom when sweeping? (a) class 2 (b) class 1 (c) class 3
28. 28.⚖️ Along a straight bar, measured from the left end, the effort is at 20 cm, the fulcrum at 30 cm and the load at 40 cm. Which class of lever is it? (a) class 3 (b) class 1 (c) class 2
29. 29.🪝 Fixed or movable pulley: which one only changes direction? (a) a fixed pulley (b) a movable pulley
30. 30.⚖️ In a class 1 lever, what is in the middle? (a) the load (b) nothing (c) the fulcrum (d) the effort
31. 31.💪 A force is a … (a) type of sound (b) unit of time (c) kind of colour (d) push or a pull
32. 32.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 6 N, a wooden plank 9 N, sandpaper 10 N, ice 2 N. Which surface gave the least friction? (a) a glass sheet (b) a wooden plank (c) sandpaper (d) ice
33. 33.⚖️ A seesaw balances. Arjun (510 N) sits 2 m from the pivot on one side; Meena (? N) sits 3 m from the pivot on the other side. What is the missing weight in newtons?
34. 34.🔍 Which is the odd one out? (a) a flagpole rope wheel (b) a well-bucket rope wheel (c) a window blind cord (d) a seesaw
35. 35.🔍 Which is the odd one out? (a) oil on a squeaky hinge (b) a tyre with deep treads (c) powder on a carrom board (d) a smooth steel slide
36. 36.🪝 A bucket weighing 490 N is lifted with a single fixed pulley at the top of a well. What effort is needed, in newtons? (ideal pulley, no friction)
37. 37.True or false: pulling a cart is a pull. (a) True (b) False
38. 38.🏋️ A force of 290 N did 290 J of work. How many metres did the object move?
39. 39.🪝 A load of 150 N hangs from a pulley system in which 3 rope sections hold up the load. What effort is needed, in newtons? (ideal pulleys)
40. 40.⚖️ Which class of lever is a pair of tweezers? (a) class 3 (b) class 2 (c) class 1

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