Engineering Worksheet: Part 2 Test

Engineering lesson 16: Part 2 test: forces and machines · Set 119 · 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 3 lever (effort in the middle). (a) False (b) True
2. 2.🏋️ A machine lifts a load of 140 N when you push with 70 N. What is its mechanical advantage (MA)?
3. 3.🔍 Which is the odd one out? (a) a round doorknob (b) a crowbar (c) a steering wheel (d) a water tap handle
4. 4.🏋️ Pushing a crate 7 m took 630 J of work. What force was used, in newtons?
5. 5.True or false: a movable pulley only changes direction. (a) True (b) False
6. 6.🛞 More or less friction: oil on a squeaky hinge? (a) less friction (b) more friction
7. 7.💪 In a tug of war, one team pulls right with 15 N and the other pulls left with 10 N. What is the size of the net force, in newtons?
8. 8.🪝 What does a single fixed pulley change? (a) the size of the load (b) the direction of pull (c) gravity (d) the colour of rope
9. 9.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 1 N, a glass sheet 4 N, a carpet 5 N, sandpaper 8 N. Which surface gave the most friction? (a) ice (b) a glass sheet (c) a carpet (d) sandpaper
10. 10.⚖️ A seesaw balances. Arjun (390 N) sits 1 m from the pivot on one side; Zoya (130 N) sits ? m from the pivot on the other side. What is the missing distance in metres?
11. 11.🛞 How can we reduce friction in a machine? (a) oil the moving parts (b) make parts rough (c) press parts harder (d) add sand
12. 12.True or false: a movable pulley hangs on the rope loop. (a) False (b) True
13. 13.🛞 More or less friction: sand on a slippery path? (a) less friction (b) more friction
14. 14.🏋️ A force of 120 N pushes a cart 10 m along the floor. How much work is done, in joules?
15. 15.🏋️ Can a simple machine reduce the work done? (a) only on Mondays (b) yes, by half (c) no, work stays the same (d) yes, always
16. 16.🪝 A wheel and axle is a big wheel fixed to … (a) a flat ramp (b) a loose rope (c) a smaller rod (axle) (d) a sharp wedge
17. 17.True or false: opening a drawer is a push. (a) True (b) False
18. 18.⚖️ A seesaw balances. Ravi (160 N) sits 3 m from the pivot on one side; Kabir (? N) sits 1 m from the pivot on the other side. What is the missing weight in newtons?
19. 19.🏋️ Mechanical advantage (MA) = … (a) load × effort (b) load ÷ effort (c) effort ÷ load (d) load + effort
20. 20.⚙️ Which simple machine is a screw jack? (a) pulley (b) wedge (c) lever (d) screw
21. 21.⚖️ Along a straight bar, measured from the left end, the effort is at 20 cm, the fulcrum at 60 cm and the load at 10 cm. Which class of lever is it? (a) class 2 (b) class 3 (c) class 1
22. 22.True or false: a fixed pulley stays in one place. (a) True (b) False
23. 23.⚖️ Along a straight bar, measured from the left end, the effort is at 50 cm, the fulcrum at 30 cm and the load at 60 cm. Which class of lever is it? (a) class 2 (b) class 1 (c) class 3
24. 24.🔍 Which is the odd one out? (a) a tyre with deep treads (b) a smooth steel slide (c) a rough doormat (d) a box pushed on carpet
25. 25.⚖️ Which class of lever is a pair of kitchen tongs? (a) class 3 (b) class 1 (c) class 2
26. 26.🏋️ Work is done when a force moves something … (a) without moving it (b) very slowly (c) through a distance (d) only upwards
27. 27.⚖️ On a seesaw, a heavier child should sit … (a) on the pivot (b) anywhere (c) farther from the pivot (d) closer to the pivot
28. 28.⚖️ What is the pivot point of a lever called? (a) the fulcrum (b) the axle (c) the load (d) the effort
29. 29.⚖️ A seesaw balances. Arjun (? N) sits 2 m from the pivot on one side; Asha (220 N) sits 3 m from the pivot on the other side. What is the missing weight in newtons?
30. 30.🪝 A load of 720 N hangs from a pulley system in which 4 rope sections hold up the load. What effort is needed, in newtons? (ideal pulleys)
31. 31.🏋️ A force of 360 N did 720 J of work. How many metres did the object move?
32. 32.💪 A box weighs 120 N. Taking 1 kg to weigh about 10 N, what is its mass in kilograms?
33. 33.🪝 A pulley system lifts a 460 N load with an effort of 230 N. What is its mechanical advantage (MA)?
34. 34.⚖️ A seesaw balances. Ravi (120 N) sits 4 m from the pivot on one side; Zoya (480 N) sits ? m from the pivot on the other side. What is the missing distance in metres?
35. 35.True or false: a crane hook block is a pulley. (a) False (b) True
36. 36.🪝 A bucket weighing 190 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: a seesaw is a pulley. (a) False (b) True
38. 38.💪 Is pushing a swing a push or a pull? (a) a push (b) a pull
39. 39.⚖️ Along a straight bar, measured from the left end, the effort is at 10 cm, the fulcrum at 70 cm and the load at 40 cm. Which class of lever is it? (a) class 1 (b) class 3 (c) class 2
40. 40.True or false: plucking a mango is a push. (a) True (b) False

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