Engineering Worksheet: Part 2 Test

Engineering lesson 16: Part 2 test: forces and machines · Set 722 · 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.🪝 Fixed or movable pulley: which one needs effort = load? (a) a fixed pulley (b) a movable pulley
2. 2.🔍 Which is the odd one out? (a) a seesaw (b) a nutcracker (c) a crowbar (d) a door stopper
3. 3.⚖️ A lever bar balances. The load is ? N at 20 cm from the fulcrum. The effort is 160 N at 30 cm from the fulcrum on the other side. What is the missing force in newtons?
4. 4.🏋️ A force of 260 N did 260 J of work. How many metres did the object move?
5. 5.🛞 How can we reduce friction in a machine? (a) press parts harder (b) oil the moving parts (c) make parts rough (d) add sand
6. 6.⚖️ On a seesaw, a heavier child should sit … (a) closer to the pivot (b) on the pivot (c) farther from the pivot (d) anywhere
7. 7.🛞 More or less friction: a rough doormat? (a) more friction (b) less friction
8. 8.🪝 More rope sections holding a load means … (a) more effort needed (b) less effort needed (c) no change (d) the load floats
9. 9.⚖️ A seesaw balances. Asha (760 N) sits 3 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?
10. 10.True or false: a lemon squeezer is a class 3 lever (effort in the middle). (a) True (b) False
11. 11.🏋️ Work is done when a force moves something … (a) only upwards (b) without moving it (c) through a distance (d) very slowly
12. 12.⚖️ A lever bar balances. The load is ? N at 50 cm from the fulcrum. The effort is 250 N at 20 cm from the fulcrum on the other side. What is the missing force in newtons?
13. 13.⚖️ Along a straight bar, measured from the left end, the effort is at 20 cm, the fulcrum at 70 cm and the load at 30 cm. Which class of lever is it? (a) class 1 (b) class 2 (c) class 3
14. 14.🪝 A bucket weighing 20 N is lifted with a single fixed pulley at the top of a well. What effort is needed, in newtons? (ideal pulley, no friction)
15. 15.🏋️ Pushing a crate 5 m took 1150 J of work. What force was used, in newtons?
16. 16.🏋️ A force of 130 N did 910 J of work. How many metres did the object move?
17. 17.🪝 A load of 660 N hangs from a pulley system in which 3 rope sections hold up the load. What effort is needed, in newtons? (ideal pulleys)
18. 18.🏋️ A force of 90 N did 270 J of work. How many metres did the object move?
19. 19.🪝 A bucket weighing 40 N is lifted with a single fixed pulley at the top of a well. What effort is needed, in newtons? (ideal pulley, no friction)
20. 20.💪 Which force is at work: shoes grip the floor? (a) friction (b) gravity (c) muscular force (d) magnetic force
21. 21.⚖️ A lever bar balances. The load is ? N at 10 cm from the fulcrum. The effort is 60 N at 30 cm from the fulcrum on the other side. What is the missing force in newtons?
22. 22.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 5 N, a carpet 8 N, sandpaper 11 N, a glass sheet 3 N. How many newtons more were needed on sandpaper than on a glass sheet?
23. 23.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 4 N, a carpet 8 N, sandpaper 10 N, a glass sheet 3 N. Which surface gave the most friction? (a) a carpet (b) a glass sheet (c) a wooden plank (d) sandpaper
24. 24.True or false: a movable pulley stays in one place. (a) False (b) True
25. 25.🪝 What does a single fixed pulley change? (a) the colour of rope (b) the size of the load (c) gravity (d) the direction of pull
26. 26.True or false: a fixed pulley stays in one place. (a) False (b) True
27. 27.⚖️ A lever bar balances. The load is 40 N at ? cm from the fulcrum. The effort is 10 N at 40 cm from the fulcrum on the other side. What is the missing distance in centimetres?
28. 28.Which of these is caused by gravity? (a) lifting a school bag (b) squeezing a lemon (c) a river flows downhill (d) a fridge magnet sticks
29. 29.🛞 Friction acts … (a) against the motion (b) only upwards (c) with the motion (d) only on ice
30. 30.🏋️ A force of 320 N pushes a cart 3 m along the floor. How much work is done, in joules?
31. 31.⚖️ Which class of lever is a broom when sweeping? (a) class 2 (b) class 1 (c) class 3
32. 32.⚖️ A seesaw balances. Ravi (220 N) sits 4 m from the pivot on one side; Zoya (440 N) sits ? m from the pivot on the other side. What is the missing distance in metres?
33. 33.🔍 Which is the odd one out? (a) a grippy rubber sole (b) a smooth steel slide (c) powder on a carrom board (d) a wet tiled floor
34. 34.⚖️ Which class of lever is a nutcracker? (a) class 2 (b) class 3 (c) class 1
35. 35.🛞 Is friction helpful or a problem here: brakes stopping a cycle? (a) a problem (b) helpful
36. 36.🏋️ Mechanical advantage (MA) = … (a) load + effort (b) load × effort (c) load ÷ effort (d) effort ÷ load
37. 37.🔍 Which is the odd one out? (a) an axe blade (b) a truck loading ramp (c) a door stopper (d) a knife edge
38. 38.⚖️ A seesaw balances. Meena (? N) sits 3 m from the pivot on one side; Asha (360 N) sits 1 m from the pivot on the other side. What is the missing weight in newtons?
39. 39.⚖️ Along a straight bar, measured from the left end, the effort is at 20 cm, the fulcrum at 30 cm and the load at 70 cm. Which class of lever is it? (a) class 3 (b) class 2 (c) class 1
40. 40.True or false: a box pushed on carpet gives less friction. (a) False (b) True

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