Engineering Worksheet: Part 2 Test

Engineering lesson 16: Part 2 test: forces and machines · Set 847 · 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.🔍 Which is the odd one out? (a) sand on a slippery path (b) a rough doormat (c) a tyre with deep treads (d) skating on ice
2. 2.Which of these is a screw? (a) a door stopper (b) a wheelchair ramp (c) a bottle cap (d) a claw hammer on a nail
3. 3.⚖️ On a seesaw, a heavier child should sit … (a) farther from the pivot (b) closer to the pivot (c) on the pivot (d) anywhere
4. 4.🏋️ A force of 370 N did 2590 J of work. How many metres did the object move?
5. 5.💪 A force is a … (a) unit of time (b) push or a pull (c) kind of colour (d) type of sound
6. 6.⚖️ 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 1 (b) class 2 (c) class 3
7. 7.💪 A cart is pulled to the right with 75 N and to the left with 80 N. Which way does the net force act? (a) no net force (b) to the left (c) to the right
8. 8.True or false: powder on a carrom board gives more friction. (a) False (b) True
9. 9.True or false: kicking a football is a pull. (a) True (b) False
10. 10.Which of these is a wheel and axle? (a) a steering wheel (b) a bottle opener (c) a crane hook block (d) a knife edge
11. 11.🔍 Which is the odd one out? (a) a chisel (b) a knife edge (c) a well-bucket rope wheel (d) an axe blade
12. 12.⚖️ A seesaw balances. Asha (190 N) sits ? m from the pivot on one side; Ravi (380 N) sits 1 m from the pivot on the other side. What is the missing distance in metres?
13. 13.🔍 Which is the odd one out? (a) powder on a carrom board (b) skating on ice (c) a rough doormat (d) a wheel on ball bearings
14. 14.🛞 More or less friction: a wet tiled floor? (a) more friction (b) less friction
15. 15.💪 Which force is at work: pedalling a cycle? (a) gravity (b) friction (c) magnetic force (d) muscular force
16. 16.⚖️ Along a straight bar, measured from the left end, the effort is at 50 cm, the fulcrum at 10 cm and the load at 20 cm. Which class of lever is it? (a) class 1 (b) class 2 (c) class 3
17. 17.Which of these is caused by friction? (a) shoes grip the floor (b) an apple falls down (c) a compass needle turns (d) a river flows downhill
18. 18.⚖️ Along a straight bar, measured from the left end, the effort is at 50 cm, the fulcrum at 10 cm and the load at 80 cm. Which class of lever is it? (a) class 1 (b) class 3 (c) class 2
19. 19.🏋️ Pushing a crate 3 m took 450 J of work. What force was used, in newtons?
20. 20.⚖️ Along a straight bar, measured from the left end, the effort is at 0 cm, the fulcrum at 40 cm and the load at 70 cm. Which class of lever is it? (a) class 1 (b) class 2 (c) class 3
21. 21.💪 Which force is at work: rain falls to the ground? (a) gravity (b) magnetic force (c) friction (d) muscular force
22. 22.💪 Two children push a box to the right, one with 15 N and the other with 100 N. What is the net (total) force on the box, in newtons?
23. 23.💪 Two children push a box to the right, one with 10 N and the other with 15 N. What is the net (total) force on the box, in newtons?
24. 24.True or false: a seesaw is a class 1 lever (fulcrum in the middle). (a) True (b) False
25. 25.⚙️ How many simple machines are there in the usual list? (a) 10 (b) 3 (c) 6 (d) 12
26. 26.⚙️ A wedge is … (a) a bar on a pivot (b) two ramps back to back (c) a wheel on a rod (d) a rope on a wheel
27. 27.Which of these is a lever? (a) a flagpole rope wheel (b) a knife edge (c) a playground slide (d) a seesaw
28. 28.🛞 Is friction helpful or a problem here: shoe soles wearing out? (a) helpful (b) a problem
29. 29.True or false: a box pushed on carpet gives less friction. (a) False (b) True
30. 30.🪝 A pulley system lifts a 270 N load with an effort of 90 N. What is its mechanical advantage (MA)?
31. 31.🛞 More or less friction: skating on ice? (a) more friction (b) less friction
32. 32.⚖️ Which class of lever is a pair of tweezers? (a) class 1 (b) class 2 (c) class 3
33. 33.🪝 A winch has a wheel of radius 12 cm and an axle of radius 4 cm. What effort on the wheel lifts a 480 N bucket on the axle, in newtons? (ideal)
34. 34.⚖️ Which class of lever is a pair of scissors? (a) class 2 (b) class 1 (c) class 3
35. 35.🪝 A well winch has a handle (wheel) of radius 4 cm turning an axle of radius 2 cm. What is its mechanical advantage (MA)?
36. 36.⚖️ A lever bar balances. The load is 500 N at 30 cm from the fulcrum. The effort is ? N at 50 cm from the fulcrum on the other side. What is the missing force in newtons?
37. 37.True or false: a movable pulley needs effort = load. (a) False (b) True
38. 38.⚖️ A lever balances when … (a) the bar is short (b) both weights are equal (c) turning effects match (d) the fulcrum moves
39. 39.⚖️ Turning effect = force × … (a) colour of bar (b) distance from fulcrum (c) time taken (d) mass of fulcrum
40. 40.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 4 N, a glass sheet 6 N, a wooden plank 9 N, a carpet 13 N. How many newtons more were needed on a carpet than on ice?

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