Engineering Worksheet: Part 2 Test

Engineering lesson 16: Part 2 test: forces and machines · Set 688 · 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.🛞 More or less friction: sand on a slippery path? (a) less friction (b) more friction
2. 2.🪝 Fixed or movable pulley: which one halves the effort? (a) a movable pulley (b) a fixed pulley
3. 3.True or false: a pair of kitchen tongs is a class 3 lever (effort in the middle). (a) False (b) True
4. 4.Which of these is an inclined plane? (a) a screw jack (b) a crane hook block (c) a crowbar (d) a road up a hill
5. 5.True or false: a knife edge is a wedge. (a) True (b) False
6. 6.True or false: powder on a carrom board gives more friction. (a) False (b) True
7. 7.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 9 N, a carpet 12 N, ice 3 N, a glass sheet 6 N. Which surface gave the least friction? (a) ice (b) a wooden plank (c) a carpet (d) a glass sheet
8. 8.True or false: a wheelchair ramp is a wheel and axle. (a) False (b) True
9. 9.💪 A bag has a mass of 18 kg. Taking 1 kg to weigh about 10 N, what is its weight in newtons?
10. 10.🏋️ A smooth ramp is 5 m long and rises 1 m. What effort pushes a 5000 N box up it, in newtons? (ideal ramp, no friction)
11. 11.⚖️ A lever bar balances. The load is 120 N at 10 cm from the fulcrum. The effort is 20 N at ? cm from the fulcrum on the other side. What is the missing distance in centimetres?
12. 12.⚖️ A seesaw balances. Ravi (? N) sits 2 m from the pivot on one side; Asha (400 N) sits 1 m from the pivot on the other side. What is the missing weight in newtons?
13. 13.🪝 A load of 200 N hangs from a pulley system in which 2 rope sections hold up the load. What effort is needed, in newtons? (ideal pulleys)
14. 14.⚖️ Which class of lever is a seesaw? (a) class 2 (b) class 3 (c) class 1
15. 15.⚖️ A lever bar balances. The load is ? N at 10 cm from the fulcrum. The effort is 90 N at 30 cm from the fulcrum on the other side. What is the missing force in newtons?
16. 16.⚖️ A seesaw balances. Arjun (? N) sits 1 m from the pivot on one side; Kabir (160 N) sits 1 m from the pivot on the other side. What is the missing weight in newtons?
17. 17.🛞 Is friction helpful or a problem here: writing with a pencil? (a) helpful (b) a problem
18. 18.⚙️ Which simple machine is a truck loading ramp? (a) wheel and axle (b) inclined plane (c) pulley (d) screw
19. 19.🪝 A bucket weighing 420 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.🏋️ A force of 10 N pushes a cart 1 m along the floor. How much work is done, in joules?
21. 21.🛞 More or less friction: a tyre with deep treads? (a) more friction (b) less friction
22. 22.🏋️ Pushing a crate 3 m took 1320 J of work. What force was used, in newtons?
23. 23.⚖️ A lever bar balances. The load is 800 N at 20 cm from the fulcrum. The effort is ? N at 80 cm from the fulcrum on the other side. What is the missing force in newtons?
24. 24.Which of these is caused by friction? (a) a thrown ball comes down (b) a river flows downhill (c) a compass needle turns (d) brakes stop a bicycle
25. 25.🏋️ Can a simple machine reduce the work done? (a) no, work stays the same (b) yes, by half (c) only on Mondays (d) yes, always
26. 26.⚖️ Along a straight bar, measured from the left end, the effort is at 30 cm, the fulcrum at 20 cm and the load at 10 cm. Which class of lever is it? (a) class 2 (b) class 1 (c) class 3
27. 27.💪 Two children push a box to the right, one with 40 N and the other with 70 N. What is the net (total) force on the box, in newtons?
28. 28.💪 Which can a force NOT do? (a) change its colour (b) stop it moving (c) change its shape (d) start it moving
29. 29.🔍 Which is the odd one out? (a) oil on a squeaky hinge (b) a wheel on ball bearings (c) a wet tiled floor (d) a grippy rubber sole
30. 30.True or false: a movable pulley hangs on the rope loop. (a) True (b) False
31. 31.⚙️ A screw is really … (a) a tiny pulley (b) a ramp wrapped round (c) a kind of wheel (d) a bent lever
32. 32.⚖️ On a seesaw, a heavier child should sit … (a) closer to the pivot (b) farther from the pivot (c) on the pivot (d) anywhere
33. 33.⚙️ How many simple machines are there in the usual list? (a) 10 (b) 3 (c) 6 (d) 12
34. 34.True or false: a nutcracker is a lever. (a) True (b) False
35. 35.True or false: a rough doormat gives less friction. (a) False (b) True
36. 36.🏋️ In which unit is work measured? (a) newton (N) (b) metre (m) (c) watt hour (d) joule (J)
37. 37.🪝 A wheel and axle is a big wheel fixed to … (a) a flat ramp (b) a loose rope (c) a sharp wedge (d) a smaller rod (axle)
38. 38.🛞 Is friction helpful or a problem here: dragging a heavy box? (a) helpful (b) a problem
39. 39.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 9 N, a carpet 12 N, ice 2 N, a glass sheet 6 N. Which surface gave the most friction? (a) a carpet (b) a glass sheet (c) ice (d) a wooden plank
40. 40.🪝 A load of 60 N hangs from a pulley system in which 3 rope sections hold up the load. What effort is needed, in newtons? (ideal pulleys)

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