Engineering Worksheet: Part 2 Test

Engineering lesson 16: Part 2 test: forces and machines · Set 276 · 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: an axe blade is an inclined plane. (a) True (b) False
2. 2.🛞 Friction acts … (a) only on ice (b) only upwards (c) with the motion (d) against the motion
3. 3.⚙️ How many simple machines are there in the usual list? (a) 12 (b) 3 (c) 10 (d) 6
4. 4.True or false: oil on a squeaky hinge gives less friction. (a) False (b) True
5. 5.⚙️ Which simple machine is a screw jack? (a) wedge (b) screw (c) wheel and axle (d) lever
6. 6.🏋️ A machine lifts a load of 200 N when you push with 40 N. What is its mechanical advantage (MA)?
7. 7.🔍 Which is the odd one out? (a) sand on a slippery path (b) a box pushed on carpet (c) a grippy rubber sole (d) a smooth steel slide
8. 8.💪 Two children push a box to the right, one with 95 N and the other with 50 N. What is the net (total) force on the box, in newtons?
9. 9.🏋️ A force of 450 N did 4050 J of work. How many metres did the object move?
10. 10.True or false: a crane hook block is a lever. (a) True (b) False
11. 11.💪 A box weighs 350 N. Taking 1 kg to weigh about 10 N, what is its mass in kilograms?
12. 12.🪝 More rope sections holding a load means … (a) less effort needed (b) no change (c) more effort needed (d) the load floats
13. 13.⚖️ Which class of lever is a wheelbarrow? (a) class 2 (b) class 3 (c) class 1
14. 14.🏋️ 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
15. 15.🛞 How can we reduce friction in a machine? (a) press parts harder (b) make parts rough (c) add sand (d) oil the moving parts
16. 16.🏋️ Work is done when a force moves something … (a) only upwards (b) without moving it (c) through a distance (d) very slowly
17. 17.Which of these is caused by friction? (a) rain falls to the ground (b) squeezing a lemon (c) pedalling a cycle (d) brakes stop a bicycle
18. 18.💪 Which force is at work: brakes stop a bicycle? (a) friction (b) gravity (c) muscular force (d) magnetic force
19. 19.True or false: a knife edge is a wedge. (a) False (b) True
20. 20.🏋️ A force of 380 N did 2280 J of work. How many metres did the object move?
21. 21.🛞 More or less friction: sand on a slippery path? (a) more friction (b) less friction
22. 22.True or false: a wet tiled floor gives more friction. (a) True (b) False
23. 23.🛞 Is friction helpful or a problem here: a knot holding a rope? (a) a problem (b) helpful
24. 24.⚖️ Along a straight bar, measured from the left end, the effort is at 0 cm, the fulcrum at 20 cm and the load at 10 cm. Which class of lever is it? (a) class 1 (b) class 2 (c) class 3
25. 25.🛞 Is friction helpful or a problem here: walking without slipping? (a) helpful (b) a problem
26. 26.⚖️ A seesaw balances. Arjun (? N) sits 2 m from the pivot on one side; Asha (380 N) sits 1 m from the pivot on the other side. What is the missing weight in newtons?
27. 27.🪝 A winch has a wheel of radius 16 cm and an axle of radius 4 cm. What effort on the wheel lifts a 200 N bucket on the axle, in newtons? (ideal)
28. 28.💪 A bag has a mass of 60 kg. Taking 1 kg to weigh about 10 N, what is its weight in newtons?
29. 29.🪝 A pulley system lifts a 90 N load with an effort of 30 N. What is its mechanical advantage (MA)?
30. 30.⚖️ A lever bar balances. The load is 600 N at ? cm from the fulcrum. The effort is 180 N at 100 cm from the fulcrum on the other side. What is the missing distance in centimetres?
31. 31.⚖️ A seesaw balances. Kabir (? N) sits 3 m from the pivot on one side; Meena (420 N) sits 4 m from the pivot on the other side. What is the missing weight in newtons?
32. 32.True or false: a wheelchair ramp is a pulley. (a) True (b) False
33. 33.⚖️ Along a straight bar, measured from the left end, the effort is at 30 cm, the fulcrum at 60 cm and the load at 100 cm. Which class of lever is it? (a) class 2 (b) class 1 (c) class 3
34. 34.🛞 More or less friction: a grippy rubber sole? (a) less friction (b) more friction
35. 35.⚖️ A seesaw balances. Asha (100 N) sits ? m from the pivot on one side; Meena (400 N) sits 1 m from the pivot on the other side. What is the missing distance in metres?
36. 36.⚖️ On a seesaw, a heavier child should sit … (a) anywhere (b) closer to the pivot (c) on the pivot (d) farther from the pivot
37. 37.🛞 More or less friction: a wheel on ball bearings? (a) more friction (b) less friction
38. 38.💪 Which force is at work: a thrown ball comes down? (a) magnetic force (b) gravity (c) friction (d) muscular force
39. 39.🛞 Is friction helpful or a problem here: writing with a pencil? (a) a problem (b) helpful
40. 40.True or false: sand on a slippery path gives more friction. (a) False (b) True

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