Engineering Worksheet: Part 2 Test

Engineering lesson 16: Part 2 test: forces and machines · Set 552 · 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: powder on a carrom board gives more friction. (a) True (b) False
2. 2.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 7 N, a carpet 8 N, sandpaper 11 N, ice 4 N. How many newtons more were needed on sandpaper than on ice?
3. 3.⚖️ On a seesaw, a heavier child should sit … (a) farther from the pivot (b) closer to the pivot (c) anywhere (d) on the pivot
4. 4.🔍 Which is the odd one out? (a) a rough doormat (b) a box pushed on carpet (c) oil on a squeaky hinge (d) sand on a slippery path
5. 5.Which of these is a wedge? (a) a nut and bolt (b) a wood screw (c) a steering wheel (d) the tip of a nail
6. 6.🏋️ A force of 120 N pushes a cart 4 m along the floor. How much work is done, in joules?
7. 7.⚖️ A seesaw balances. Arjun (? N) sits 1 m from the pivot on one side; Zoya (130 N) sits 1 m from the pivot on the other side. What is the missing weight in newtons?
8. 8.🏋️ A 10 kg box is lifted straight up by 4 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
9. 9.⚙️ Which simple machine is a bottle opener? (a) wedge (b) screw (c) lever (d) pulley
10. 10.💪 A force is a … (a) push or a pull (b) unit of time (c) kind of colour (d) type of sound
11. 11.💪 In a tug of war, one team pulls right with 40 N and the other pulls left with 35 N. What is the size of the net force, in newtons?
12. 12.🏋️ Pushing a crate 4 m took 400 J of work. What force was used, in newtons?
13. 13.🔍 Which is the odd one out? (a) oil on a squeaky hinge (b) a grippy rubber sole (c) a wet tiled floor (d) skating on ice
14. 14.⚖️ Going along a lever from one end to the other, the order is: fulcrum, effort, load. Which class of lever is it? (a) class 2 (b) class 1 (c) class 3
15. 15.⚖️ A lever balances when … (a) the fulcrum moves (b) the bar is short (c) both weights are equal (d) turning effects match
16. 16.True or false: a wet tiled floor gives more friction. (a) False (b) True
17. 17.🏋️ A machine lifts a load of 700 N when you push with 140 N. What is its mechanical advantage (MA)?
18. 18.💪 Which force pulls everything towards the Earth? (a) friction (b) wind (c) gravity (d) magnetism
19. 19.💪 Which force is at work: a thrown ball comes down? (a) friction (b) magnetic force (c) gravity (d) muscular force
20. 20.💪 In a tug of war, one team pulls right with 35 N and the other pulls left with 5 N. What is the size of the net force, in newtons?
21. 21.🏋️ Can a simple machine reduce the work done? (a) yes, by half (b) yes, always (c) only on Mondays (d) no, work stays the same
22. 22.🏋️ A force of 480 N did 2400 J of work. How many metres did the object move?
23. 23.True or false: hitting a cricket ball is a pull. (a) False (b) True
24. 24.Which of these is a lever? (a) a steering wheel (b) a well winch handle (c) a flagpole rope wheel (d) a seesaw
25. 25.💪 A box weighs 170 N. Taking 1 kg to weigh about 10 N, what is its mass in kilograms?
26. 26.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 1 N, a glass sheet 5 N, a carpet 8 N, sandpaper 9 N. Which surface gave the least friction? (a) sandpaper (b) a glass sheet (c) a carpet (d) ice
27. 27.True or false: sand on a slippery path gives more friction. (a) False (b) True
28. 28.⚖️ 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
29. 29.⚖️ A seesaw balances. Ravi (? N) sits 4 m from the pivot on one side; Zoya (400 N) sits 1 m from the pivot on the other side. What is the missing weight in newtons?
30. 30.🪝 A well winch has a handle (wheel) of radius 7 cm turning an axle of radius 1 cm. What is its mechanical advantage (MA)?
31. 31.🪝 A bucket weighing 140 N is lifted with a single fixed pulley at the top of a well. What effort is needed, in newtons? (ideal pulley, no friction)
32. 32.⚖️ A seesaw balances. Arjun (400 N) sits ? m from the pivot on one side; Ravi (200 N) sits 4 m from the pivot on the other side. What is the missing distance in metres?
33. 33.🏋️ A force of 490 N did 3430 J of work. How many metres did the object move?
34. 34.💪 Which force is at work: an apple falls down? (a) muscular force (b) magnetic force (c) friction (d) gravity
35. 35.💪 Which can a force NOT do? (a) change its colour (b) start it moving (c) stop it moving (d) change its shape
36. 36.💪 A bag has a mass of 14 kg. Taking 1 kg to weigh about 10 N, what is its weight in newtons?
37. 37.💪 Two equal forces push on a box from opposite sides. They are … (a) doubled (b) gravity (c) unbalanced (d) balanced
38. 38.🪝 A pulley system lifts a 300 N load with an effort of 150 N. What is its mechanical advantage (MA)?
39. 39.⚙️ A wedge is … (a) a bar on a pivot (b) a wheel on a rod (c) two ramps back to back (d) a rope on a wheel
40. 40.⚙️ How many simple machines are there in the usual list? (a) 6 (b) 3 (c) 10 (d) 12

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