Engineering Worksheet: Part 2 Test

Engineering lesson 16: Part 2 test: forces and machines · Set 958 · 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: a fixed pulley makes you pull 2× rope. (a) False (b) True
2. 2.True or false: opening a drawer is a push. (a) False (b) True
3. 3.🏋️ Work is done when a force moves something … (a) only upwards (b) without moving it (c) through a distance (d) very slowly
4. 4.💪 A bag has a mass of 30 kg. Taking 1 kg to weigh about 10 N, what is its weight in newtons?
5. 5.🪝 A bucket weighing 70 N is lifted with a single fixed pulley at the top of a well. What effort is needed, in newtons? (ideal pulley, no friction)
6. 6.🏋️ Can a simple machine reduce the work done? (a) only on Mondays (b) yes, by half (c) yes, always (d) no, work stays the same
7. 7.🛞 Is friction helpful or a problem here: striking a matchstick? (a) a problem (b) helpful
8. 8.⚖️ A lever balances when … (a) the fulcrum moves (b) both weights are equal (c) turning effects match (d) the bar is short
9. 9.🪝 A pulley system lifts a 360 N load with an effort of 120 N. What is its mechanical advantage (MA)?
10. 10.🏋️ A force of 270 N did 270 J of work. How many metres did the object move?
11. 11.🛞 Why are tyres made with deep treads? (a) to look nice (b) to save rubber (c) to go slower (d) to grip the road
12. 12.Which of these is caused by gravity? (a) a rolling ball slows (b) a thrown ball comes down (c) shoes grip the floor (d) brakes stop a bicycle
13. 13.🪝 Fixed or movable pulley: which one makes you pull 2× rope? (a) a fixed pulley (b) a movable pulley
14. 14.🏋️ A force of 470 N did 3290 J of work. How many metres did the object move?
15. 15.True or false: pushing a trolley is a push. (a) False (b) True
16. 16.⚖️ Turning effect = force × … (a) colour of bar (b) distance from fulcrum (c) time taken (d) mass of fulcrum
17. 17.Which of these is caused by friction? (a) a fridge magnet sticks (b) a compass needle turns (c) pedalling a cycle (d) rubbing hands warms them
18. 18.🛞 More or less friction: a grippy rubber sole? (a) less friction (b) more friction
19. 19.💪 In a tug of war, one team pulls right with 15 N and the other pulls left with 5 N. What is the size of the net force, in newtons?
20. 20.⚖️ Along a straight bar, measured from the left end, the effort is at 30 cm, the fulcrum at 60 cm and the load at 0 cm. Which class of lever is it? (a) class 2 (b) class 3 (c) class 1
21. 21.🪝 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)
22. 22.🪝 Fixed or movable pulley: which one rises with the load? (a) a fixed pulley (b) a movable pulley
23. 23.💪 A box weighs 430 N. Taking 1 kg to weigh about 10 N, what is its mass in kilograms?
24. 24.🔍 Which is the odd one out? (a) a window blind cord (b) a well-bucket rope wheel (c) a road up a hill (d) a crane hook block
25. 25.💪 A box weighs 400 N. Taking 1 kg to weigh about 10 N, what is its mass in kilograms?
26. 26.💪 A cart is pulled to the right with 95 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
27. 27.True or false: a wheel on ball bearings gives less friction. (a) False (b) True
28. 28.🏋️ A force of 400 N did 1600 J of work. How many metres did the object move?
29. 29.⚖️ A seesaw balances. Zoya (100 N) sits 3 m from the pivot on one side; Meena (300 N) sits ? m from the pivot on the other side. What is the missing distance in metres?
30. 30.⚖️ Which class of lever is a beam balance? (a) class 3 (b) class 1 (c) class 2
31. 31.Which of these is an inclined plane? (a) a wood screw (b) a wheelchair ramp (c) the tip of a nail (d) a window blind cord
32. 32.🔍 Which is the odd one out? (a) a tyre with deep treads (b) a box pushed on carpet (c) chalk on a gym bar (d) powder on a carrom board
33. 33.⚖️ A seesaw balances. Kabir (? N) sits 2 m from the pivot on one side; Meena (260 N) sits 4 m from the pivot on the other side. What is the missing weight in newtons?
34. 34.🪝 A well winch has a handle (wheel) of radius 6 cm turning an axle of radius 1 cm. What is its mechanical advantage (MA)?
35. 35.⚙️ Which simple machine is an axe blade? (a) lever (b) wheel and axle (c) wedge (d) pulley
36. 36.Which of these is an inclined plane? (a) a playground slide (b) a seesaw (c) a well-bucket rope wheel (d) a chisel
37. 37.⚙️ Most simple machines make work easier by letting us … (a) switch off gravity (b) make new energy (c) use a smaller force (d) stop all friction
38. 38.⚖️ A seesaw balances. Kabir (? N) sits 4 m from the pivot on one side; Ravi (440 N) sits 4 m from the pivot on the other side. What is the missing weight in newtons?
39. 39.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 9 N, sandpaper 11 N, a glass sheet 2 N, a wooden plank 5 N. Which surface gave the least friction? (a) a wooden plank (b) a glass sheet (c) a carpet (d) sandpaper
40. 40.⚖️ On a seesaw, a heavier child should sit … (a) anywhere (b) farther from the pivot (c) closer to the pivot (d) on the pivot

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