Engineering Worksheet: Part 2 Test

Engineering lesson 16: Part 2 test: forces and machines · Set 157 · 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.🏋️ A smooth ramp is 10 m long and rises 2 m. What effort pushes a 3500 N box up it, in newtons? (ideal ramp, no friction)
2. 2.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 6 N, sandpaper 8 N, ice 1 N, a glass sheet 5 N. Which surface gave the most friction? (a) a glass sheet (b) sandpaper (c) ice (d) a carpet
3. 3.💪 Which force is at work: lifting a school bag? (a) friction (b) magnetic force (c) gravity (d) muscular force
4. 4.💪 Two children push a box to the right, one with 55 N and the other with 5 N. What is the net (total) force on the box, in newtons?
5. 5.🏋️ Can a simple machine reduce the work done? (a) yes, always (b) only on Mondays (c) yes, by half (d) no, work stays the same
6. 6.🪝 A load of 720 N hangs from a pulley system in which 4 rope sections hold up the load. What effort is needed, in newtons? (ideal pulleys)
7. 7.🏋️ A machine lifts a load of 40 N when you push with 10 N. What is its mechanical advantage (MA)?
8. 8.🪝 A wheel and axle is a big wheel fixed to … (a) a sharp wedge (b) a loose rope (c) a flat ramp (d) a smaller rod (axle)
9. 9.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 5 N, sandpaper 8 N, ice 1 N, a glass sheet 4 N. Which surface gave the least friction? (a) sandpaper (b) a carpet (c) ice (d) a glass sheet
10. 10.🏋️ A force of 370 N pushes a cart 1 m along the floor. How much work is done, in joules?
11. 11.⚖️ In a class 1 lever, what is in the middle? (a) the fulcrum (b) nothing (c) the effort (d) the load
12. 12.⚖️ A seesaw balances. Ravi (380 N) sits 2 m from the pivot on one side; Kabir (? N) sits 2 m from the pivot on the other side. What is the missing weight in newtons?
13. 13.🪝 A pulley system has 2 rope sections holding up the load. To lift the load by 3 m, how many metres of rope must you pull?
14. 14.⚖️ A lever bar balances. The load is 150 N at 50 cm from the fulcrum. The effort is 150 N at ? cm from the fulcrum on the other side. What is the missing distance in centimetres?
15. 15.🛞 More or less friction: sand on a slippery path? (a) more friction (b) less friction
16. 16.Which of these is caused by friction? (a) a river flows downhill (b) shoes grip the floor (c) rain falls to the ground (d) lifting a school bag
17. 17.⚖️ To lift a heavy rock with a crowbar more easily, push … (a) near the fulcrum (b) on the fulcrum (c) far from the fulcrum (d) on the rock
18. 18.💪 A bag has a mass of 14 kg. Taking 1 kg to weigh about 10 N, what is its weight in newtons?
19. 19.🪝 More rope sections holding a load means … (a) the load floats (b) more effort needed (c) no change (d) less effort needed
20. 20.🛞 More or less friction: a wet tiled floor? (a) more friction (b) less friction
21. 21.⚖️ Going along a lever from one end to the other, the order is: load, fulcrum, effort. Which class of lever is it? (a) class 1 (b) class 2 (c) class 3
22. 22.🏋️ In which unit is work measured? (a) watt hour (b) metre (m) (c) joule (J) (d) newton (N)
23. 23.⚖️ A seesaw balances. Ravi (450 N) sits ? m from the pivot on one side; Meena (450 N) sits 3 m from the pivot on the other side. What is the missing distance in metres?
24. 24.⚖️ A lever bar balances. The load is 150 N at 10 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?
25. 25.💪 Which force is at work: an apple falls down? (a) muscular force (b) magnetic force (c) friction (d) gravity
26. 26.⚖️ 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
27. 27.⚖️ A lever bar balances. The load is 200 N at ? cm from the fulcrum. The effort is 100 N at 20 cm from the fulcrum on the other side. What is the missing distance in centimetres?
28. 28.⚖️ Along a straight bar, measured from the left end, the effort is at 30 cm, the fulcrum at 70 cm and the load at 90 cm. Which class of lever is it? (a) class 3 (b) class 2 (c) class 1
29. 29.💪 In which unit do we measure force? (a) second (s) (b) newton (N) (c) metre (m) (d) litre (L)
30. 30.🛞 How can we reduce friction in a machine? (a) oil the moving parts (b) make parts rough (c) press parts harder (d) add sand
31. 31.⚖️ Which class of lever is a wheelbarrow? (a) class 3 (b) class 1 (c) class 2
32. 32.⚙️ Which simple machine is a seesaw? (a) screw (b) pulley (c) inclined plane (d) lever
33. 33.⚖️ On a seesaw, a heavier child should sit … (a) on the pivot (b) closer to the pivot (c) farther from the pivot (d) anywhere
34. 34.🛞 Is friction helpful or a problem here: brakes stopping a cycle? (a) a problem (b) helpful
35. 35.💪 Which force is at work: pedalling a cycle? (a) friction (b) magnetic force (c) muscular force (d) gravity
36. 36.🛞 Is friction helpful or a problem here: writing with a pencil? (a) helpful (b) a problem
37. 37.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 6 N, a wooden plank 7 N, sandpaper 10 N, ice 3 N. Which surface gave the least friction? (a) ice (b) a wooden plank (c) sandpaper (d) a glass sheet
38. 38.⚙️ Which simple machine is a bottle cap? (a) inclined plane (b) lever (c) screw (d) wedge
39. 39.💪 Is pressing a doorbell a push or a pull? (a) a pull (b) a push
40. 40.Which of these is caused by gravity? (a) shoes grip the floor (b) a magnet picks up pins (c) a river flows downhill (d) squeezing a lemon

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