Engineering Worksheet: Part 2 Test

Engineering lesson 16: Part 2 test: forces and machines · Set 490 · 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.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 5 N, a carpet 7 N, sandpaper 11 N, a glass sheet 4 N. Which surface gave the most friction? (a) a wooden plank (b) a carpet (c) a glass sheet (d) sandpaper
2. 2.🏋️ A smooth ramp is 6 m long and rises 3 m. What effort pushes a 200 N box up it, in newtons? (ideal ramp, no friction)
3. 3.⚙️ How many simple machines are there in the usual list? (a) 10 (b) 3 (c) 6 (d) 12
4. 4.🔍 Which is the odd one out? (a) skating on ice (b) a smooth steel slide (c) oil on a squeaky hinge (d) chalk on a gym bar
5. 5.🏋️ A 7 kg box is lifted straight up by 2 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
6. 6.🏋️ A smooth ramp is 6 m long and rises 3 m. What effort pushes a 1700 N box up it, in newtons? (ideal ramp, no friction)
7. 7.🏋️ A force of 160 N did 1280 J of work. How many metres did the object move?
8. 8.True or false: a fixed pulley needs effort = load. (a) False (b) True
9. 9.True or false: a wheel on ball bearings gives more friction. (a) True (b) False
10. 10.💪 Is plucking a mango a push or a pull? (a) a push (b) a pull
11. 11.⚖️ 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
12. 12.⚖️ A lever bar balances. The load is ? N at 20 cm from the fulcrum. The effort is 180 N at 40 cm from the fulcrum on the other side. What is the missing force in newtons?
13. 13.True or false: a crane hook block is a wheel and axle. (a) False (b) True
14. 14.🏋️ Work is done when a force moves something … (a) through a distance (b) without moving it (c) only upwards (d) very slowly
15. 15.⚖️ On a seesaw, a heavier child should sit … (a) anywhere (b) on the pivot (c) farther from the pivot (d) closer to the pivot
16. 16.⚖️ Which class of lever is a fishing rod? (a) class 1 (b) class 3 (c) class 2
17. 17.🛞 Why are tyres made with deep treads? (a) to grip the road (b) to save rubber (c) to look nice (d) to go slower
18. 18.🪝 A bucket weighing 180 N is lifted with a single fixed pulley at the top of a well. What effort is needed, in newtons? (ideal pulley, no friction)
19. 19.🛞 How can we reduce friction in a machine? (a) add sand (b) oil the moving parts (c) press parts harder (d) make parts rough
20. 20.🔍 Which is the odd one out? (a) a wheel on ball bearings (b) chalk on a gym bar (c) sand on a slippery path (d) a rough doormat
21. 21.⚖️ Going along a lever from one end to the other, the order is: effort, load, fulcrum. Which class of lever is it? (a) class 3 (b) class 1 (c) class 2
22. 22.🏋️ A smooth ramp is 6 m long and rises 3 m. What effort pushes a 400 N box up it, in newtons? (ideal ramp, no friction)
23. 23.🪝 More rope sections holding a load means … (a) less effort needed (b) no change (c) more effort needed (d) the load floats
24. 24.🏋️ A smooth ramp is 8 m long and rises 2 m. What effort pushes a 1400 N box up it, in newtons? (ideal ramp, no friction)
25. 25.🏋️ Pushing a crate 10 m took 100 J of work. What force was used, in newtons?
26. 26.⚖️ A seesaw balances. Meena (360 N) sits 3 m from the pivot on one side; Arjun (360 N) sits ? m from the pivot on the other side. What is the missing distance in metres?
27. 27.⚙️ A screw is really … (a) a tiny pulley (b) a kind of wheel (c) a bent lever (d) a ramp wrapped round
28. 28.Which of these is caused by friction? (a) an apple falls down (b) pedalling a cycle (c) shoes grip the floor (d) a magnet picks up pins
29. 29.💪 Two equal forces push on a box from opposite sides. They are … (a) doubled (b) unbalanced (c) balanced (d) gravity
30. 30.True or false: a beam balance is a class 1 lever (fulcrum in the middle). (a) True (b) False
31. 31.True or false: pressing a doorbell is a pull. (a) True (b) False
32. 32.💪 In a tug of war, one team pulls right with 90 N and the other pulls left with 5 N. What is the size of the net force, in newtons?
33. 33.🏋️ A smooth ramp is 12 m long and rises 2 m. What effort pushes a 1800 N box up it, in newtons? (ideal ramp, no friction)
34. 34.🏋️ Pushing a crate 6 m took 960 J of work. What force was used, in newtons?
35. 35.True or false: a road up a hill is a wheel and axle. (a) True (b) False
36. 36.⚙️ Which simple machine is a round doorknob? (a) screw (b) inclined plane (c) lever (d) wheel and axle
37. 37.🏋️ Can a simple machine reduce the work done? (a) only on Mondays (b) yes, always (c) yes, by half (d) no, work stays the same
38. 38.⚖️ A lever balances when … (a) the bar is short (b) the fulcrum moves (c) turning effects match (d) both weights are equal
39. 39.🪝 A pulley system has 2 rope sections holding up the load. To lift the load by 5 m, how many metres of rope must you pull?
40. 40.🏋️ In which unit is work measured? (a) newton (N) (b) joule (J) (c) watt hour (d) metre (m)

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