Engineering Worksheet: Part 2 Test

Engineering lesson 16: Part 2 test: forces and machines · Set 900 · 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: sandpaper 6 N, ice 1 N, a wooden plank 3 N, a carpet 4 N. Which surface gave the least friction? (a) ice (b) a wooden plank (c) a carpet (d) sandpaper
2. 2.💪 Two children push a box to the right, one with 40 N and the other with 90 N. What is the net (total) force on the box, in newtons?
3. 3.🛞 How can we reduce friction in a machine? (a) add sand (b) oil the moving parts (c) press parts harder (d) make parts rough
4. 4.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 7 N, ice 1 N, a glass sheet 4 N, a wooden plank 6 N. Which surface gave the least friction? (a) a glass sheet (b) ice (c) sandpaper (d) a wooden plank
5. 5.⚖️ A seesaw balances. Kabir (160 N) sits ? m from the pivot on one side; Zoya (320 N) sits 1 m from the pivot on the other side. What is the missing distance in metres?
6. 6.🪝 A pulley system lifts an 80 N load with an effort of 40 N. What is its mechanical advantage (MA)?
7. 7.🪝 Fixed or movable pulley: which one stays in one place? (a) a movable pulley (b) a fixed pulley
8. 8.🏋️ A smooth ramp is 5 m long and rises 1 m. What effort pushes a 5000 N box up it, in newtons? (ideal ramp, no friction)
9. 9.True or false: a smooth steel slide gives less friction. (a) False (b) True
10. 10.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 5 N, a carpet 9 N, sandpaper 13 N, a glass sheet 2 N. How many newtons more were needed on sandpaper than on a glass sheet?
11. 11.⚖️ Which class of lever is a beam balance? (a) class 2 (b) class 3 (c) class 1
12. 12.💪 A box weighs 590 N. Taking 1 kg to weigh about 10 N, what is its mass in kilograms?
13. 13.Which of these is a lever? (a) a chisel (b) a bottle opener (c) a flagpole rope wheel (d) a crane hook block
14. 14.💪 A bag has a mass of 44 kg. Taking 1 kg to weigh about 10 N, what is its weight in newtons?
15. 15.💪 In a tug of war, one team pulls left with 40 N and the other pulls right with 20 N. What is the size of the net force, in newtons?
16. 16.🪝 A wheel and axle is a big wheel fixed to … (a) a smaller rod (axle) (b) a flat ramp (c) a loose rope (d) a sharp wedge
17. 17.⚖️ Along a straight bar, measured from the left end, the effort is at 50 cm, the fulcrum at 10 cm and the load at 20 cm. Which class of lever is it? (a) class 1 (b) class 3 (c) class 2
18. 18.⚖️ In a class 1 lever, what is in the middle? (a) the fulcrum (b) nothing (c) the load (d) the effort
19. 19.🔍 Which is the odd one out? (a) a playground slide (b) a road up a hill (c) a wood screw (d) a wheelchair ramp
20. 20.True or false: a well-bucket rope wheel is a pulley. (a) False (b) True
21. 21.True or false: pressing a doorbell is a pull. (a) False (b) True
22. 22.⚙️ How many simple machines are there in the usual list? (a) 3 (b) 12 (c) 6 (d) 10
23. 23.🔍 Which is the odd one out? (a) a tyre with deep treads (b) a grippy rubber sole (c) a smooth steel slide (d) chalk on a gym bar
24. 24.⚖️ Which class of lever is a crowbar? (a) class 3 (b) class 1 (c) class 2
25. 25.🪝 Fixed or movable pulley: which one needs effort = load? (a) a fixed pulley (b) a movable pulley
26. 26.⚖️ A lever balances when … (a) the fulcrum moves (b) turning effects match (c) both weights are equal (d) the bar is short
27. 27.⚖️ Which class of lever is a pair of pliers? (a) class 3 (b) class 2 (c) class 1
28. 28.⚖️ A seesaw balances. Ravi (120 N) sits 3 m from the pivot on one side; Meena (? N) sits 1 m from the pivot on the other side. What is the missing weight in newtons?
29. 29.💪 Which force is at work: rain falls to the ground? (a) magnetic force (b) friction (c) gravity (d) muscular force
30. 30.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 3 N, a carpet 4 N, sandpaper 7 N, a glass sheet 2 N. How many newtons more were needed on sandpaper than on a glass sheet?
31. 31.🪝 Fixed or movable pulley: which one hangs on the rope loop? (a) a movable pulley (b) a fixed pulley
32. 32.⚙️ A wedge is … (a) a bar on a pivot (b) a wheel on a rod (c) a rope on a wheel (d) two ramps back to back
33. 33.⚖️ A lever bar balances. The load is ? N at 10 cm from the fulcrum. The effort is 50 N at 60 cm from the fulcrum on the other side. What is the missing force in newtons?
34. 34.🪝 A pulley system lifts a 480 N load with an effort of 160 N. What is its mechanical advantage (MA)?
35. 35.⚖️ A lever bar balances. The load is 40 N at 10 cm from the fulcrum. The effort is 10 N at ? cm from the fulcrum on the other side. What is the missing distance in centimetres?
36. 36.🏋️ Pushing a crate 4 m took 320 J of work. What force was used, in newtons?
37. 37.💪 A box weighs 520 N. Taking 1 kg to weigh about 10 N, what is its mass in kilograms?
38. 38.True or false: a movable pulley rises with the load. (a) False (b) True
39. 39.True or false: kicking a football is a pull. (a) True (b) False
40. 40.🛞 Why are tyres made with deep treads? (a) to look nice (b) to go slower (c) to save rubber (d) to grip the road

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