Engineering Worksheet: Part 2 Test

Engineering lesson 16: Part 2 test: forces and machines · Set 278 · 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.💪 Is pulling a cart a push or a pull? (a) a pull (b) a push
2. 2.💪 Two children push a box to the right, one with 30 N and the other with 40 N. What is the net (total) force on the box, in newtons?
3. 3.True or false: a box pushed on carpet gives more friction. (a) True (b) False
4. 4.True or false: plucking a mango is a push. (a) False (b) True
5. 5.🏋️ In which unit is work measured? (a) watt hour (b) joule (J) (c) newton (N) (d) metre (m)
6. 6.🛞 More or less friction: a tyre with deep treads? (a) less friction (b) more friction
7. 7.⚖️ A lever bar balances. The load is 70 N at ? cm from the fulcrum. The effort is 40 N at 70 cm from the fulcrum on the other side. What is the missing distance in centimetres?
8. 8.🏋️ Pushing a crate 5 m took 2100 J of work. What force was used, in newtons?
9. 9.🛞 Is friction helpful or a problem here: machine parts heating up? (a) helpful (b) a problem
10. 10.💪 Which force pulls everything towards the Earth? (a) gravity (b) magnetism (c) wind (d) friction
11. 11.True or false: a crowbar is a class 1 lever (fulcrum in the middle). (a) True (b) False
12. 12.🔍 Which is the odd one out? (a) a flagpole rope wheel (b) a well-bucket rope wheel (c) a wheelchair ramp (d) a window blind cord
13. 13.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 6 N, a carpet 8 N, sandpaper 9 N, a glass sheet 4 N. Which surface gave the most friction? (a) a glass sheet (b) a wooden plank (c) a carpet (d) sandpaper
14. 14.🏋️ A machine lifts a load of 1140 N when you push with 190 N. What is its mechanical advantage (MA)?
15. 15.🪝 A well winch has a handle (wheel) of radius 32 cm turning an axle of radius 4 cm. What is its mechanical advantage (MA)?
16. 16.🏋️ A smooth ramp is 10 m long and rises 2 m. What effort pushes a 1750 N box up it, in newtons? (ideal ramp, no friction)
17. 17.True or false: pushing a swing is a pull. (a) False (b) True
18. 18.🪝 A pulley system has 4 rope sections holding up the load. To lift the load by 2 m, how many metres of rope must you pull?
19. 19.🪝 Fixed or movable pulley: which one is on a flagpole top? (a) a movable pulley (b) a fixed pulley
20. 20.🏋️ Mechanical advantage (MA) = … (a) load ÷ effort (b) load + effort (c) effort ÷ load (d) load × effort
21. 21.⚖️ Along a straight bar, measured from the left end, the effort is at 30 cm, the fulcrum at 0 cm and the load at 70 cm. Which class of lever is it? (a) class 1 (b) class 2 (c) class 3
22. 22.🏋️ A force of 110 N pushes a cart 1 m along the floor. How much work is done, in joules?
23. 23.⚖️ On a seesaw, a heavier child should sit … (a) closer to the pivot (b) farther from the pivot (c) on the pivot (d) anywhere
24. 24.🏋️ A force of 330 N did 330 J of work. How many metres did the object move?
25. 25.Which of these is a screw? (a) a jar lid (b) a flagpole rope wheel (c) a truck loading ramp (d) a bottle opener
26. 26.True or false: a pair of scissors is a class 2 lever (load in the middle). (a) True (b) False
27. 27.🪝 A pulley system lifts a 60 N load with an effort of 30 N. What is its mechanical advantage (MA)?
28. 28.⚙️ A wedge is … (a) a bar on a pivot (b) two ramps back to back (c) a wheel on a rod (d) a rope on a wheel
29. 29.⚙️ Which simple machine is a seesaw? (a) inclined plane (b) wheel and axle (c) pulley (d) lever
30. 30.🛞 More or less friction: a grippy rubber sole? (a) more friction (b) less friction
31. 31.True or false: a beam balance is a class 3 lever (effort in the middle). (a) False (b) True
32. 32.🛞 Is friction helpful or a problem here: writing with a pencil? (a) a problem (b) helpful
33. 33.⚖️ Along a straight bar, measured from the left end, the effort is at 50 cm, the fulcrum at 10 cm and the load at 90 cm. Which class of lever is it? (a) class 3 (b) class 2 (c) class 1
34. 34.True or false: a pair of kitchen tongs is a class 1 lever (fulcrum in the middle). (a) False (b) True
35. 35.⚖️ A seesaw balances. Ravi (300 N) sits 1 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?
36. 36.💪 Two equal forces push on a box from opposite sides. They are … (a) unbalanced (b) balanced (c) doubled (d) gravity
37. 37.⚖️ A lever bar balances. The load is 90 N at 30 cm from the fulcrum. The effort is ? N at 30 cm from the fulcrum on the other side. What is the missing force in newtons?
38. 38.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 6 N, sandpaper 7 N, ice 3 N, a wooden plank 5 N. Which surface gave the most friction? (a) a wooden plank (b) sandpaper (c) ice (d) a carpet
39. 39.🏋️ A smooth ramp is 8 m long and rises 2 m. What effort pushes a 400 N box up it, in newtons? (ideal ramp, no friction)
40. 40.🪝 A load of 880 N hangs from a pulley system in which 4 rope sections hold up the load. What effort is needed, in newtons? (ideal pulleys)

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