Engineering Worksheet: Part 2 Test

Engineering lesson 16: Part 2 test: forces and machines · Set 129 · 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 seesaw balances. Arjun (? N) sits 3 m from the pivot on one side; Asha (330 N) sits 3 m from the pivot on the other side. What is the missing weight in newtons?
2. 2.True or false: a bottle opener is a lever. (a) True (b) False
3. 3.⚖️ Which class of lever is a nutcracker? (a) class 2 (b) class 3 (c) class 1
4. 4.🪝 A wheel and axle is a big wheel fixed to … (a) a loose rope (b) a smaller rod (axle) (c) a sharp wedge (d) a flat ramp
5. 5.True or false: the tip of a nail is a pulley. (a) True (b) False
6. 6.⚙️ Which simple machine is a crowbar? (a) pulley (b) wedge (c) screw (d) lever
7. 7.⚖️ A seesaw balances. Asha (400 N) sits 1 m from the pivot on one side; Ravi (? N) sits 2 m from the pivot on the other side. What is the missing weight in newtons?
8. 8.True or false: kicking a football is a pull. (a) True (b) False
9. 9.⚙️ Which simple machine is a well-bucket rope wheel? (a) lever (b) pulley (c) screw (d) wheel and axle
10. 10.⚖️ A seesaw balances. Meena (320 N) sits 4 m from the pivot on one side; Zoya (640 N) sits ? m from the pivot on the other side. What is the missing distance in metres?
11. 11.⚖️ In a class 1 lever, what is in the middle? (a) the load (b) nothing (c) the effort (d) the fulcrum
12. 12.⚙️ Which simple machine is a well winch handle? (a) inclined plane (b) wheel and axle (c) wedge (d) lever
13. 13.💪 Which force is at work: rubbing hands warms them? (a) friction (b) gravity (c) magnetic force (d) muscular force
14. 14.⚖️ A seesaw balances. Asha (? N) sits 4 m from the pivot on one side; Ravi (440 N) sits 1 m from the pivot on the other side. What is the missing weight in newtons?
15. 15.True or false: pushing a trolley is a pull. (a) False (b) True
16. 16.🏋️ A smooth ramp is 12 m long and rises 3 m. What effort pushes a 400 N box up it, in newtons? (ideal ramp, no friction)
17. 17.🏋️ A force of 270 N pushes a cart 3 m along the floor. How much work is done, in joules?
18. 18.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 13 N, a glass sheet 4 N, a wooden plank 8 N, a carpet 10 N. Which surface gave the most friction? (a) a glass sheet (b) a carpet (c) a wooden plank (d) sandpaper
19. 19.🏋️ A 4 kg box is lifted straight up by 3 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
20. 20.🏋️ A machine lifts a load of 380 N when you push with 190 N. What is its mechanical advantage (MA)?
21. 21.🏋️ In which unit is work measured? (a) metre (m) (b) watt hour (c) newton (N) (d) joule (J)
22. 22.💪 Two children push a box to the right, one with 15 N and the other with 90 N. What is the net (total) force on the box, in newtons?
23. 23.⚖️ On a seesaw, a heavier child should sit … (a) on the pivot (b) farther from the pivot (c) closer to the pivot (d) anywhere
24. 24.💪 Which force is at work: lifting a school bag? (a) friction (b) muscular force (c) gravity (d) magnetic force
25. 25.True or false: a movable pulley needs effort = load. (a) False (b) True
26. 26.⚖️ A lever bar balances. The load is 40 N at ? cm from the fulcrum. The effort is 80 N at 20 cm from the fulcrum on the other side. What is the missing distance in centimetres?
27. 27.True or false: a pair of tweezers is a class 2 lever (load in the middle). (a) False (b) True
28. 28.💪 Which force is at work: a river flows downhill? (a) muscular force (b) magnetic force (c) friction (d) gravity
29. 29.🪝 A winch has a wheel of radius 8 cm and an axle of radius 4 cm. What effort on the wheel lifts a 120 N bucket on the axle, in newtons? (ideal)
30. 30.💪 A force is a … (a) kind of colour (b) unit of time (c) type of sound (d) push or a pull
31. 31.🏋️ A machine lifts a load of 850 N when you push with 170 N. What is its mechanical advantage (MA)?
32. 32.Which of these is a lever? (a) a bottle opener (b) a road up a hill (c) a water tap handle (d) a window blind cord
33. 33.True or false: a tyre with deep treads gives less friction. (a) True (b) False
34. 34.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 12 N, ice 3 N, a glass sheet 7 N, a wooden plank 10 N. How many newtons more were needed on a carpet than on ice?
35. 35.⚖️ A lever balances when … (a) the fulcrum moves (b) the bar is short (c) turning effects match (d) both weights are equal
36. 36.⚖️ Which class of lever is a beam balance? (a) class 2 (b) class 3 (c) class 1
37. 37.🏋️ A 2 kg box is lifted straight up by 5 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
38. 38.⚖️ Along a straight bar, measured from the left end, the effort is at 10 cm, the fulcrum at 0 cm and the load at 30 cm. Which class of lever is it? (a) class 2 (b) class 1 (c) class 3
39. 39.🪝 A bucket weighing 90 N is lifted with a single fixed pulley at the top of a well. What effort is needed, in newtons? (ideal pulley, no friction)
40. 40.🏋️ A force of 400 N did 400 J of work. How many metres did the object move?

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