Engineering Worksheet: Part 2 Test

Engineering lesson 16: Part 2 test: forces and machines · Set 610 · 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.True or false: a fishing rod is a class 3 lever (effort in the middle). (a) False (b) True
2. 2.⚖️ Along a straight bar, measured from the left end, the effort is at 10 cm, the fulcrum at 60 cm and the load at 30 cm. Which class of lever is it? (a) class 1 (b) class 3 (c) class 2
3. 3.⚖️ A lever balances when … (a) both weights are equal (b) the fulcrum moves (c) the bar is short (d) turning effects match
4. 4.⚙️ Which simple machine is a round doorknob? (a) wedge (b) wheel and axle (c) inclined plane (d) lever
5. 5.⚙️ A wedge is … (a) a rope on a wheel (b) a bar on a pivot (c) two ramps back to back (d) a wheel on a rod
6. 6.💪 Which force is at work: lifting a school bag? (a) friction (b) gravity (c) muscular force (d) magnetic force
7. 7.Which of these is a wheel and axle? (a) a crowbar (b) an axe blade (c) a water tap handle (d) the tip of a nail
8. 8.💪 In a tug of war, one team pulls left with 100 N and the other pulls right with 70 N. What is the size of the net force, in newtons?
9. 9.🏋️ Pushing a crate 4 m took 1520 J of work. What force was used, in newtons?
10. 10.🏋️ A machine lifts a load of 700 N when you push with 140 N. What is its mechanical advantage (MA)?
11. 11.⚖️ A seesaw balances. Asha (520 N) sits ? m from the pivot on one side; Kabir (130 N) sits 4 m from the pivot on the other side. What is the missing distance in metres?
12. 12.⚖️ A lever bar balances. The load is ? N at 30 cm from the fulcrum. The effort is 240 N at 90 cm from the fulcrum on the other side. What is the missing force in newtons?
13. 13.🪝 A well winch has a handle (wheel) of radius 12 cm turning an axle of radius 2 cm. What is its mechanical advantage (MA)?
14. 14.🛞 More or less friction: a box pushed on carpet? (a) less friction (b) more friction
15. 15.⚖️ A lever bar balances. The load is 560 N at 20 cm from the fulcrum. The effort is ? N at 70 cm from the fulcrum on the other side. What is the missing force in newtons?
16. 16.💪 Is pulling up your socks a push or a pull? (a) a pull (b) a push
17. 17.🏋️ A 10 kg box is lifted straight up by 4 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
18. 18.⚖️ Along a straight bar, measured from the left end, the effort is at 30 cm, the fulcrum at 60 cm and the load at 0 cm. Which class of lever is it? (a) class 1 (b) class 3 (c) class 2
19. 19.🪝 A well winch has a handle (wheel) of radius 9 cm turning an axle of radius 3 cm. What is its mechanical advantage (MA)?
20. 20.True or false: a wood screw is a screw. (a) True (b) False
21. 21.🛞 More or less friction: powder on a carrom board? (a) more friction (b) less friction
22. 22.🏋️ Pushing a crate 6 m took 600 J of work. What force was used, in newtons?
23. 23.⚙️ How many simple machines are there in the usual list? (a) 10 (b) 12 (c) 3 (d) 6
24. 24.🏋️ A force of 430 N pushes a cart 2 m along the floor. How much work is done, in joules?
25. 25.🛞 More or less friction: a tyre with deep treads? (a) more friction (b) less friction
26. 26.🏋️ A machine lifts a load of 240 N when you push with 40 N. What is its mechanical advantage (MA)?
27. 27.💪 A box weighs 150 N. Taking 1 kg to weigh about 10 N, what is its mass in kilograms?
28. 28.💪 A box weighs 360 N. Taking 1 kg to weigh about 10 N, what is its mass in kilograms?
29. 29.⚙️ Which simple machine is a well winch handle? (a) wheel and axle (b) lever (c) screw (d) inclined plane
30. 30.⚙️ Most simple machines make work easier by letting us … (a) stop all friction (b) switch off gravity (c) make new energy (d) use a smaller force
31. 31.⚖️ Along a straight bar, measured from the left end, the effort is at 20 cm, the fulcrum at 60 cm and the load at 90 cm. Which class of lever is it? (a) class 2 (b) class 3 (c) class 1
32. 32.🏋️ A smooth ramp is 6 m long and rises 2 m. What effort pushes a 600 N box up it, in newtons? (ideal ramp, no friction)
33. 33.⚖️ A seesaw balances. Ravi (600 N) sits ? m from the pivot on one side; Asha (800 N) sits 3 m from the pivot on the other side. What is the missing distance in metres?
34. 34.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 10 N, a glass sheet 4 N, a wooden plank 7 N, a carpet 9 N. Which surface gave the least friction? (a) a carpet (b) sandpaper (c) a wooden plank (d) a glass sheet
35. 35.💪 In a tug of war, one team pulls right with 35 N and the other pulls left with 15 N. What is the size of the net force, in newtons?
36. 36.⚖️ Which class of lever is a pair of scissors? (a) class 2 (b) class 1 (c) class 3
37. 37.True or false: a fixed pulley halves the effort. (a) False (b) True
38. 38.⚖️ On a seesaw, a heavier child should sit … (a) anywhere (b) farther from the pivot (c) on the pivot (d) closer to the pivot
39. 39.⚙️ Which simple machine is a bottle cap? (a) lever (b) screw (c) pulley (d) inclined plane
40. 40.Which of these is caused by friction? (a) a rolling ball slows (b) a river flows downhill (c) an apple falls down (d) lifting a school bag

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