Engineering Worksheet: Part 2 Test

Engineering lesson 16: Part 2 test: forces and machines · Set 248 · 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: oil on a squeaky hinge gives less friction. (a) True (b) False
2. 2.⚖️ Turning effect = force × … (a) mass of fulcrum (b) colour of bar (c) time taken (d) distance from fulcrum
3. 3.🔍 Which is the odd one out? (a) a round doorknob (b) a wheelchair ramp (c) a road up a hill (d) a playground slide
4. 4.⚖️ A lever bar balances. The load is ? N at 30 cm from the fulcrum. The effort is 270 N at 80 cm from the fulcrum on the other side. What is the missing force in newtons?
5. 5.🏋️ A force of 380 N did 3800 J of work. How many metres did the object move?
6. 6.⚙️ Most simple machines make work easier by letting us … (a) use a smaller force (b) stop all friction (c) switch off gravity (d) make new energy
7. 7.⚖️ A lever bar balances. The load is 40 N at ? cm from the fulcrum. The effort is 20 N at 20 cm from the fulcrum on the other side. What is the missing distance in centimetres?
8. 8.True or false: a flagpole rope wheel is a wheel and axle. (a) True (b) False
9. 9.⚖️ Which class of lever is a crowbar? (a) class 1 (b) class 3 (c) class 2
10. 10.⚖️ A seesaw balances. Asha (190 N) sits ? m from the pivot on one side; Zoya (570 N) sits 1 m from the pivot on the other side. What is the missing distance in metres?
11. 11.⚖️ Along a straight bar, measured from the left end, the effort is at 0 cm, the fulcrum at 40 cm and the load at 50 cm. Which class of lever is it? (a) class 2 (b) class 3 (c) class 1
12. 12.⚖️ Which class of lever is a bottle opener? (a) class 2 (b) class 1 (c) class 3
13. 13.💪 Which force is at work: squeezing a lemon? (a) magnetic force (b) friction (c) muscular force (d) gravity
14. 14.⚖️ A seesaw balances. Ravi (260 N) sits ? m from the pivot on one side; Zoya (260 N) sits 2 m from the pivot on the other side. What is the missing distance in metres?
15. 15.💪 A box weighs 450 N. Taking 1 kg to weigh about 10 N, what is its mass in kilograms?
16. 16.⚖️ A seesaw balances. Arjun (420 N) sits ? m from the pivot on one side; Meena (280 N) sits 3 m from the pivot on the other side. What is the missing distance in metres?
17. 17.💪 Is kicking a football a push or a pull? (a) a push (b) a pull
18. 18.Which of these is a screw? (a) the tip of a nail (b) a crane hook block (c) a screw jack (d) a seesaw
19. 19.⚖️ A lever balances when … (a) both weights are equal (b) the bar is short (c) turning effects match (d) the fulcrum moves
20. 20.🏋️ A longer ramp to the same height needs … (a) more effort (b) the same effort (c) no effort (d) less effort
21. 21.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 2 N, a glass sheet 6 N, a carpet 8 N, sandpaper 12 N. Which surface gave the most friction? (a) sandpaper (b) a carpet (c) ice (d) a glass sheet
22. 22.💪 Is pulling a cart a push or a pull? (a) a push (b) a pull
23. 23.🏋️ A 12 kg box is lifted straight up by 3 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
24. 24.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 5 N, a wooden plank 8 N, sandpaper 10 N, ice 1 N. Which surface gave the least friction? (a) a glass sheet (b) ice (c) a wooden plank (d) sandpaper
25. 25.🪝 A load of 210 N hangs from a pulley system in which 3 rope sections hold up the load. What effort is needed, in newtons? (ideal pulleys)
26. 26.⚖️ A seesaw balances. Kabir (? N) sits 4 m from the pivot on one side; Ravi (520 N) sits 3 m from the pivot on the other side. What is the missing weight in newtons?
27. 27.⚖️ Along a straight bar, measured from the left end, the effort is at 40 cm, the fulcrum at 70 cm and the load at 20 cm. Which class of lever is it? (a) class 2 (b) class 3 (c) class 1
28. 28.💪 Which force is at work: brakes stop a bicycle? (a) friction (b) gravity (c) muscular force (d) magnetic force
29. 29.🪝 A wheel and axle is a big wheel fixed to … (a) a sharp wedge (b) a loose rope (c) a smaller rod (axle) (d) a flat ramp
30. 30.🪝 A well winch has a handle (wheel) of radius 2 cm turning an axle of radius 1 cm. What is its mechanical advantage (MA)?
31. 31.🏋️ Pushing a crate 2 m took 840 J of work. What force was used, in newtons?
32. 32.⚖️ What is the pivot point of a lever called? (a) the load (b) the axle (c) the fulcrum (d) the effort
33. 33.Which of these is a screw? (a) a window blind cord (b) a road up a hill (c) a chisel (d) a nut and bolt
34. 34.🪝 A bucket weighing 480 N is lifted with a single fixed pulley at the top of a well. What effort is needed, in newtons? (ideal pulley, no friction)
35. 35.⚖️ Along a straight bar, measured from the left end, the effort is at 20 cm, the fulcrum at 60 cm and the load at 100 cm. Which class of lever is it? (a) class 1 (b) class 3 (c) class 2
36. 36.⚙️ Which simple machine is a truck loading ramp? (a) wedge (b) lever (c) wheel and axle (d) inclined plane
37. 37.🪝 A bucket weighing 370 N is lifted with a single fixed pulley at the top of a well. What effort is needed, in newtons? (ideal pulley, no friction)
38. 38.⚖️ On a seesaw, a heavier child should sit … (a) on the pivot (b) farther from the pivot (c) anywhere (d) closer to the pivot
39. 39.💪 Which force pulls everything towards the Earth? (a) friction (b) magnetism (c) wind (d) gravity
40. 40.💪 Which force is at work: lifting a school bag? (a) friction (b) gravity (c) muscular force (d) magnetic force

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