Engineering Worksheet: Part 2 Test

Engineering lesson 16: Part 2 test: forces and machines · Set 82 · 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.⚙️ Most simple machines make work easier by letting us … (a) use a smaller force (b) switch off gravity (c) make new energy (d) stop all friction
2. 2.⚖️ 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?
3. 3.Which of these is caused by muscular force? (a) a magnet picks up pins (b) squeezing a lemon (c) shoes grip the floor (d) rubbing hands warms them
4. 4.⚖️ A lever balances when … (a) the fulcrum moves (b) turning effects match (c) the bar is short (d) both weights are equal
5. 5.True or false: an axe blade is a wedge. (a) True (b) False
6. 6.💪 Which force is at work: rain falls to the ground? (a) friction (b) gravity (c) muscular force (d) magnetic force
7. 7.💪 Which force is at work: rubbing hands warms them? (a) friction (b) gravity (c) muscular force (d) magnetic force
8. 8.⚙️ Which simple machine is a bottle cap? (a) pulley (b) wedge (c) inclined plane (d) screw
9. 9.⚖️ Which class of lever is a pair of pliers? (a) class 1 (b) class 2 (c) class 3
10. 10.🏋️ A force of 340 N pushes a cart 7 m along the floor. How much work is done, in joules?
11. 11.⚖️ Which class of lever is a crowbar? (a) class 3 (b) class 1 (c) class 2
12. 12.🏋️ A force of 440 N pushes a cart 5 m along the floor. How much work is done, in joules?
13. 13.⚖️ A seesaw balances. Ravi (280 N) sits 2 m from the pivot on one side; Meena (280 N) sits ? m from the pivot on the other side. What is the missing distance in metres?
14. 14.⚖️ Going along a lever from one end to the other, the order is: load, effort, fulcrum. Which class of lever is it? (a) class 2 (b) class 1 (c) class 3
15. 15.🪝 A load of 560 N hangs from a pulley system in which 2 rope sections hold up the load. What effort is needed, in newtons? (ideal pulleys)
16. 16.⚖️ Along a straight bar, measured from the left end, the effort is at 50 cm, the fulcrum at 20 cm and the load at 30 cm. Which class of lever is it? (a) class 3 (b) class 2 (c) class 1
17. 17.🏋️ Pushing a crate 3 m took 1470 J of work. What force was used, in newtons?
18. 18.🪝 A bucket weighing 180 N is lifted with a single fixed pulley at the top of a well. What effort is needed, in newtons? (ideal pulley, no friction)
19. 19.💪 A box weighs 600 N. Taking 1 kg to weigh about 10 N, what is its mass in kilograms?
20. 20.🏋️ A force of 280 N did 1400 J of work. How many metres did the object move?
21. 21.⚖️ A seesaw balances. Kabir (340 N) sits 4 m from the pivot on one side; Ravi (680 N) sits ? m from the pivot on the other side. What is the missing distance in metres?
22. 22.⚖️ A lever bar balances. The load is 240 N at 40 cm from the fulcrum. The effort is ? N at 40 cm from the fulcrum on the other side. What is the missing force in newtons?
23. 23.🏋️ Mechanical advantage (MA) = … (a) load ÷ effort (b) load × effort (c) load + effort (d) effort ÷ load
24. 24.True or false: the tip of a nail is a wedge. (a) True (b) False
25. 25.⚖️ In a class 2 lever, what is in the middle? (a) the effort (b) the axle (c) the load (d) the fulcrum
26. 26.🪝 A wheel and axle is a big wheel fixed to … (a) a loose rope (b) a sharp wedge (c) a smaller rod (axle) (d) a flat ramp
27. 27.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 9 N, ice 4 N, a glass sheet 7 N, a wooden plank 8 N. Which surface gave the most friction? (a) sandpaper (b) a glass sheet (c) a wooden plank (d) ice
28. 28.⚖️ A seesaw balances. Asha (? N) sits 4 m from the pivot on one side; Kabir (600 N) sits 4 m from the pivot on the other side. What is the missing weight in newtons?
29. 29.True or false: pushing a swing is a push. (a) True (b) False
30. 30.⚖️ Along a straight bar, measured from the left end, the effort is at 50 cm, the fulcrum at 10 cm and the load at 0 cm. Which class of lever is it? (a) class 1 (b) class 2 (c) class 3
31. 31.True or false: a fixed pulley makes you pull 2× rope. (a) False (b) True
32. 32.🏋️ A longer ramp to the same height needs … (a) less effort (b) no effort (c) more effort (d) the same effort
33. 33.💪 Which force is at work: brakes stop a bicycle? (a) gravity (b) magnetic force (c) friction (d) muscular force
34. 34.🏋️ A 9 kg box is lifted straight up by 5 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
35. 35.🛞 Is friction helpful or a problem here: walking without slipping? (a) helpful (b) a problem
36. 36.⚖️ In a class 1 lever, what is in the middle? (a) the load (b) the effort (c) nothing (d) the fulcrum
37. 37.True or false: plucking a mango is a push. (a) False (b) True
38. 38.⚖️ On a seesaw, a heavier child should sit … (a) anywhere (b) on the pivot (c) closer to the pivot (d) farther from the pivot
39. 39.🏋️ Pushing a crate 7 m took 1330 J of work. What force was used, in newtons?
40. 40.⚖️ A lever bar balances. The load is 140 N at 30 cm from the fulcrum. The effort is 210 N at ? cm from the fulcrum on the other side. What is the missing distance in centimetres?

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