Engineering Worksheet: Part 2 Test

Engineering lesson 16: Part 2 test: forces and machines · Set 147 · 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.⚖️ Going along a lever from one end to the other, the order is: load, fulcrum, effort. Which class of lever is it? (a) class 3 (b) class 1 (c) class 2
2. 2.🛞 Is friction helpful or a problem here: gripping a cricket bat? (a) helpful (b) a problem
3. 3.⚙️ Most simple machines make work easier by letting us … (a) use a smaller force (b) make new energy (c) switch off gravity (d) stop all friction
4. 4.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 4 N, a glass sheet 7 N, a wooden plank 10 N, sandpaper 11 N. Which surface gave the most friction? (a) a glass sheet (b) sandpaper (c) ice (d) a wooden plank
5. 5.True or false: skating on ice gives less friction. (a) True (b) False
6. 6.⚖️ Along a straight bar, measured from the left end, the effort is at 30 cm, the fulcrum at 100 cm and the load at 60 cm. Which class of lever is it? (a) class 1 (b) class 3 (c) class 2
7. 7.💪 Which force is at work: rain falls to the ground? (a) magnetic force (b) muscular force (c) friction (d) gravity
8. 8.🛞 Rubbing your hands fast makes them … (a) cold (b) wet (c) magnetic (d) warm
9. 9.⚖️ A seesaw balances. Zoya (100 N) sits 4 m from the pivot on one side; Arjun (? N) sits 1 m from the pivot on the other side. What is the missing weight in newtons?
10. 10.⚖️ A seesaw balances. Kabir (? N) sits 3 m from the pivot on one side; Arjun (480 N) sits 1 m from the pivot on the other side. What is the missing weight in newtons?
11. 11.⚖️ On a seesaw, a heavier child should sit … (a) closer to the pivot (b) farther from the pivot (c) anywhere (d) on the pivot
12. 12.Which of these is a wedge? (a) a bottle opener (b) a crane hook block (c) a door stopper (d) a claw hammer on a nail
13. 13.True or false: a wheelbarrow is a class 3 lever (effort in the middle). (a) True (b) False
14. 14.💪 A box weighs 380 N. Taking 1 kg to weigh about 10 N, what is its mass in kilograms?
15. 15.🪝 Fixed or movable pulley: which one stays in one place? (a) a movable pulley (b) a fixed pulley
16. 16.⚖️ A seesaw balances. Kabir (160 N) sits 4 m from the pivot on one side; Ravi (? N) sits 1 m from the pivot on the other side. What is the missing weight in newtons?
17. 17.⚖️ A seesaw balances. Kabir (140 N) sits 1 m from the pivot on one side; Arjun (? N) sits 1 m from the pivot on the other side. What is the missing weight in newtons?
18. 18.💪 Is a tug of war a push or a pull? (a) a pull (b) a push
19. 19.💪 Is pushing a swing a push or a pull? (a) a push (b) a pull
20. 20.True or false: a fixed pulley makes you pull 2× rope. (a) False (b) True
21. 21.True or false: a tyre with deep treads gives less friction. (a) True (b) False
22. 22.⚖️ In a class 2 lever, what is in the middle? (a) the effort (b) the fulcrum (c) the axle (d) the load
23. 23.🏋️ A force of 190 N did 380 J of work. How many metres did the object move?
24. 24.🪝 Fixed or movable pulley: which one is on a flagpole top? (a) a fixed pulley (b) a movable pulley
25. 25.⚙️ Which simple machine is an axe blade? (a) wedge (b) lever (c) inclined plane (d) wheel and axle
26. 26.⚖️ Which class of lever is a pair of tweezers? (a) class 2 (b) class 3 (c) class 1
27. 27.🛞 More or less friction: chalk on a gym bar? (a) less friction (b) more friction
28. 28.🔍 Which is the odd one out? (a) a wet tiled floor (b) a wheel on ball bearings (c) a grippy rubber sole (d) a smooth steel slide
29. 29.⚙️ Which simple machine is a knife edge? (a) pulley (b) inclined plane (c) lever (d) wedge
30. 30.⚖️ 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?
31. 31.🏋️ A force of 10 N pushes a cart 2 m along the floor. How much work is done, in joules?
32. 32.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 7 N, sandpaper 11 N, ice 1 N, a wooden plank 4 N. How many newtons more were needed on sandpaper than on ice?
33. 33.⚖️ A lever balances when … (a) turning effects match (b) both weights are equal (c) the bar is short (d) the fulcrum moves
34. 34.🪝 A pulley system has 2 rope sections holding up the load. To lift the load by 10 m, how many metres of rope must you pull?
35. 35.Which of these is an inclined plane? (a) a bottle opener (b) a window blind cord (c) a playground slide (d) a screw jack
36. 36.⚖️ In a class 1 lever, what is in the middle? (a) the fulcrum (b) the load (c) the effort (d) nothing
37. 37.⚖️ Along a straight bar, measured from the left end, the effort is at 30 cm, the fulcrum at 80 cm and the load at 60 cm. Which class of lever is it? (a) class 2 (b) class 1 (c) class 3
38. 38.🏋️ A smooth ramp is 6 m long and rises 2 m. What effort pushes a 1050 N box up it, in newtons? (ideal ramp, no friction)
39. 39.🛞 More or less friction: powder on a carrom board? (a) more friction (b) less friction
40. 40.⚖️ Which class of lever is a fishing rod? (a) class 1 (b) class 3 (c) class 2

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