Engineering Worksheet: Part 2 Test

Engineering lesson 16: Part 2 test: forces and machines · Set 606 · 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 crowbar is a class 2 lever (load in the middle). (a) False (b) True
2. 2.🏋️ A force of 60 N pushes a cart 6 m along the floor. How much work is done, in joules?
3. 3.⚖️ Which class of lever is a crowbar? (a) class 3 (b) class 1 (c) class 2
4. 4.True or false: a pair of kitchen tongs is a class 1 lever (fulcrum in the middle). (a) True (b) False
5. 5.🛞 More or less friction: powder on a carrom board? (a) more friction (b) less friction
6. 6.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 12 N, ice 3 N, a glass sheet 4 N, a wooden plank 8 N. Which surface gave the most friction? (a) ice (b) sandpaper (c) a wooden plank (d) a glass sheet
7. 7.🪝 A load of 100 N hangs from a pulley system in which 2 rope sections hold up the load. What effort is needed, in newtons? (ideal pulleys)
8. 8.🏋️ A force of 180 N pushes a cart 10 m along the floor. How much work is done, in joules?
9. 9.🏋️ A machine lifts a load of 840 N when you push with 140 N. What is its mechanical advantage (MA)?
10. 10.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 3 N, a wooden plank 6 N, a carpet 8 N, sandpaper 11 N. Which surface gave the least friction? (a) a wooden plank (b) sandpaper (c) ice (d) a carpet
11. 11.⚖️ A seesaw balances. Zoya (? N) sits 1 m from the pivot on one side; Kabir (120 N) sits 4 m from the pivot on the other side. What is the missing weight in newtons?
12. 12.True or false: a fixed pulley hangs on the rope loop. (a) True (b) False
13. 13.🏋️ 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?
14. 14.⚙️ A screw is really … (a) a tiny pulley (b) a ramp wrapped round (c) a bent lever (d) a kind of wheel
15. 15.🏋️ A force of 240 N did 240 J of work. How many metres did the object move?
16. 16.🪝 Fixed or movable pulley: which one rises with the load? (a) a fixed pulley (b) a movable pulley
17. 17.True or false: a fixed pulley makes you pull 2× rope. (a) True (b) False
18. 18.Which of these is a lever? (a) a road up a hill (b) a truck loading ramp (c) a seesaw (d) a round doorknob
19. 19.Which of these is a pulley? (a) a well winch handle (b) a steering wheel (c) a knife edge (d) a flagpole rope wheel
20. 20.🛞 More or less friction: skating on ice? (a) more friction (b) less friction
21. 21.True or false: a movable pulley halves the effort. (a) False (b) True
22. 22.⚖️ Which class of lever is a pair of tweezers? (a) class 2 (b) class 1 (c) class 3
23. 23.⚖️ Along a straight bar, measured from the left end, the effort is at 40 cm, the fulcrum at 70 cm and the load at 0 cm. Which class of lever is it? (a) class 2 (b) class 1 (c) class 3
24. 24.⚖️ Which class of lever is a bottle opener? (a) class 2 (b) class 3 (c) class 1
25. 25.💪 Is plucking a mango a push or a pull? (a) a pull (b) a push
26. 26.True or false: opening a drawer is a push. (a) True (b) False
27. 27.⚙️ Most simple machines make work easier by letting us … (a) make new energy (b) stop all friction (c) use a smaller force (d) switch off gravity
28. 28.⚖️ A seesaw balances. Zoya (720 N) sits ? m from the pivot on one side; Arjun (180 N) sits 4 m from the pivot on the other side. What is the missing distance in metres?
29. 29.🏋️ A force of 340 N pushes a cart 3 m along the floor. How much work is done, in joules?
30. 30.🪝 A winch has a wheel of radius 4 cm and an axle of radius 2 cm. What effort on the wheel lifts a 320 N bucket on the axle, in newtons? (ideal)
31. 31.⚖️ Along a straight bar, measured from the left end, the effort is at 40 cm, the fulcrum at 30 cm and the load at 80 cm. Which class of lever is it? (a) class 3 (b) class 1 (c) class 2
32. 32.⚙️ Which simple machine is a well winch handle? (a) lever (b) inclined plane (c) wheel and axle (d) screw
33. 33.🪝 A winch has a wheel of radius 20 cm and an axle of radius 5 cm. What effort on the wheel lifts a 720 N bucket on the axle, in newtons? (ideal)
34. 34.Which of these is caused by magnetic force? (a) shoes grip the floor (b) a magnet picks up pins (c) rain falls to the ground (d) a river flows downhill
35. 35.True or false: pressing a doorbell is a pull. (a) True (b) False
36. 36.🏋️ A machine lifts a load of 570 N when you push with 190 N. What is its mechanical advantage (MA)?
37. 37.💪 Is hitting a cricket ball a push or a pull? (a) a pull (b) a push
38. 38.True or false: closing a drawer is a push. (a) False (b) True
39. 39.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 2 N, a glass sheet 4 N, a carpet 6 N, sandpaper 8 N. Which surface gave the most friction? (a) a carpet (b) a glass sheet (c) sandpaper (d) ice
40. 40.True or false: a crane hook block is a lever. (a) True (b) False

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