Engineering Worksheet: Part 2 Test

Engineering lesson 16: Part 2 test: forces and machines · Set 639 · 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: hitting a cricket ball is a pull. (a) False (b) True
2. 2.🪝 A well winch has a handle (wheel) of radius 15 cm turning an axle of radius 5 cm. What is its mechanical advantage (MA)?
3. 3.🏋️ A force of 30 N pushes a cart 10 m along the floor. How much work is done, in joules?
4. 4.⚙️ Which simple machine is a nutcracker? (a) wedge (b) inclined plane (c) lever (d) pulley
5. 5.🏋️ A smooth ramp is 6 m long and rises 1 m. What effort pushes a 2100 N box up it, in newtons? (ideal ramp, no friction)
6. 6.⚖️ Which class of lever is your forearm? (a) class 2 (b) class 3 (c) class 1
7. 7.True or false: a fixed pulley hangs on the rope loop. (a) True (b) False
8. 8.⚙️ Which simple machine is a flagpole rope wheel? (a) inclined plane (b) pulley (c) screw (d) wedge
9. 9.🪝 A wheel and axle is a big wheel fixed to … (a) a smaller rod (axle) (b) a flat ramp (c) a sharp wedge (d) a loose rope
10. 10.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 6 N, sandpaper 8 N, ice 1 N, a glass sheet 2 N. How many newtons more were needed on sandpaper than on ice?
11. 11.🪝 A bucket weighing 490 N is lifted with a single fixed pulley at the top of a well. What effort is needed, in newtons? (ideal pulley, no friction)
12. 12.⚖️ On a seesaw, a heavier child should sit … (a) anywhere (b) closer to the pivot (c) farther from the pivot (d) on the pivot
13. 13.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 8 N, a wooden plank 10 N, sandpaper 12 N, ice 4 N. How many newtons more were needed on sandpaper than on ice?
14. 14.⚖️ In a class 1 lever, what is in the middle? (a) nothing (b) the effort (c) the fulcrum (d) the load
15. 15.🛞 Friction acts … (a) with the motion (b) only upwards (c) only on ice (d) against the motion
16. 16.💪 Is pulling up your socks a push or a pull? (a) a pull (b) a push
17. 17.⚖️ A lever bar balances. The load is 560 N at 10 cm from the fulcrum. The effort is 70 N at ? cm from the fulcrum on the other side. What is the missing distance in centimetres?
18. 18.🏋️ Can a simple machine reduce the work done? (a) yes, always (b) only on Mondays (c) no, work stays the same (d) yes, by half
19. 19.⚖️ Along a straight bar, measured from the left end, the effort is at 10 cm, the fulcrum at 60 cm and the load at 50 cm. Which class of lever is it? (a) class 1 (b) class 3 (c) class 2
20. 20.🛞 More or less friction: a rough doormat? (a) more friction (b) less friction
21. 21.⚖️ A seesaw balances. Asha (160 N) sits ? m from the pivot on one side; Ravi (640 N) sits 1 m from the pivot on the other side. What is the missing distance in metres?
22. 22.🪝 A bucket weighing 470 N is lifted with a single fixed pulley at the top of a well. What effort is needed, in newtons? (ideal pulley, no friction)
23. 23.🏋️ An 18 kg box is lifted straight up by 2 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
24. 24.🏋️ A force of 110 N did 880 J of work. How many metres did the object move?
25. 25.🔍 Which is the odd one out? (a) a smooth steel slide (b) powder on a carrom board (c) a wheel on ball bearings (d) chalk on a gym bar
26. 26.True or false: a screw jack is a screw. (a) False (b) True
27. 27.🏋️ A force of 310 N pushes a cart 6 m along the floor. How much work is done, in joules?
28. 28.🔍 Which is the odd one out? (a) a smooth steel slide (b) a grippy rubber sole (c) oil on a squeaky hinge (d) a wheel on ball bearings
29. 29.🛞 More or less friction: skating on ice? (a) more friction (b) less friction
30. 30.⚙️ Which simple machine is a bottle cap? (a) inclined plane (b) pulley (c) screw (d) lever
31. 31.🏋️ Mechanical advantage (MA) = … (a) load + effort (b) effort ÷ load (c) load × effort (d) load ÷ effort
32. 32.🏋️ A machine lifts a load of 800 N when you push with 160 N. What is its mechanical advantage (MA)?
33. 33.🔍 Which is the odd one out? (a) skating on ice (b) a rough doormat (c) a smooth steel slide (d) a wheel on ball bearings
34. 34.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 1 N, a glass sheet 2 N, a carpet 3 N, sandpaper 4 N. Which surface gave the least friction? (a) a carpet (b) sandpaper (c) ice (d) a glass sheet
35. 35.🪝 A bucket weighing 160 N is lifted with a single fixed pulley at the top of a well. What effort is needed, in newtons? (ideal pulley, no friction)
36. 36.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 6 N, sandpaper 8 N, ice 1 N, a wooden plank 5 N. Which surface gave the most friction? (a) ice (b) a wooden plank (c) a carpet (d) sandpaper
37. 37.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 4 N, a glass sheet 5 N, a wooden plank 6 N, a carpet 10 N. How many newtons more were needed on a carpet than on ice?
38. 38.🏋️ A force of 210 N did 1470 J of work. How many metres did the object move?
39. 39.⚖️ A lever balances when … (a) turning effects match (b) both weights are equal (c) the bar is short (d) the fulcrum moves
40. 40.True or false: a wood screw is a wedge. (a) False (b) True

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