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application base questions Chapter#4 class#9

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 All application base questions. ch#4 Application of  Resolution of forces A force can be resolved into two component forces graphically or with the use of trigonometry. Resolution of forces  allows us to analyze causes of motion separately in vertical, mediolateral, and anteroposterior directions . Application of Axis of rotation  Axis of rotation can be a difficult concept to grasp because it is an imaginary entity. In reference to human anatomy, axis of rotation is an imaginary line that projects through the pivot/rotation point in a joint (for example,  the axis of rotation for flexing and extending the arm projects through the elbow joint ). Application of CENTRE OF MASS Center of mass is  a useful reference point for calculations in mechanics that involve masses distributed in space, such as the linear and angular momentum of planetary bodies and rigid body dynamics . Application of CENTRE OF GRAVITY The Centre of gravity is a theoretical point in the...
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Physics practicals For Matric

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  4.0.0.  MICROMETER SCREW GAUGE : Micrometer Screw Gauge is used to measure smaller lenght or distance such as the diameter of a , more accurately. 4.1.0.  DIAGRAM OF MICROMETER SCREW GUAGE: MICROMETER SCREW GAUGE : Micrometer Screw Gauge is used to measure smaller lenght or distance such as the diameter of a , more accurately. 4.2.0  DIAGRAM OF MICROMETER SCREW GUAGE:   4.3.0.  .SCALES OF MICROMETRE SCREW GUAGE: A micrometer screw gauge has two scales : the main scale and the vernier scale. 4.3.1.  MAIN SCALE: The main scale of a micrometer is calibrated in mm. The calibrations of the main scale of micrometer screw gauge vary depending on the range of measurement that the micrometer screw gauges are meant to measure. I will not centre on the main scale. 4.3.2.  VERNIER SCALE: The vernier scale has 50 equal divisions. Each divisions is obtained by dividing 5 by 10. The vernier scale move a distance of 0.5mm along the main scale when it make 1 rev...
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ch#4 Turning Effect of Forces understanding base questions.

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  Turning Effect of Forces     📐📐📐📏📌📌 Q1. Can the nut of the axle of a bike be loosened with hand why we use a spanner for this purpose? Ans: No, we cannot loosen the nut of the axel of a bike. Normally we use a spanner because a spanner increases the turning effect of the force which easily loosened the nut of the axle of a bike. Q3. Women and children in the villages often carry pitchers with water on their heads how this is possible? Ans: Woman and children keep itself upright when carrying pitchers on their heads. The pitcher has a heavy semi-spherical base. When it is tilted, its center of mass rises. It returns to its upright position at which its center of mass is at its lowest. That is why women and children in the villages often carry pitchers with water on their heads.         Q4. With a little effort, we can learn to balance a stick vertically up on our fingertip how this is possible? Ans: To balance something, all you need to do is ma...
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Physics Ch#9

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   Ch#9  Short and long questions    9.2 Why metals are good conductors of heat? Metals are good conductors of heat because of the valence electrons freedom of motion within a metal. The free-moving electrons transmit heat quickly.       9.3 Explains why? 1.      a) A metal feels colder t touch than wood kept in a cold place? 2.      b) Land breeze blows from land towards sea? 3.      c) Double walled glass vessel is used in thermos flask? 4.      d) Deserts soon get hot during the day and soon get cold after sunset? Answers: 1.       A metal feels colder t touch than wood kept in a cold place? Metal is a thermal conductor and Wood is a thermal insulator. When you touch the metal the energy transfers rapidly to the metal, making it colder. When you touch the wood the energy transfers very slowly from your hand to the wood, this is why a metal f...
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