Time: 20:00
Important one liner (Time and speed)
- Speed is the distance covered per unit time.
- Distance equals speed multiplied by time.
- Time equals distance divided by speed.
- Average speed is total distance over total time.
- Instantaneous speed is the speed at a given moment.
- Relative speed in opposite directions adds both speeds.
- Relative speed in same direction subtracts speeds.
- Uniform speed means constant speed.
- Non-uniform speed varies over time.
- SI unit of speed is meters per second (m/s).
- SI unit of time is second (s).
- SI unit of distance is meter (m).
- To convert m/s to km/h multiply by 3.6.
- To convert km/h to m/s divide by 3.6.
- Zero speed means no movement.
- Higher speed covers more distance in same time.
- Lower speed takes more time for same distance.
- Speed-time graph shows speed variation over time.
- Distance-time graph shows how far an object travels over time.
- Acceleration is rate of change of velocity over time.
- Deceleration is negative acceleration.
- In constant acceleration, speed changes linearly with time.
- Average velocity considers direction; speed does not.
- Graph area under speed-time curve gives distance.
- Speed of light in vacuum is approximately 3×10^8 m/s.
- Speed limits are legal maximum speeds on roads.
- Time dilation occurs at relativistic speeds.
- Terminal velocity is the constant maximum speed in fluid.
- Angular speed measures rotation per unit time.
- Linear speed relates to angular speed by radius.
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