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Published byLinette Robinson Modified over 4 years ago

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1Both Mr Rabbit and Mr Tortoise took the same round trip, but Mr Rabbit slept & returned later.

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Comment on their argument. Me, as I spent less time on the trip. No, I travelled longer distance every minute. Who runs faster?

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Speed Speed is a measure of how fast something is moving. It is the rate at which a distance is covered Units of speed could be: km/h, m/s, mi/h, ft/s In science we use units of m/s for speed s = d/t

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Instantaneous Speed Instantaneous speed is speed at any instant in time. A speedometer measures speed in ‘real time’ (the instantaneous speed).

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Average Speed Average speed is the average of all instantaneous speeds; found simply by a total distance/total time ratio The average speed of a trip:

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A convenient way to show the motion of an object is by using a graph that plots the distance the object has traveled against time.

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Velocity Velocity is a speed in a specific direction. A change in speed or direction results in a change in velocity. Velocity is an example of a vector. A vector is a quantity that has both size and direction. (Speed is not a vector because it is a measure of how fast or slow an object moves) It is possible to have two object moving at the same speed but different velocities.

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Velocity versus Speed Speed refers to how quickly an object moves Velocity is defined as speed in a given direction or rate of change of position (displacement over time). v = x/t Velocity refers to both the speed and direction of motion of an object. Negative velocity means the object is moving in the opposite direction Motion at constant velocity means that both the speed and direction of an object do not change. In a car, we can change the velocity three ways: gas pedal to speed up, brake to slow down or steering wheel to change direction

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