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# Linear Motion

This is a project on linear motion for intro physics class.
by

## noah graham

on 28 September 2010

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#### Transcript of Linear Motion

Linear Motion By Noah Graham Speed is the measure of how fast something is moving, or, the rate at which distance is covered. There are two typed of speed. Instantaneous speed and average speed. Instantaneous speed is the speed of an object at any instant. SPEED average speed is the total distance covered over the total time interval. if you travel 240 km in 4 hours, you would do 240/4 and get 60 km/hour as an average speed. an example of instantaneous speed is, say you
are moving at 50 km/hour, you could be traveling
at that speed for only a half hour, in which case you will not have gone the whole 50 km, but instead only 25 km. This is calculated by seeing that a half hour is 1 hour divided by 2, so you divide 50 by 2, and get 25 km. VELOCITY velocity is very similar to speed, but the difference is that velocity is the speed in a given direction. there is both constant velocity and changing velocity, constant velocity is when something is moving at a constant speed and in a constant direction. changing velocity is when either the speed changes but the direction doesn't, the direction changes but the speed doesn't, or they both change ACCELERATION the rate at which velocity changes is called acceleration acceleration is determined by the change in velocity divided by the time interval an object accelerates when speed or directions changes FREE FALL free fall is when an object is falling and the only force acting on it is the force of gravity during free fall, the object accelerates at when an object is in free fall, the acceleration is always 10m/s squared this is because 10 m/s squared is the acceleration due to gravity, when there is no air resistance in 10 m/s squared, the squared means that the object gains a speed of 10 m/s every second, so meters per second per second. the distance the object in free fall has fallen is determined by the equation d=1/2 gt squared, which stands for distance = 1/2 the acceleration due to gravity multiplied by the time it took the object to reach the point your trying to find squared Thank you for watching my presentaion on
Linear Motion
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