Motion
Motion- the change in the position of an object with respect to time and its reference point Motion is RELATIVE Reference point/ frame of reference: a point/object that is not moving
Reference Point and Relative Motion Example: -If you are sitting on a train looking at your neighbor, neither of you seem to be moving -If you look out the window at people standing on the side, they seem to be moving backwards -If the people on the side are looking at you, you seem to be moving forward
Describing Motion Distance- the length between two points – Units: meters, kilometers, etc. Time
Speed Speed- is the distance traveled per unit of time – Units: m/s, km/s, etc. S= speed D = distance t= time Solve for other variables : D= s*t t= D/s Formula: S = D/t
Average Speed The total distance divided by the total time
Instantaneous Speed The speed at any given instant
You must always show your work and units!! ALWAYS METRICS No answer is complete without units!
Let’s try one! Calculate the speed of a dog running through a field if he is covering 23.7 meters in 54 seconds. Given:Formula: Find: Work Space:
If a cross country runner covers a distance of 347 meters in 134 seconds what is her speed? Given:Formula: Find: Work Space:
Velocity Velocity- The speed and direction an object is moving in Units: speed and a direction Example: The car’s velocity is 60 km/hr EAST
Try This: Calculate the velocity of a dog running north through a field if he is covering 23.7 meters in 54 seconds. Given:Formula: Find: Work Space: