Speed Vs Velocity What is Speed Speed is

What is Speed? Speed is simply how quickly distance is covered. Average Speed is

Example: The average speed of a bullet train that travels 600 km in 2

Converting to metres per second (m/s) Convert km’s into m’s by multiplying it by

Distance and Time If we are looking for distance or time, we need to

Example: The distance covered in 3. 5 hours by a sloth travelling at and

Velocity How is Velocity different to speed? Instead of measuring how quickly distance is

Example: A blue car travels from point A, 30 km’s to the east and

Example: However, a red car travels from point A, and drives 50 km on

Blue Car Average Speed Average Velocity Red Car

Changing Speed Acceleration: How quickly the speed changes. Average acceleration =

For example: A greyhound racing at 43 km/h, that increased its speed to the

For example 2: A greyhound racing at the average race speed of 63 km/h,

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Speed Vs Velocity

What is Speed? Speed is simply how quickly distance is covered. Average Speed is measured using the following formula: Average speed = This is expressed by: v=

Example: The average speed of a bullet train that travels 600 km in 2 hours is: v= v= So: v = 300 km/h So the train is travelling at an average speed of 300 kilometres per hour. But how can this be expressed in metres per second

Converting to metres per second (m/s) Convert km’s into m’s by multiplying it by 1000. Using: v = v= 600, 000 7200 Convert hours into seconds by multiplying it by 3600. So: v = 83. 33 m/s Why? 60 seconds to a minute and 60 minutes to an hour, so 60 x 60 = 3600

Distance and Time If we are looking for distance or time, we need to rearrange the formula to suit.

Example: The distance covered in 3. 5 hours by a sloth travelling at and average speed of 0. 24 km/h is: Distance = speed x time So: Distance =. 24 km/h x 3. 5 h So: Distance = 0. 84 km YAY

Velocity How is Velocity different to speed? Instead of measuring how quickly distance is covered, Velocity measures the rate of change in position. When measuring velocity direction is also considered.

Example: A blue car travels from point A, 30 km’s to the east and then 40 km’s to the north, arriving at point B in 2 hours, its speed is as follows: 40 km’s North B A v= So: 30 km’s East v = 35 km/h

Example: However, a red car travels from point A, and drives 50 km on a direct route arriving at point B in 2 hours, its speed is as follows: NE ’s km 50 Using: v = Notice the “D” rather than “d”. Refers to Displacement A v= So: v = 25 km/h 30 km’s East 40 km’s North B

Blue Car Average Speed Average Velocity Red Car

Changing Speed Acceleration: How quickly the speed changes. Average acceleration =

For example: A greyhound racing at 43 km/h, that increased its speed to the average race speed of 63 km/h in 2. 5 seconds has an average acceleration of: a = 8. 0 km/h per second

For example 2: A greyhound racing at the average race speed of 63 km/h, that decreased its speed to 3 km/h in 3 seconds has an average deceleration of: a = -20 km/h per second