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P9: MOTION - Coggle Diagram
P9: MOTION
Speed
Speed is how quickly an object is changing direction
The faster the speed the more distance an object can travel in a given time
Distance = speed * time
If an object is going at 20 m/s for 1 minute, it will have travelled 60 * 20 = 1200 m
Speed is a scalar quantity
To calculate average speed, take the total distance and divide by the total time
Velocity
Velocity is speed in a given direction
An object could be going 50 m/s north or 20 mph east
Velocity is a Vector quantity
Velocity can be negative
Acceleration
Acceleration is how quickly an object is changing its velocity
An object's acceleration is calculated by the change in velocity / time
If an object started at rest and then accelerated to a speed of 5 m/s in 2 seconds, how fast is its acceleration?
acceleration = 5/2 = 2.5 m/s squared
Distance-Time Graphs
https://dryuc24b85zbr.cloudfront.net/tes/resources/6061038/image?width=500&height=500&version=1597162985832
The flat lines show a stop and diagonal lines show a constant speed. Curved lines show acceleration.
Velocity-Time Graphs
https://i.pinimg.com/600x315/b1/d8/44/b1d84433c1ea46ed4d9adc942f212b2a.jpg
Flat lines show a constant speed and the diagonal lines show acceleration. Curved lines show increasing or decreasing acceleration and to find the acceleration of a given point on a curve, you take the tangent and find the acceleration of that. The area underneath a velocity time graph is the distance travelled
Scalar and Vector Quantities
Scalar Quantities do not have a direction associated with them, they only have a magnitude. These include: speed, mass, distance, energy, power, density, temperature
Vector Quantities have magnitude in a given direction. These include: acceleration, velocity, displacement, force and weight.