Speed distance moved per unit of time -scalar quanity
The speed of an object is s=v*t
distance travelled,m=speed,m/s*time taken,s
The distance-time graph for any object that is:
- stationary, is a horizontal line
- moving at a constant speed, is a straight line that slopes upwardd
The gradient of a distance-time graph represents the objects speed
When an object is accelerating, you can find its speed at any given point by drawing a tangent to the graph and working out the gradient of the gradient
Typical everyday speeds in m/s
walking 1.5, running 3, cycling, 6, cyclist 6, cars 31, sound waves 330, light waves 3x108
Comments
No comments have yet been made