motion P9
- Created by: millie walk
- Created on: 02-03-20 15:38
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- motion
- speed & distance-time graphs
- speed = distance/time
- speed m/s
- distance m
- time s
- distance time graphs
- shows distance (y axis) of an object from a starting point against the time taken (x axis)
- gradient of line = speed
- object stationary - gradient = 0
- constant speed: straight line sloping upwards
- steeper the gradient = greater the speed
- speed = distance/time
- velocity & acceleration
- displacement of an object
- distance travelled in a given time
- velocity
- an objects speed in a given direction
- scalar has magnitude only
- speed & distance both scalar
- vector has magnitude and direction
- velocity and displacement both vector quantities
- if an object changes direction then it changes velocity even if speed stays the same
- if velocity of a body changes, it accelerates
- if an object changes direction then it changes velocity even if speed stays the same
- velocity and displacement both vector quantities
- acceleration = (final velocity - initial velocity) / time
- acceleration = m/s^2
- velocity = m/s
- time = s
- deceleration
- a negative acceleration - the object slowing down
- displacement of an object
- velocity-time graphs
- use a motion sensor linked to a computer to record how velocity of an object changes
- velocity = y axis, time = x axis
- gradient = acceleration
- if gradient = 0, object is at a constant speed
- steeper the granient, greaer the acceleration
- gradient = negative the object is decelerating
- the area under the line represents the distance travelled in a given direction (or displacement)
- analysing motion graphs
- objects speed = gradient of it's distance time graph
- objects acceleration = gradient of it's velocity time graph
- final speed^2 = initial speed^2 + (2 x acceleration x distance)
- speed = m/s
- acceleration = m/s^2
- distance = m
- speed & distance-time graphs
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