# PHYSICS P2 1.MOTION

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• Distance time graphs
• They show whether an object is stationary (Horizontal line)or whether it is moving at a constant speed which is a straight line that slopes upwards
• The Gradient of a line on a  distance time graph represents speed
• Speed
• With an object that is moving at a constant speed. I can calculate its speed by ...
• EQUATION- SPEED (m/s) =         distance  travelled (m) / time taken in seconds
• DISTANCE = SPEED/TIME
• Speed in action: TACHOGRAPHS IN CARS (CHECK DRIVERS DON'T DRIVE FOR TOO LONG.)
• PHYSICS P2 1.1 Motion
• Velocity
• DEFINITION: VELOCITY IS SPEED WITH A GIVEN DIRECTION
• When an object moving steadily around a circle it HAS a constant SPEED. However the direction of the motion changes  continuously  as it goes around so the velocity  is not constant.
• Two moving objects can have the same speed by different velocities, depending on the direction in which they are going.
• Acceleration
• Acceleration of an object is its change in velocity per second
• UNIT: METERS  PER SECOND SQUARED
• ANY OBJECT WITH CHANGING VELOCITY IS ACCELERATING.
• EQUATION:  ACCELERATION (M/S2)= Changing velocity per second  m/s  / time taken for change in seconds.
• For an object that  accelerates from an initial velocity (u) to a final velocity v) you have to do the following equation. ..
• EQUATION : ACCELERATION (A)= v-u / time.
• EQUATION:  ACCELERATION (M/S2)= Changing velocity per second  m/s  / time taken for change in seconds.
• For an object that  accelerates from an initial velocity (u) to a final velocity v) you have to do the following equation. ..
• EQUATION : ACCELERATION (A)= v-u / time.
• DECELERATION: NEGATIVE ACCELERATION FOR ANY SITUATION IS WHEN AN OBJECT SLOWS DOWN.
• More about VELOCITY TIME GRAPHS
• The gradient of a line on a velocity-time graph represents acceleration
• If a velocity-time graph is a horizontal line, the acceleration is ZERO.
• BRAKING
• More about VELOCITY TIME GRAPHS
• The gradient of a line on a velocity-time graph represents acceleration
• If a velocity-time graph is a horizontal line, the acceleration is ZERO.