Physics: Explaining Motions

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• P4: Explaining Motions
• Speed:
• Speed (m/s) = Distance (m) /Time (s)
• Instantaneous Speed: is a particular speed in one moment in time.
• Speed-Time Graphs:
• A visual way of showing how an objects speed changes over a period of time.
• The steeper  line, the greater the size of the  accelaration.
• A horizontal line means that the speed of the object is at a constant speed.
• A straight line going up shows accelaration.
• A straight line going down shows decelaration.
• Velocity:
• The speed of an object in a certain direction.
• The degree of slope of  a line.
• The gradient of a speed time graph is accelaration.
• Distance-Time Graphs
• A visual way of showing the time taken for a journey, and the distance travelled.
• The steeper the gradient of the line, the faster the speed.
• A horizontal line suggests that the vehicle is stationary.
• A straighter diagonal line means that the vehicle is travelling at a constant speed.
• The gradient of the line is equal to the speed.
• How far an object travels, using the equation:
• Accelaration = Changeof velocity (metres per second)/ time for the change

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