Motion

Movement and Position

• Distance time graphs:
• Gradient = speed
• Straight line means constant
• Velocity (speed) time graphs:
• Gradient = acceleration
• Straight line means constant
• Area under the graph = distance
• Horizontal line is zero
• Distance is a scalar
• Displacement is vector
• Speed is scalar
• Velocity is vector

Diapositiva 2

• Acceleration:
• Rate of change of displacement is acceleration
• Formula is: change in velocity divided by time taken
• Change in velocity: v-u
• It is a vector quantity
• Acceleration is increase in speed
• Deceleration is decrease in speed
• Units - m/s^2
• Other formulas for this chapter:
• average speed= distance moved/time taken
• 2as= v^2 - u^2
• v = u + at
• s = ut + 1/2 at^2