1 - FORCES AND MOTION 

Distance-time and velocity-time graphs - 

Distance-time graphs - 

• Gradient = speed 
• Flat sections = stopped 
• Steeper = faster 
• Downhill = other direction towards starting point 
• Curves = acceleration/deceleration 
• Steepening curve (increasing gradient) = speeding up
• Levelling off curve (decreasing gradient) = slowing down

eg: 
Speed = gradient = vertical/horizontal 
                = 2/1 = 2m/s  

Velocity-time graphs - 

• Gradient = acceleration 
• Flat sections = steady speed 
• Steeper = greater acceleration/deceleration
• Uphill (/) = acceleration 
• Downhill (\) = deceleration 
• Area under any section of graph = distance travelled in that time interval
• Curve = changing acceleration 

 eg: 
Acceleration = gradient = vertical/horizontal 
                    = 2/1 = 2 m/s^2 (squared) 
Speed = value from velocity axis 
Distance travelled = area under graph