Summary Chapter 18 Velocity Acceleration

###### - Average Speed = Distance travelled ( m ) : time taken ( s )

- Acceleration = change in Velocity ( m/s ) : time taken for the change ( s )

# The acceleration is shown by the slope or gradient of the velocity-time graph

# The distance travelled is shown by the area under the velocity-time graph

# The speed is shown by the slope or gradient of the distance-time graph

# S = Distance travelled in metres

U = Initial velocity in metres per second

V = Final velocity in metres per second

A = Acceleration in metres per second squared

T = Time taken in seconds

- V = U + AT

S = (U+V):2 x T

S = UT + 0.5AT²

V² = U² + 2AS

S = ( U + ( U + AT ) : 2 ) T

S = ( U + V ) : 2 x ( V – U ) : A

# Acceleration due to gravity = 9.8 metres per second ( 10 metres per second )

# At a terminal velocity, force of gravity & force of air resistance are balanced

# Vector quantity > A quantity in which size & direction are important

# Vector quantities > Force , displacement, velocity and acceleration

# When a car is reversing, it has negative velocity

- = A formula

# = A rule of thumb, facts to learn

© Eva de Schipper, B2a